A device and system for on-site forest harvesting survey

Abstract

The application discloses a kind of field forest felling surveying device and system, it is related to forestry survey technical field.The device includes processor, display screen, touch module, positioning module, camera and external laser range finder;Touch module is integrated in display screen;Display screen displays map;Select one from a variety of felling block vector acquisition mode by touch module;When selecting GPS point drawing, make portable mobile terminal move along felling block boundary, positioning module real-time acquisition positioning data, while camera shoots felling block field image;Processor displays real-time positioning data on map, forms felling block vector surface;External laser range finder measures felling block boundary distance and felling block inner forest space structure parameter;Processor determines felling block range parameter and felling block volume according to above information, and generates felling application form and survey report on line, and can also print on site.The application can effectively improve the efficiency and accuracy of field forest felling surveying.

Description

Technical Field

[0001] This application relates to the field of forestry survey technology, and in particular to a field timber harvesting and requisition survey device and system. Background Technology

[0002] In timber harvesting management, the investigation and collection of on-site logging block information is a crucial step, directly impacting the efficiency of logging approvals and the quality of forest resource management. Traditional survey methods rely heavily on paper records and manual drawing, resulting in low data collection efficiency, easy loss of paper records, information errors, and synchronization delays. Existing survey tools are limited in function and lack integrated mobile devices to flexibly collect logging block vector information (such as multiple drawing methods), bind attributes, manage projects, and correlate sample plot data. Furthermore, they struggle to generate standardized logging reports in real time, failing to meet the demands of efficient and accurate forestry management.

[0003] Therefore, there is an urgent need for an integrated field survey device and system to achieve a unified solution for rapid collection, dynamic management, real-time uploading, automatic report generation, and on-site printing of logging block information, thereby improving the level of intelligence in forest logging and requisition surveys. Summary of the Invention

[0004] The purpose of this application is to provide an on-site timber harvesting and requisition survey device and system, which can effectively improve the efficiency and accuracy of on-site timber harvesting and requisition surveys.

[0005] To achieve the above objectives, this application provides the following solution: In the first aspect, this application provides a field timber harvesting and requisition survey device, including: a processor, a display screen, a touch module, a positioning module, a camera, and an external laser rangefinder.

[0006] The touch module is integrated into the display screen; the display screen is used to load and display the map from the processor; the touch module allows selection of one of several logging block vector acquisition methods; the multiple logging block vector acquisition methods include at least GPS point plotting; When GPS points are selected for plotting, the portable mobile terminal moves along the boundary of the logging block. The positioning module acquires the positioning data of the portable mobile terminal in real time and transmits it to the processor in real time. At the same time, the processor controls the camera to capture images of the logging site. The processor displays the real-time positioning data on the map and forms a vector surface of the logging block. An external laser rangefinder is used to measure the distance to the boundary of the felling block and the spatial structure parameters of the trees within the felling block; the processor is used to determine the range parameters of the felling block based on the distance to the boundary of the felling block and the spatial structure parameters of the trees within the felling block, combined with the vector surface of the felling block, and to determine the volume of the felling block based on the spatial structure parameters of the trees within the felling block and the range parameters of the felling block. The processor is used to generate logging application forms and survey reports online based on images of the logging site, logging range parameters, and logging volume, and to print the logging application forms and survey reports on-site via Bluetooth connection to a printer.

[0007] Secondly, this application provides a field timber harvesting and requisition survey system, which is applied to the above-mentioned field timber harvesting and requisition survey device. The field timber harvesting and requisition survey system includes: a multi-source map service engine module, a positioning and navigation module, a data acquisition module, a data management module, a report generation module, and a report printing module.

[0008] The multi-source map service engine module is used to load and switch between multi-source maps; The positioning and navigation module is used to receive positioning data and display the positioning data and local weather information in real time. The data acquisition module is used to acquire the log vector surface and log attributes under the selected log vector acquisition method; The data management module is used to support the creation of new logging block projects, manage logging blocks and manage sample plots; a sample plot is a sampling unit within a logging block. The report generation module is used to generate logging application forms and survey reports online based on images of the logging site, logging area parameters, and logging volume. The report printing module is used to print logging application forms and survey reports on-site via Bluetooth connection to a printer.

