269 results about "Diameter at breast height" patented technology

The invention discloses a laser radar technology-based method for acquiring the forest growing stock in the high-canopy-density area. According to the technical scheme of the method in the invention, the ground information of an acquired high-canopy-density forest area is subjected to the detection of seed points firstly. Secondly, each single tree is extracted through the tree segmentation process. Finally, the forest growing stock in the high-canopy-density forest area is acquired by utilizing a DBH (diameter at breast height) - tree height - crown diameter model. The method flow, from the collection of data to the acquisition of the forest growing stock, is proposed based on the airborne laser radar technology. Therefore, the method provides a technical solution scheme for the forestry surveying applications of airborne laser radars in the high-canopy-density area. Meanwhile, the method provides a high-efficiency and low-cost technical support for the checking of forest resources.

Provided is a tree measuring method based on an intelligent terminal lens. According to the method, defects of difficult operation, low efficiency, and complexity and inconvenience of conventional measurement by employing a measuring tape or a large-scale measuring instrument are overcome, the best shooting environment is obtained, valuable guidance opinions are provided for the improvement of data accuracy, a measuring model for tree height, the diameter at breast height, and crown diameter is developed with the combination of technologies of computer vision, the mathematical geometrical model, camera calibration, and the orthogonal test analysis, the model can be used for measuring tree information in garden management, and advanced means and tools are provided for tree information acquisition and management.

The invention discloses a tending method for promoting western sichuan subalpine natural secondary forest to restore by utilizing reserved trees. The method comprises the following steps: S1, selecting abies faxoniana, dragon spruce, hemlock, red birch and white birch as target tree species which need restoring in the secondary forest; S2, selecting the reserved trees; when the target tree species are the abies faxoniana, the dragon spruce or the hemlock, controlling the diameters at breast heights of the reserved trees to be more than or equal to 25cm; when the target tree species are the red birch or the white birch, controlling the diameters at breast heights of the residual trees to be more than or equal to 35cm; S3, dividing the restoration stage of the natural secondary forest according to the importance value of dominant tree species of community, wherein the restoration stage of the natural secondary forest is divided into a bushwood stage, a birch broad-leaved forest stage and a mixed broadleaf-conifer forest stage; S4, tending at the bushwood stage, tending at the birch broad-leaved forest stage and tending at the mixed broadleaf-conifer forest stage. In the restoration process of the western sichuan subalpine natural secondary forest, the reserved trees are fully utilized to tend and manage the secondary forest, so that the adverse effects of felling to the service function of a forest ecosystem can be slowed down, update is promoted, and the time for enabling the secondary forest to be restored into a forest after felling is shortened.

The invention discloses a quick cultivating and planting method for large crape myrtle landscape trees. The quick cultivating and planting method is characterized by comprising the following steps: selecting a perishable weed-tree pile which is nearly 2m in height, 0.2-0.4m in lower-end diameter and 0.15-0.35m in upper diameter as a tree shaft model; firmly around the tree shaft model, planting un-branched crape myrtle trees of 2-3 years in the soil, wherein the adjacent trunks are close to each other; using a plastic film to firmly cover and fix the trunks on the tree shaft model; removing the film in late June of the year, using a new film to recover the trunks in the late autumn, removing the new film in late June of the next year; and covering the trunks for another time by another new film in the late autumn, and removing the coating and the bonded films in the late June of the third year; and carrying out nutrient and water management according to a normal management method of an artificial cultivation method of crape myrtle during the whole cultivating and planting period. The quick cultivating and planting method can quickly cultivate large crape myrtle landscape trees within three years; the diameter at breast height of the trees can be designed by pre-selecting the diameter size of the model shaft model; the cultivated and planted large landscape trees are smooth and upright in trunks; the main branches are good in modelling; and the planting and cultivating survival rate is 100%.

The invention discloses a tree diameter at breast height automatic measurer, which relates to a measurement device, particularly relates to a wireless sensor network-based tree diameter at breast height automatic measurer and belongs to the technical field of tree measurement tools. The tree diameter at breast height automatic measurer comprises a binding band; the binding band is a resistance band; one end of the resistance band is provided with a fixed knot and the other end of the resistance band is provided with a mobile knot; the fixed knot is arranged in a fixed knot box, and a first buckle is arranged on the side surface of the fixed knot box; the mobile knot is arranged in a spring pressure box, a second buckle is arranged on the side surface of the spring pressure box, the first buckle and the second buckle are located in the same horizontal plane, and the first buckle and the second buckle are connected via a clamping band; a fixed knot wire and a mobile knot wire are respectively connected onto the fixed knot and the mobile knot, and tail ends of the fixed knot and the mobile knot are sealed in the spring pressure box; tail ends of the fixed knot wire and the mobile knot wire are bent; and the spring pressure box is internally provided with a measurement control unit. The measurement reading is accurate, the efficiency is high, and the safety is good.

The invention relates to the technical field of garden tree plantation and especially relates to a method for transplanting megaphanerophyte. The method comprises following steps: seedling selection: selecting megaphanerophyte having no diseases or pests; seedling processing: removing crown width and keeping first level branches and cultivating the seedlings in the original planting field for at least one year; digging the seedlings out: digging to the position where the ground diameter locates, keeping 20 to 30 % large roots around and cutting off the other roots, spraying mulch solution for each plant; making soil balls: keeping soil balls according to the size of the seedlings, wherein the diameter of the soil balls is 6 to 8 times of the diameter at breast height; cultivating fine roots; transplanting: after 30 days of root cultivation, directly cutting off the remained axial roots and transporting the roots to planting fields for plantation; maintenance after transplanting; later routine management. The invention provides a method for transplanting megaphanerophyte, which can effectively guarantee the survival rate of megaphanerophyte transplantation and can reduce the complexity and difficulty in implementation during the transplantation of megaphanerophyte.

