A method for rapid measurement of regional terrain elevation

Abstract

The application discloses a kind of regional terrain elevation quick measurement methods, it is related to elevation measurement technical field, the method comprises the following steps: S01, laser level is arranged in the measurement area, and ensure that its plane light energy covers the high point and low point of measurement area;S02, rough adjustment and fine adjustment are carried out to laser level using standard gauge, so that the leveling error is less than 1mm;S03, handheld measuring rod is placed in known elevation reference point, the current elevation reference point is input by digital keyboard and the first button is pressed for a long time to complete reference value conversion;S04, the region to be measured is divided into multiple measurement sections, and the number of measuring points and measurement interval of each section are determined, and after the parameters are input into computer, measurement bridge is built for measurement.The application realizes that only one person is needed to operate to quickly and accurately complete the regional terrain elevation automation measurement, significantly improves efficiency and reduces human error.

Description

Technical Field

[0001] This invention relates to the field of elevation measurement technology, and in particular to a rapid method for measuring regional topographic elevation. Background Technology

[0002] In fields such as engineering construction, topographic surveying, and precision laboratory testing, elevation measurement is a crucial foundational task for obtaining elevation information of ground points. Traditional elevation measurement methods typically rely on the combination of a level instrument and a leveling rod, requiring a three-person team: one person stands at the measuring point with the rod, one operates the instrument for observation, and the other records the data. This approach is not only labor-intensive but also inefficient. Each measuring point requires manual reading and recording, which is prone to significant human error due to operator fatigue, reading deviations, or the leveling rod not being strictly vertical. This makes it difficult to meet the dual demands of efficiency and accuracy required by modern engineering surveying.

[0003] With the development of satellite positioning technology, modern measurement methods such as GPS and GNSS-RTK are gradually being applied to elevation measurement, achieving a certain degree of automation and improved accuracy. For example, my country has established a regional precise elevation datum, which uses satellite positioning to replace traditional leveling. A Chinese patent, CN120352900A, published on July 22, 2025, discloses a GNSS-RTK-based topographic mapping method and system. This invention improves measurement efficiency and real-time performance in complex terrain through multipath suppression and dynamic data fusion. Meanwhile, the "Elevation Calculation Patent Based on Delaunay Triangulation Network" proposed by Southern Surveying and Mapping improves the processing accuracy and speed of large-scale topographic elevation data through triangulation network construction and spatial query optimization.

[0004] The shortcomings of existing technologies are that GNSS-based methods are poorly applicable in areas with severe obstruction or poor signal (such as indoor, underwater, or high-concentration suspended matter environments); while traditional optical instruments, although highly accurate, depend on line-of-sight conditions, are significantly limited by the environment and terrain, and require multiple people to cooperate in the measurement.

[0005] Therefore, developing a height measurement method that is highly adaptable, easy to operate, and can balance accuracy and efficiency remains an urgent need in the current surveying and mapping field. Summary of the Invention

[0006] To address the aforementioned technical problems, the present invention provides a method for rapid measurement of regional topographic elevation, the method comprising the following steps:

[0007] S01. Set up a laser level within the measurement area and ensure that its planar light energy covers the high and low points of the measurement area.

[0008] S02. Use standard gauge blocks to perform coarse and fine adjustments on the laser level to ensure that the leveling error is less than 1mm.

[0009] S03. Place the handheld measuring rod on a known elevation benchmark point, input the current elevation benchmark point through the numeric keypad, and press and hold the first button to complete the benchmark value conversion;

[0010] S04. Divide the area to be measured into multiple measurement sections, determine the number of measurement points and measurement intervals for each section, input the parameters into the computer, and then build a measurement bridge for measurement.

[0011] S05. The handheld measuring rod reaches the measuring point along the measuring bridge and is vertically lowered until the sound and light prompt module issues a prompt, indicating that the interface determines that the sensor has contacted the terrain interface;

[0012] S06. Press the second button to send the elevation and tilt data acquired by the measuring point to the computer for storage;

[0013] S07. Repeat steps S05 to S06 to complete the measurement of all measuring points of a cross section. Press and hold the second button to switch to the next cross section and continue the measurement.

[0014] S08. Based on the tilt angle data recorded by the vertical sensor, tilt angle compensation is performed on the measured value. The compensation calculation formula is: V 补偿值 =V 实测值 -(U+W)cosα, where V 实测值 The measured value is the point value after elevation conversion, U is the measured value of the photosensitive array sensor, W is the distance from the measured value of the photosensitive array sensor to the lowest point of the interface sensor, and α is the angle between the side rod and the vertical line.