[0009] According to the specific embodiments provided in this application, this application has the following technical effects: This application provides a field timber harvesting and requisition survey device and system that supports multiple log block vector acquisition methods and offers flexible acquisition options. By incorporating a processor, display screen, touch module, positioning module, camera, and external laser rangefinder, the portable mobile terminal integrates positioning, ranging, and shooting functions, enabling a complete "acquisition-management-upload-report-printing" process, effectively improving the efficiency and accuracy of field timber harvesting and requisition surveys. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of a field timber harvesting and requisition survey device provided in an embodiment of this application. Detailed Implementation

[0012] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0013] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0014] In one exemplary embodiment, such as Figure 1 As shown, a field timber harvesting and requisition survey device is provided, comprising: a processor, a display screen, a touch module, a positioning module, a camera, and an external laser rangefinder.

[0015] The touch module is integrated into the display screen; the display screen is used to load and display the map from the processor; the touch module allows selection of one of several logging block vector acquisition methods; the multiple logging block vector acquisition methods include at least GPS point mapping.

[0016] When GPS points are selected for plotting, the portable mobile terminal moves along the boundary of the logging block. The positioning module acquires the positioning data of the portable mobile terminal in real time and transmits it to the processor in real time. At the same time, the processor controls the camera to capture images of the logging block site. The processor displays the real-time positioning data on the map and forms a vector surface of the logging block.

[0017] An external laser rangefinder is used to measure the distance to the logging block boundary and the spatial structure parameters of the trees within the logging block; the processor is used to determine the logging block range parameters based on the logging block boundary distance and the spatial structure parameters of the trees within the logging block, combined with the logging block vector surface, and to determine the logging block volume based on the spatial structure parameters of the trees within the logging block and the logging block range parameters.

[0018] The processor is used to generate logging application forms and survey reports online based on images of the logging site, logging range parameters, and logging volume, and to print the logging application forms and survey reports on-site via Bluetooth connection to a printer.

[0019] As an alternative implementation, the portable mobile terminal is a ruggedized portable mobile terminal that is waterproof and shockproof, and equipped with a high-precision GPS module.

[0020] As an optional implementation, the device further includes: a memory; the memory is connected to the processor; the memory is used to store system programs, map data, user data, the location data, and collected images of the logging site.

[0021] As an optional implementation, the device further includes: a communication module; the processor connects to a backend server via the communication module; the processor transmits data to be uploaded to the communication module, and sends the data to be uploaded to the backend server via the communication module; the processor also downloads content from the backend server via the communication module and drives the display screen to display the content.

[0022] As an optional implementation, the device further includes a power module for supplying power to the processor, display screen, touch module, positioning module, camera, and external laser rangefinder.

[0023] Reference Figure 1 The structure of the on-site forest logging and land occupation survey device will be described in more detail.

[0024] The entire device is connected via a processor as the central hub, directly connecting to the memory, display screen, touch module, positioning module, communication module, camera, and external laser rangefinder through dedicated interfaces or buses. All data transmission and control commands are scheduled by the processor, ensuring that all modules work together to complete functions such as positioning, data acquisition, storage, and transmission for forest logging and land acquisition surveys. (Note: The power module (not shown in the diagram) provides power to all hardware, employing lithium batteries and intelligent power management to ensure long-term operation in the field.) The processor and memory are connected via a data bus (such as a DDR bus or a memory bus) and a control bus. The memory (such as DDR RAM or flash memory) is used to store system programs, map data, and user-collected data. The processor reads the system program (startup device) and map base map (for display) from the memory via the bus, and writes the collected positioning data, image data, etc., into the memory for storage.

[0025] Processor-display connection: via a display interface (such as MIPI-DSI).

[0026] The processor converts the content to be displayed (map interface, data form, operation menu, etc.) into image signals, transmits them to the display screen through the display interface, and drives the screen display; at the same time, the processor can send control signals (such as adjusting screen brightness and switching display modes) through the interface.

[0027] Connection between the processor and the touch module: The connection is via a touch interface (such as I2C, USB, or a dedicated touch bus). After the touch module (integrated in the touch display) detects a user touch operation (such as clicking a menu or entering data), it transmits information such as touch coordinates and operation type to the processor through the interface. Upon receiving this information, the processor parses the operation intent (such as initiating positioning or uploading data) and executes the corresponding logic (such as controlling the positioning module to start or driving the communication module to work).

[0028] Connection between the processor and the positioning module: via serial port (UART), I2C, or SPI interface. The positioning module (GPS / RTK / BeiDou) acquires positioning data such as latitude, longitude, and altitude in real time and transmits it to the processor through the interface. After receiving the data, the processor can calculate the location by combining it with map data (for display on the screen), or associate it with logging block or sample plot information (stored in memory), or upload it to the backend through the communication module.

[0029] Processor and communication module connection: connected via high-speed interface (such as PCIe, USB 3.0 or dedicated wireless communication bus).

[0030] The processor transmits the data that needs to be uploaded (block information, sample plot data, and field images) to the communication module through the interface, driving it to send the data to the backend server via 4G / 5G / WiFi. At the same time, the processor receives the content downloaded from the server by the communication module (project list and base map update package) through the interface, and instructs the memory to store it or drives the display screen to display it.

[0031] Processor-camera connection: Connected via a camera interface (such as MIPI-CSI). After the processor sends a start command, the camera captures images of the site (such as the actual situation of the logging block) and transmits the image data (RAW or compressed format) to the processor via the interface; the processor processes the image data (such as compression, adding positioning watermarks), stores it in the instruction memory, or uploads it via the communication module.

[0032] Connection between the processor and the external laser rangefinder: via an external interface (such as Bluetooth, USB Type-C, or a dedicated serial port).

[0033] After measuring the distance, the laser rangefinder transmits the data (such as the distance to the boundary of the felled block and the spacing between trees) to the processor via an interface. After receiving the data, the processor calculates parameters such as area and length (such as the range of the felled block) by combining the coordinate information from the positioning module, or stores / uploads the data after associating it with the sample plot data.

[0034] Indirect interaction between modules (collaboration layer): There is no direct connection between modules. All data interaction is achieved through the processor. For example, images captured by the camera need to be transmitted to the processor first and then stored in the processor's instruction memory; the coordinate data of the positioning module and the distance data of the laser rangefinder need to be calculated by the processor before the logging block boundary information can be generated and displayed on the screen; historical data in the memory (such as old logging block information) needs to be read by the processor before it can be uploaded to the backend through the communication module.

[0035] The details of processor data interaction are shown in Table 1.

[0036] Table 1 Processor Data Interaction Details

[0037] As an optional implementation method, various methods for acquiring logging block vector data include: GPS point mapping, point-based mapping, and freehand drawing. Point-based mapping refers to marking three or more boundary points using a touch module, and automatically generating the logging block surface based on the marked boundary points. Freehand drawing refers to directly drawing the logging block boundary on the display screen using a touch module to generate the logging block vector surface. GPS point mapping: Based on real-time coordinates from a positioning module, the logging block vector surface is automatically generated when the mobile terminal is in use.

[0038] As an optional implementation, the logical operations in the processor include: 1. Location data processing Input: Raw NMEA-0183 protocol data sent by the positioning module (such as GGA statements containing latitude, longitude, elevation, time, positioning status, etc.).

[0039] Processing procedure: Data parsing: Extract fields such as latitude and longitude, elevation, number of satellites, and precision factor (HDOP / VDOP) from the original string.

[0040] Coordinate transformation: Convert the WGS84 coordinate system to the CGCS2000 Gaussian projection for easier map display and distance calculation.

[0041] Accuracy verification: Determine the current positioning accuracy based on the number of satellites and the accuracy factor. If it is lower than the set threshold (e.g., HDOP>2), a warning message will be triggered.

[0042] Track recording: Records continuous positioning points at 1-second intervals to form a movement trajectory.

[0043] Output: Structured positioning data (time, plane coordinates X / Y, elevation Z, accuracy level).

[0044] 2. Spatial Data Generation (Taking the Drawing of Logging Block Boundaries as an Example) Input: Boundary points marked by the user via touchscreen (coordinates obtained through positioning or ranging fusion); closed polygons formed by continuous movement trajectories.

[0045] Processing procedure: Polygon Closure: Automatically connects the first and last points to form a closed region.