[0015] Preferably, the laser level is used to emit a plane light that emits red or green light;

[0016] The lower end of the handheld measuring rod is equipped with an interface judgment sensor;

[0017] The handheld measuring rod is equipped with a photosensitive array sensor, a vertical sensor, an audio-visual prompt module, a numeric keypad, a first button, and a second button.

[0018] Preferably, the number of laser levels in step S01 is determined according to the size of the measurement area, and the size of each measurement area is determined by the laser level as a radius of 2m to 8m.

[0019] Preferably, in step S01, the laser level selects the emission frequency band according to the lighting environment by selecting a red light source when the lighting environment is good and a green light source when the lighting environment is poor.

[0020] Preferably, the interface judgment sensor selects the type according to the type of terrain to be measured as follows:

[0021] Pressure-type interface sensors are selected for dry beach terrain.

[0022] Low-concentration underwater terrain selection optical interface to determine sensor;

[0023] High-concentration underwater terrain selection electrical interface sensor.

[0024] Preferably, in step S02, fine-tuning the laser level includes:

[0025] S21. Place the first standard gauge block horizontally at a distance of about ten meters from the laser level, read the value on the photosensitive array sensor, and obtain the first comparison data.

[0026] S22. Superimpose the second standard block onto the first standard block, and read the value on the photosensitive array sensor again to obtain the second comparison data;

[0027] S23. Adjust the fine-tuning screw on the level by taking the difference between the first comparison data and the second comparison data and the difference between the thickness of the second standard gauge block, until the difference is less than 1mm.

[0028] Preferably, in step S02, the laser level is arranged so that the planar light emitted by it illuminates the photosensitive array sensor of the handheld measuring rod located at the highest and lowest points of the measurement area.

[0029] Preferably, the tilt compensation in step S08 is performed during the data post-processing stage.

[0030] A measurement system for implementing the above scheme includes:

[0031] At least one laser level is used to emit horizontal light.

[0032] At least one handheld measuring rod, comprising:

[0033] A photosensitive array sensor is used to sense the position of a horizontal light spot on the pole.

[0034] The interface detection sensor is installed at the lower end of the measuring rod and is used to determine whether the measuring rod is in contact with the terrain interface.

[0035] A vertical sensor is used to record the real-time tilt angle of the measuring rod;

[0036] The audio-visual prompt module is used to indicate that the measuring rod has contacted the terrain interface;

[0037] Numeric keypad for inputting reference elevation values;

[0038] The first and second buttons are used to confirm elevation modification and set data transmission.

[0039] A computer is used to receive and store measurement data wirelessly transmitted from a handheld measuring rod.

[0040] Preferably, the handheld measuring rod integrates a wireless transmission module for sending data to a computer.

[0041] The present invention has at least the following beneficial effects:

[0042] By integrating a laser level with a smart handheld measuring rod, the system enables rapid measurement of regional terrain elevations by a single operator, significantly reducing labor and time costs and improving operational efficiency.

[0043] Furthermore, during the measurement process, the photosensitive array sensor automatically captures the position of the light spot, and the vertical sensor is used for real-time tilt monitoring and compensation, which effectively improves the accuracy and reliability of data measurement and reduces human error.

[0044] Meanwhile, the audio-visual prompt module and wireless data transmission function enable intelligent and automated operation, avoiding the tediousness and errors of traditional manual recording and ensuring the real-time and consistency of data.

[0045] This invention exhibits strong environmental adaptability, allowing for the selection of appropriate light sources and sensors based on varying lighting conditions and terrain types. It is suitable for diverse and complex terrain scenarios, including dry beaches and underwater environments, thus expanding its application scope. Whether conducting small-scale precision measurements or large-area rapid mapping, it can be flexibly carried out through single-device area-by-area measurements or multi-device simultaneous measurements, significantly improving the overall efficiency and engineering practical value of terrain elevation measurement. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 This is a flowchart of a method for rapid measurement of regional topographic elevation provided in Embodiment 1 of the present invention;

[0048] Figure 2 This is a schematic diagram of the handheld measuring rod provided in Embodiment 1 of the present invention;

[0049] Figure 3 This is a flowchart of the process provided in Embodiment 1 of the present invention;

[0050] Figure 4 This is a schematic diagram of the tilt compensation implementation provided in Embodiment 1 of the present invention.