[0046] Area calculation: Using Gaussian projection plane coordinates, calculate the area of ​​the polygon according to the following formula: Let the vertex coordinates be , … Then the area ,in , .

[0047] Topology check: Ensure that boundary lines do not intersect (using ray casting to determine this).

[0048] Automatic unit conversion (from square meters to mu: 1 mu ≈ 666.67 square meters).

[0049] Attribute association: Bind the area value to attributes such as block number and tree type.

[0050] Output: Spatial data and area values ​​of the block polygon.

[0051] 3. Image geotagging Input: JPEG image captured by the camera; coordinate data sent in real time by the positioning module.

[0052] Processing procedure: Time synchronization: Records the precise timestamp of the moment the photo was taken.

[0053] Coordinate matching: Find the location data within 1 second before and after the time of taking the photo, and take the average value as the photo coordinates.

[0054] EXIF write: Write latitude, longitude, elevation, and orientation into the EXIF ​​information of the image (such as GPSLatitude / GPSLongitude tags).

[0055] Thumbnail generation: Creates a low-resolution copy for quick previewing.

[0056] Output: A JPEG file with geographic information.

[0057] 4. User interaction processing (taking sample plot marking as an example) Input: Screen coordinates sent by the touch module ( x , y ).

[0058] Processing procedure: Coordinate transformation: Convert screen coordinates to map coordinates (requires map projection inverse operation).

[0059] Event distribution: Click: Select block / sample plot; Long press: a property form will pop up; Two-finger zoom: Adjust the map scale; Form validation: Check the range of input values ​​such as diameter at breast height (DBH) and tree height (e.g., DBH > 0 and < 300cm).

[0060] Output: Update map display / store user input data.

[0061] 5. Data storage and retrieval Input: Spatial data, attribute data, image file.

[0062] Processing procedure: Spatial index construction: Use R-tree indexes to accelerate range queries (such as logging blocks within an administrative region).

[0063] Data is stored in blocks: directories are organized by project ID, block data is stored as GeoJSON, and images are stored as separate files.

[0064] Transaction management: Ensures the atomicity of critical operations (such as data upload).

[0065] Output: Local database updated.

[0066] 6. Communication Control Input: The block data package to be uploaded.

[0067] Processing procedure: Data compression: JSON data is compressed using the LZ77 algorithm.

[0068] Resume interrupted transmission: Records the MD5 value of the sent data block and retransmits from the last block after a network interruption.

[0069] Encrypted transmission: Sensitive fields (such as forest tenure owner information) are encrypted using AES-256.

[0070] Output: Network packet sending / receiving status.

[0071] 7. Business logic operations (accumulation volume estimation) Input: Diameter at breast height (D) and tree height (H) of each tree in the sample plot.

[0072] Processing procedure: Calculation of single timber volume: ; Tree species The sum of the volumes of all individual trees within the area. Tree species Breast diameter; Tree species The trees are tall; , , Tree species Specific parameters (coefficients and exponents).

[0073] The binary volume parameters differ among different tree species. The volume formula should be selected based on the tree species, such as for Chinese fir: The binary volumetric parameters of common tree species are shown in Table 2.

[0074] Table 2 Binary Volume Parameters of Common Tree Species

[0075] Sample plot volume: ) 10000; Block stock volume: ; ; Output: Total volume of felled blocks (cubic meters).

[0076] In the above formula, This represents the average volume per hectare across multiple sample plots within the logging block. For sample plots Per hectare of stock, This refers to the number of sample plots. This represents the total volume of felled blocks. Area of ​​the felled block; This refers to the volume per hectare of multiple sample plots within the logging block. M The number of tree species within the felled block. Tree species The sum of the volumes of all individual timbers within the area, in meters. 3 , Tree species The area is expressed in square meters; 10000 is the conversion factor for 1 hectare = 10000 square meters.

[0077] The above logical operations are processed in parallel by multiple threads in the processor: High-priority threads: real-time processing of positioning data (millisecond-level response); medium-priority threads: user interaction, ranging fusion; low-priority threads: data synchronization, image processing.

[0078] For example, the on-site timber harvesting and requisition survey device of this application is a portable tablet terminal that complies with Android 8.0 and above. Its hardware includes a processor (such as Qualcomm Snapdragon series), memory (4GB RAM + 64GB ROM), a 10.1-inch touch screen, a GPS / BeiDou dual-mode positioning module, a 4G communication module, a 13-megapixel camera and a 5000mAh lithium battery.

[0079] Compared with the prior art, this application has the following advantages: Device structure: The back of the terminal is equipped with a retractable surveying bracket, along with physical shortcut keys (such as screen capture key and GPS on / off key).

[0080] High degree of integration: The device adopts a rugged portable mobile terminal that integrates positioning, communication, ranging, and shooting functions. Together with the system modules, it realizes the entire process of "collection-management-upload-report-printing", which is suitable for field operations.

[0081] Flexible data collection methods: Supports multiple logging block vector data collection methods (point drawing, GPS point drawing, freehand drawing) and local import. When collecting logging blocks, it automatically associates meteorological data and administrative division unit data to adapt to different terrains and survey needs.

[0082] Data management standards: Logging block and sample plot data are managed through project-based management, supporting topology editing, dynamic updates and precise queries to ensure data consistency; a two-level confirmation mechanism is used for logging block deletion to prevent accidental operations.

[0083] Significant efficiency improvements: Real-time data upload, online report generation, and on-site report printing reduce manual data entry and post-processing costs, helping to improve the efficiency of logging and land acquisition approvals.

[0084] Based on the same inventive concept, this application also provides a field timber harvesting and requisition survey system applied to the above-mentioned field timber harvesting and requisition survey device. The solution provided by this system is similar to the solution described in the above method. Therefore, the specific limitations of one or more field timber harvesting and requisition survey system embodiments provided below can be found in the limitations of the field timber harvesting and requisition survey device above, and will not be repeated here.

[0085] In one exemplary embodiment, a field timber harvesting and requisition survey system is provided, comprising: a multi-source map service engine module, a positioning and navigation module, a data acquisition module, a data management module, a report generation module, and a report printing module.

[0086] The multi-source map service engine module loads and switches between multi-source maps. The positioning and navigation module receives positioning data and displays it in real time, along with local weather information. The data acquisition module collects logging block vector surfaces and attributes using the selected logging block vector acquisition method. The data management module supports the creation of new logging block projects and manages logging blocks and sample plots; a sample plot is a sampling unit within a logging block. The report generation module generates logging application forms and survey reports online based on logging block site images, logging block extent parameters, and logging block volume. The report printing module connects to a printer via Bluetooth to print logging application forms and survey reports on-site.

[0087] As an optional implementation, the on-site timber harvesting and requisition survey system also includes a data transmission module. This module uploads real-time collected logging block information, sample plot data, and image files to the backend server. The data transmission module also downloads the project list, updated base map, and system configuration information from the backend server.

[0088] As an optional implementation, the on-site timber harvesting and requisition survey system also includes a user interaction module. This module is used for user login, logout, and account switching, providing a graphical user interface that displays maps, data forms, and system prompts, and supports password retrieval.

[0089] The following section provides a more detailed explanation of each module in the system.

[0090] (1) User interaction module Implement user login (username + password + verification code), logout, and account switching functions; It provides a graphical user interface that displays maps, data forms, and system prompts. Password recovery function is supported.

[0091] (2) Multi-source map service engine module Load and switch between image map, vector map and terrain shading map. The default display shows image map, place name address, administrative division and road network data. Control the display / hide of place names and addresses, road networks, and forest and grassland map layers (the forest and grassland map displays forest patches and small patch boundaries when zoomed to level 14). It integrates screen capture functionality, supporting screenshots of the current map display area and saving them to storage.

[0092] (3) Positioning and navigation module It receives data from the positioning module and displays the user's current GPS coordinates and local weather information in real time. Supports administrative division navigation, allowing users to navigate from the provincial level down to the county level to a specific administrative division. Implement map roaming (drag and pan) and zooming (gesture or selection) functions.