[0051] Explanation of reference numerals in the attached figures:

[0052] 1. Photosensitive array sensor; 2. Interface judgment sensor; 3. Audio-visual prompt module; 4. Vertical sensor; 5. Numeric keypad; 6. First button; 7. Second button; 8. Handheld measuring rod; 9. Planar light; 10. Topography to be measured; 11. Laser level. Detailed Implementation

[0053] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0054] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or server that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or devices.

[0055] Example 1

[0056] This embodiment provides a method for rapid measurement of regional topographic elevation, the method including the following steps, such as... Figure 1 As shown:

[0057] S01. Arrange a laser level 11 within the measurement area, ensuring that its planar beam 9 can cover both the high and low points of the measurement area.

[0058] It should be noted that the number of laser levels 11 is determined according to the size of the measurement area, and the size of each measurement area is determined with a radius of 2m to 8m around the laser level 11. Furthermore, the laser level 11 selects its emission frequency band according to the lighting environment: red light source is selected when the lighting environment is good, and green light source is selected when the lighting environment is poor.

[0059] S02. Use standard gauge blocks to coarsely and finely adjust the laser level 11 to make the leveling error less than 1mm.

[0060] S03. Place the handheld measuring rod 8 on a known elevation benchmark point, input the current elevation benchmark point through the numeric keypad 5, and press and hold the first button 6 to complete the benchmark value conversion.

[0061] S04. Divide the area to be measured into multiple measurement sections, determine the number of measurement points and measurement intervals for each section, input the parameters into the computer, and then build a measurement bridge for measurement.

[0062] Specifically, the laser level 11 is arranged and leveled, reference value conversion is performed, and measurement section settings are established. Depending on the area and elevation variation required for measurement, appropriate points and heights are selected to place the laser level 11. The core measurement area is encompassed within a radius of 2m to 8m centered on the laser level 11. This area represents the optimal working zone for the level's horizontal beam. The level height is adjusted to ensure that the beam illuminates the photosensitive array sensor 1 of the handheld measuring rod 8 at both the lowest and highest points of the measurement area. After determining the positioning, the level is leveled. The level is used for coarse adjustment. After coarse adjustment, fine adjustment begins. The first standard gauge block is placed horizontally approximately ten meters from the laser level. The side rod is placed on the gauge block to read the value. A second standard gauge block is placed on top of the first, and the side rod is placed on the second gauge block to read the value. The difference between the two readings is compared to the thickness of the second gauge block. If the level is properly adjusted, the difference between the two readings and the thickness of the second gauge block should be less than 1mm. If the difference is greater than 1mm, the fine-tuning screws on the level are adjusted until the error between the measurement result and the gauge block value is less than 1mm. After leveling, the technician places the handheld measuring rod 8 on a nearby elevation benchmark. After an audio-visual prompt, the elevation of this benchmark is entered via the keyboard. Then, the first button 6 is pressed and held to convert all side rod measurements in the area into actual elevation values. At this point, with the laser level 11 in operation, subsequent side rod measurements will be the actual elevation values, requiring no further conversion. After the above preparations are completed, the underground area to be measured is divided into multiple measurement sections according to the experimental requirements. The number of measurement points and measurement intervals for each section are determined, and the above parameters are entered into the computer as data storage tags for each measurement point. After the measurement points of the section are planned, a measurement bridge is built according to the distribution of the section. The surveyors can reach the measurement point location along the measurement bridge without disturbing the terrain to be measured.

[0063] If coarse adjustment is performed using the built-in bubble level of the level, fine adjustment can begin after the coarse adjustment is completed. Place the first standard gauge block horizontally about ten meters away from the laser level, place the side rod on the standard gauge block and read the value. Place the second standard gauge block on the first standard gauge block, place the side rod on the second gauge block and read the value. Compare the difference between the two values ​​with the thickness value of the second standard gauge block. If the level has been leveled, the difference between the two values ​​and the thickness difference of the second standard gauge block should be less than 1mm. If the difference is greater than 1mm, adjust the fine adjustment screw on the level to fine adjust until the error between the measurement result and the gauge block value is less than 1mm.

[0064] S05. The handheld measuring rod 8 is moved along the measuring bridge to the measuring point. The handheld measuring rod 8 is then lowered vertically until the sound and light prompt module 3 issues a prompt, indicating that the interface has determined that the sensor 2 has contacted the terrain interface.

[0065] S06. Press the second button 7 to send the elevation and tilt data obtained from the measuring point to the computer for storage;

[0066] S07. Repeat steps S05 to S06 to complete the measurement of all measuring points of a cross section. Press and hold the second button 7 to switch to the next cross section and continue the measurement.