[0093] (4) Data acquisition module Block vector acquisition supports three methods: Point sampling and drawing: Collect 3 or more points through the touch module to automatically generate the block surface; GPS point mapping: Based on the real-time coordinates of the positioning module, the block vector surface is automatically generated when the mobile terminal is in use; Freehand drawing: Directly draw block boundaries via touchscreen to generate vector surfaces; Block attribute collection: Provides an attribute input form, including information such as block number, volume, and output, and supports on-site images captured by associated cameras; Local import: Supports importing block vector information via shp files, which can then be edited and incorporated into system management.

[0094] (5) Data Management Module Project Management: Supports creating new projects (entering project name and type) and maintaining project layers (adding and editing layers); Block management includes block query (search by block number or browse a list), vector update (drag and drop nodes, trim edges, cut lines, cut surfaces), attribute update (modify form information), and deletion functions; Sample plot management: Enables the binding of sample plots and logging blocks (through the logging block attribute panel or the sample collection function), updating, deleting, and querying sample plot information.

[0095] (6) Data transmission module Real-time upload: Upload the collected block information (vector + attributes), sample plot data and image files to the backend server; Data synchronization: Download the backend project list, update the map base map and system configuration information.

[0096] (7) Report generation module Based on the collected data of logging blocks and sample plots, logging application forms and survey reports are generated online; Supports previewing report content on the display screen.

[0097] (8) Report printing module Based on the online-generated logging application form and survey report, on-site printing is performed via Bluetooth connection to a printer.

[0098] The system runs on a portable mobile terminal, and the collaborative workflow of each module is as follows: (1) Login and initialization Users log in to the system by entering their username, password, and verification code through the user interaction module. The system automatically loads the map service module (which displays image maps, place names and addresses, and road networks by default). The positioning module starts and obtains the current location, displaying GPS coordinates and weather information on the screen.

[0099] (2) Project creation and block collection Users can create new projects through the data management module (such as "XX Forest Farm Logging Survey Project"). Enter the map interface, click the "Collect" button to activate the data collection module, select the "GPS point drawing" method, move the mobile terminal to the boundary of the logging block, the positioning module obtains the coordinates in real time and generates a vector surface, after completion, enter information such as logging block number and volume through the attribute form, call the camera to take on-site photos and upload them; If you need to import historical data, select the local shapefile using the "File Import" function, edit it, and then incorporate it into the current project.

[0100] (3) Block update and sample plot binding When an error is found in the boundary of the felling block, select the target felling block in the data management module, use the "falling block vector" editing function to divide the felling block using the "line cut" method, and save the updated data; Using the "Plot Management" function, fill in the plot information (such as plot number and tree species composition) in the block attribute panel to complete the binding of the plot and the block.

[0101] (4) Report generation and data upload: After the survey is completed, the logging application form is automatically generated by calling the data of the logging blocks and sample plots under the current project through the report generation module; The data transmission module synchronizes project data, logging information, and reports to the backend server for management to view and approve.

[0102] In this embodiment, the system effectively improves the efficiency and accuracy of on-site forest logging and requisition surveys through diversified data collection methods, standardized data management, and real-time interactive functions, meeting the actual needs of forestry management departments.

[0103] This application combines hardware devices and software systems to achieve efficient collection, management, updating, report generation, and on-site printing of logging block information, thereby improving the convenience and data accuracy of forest logging and requisition surveys and solving problems such as low efficiency and data synchronization lag in traditional survey methods.

[0104] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0105] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the device and its core ideas. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A device for on-site investigation of timber harvesting and requisition, characterized in that, include: Portable mobile terminals; The portable mobile terminal integrates positioning, ranging, and shooting functions, and performs the entire process of data collection, management, uploading, reporting, and printing. The portable mobile terminal includes: a processor, a display screen, a touch module, a positioning module, a camera, and an external laser rangefinder; The touch module is integrated into the display screen; the display screen is used to load and display the map from the processor; the touch module allows selection of one of several logging block vector acquisition methods; the multiple logging block vector acquisition methods include at least GPS point plotting; When GPS points are selected for plotting, the portable mobile terminal moves along the boundary of the logging block. The positioning module acquires the positioning data of the portable mobile terminal in real time and transmits it to the processor in real time. At the same time, the processor controls the camera to capture images of the logging site. The processor displays the real-time positioning data on the map and forms a vector surface of the logging block. An external laser rangefinder is used to measure the distance to the boundary of the felling block and the spatial structure parameters of the trees within the felling block; the processor is used to determine the range parameters of the felling block based on the distance to the boundary of the felling block and the spatial structure parameters of the trees within the felling block, combined with the vector surface of the felling block, and to determine the volume of the felling block based on the spatial structure parameters of the trees within the felling block and the range parameters of the felling block. The formula for calculating the volume of felled blocks is: ； ； ） 10000； In the formula, This represents the average volume per hectare across multiple sample plots within the logging block. For sample plots Per hectare of stock, This refers to the number of sample plots. This represents the total volume of felled blocks. Area of ​​the felled block; This refers to the volume per hectare of multiple sample plots within the logging block. M The number of tree species within the felled block. Tree species The sum of the volumes of all individual trees within the area. Tree species The area; The processor is used to generate logging application forms and survey reports online based on images of the logging site, logging range parameters, and logging volume, and to print the logging application forms and survey reports on-site via Bluetooth connection to a printer.