[0067] Specifically, such as Figure 3 As shown, the technician holds a handheld measuring rod 8 to the first measuring point of the first section, keeping the rod vertical and probing downwards until it reaches the terrain interface. If there is no indication, it means the rod has not touched the terrain interface, and the rod continues to descend until an audible and visual prompt is issued. If there is an audible and visual prompt, it means the rod has touched the terrain interface, and the rod stops descending. The technician then presses the second data transmission button to send the elevation and inclination data of this point to the computer. The computer records this data as the value of the first measuring point of the first section, and then repeats the above steps to measure the second point. After all measuring points of the first section are measured, the technician presses and holds the data transmission button to proceed to the next section measurement. The computer records the subsequent data for the second section or the next section. After leveling, the technician places the handheld measuring rod 8 on the elevation benchmark near the area. In this example, the measurement range is small, with only one benchmark. The benchmark elevation is 30.5cm. After the audio-visual prompt, the technician inputs the benchmark elevation via the keyboard and then presses and holds the first button 6 to convert the side rod measurements of the area into the actual elevation values. In the state of the laser level 11 at this point, the subsequent side rod measurements are all actual elevation values ​​and do not need to be converted again.

[0068] Measurement cross-section setup: The measurement area is rectangular. According to the test requirements, five equidistant measurement cross-sections are arranged within the measurement area. Ten points are measured at equal intervals on each measurement cross-section. The number of cross-sections and the number of measurement points on each cross-section are entered into the computer as data storage tags for each measurement point. After the cross-section measurement points are planned, a measurement bridge is built according to the cross-section distribution. Surveyors can reach the measurement point location along the measurement bridge without disturbing the terrain to be measured.

[0069] S08. Based on the tilt angle data recorded by the vertical sensor 4, tilt angle compensation is performed on the measured value. The compensation calculation formula is: V 补偿值 =V 实测值 -(U+W)cosα( Figure 4 ), where V 实测值 The measured value is the point value after elevation conversion, U is the measured value of the photosensitive array sensor, W is the distance from the measured value of the photosensitive array sensor to the lowest point of the interface sensor, and α is the angle between the side rod and the vertical line.

[0070] Specifically, in data compensation analysis, the side rod may not be in a vertical state during measurement, so it is necessary to compensate for the inclination angle of the measured value. The compensation calculation formula is as follows;

[0071] V compensation value = V measured value - (U + W)cosα

[0072] V compensation value is the point measurement value after angle compensation, V actual measurement value is the point measurement value after elevation conversion, U is the actual measurement value of photosensitive array sensor 1, W is the distance from the actual measurement value of photosensitive array sensor 1 to the bottom of the interface sensor, and α is the angle between the side rod and the vertical line recorded by vertical sensor 4.

[0073] It should be noted that if the measurement area is large and the measurement range of a single level cannot be covered, the measurement can be carried out in two ways. First, if there is only one handheld measuring rod 8, after measuring one area, move the level to the next area and repeat steps two to four to complete the data measurement. Second, if there are multiple handheld measuring rods 8, multiple laser levels 11 can be arranged in conjunction with the handheld measuring rods 8. After converting the reference elevation for each rod, the measurement can be carried out simultaneously to improve the measurement efficiency.

[0074] The measurement begins with the technician holding a probe and reaching the first measuring point on the first cross-section. The probe is held vertically and lowered until it reaches the terrain interface. If no indication is given, it means the probe has not touched the terrain interface; the probe continues to lower until an audible and visual alert is issued. If an audible and visual alert is issued, it means the probe has touched the terrain interface; the probe stops lowering, and the second data transmission button is pressed to send the elevation and dip data for this point to the computer. The computer records this data as the value of the first measuring point on the first cross-section. The above steps are then repeated to measure the second point. After all measuring points on the first cross-section have been measured, the data transmission button is pressed and held to proceed to the next cross-section. The computer records the subsequent data for the second or the next cross-section.

[0075] The measurement storage format is as follows:

[0076] Unit: centimeters (cm)

[0077]

[0078] The above measurement data are the actual measured values ​​after elevation conversion. During the measurement process, the measuring rod may not be perpendicular to the terrain to be measured 10, and tilt compensation is required. Taking the first measuring point as an example, the actual measured value after elevation conversion is 20.4cm, and the tilt angle during measurement is 1.2°. The compensation calculation formula is as follows;

[0079] V 补偿值 =V 实测值 -(U+W)sinα

[0080] The measured value is larger than the true value because it is tilted. The deviation caused by the tilt needs to be subtracted. U is 33.6cm, W is 100cm, sin(1.2°) is 0.0209, and the compensation difference is 113.6*0.0209=2.79cm. After compensation, the measured value is 20.4-2.79=17.61cm. The calculation method is the same for other measuring points.

[0081] As a further embodiment of the present invention, the laser level 11 is used to emit a plane light 9 of red or green light;

[0082] The lower end of the handheld measuring rod 8 is equipped with an interface judgment sensor 2;

[0083] The handheld measuring rod 8 is equipped with a photosensitive array sensor 1, a vertical sensor 4, an audio-visual prompt module 3, a numeric keypad 5, a first button 6, and a second button 7.

[0084] Specifically, it needs to be implemented in conjunction with a laser level 11 and a handheld measuring rod 8. The laser level 11 is a conventional level that can emit a horizontal light 9, with the emission frequency bands including red light (wavelength approximately 635 nanometers) and green light (wavelength approximately 515 nanometers). The lower end of the handheld measuring rod 8 is equipped with an interface judgment sensor 2. The rod body is equipped with a photosensitive array sensor 1, a vertical sensor 4, an audio-visual prompt module 3, a digital input keyboard, and two data setting buttons. It can also transmit data to a computer wirelessly. The interface judgment sensor 2 can determine whether the side rod touches the terrain. The photosensitive array sensor 1 can detect the specific position of the light spot on the rod body. The vertical sensor 4 can record the real-time tilt angle of the side rod. The audio-visual prompt module 3 can prompt whether the side rod touches the terrain interface. The numerical input keyboard can input the current reference elevation. One of the two buttons is the elevation modification confirmation button, and the other is the data transmission setting button. Based on the measurement method and the size of the measurement area, the number of laser levels 11 and the frequency band of the light source are determined. A suitable interface judgment sensor 2 is selected according to the terrain type of the area to be measured. Red light source is selected for measurement in good lighting conditions, and green light source is selected for measurement in poor lighting conditions. A single laser level 11 can measure a circular area with a radius of 10 meters. For dry beach terrain, a pressure-type interface judgment sensor is selected; for underwater terrain (low concentration), an optical interface judgment sensor is selected; and for underwater terrain (high concentration), an electrical interface judgment sensor is selected. Specifically, the interface judgment sensor 2 is selected according to the type of terrain to be measured as follows:

[0085] Pressure-type interface sensors are selected for dry beach terrain.

[0086] Low-concentration underwater terrain selection optical interface to determine sensor;

[0087] High-concentration underwater terrain selection electrical interface sensor.

[0088] This embodiment integrates a laser level 11 with a smart handheld measuring rod, enabling rapid measurement of regional terrain elevation by a single operator, significantly reducing labor and time costs and improving operational efficiency. During the measurement process, the photosensitive array sensor 1 automatically captures the position of the light spot, combined with the vertical sensor 4 for real-time tilt monitoring and compensation, effectively improving the accuracy and reliability of data measurement and reducing human error. Simultaneously, the audio-visual prompt module 3 and wireless data transmission function enable intelligent and automated operation, avoiding the tediousness and errors of traditional manual recording and ensuring data real-time performance and consistency. This invention has strong environmental adaptability, allowing for the selection of appropriate light sources and sensors based on different lighting conditions and terrain types. It is suitable for various complex terrain scenarios such as dry beaches and underwater environments, expanding its application scope. Whether for small-scale precision measurement or large-area rapid mapping, it can be flexibly carried out through single-device area-by-area measurement or multi-device synchronous measurement, significantly improving the overall efficiency and engineering practical value of terrain elevation measurement.

[0089] Example 2

[0090] Based on the above embodiment one, this embodiment aims to provide a rapid regional topographic elevation measurement system, including as follows: Figure 2 As shown:

[0091] At least one laser level 11 is used to emit horizontal surface light 9;

[0092] At least one handheld measuring rod 8, which includes:

[0093] Photosensitive array sensor 1 is used to sense the position of the horizontal light spot on the pole;

[0094] Interface detection sensor 2 is installed at the lower end of the measuring rod and is used to determine whether the measuring rod is in contact with the terrain interface 10;

[0095] Vertical sensor 4 is used to record the real-time tilt angle of the measuring rod;

[0096] The audio-visual prompt module 3 is used to indicate that the measuring rod has contacted the terrain interface;

[0097] Numeric keypad 5 is used to input the reference elevation value;

[0098] The first button 6 and the second button 7 are used to confirm elevation modification and set data transmission.