2. The on-site timber harvesting and requisition survey device according to claim 1, characterized in that, Also includes: Memory; The memory is connected to the processor; The memory is used to store system programs, map data, user data, the location data, and collected images of the logging site.

3. The on-site timber harvesting and requisition survey device according to claim 1, characterized in that, Also includes: Communication module; The processor connects to the backend server via a communication module; The processor transmits the data to be uploaded to the communication module, which then sends the data to the backend server. The processor also downloads content from the backend server via the communication module and drives the display screen.

4. The on-site timber harvesting and requisition survey device according to claim 1, characterized in that, Also includes: Power module; The power module supplies power to the processor, display, touch module, positioning module, camera, and external laser rangefinder.

5. The on-site timber harvesting and requisition survey device according to claim 1, characterized in that, Multiple methods for acquiring log vector data also include: point-based drawing and freehand drawing; Point drawing refers to marking three or more boundary points using a touch module, and automatically generating a block surface based on the marked boundary points; Freehand drawing refers to drawing the boundaries of logging blocks directly on the display screen using a touch module to generate a vector surface of the logging block.

6. The on-site timber harvesting and requisition survey device according to claim 1, characterized in that, When the processor controls the camera to capture images of the logging site, it records the timestamp of the moment the image is taken. After the image of the logging site is transmitted to the processor, the processor is used to find the location data within 1 second before and after the time of the photo, take the average value of the location data as the coordinates of the logging site image, and write the timestamp of the time of the photo and the coordinates of the logging site image into the EXIF ​​information of the logging site image to obtain a JPEG file with geographic information. The processor is also used to create a copy of the image of the logging site; the copy has a lower resolution than the image of the logging site.

7. A system for investigating on-site logging and land requisition, characterized in that, The on-site timber harvesting and land occupation survey system is applied to the on-site timber harvesting and land occupation survey device according to any one of claims 1-6. The on-site timber harvesting and land occupation survey system includes: a multi-source map service engine module, a positioning and navigation module, a data acquisition module, a data management module, a report generation module, and a report printing module. The multi-source map service engine module is used to load and switch between multi-source maps; The positioning and navigation module is used to receive positioning data and display the positioning data and local weather information in real time. The data acquisition module is used to acquire the log vector surface and log attributes under the selected log vector acquisition method; The data management module is used to support the creation of new logging block projects, manage logging blocks and manage sample plots; a sample plot is a sampling unit within a logging block. The report generation module is used to generate logging application forms and survey reports online based on images of the logging site, logging range parameters, and logging volume. The report printing module is used to print logging application forms and survey reports on-site via Bluetooth connection to a printer.

8. The on-site timber harvesting and requisition survey system according to claim 7, characterized in that, The on-site forest logging and requisition survey system also includes: a data transmission module; The data transmission module is used to upload real-time collected information on logging blocks, sample plot data, and image files to the backend server; The data transmission module is also used to download the project list, updated map base map, and system configuration information from the backend server.

9. The on-site timber harvesting and requisition survey system according to claim 7, characterized in that, The on-site forest logging and requisition survey system also includes: a user interaction module; The user interaction module is used for user login, logout, and account switching. It provides a graphical user interface, displays maps, data forms, and system prompts, and supports password retrieval.

Images