[0099] A computer is used to receive and store measurement data wirelessly transmitted from a handheld measuring rod.

[0100] The handheld probe 8 integrates a wireless transmission module for sending data to a computer.

[0101] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0102] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is used as an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0103] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A method for rapid measurement of regional topographic elevation, characterized in that, The method includes the following steps: S01. Arrange a laser level (11) in the measurement area and ensure that its plane light (9) can cover the high and low points of the measurement area; S02. Make a coarse adjustment using the bubble level on the laser level (11), and then make a fine adjustment using standard gauge blocks. S03. Place the handheld measuring rod (8) on a known elevation benchmark, input the current elevation benchmark through the numeric keypad (5) and press and hold the first button (6) to complete the benchmark value conversion; S04. Divide the area to be measured into multiple measurement sections, determine the number of measurement points and measurement intervals for each section, input the parameters into the computer, and then build a measurement bridge for measurement. S05. Place the handheld measuring rod (8) above the measuring point along the measuring bridge, and vertically lower the handheld measuring rod (8) until the sound and light prompt module (3) issues a prompt, indicating that the interface judgment sensor (2) has contacted the terrain interface; S06. Press the second button (7) to send the elevation data and tilt data obtained by the measuring point to the computer for storage; S07. Repeat steps S05 to S06 to complete the measurement of all measuring points of a cross section. Press and hold the second button (7) to switch to the next cross section and continue the measurement. S08. Based on the tilt angle data recorded by the vertical sensor (4), tilt angle compensation is performed on the measured value. The compensation calculation formula is as follows: ； Wherein, V is the measured value after elevation conversion, U is the measured value of the photosensitive array sensor, W is the distance from the measured value of the photosensitive array sensor to the lowest point of the interface sensor, and α is the angle between the measuring rod and the vertical line. The laser level (11) is used to emit a plane light (9) that emits red or green light. The lower end of the handheld measuring rod (8) is equipped with an interface judgment sensor (2). The handheld probe (8) is equipped with a photosensitive array sensor (1), a vertical sensor (4), an audio-visual prompt module (3), a numeric keypad (5), a first button (6), and a second button (7). The number of laser level (11) in step S01 is determined according to the size of the measurement area, and the size of each measurement area is determined based on the laser level (11) as an area with a radius of 2m to 8m. The laser level (11) in step S01 selects the emission frequency band according to the lighting environment as follows: when the lighting environment is good, a red light source is selected, and when the lighting environment is poor, a green light source is selected. The interface judgment sensor (2) selects the type according to the type of terrain to be measured, specifically as follows: Pressure-type interface sensors are selected for dry beach terrain. Low-concentration underwater terrain selection optical interface to determine sensor; High-concentration underwater terrain selection of electrical interface sensor; In S02, fine-tuning the laser level (11) includes: S21. Place the first standard gauge block horizontally about ten meters away from the laser level (11), read the value on the photosensitive array sensor (1), and obtain the first comparison data; S22. Superimpose the second standard block on the first standard block, and read the value on the photosensitive array sensor (1) again to obtain the second comparison data; S23. Adjust the fine-tuning screw on the level by taking the difference between the first comparison data and the second comparison data and the difference between the thickness of the second standard gauge block, until the difference is less than 1mm. In step S02, the laser level (11) is arranged so that the plane light (9) emitted by it can illuminate the photosensitive array sensor (1) of the handheld measuring rod (8) located at the highest and lowest points of the measurement area. The tilt compensation in step S08 is performed during the data post-processing stage.

2. A measurement system for implementing the rapid regional topographic elevation measurement method of claim 1, characterized in that, include: At least one laser level (11) is used to emit horizontal light (9). At least one handheld measuring rod (8), which includes: A photosensitive array sensor (1) is used to sense the position of a horizontal light spot on the pole. Interface judgment sensor (2) is installed at the lower end of the measuring rod to determine whether the measuring rod is in contact with the terrain interface (10). Vertical sensor (4) is used to record the real-time tilt angle of the measuring rod; The sound and light prompt module (3) is used to indicate that the measuring rod has contacted the terrain interface; Numeric keypad (5) is used to input the reference elevation value; The first button (6) and the second button (7) are used for elevation modification confirmation and data transmission settings, respectively; A computer is used to receive and store measurement data wirelessly transmitted from a handheld measuring rod.

3. The measurement system according to claim 2, characterized in that, The handheld measuring rod (8) integrates a wireless transmission module for sending data to a computer.

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