The invention discloses a method that under the condition that a standing tree is not hewed down, the height of the standing tree, the diameter and the growing stock of any place of the standing tree are measured, and particularly, through the method of edge extraction of a forest in a digital photo, relevant data are measured. The stereoscopic photograph is applied to the forestry, the standing tree does not need to be hewed down, and the height of the standing tree, the diameter and the growing stock of any place of the standing tree can be measured, the new method is brought to the comprehensive analysis of growth conditions of trees, and the method enables forestry investigation to be more convenient and accurate. The method that the common camera is used for carrying out stereoscopic photograph tree measurement is simple and easy to operate, as long as people strictly operate according to technical requirements, the satisfactory investigation result can be obtained.

The invention discloses a tree size measurement device and method based on angular measurement, belonging to a measurement instrument and a measurement method, in particular to a measurement device and method used for measuring the tree height, the diameter at breast height and the diameter of the crown in any environment in the forest survey. The device comprises a horizontal scale, a vertical scale, a horizontal spindle, a fixing device and a measurement device, wherein the vertical scale horizontally slides along the upper surface of the horizontal scale; the horizontal spindle is configured on the top end of the vertical scale; the fixing device is connected with the top end of the horizontal spindle; the measurement device is connected with the fixing device; the vertical scale comprises a scale sleeve and a scale rod, wherein the scale rod can stretch in the scale sleeve along the vertical direction; the rotation plane of the horizontal spindle is a horizontal plane; the fixing device comprises a vertical spindle; and the rotation plane of the vertical spindle is vertical to the horizontal plane. With the method, the measurement can be finished with the cooperation of a trigonometric function with a four arithmetic operation, and therefore, the device and the method have the beneficial effects of convenience in measurement and low construction cost.

The invention discloses a stem DBH (diameter at breast height) measuring method based on machine visual sense and the three dimensional reconstruction technology; the method is realized by the following specific algorithms and models: 1, an intelligent mobile terminal equipment camera calibration model and algorithm, a camera distortion rectification model and algorithm; 2, a two dimensional imagecoordinate system-three dimensional world coordinate system reconstruction model used for solving the problems that unit pixels under different distances are matched with different physical dimensions in the reality world, thus measuring the stem DBH from different distances; 3, a natural environment stem trunk contour detection and extraction algorithm; 4, a stem trunk contour minimum external connection rectangular detection algorithm; 5, a stem trunk height and DBH measuring algorithm used for measuring the DBH of a single stem in a single image. The method can solve the problems in the forest resource investigation works like complex environments, large laboring intensity, and an existing method overly relies on artificial measurements; the method can reduce laboring intensity and labor cost, thus improving working efficiency.

The invention discloses a method for measuring a forest based on an electronic theodolite and a total station. The method comprises the following steps that: the electronic theodolite and the total station which serve as tools acquire all factor data of forest stands; a personal digital assistant (PDA) stores and processes data; and the electronic theodolite and the total station directly observe the coordinates, diameters at breast height and heights of trees from sampling measurement points, so that the forest accumulation of the forest stands, the average height and average density of the forest stands and diameter order distribution can be accurately and quickly acquired in real time. Compared with the conventional method, the method has the advantages that: time is saved, working load is reduced, and working efficiency is improved; and the data is stored and processed by programming of the PDA, and the degree of automation of operation can be greatly improved.

The invention relates to the technical field of grafting for improving and optimizing plant varieties, in particular to a rapid propagation method for euonymus japonicus arborization, which includes grafting time selection, selection and preparation of cions, grafting method and post-grafting management. The grafting method is as follows: euonymus bungeanus, the diameter at breast height of which is more than 15cm to 25cm, is selected as a stock, and the euonymus japonicus cions are grafted on four to five primary branches of the euonymus bungeanus, which are at the altitude of 5cm to 6cm on the tree. The euonymus japonicus varieties are euonymus japonicus L. Cv. 'aureo-marginatus' and euonymus japonicus L. Cv. albo-marginatus. By means of the systematic growth management, the rapid propagation method for euonymus japonicus arborization increases the survival rate of seedlings, and broadens the range of growing the euonymus japonicus varieties, moreover, the time of putting seedlings into the greening market is greatly advanced, and thereby the market price of the seedlings is high, so that the economic benefit is high.

The invention discloses a system and a method for quickly obtaining forest above-ground biomass. A forest crown image is accurately obtained by using an unmanned aerial vehicle system with high resolution, the crown area of woods is obtained by analyzing the forest crown image, the diameter at breast height of the woods is measured in field, a diameter at breast height and crown area regression equation and an above-ground biomass and crown area regression equation are established, the diameter at breast height of woods in a forest to be predicted is obtained through the diameter at breast height and crown area regression equation, the above-ground biomass of woods in the forest to be predicted is obtained through the above-ground biomass and crown area regression equation, and then the overall above-ground biomass of the forest to be predicted is obtained. The method provided by the invention is quick, effective, accurate in result and relatively low in cost, and is beneficial for popularization and wide application of unmanned aerial vehicle technology in forestry investigation.

The invention discloses a method for measuring and computing a forest stock volume parameter, which belongs to a method for measuring forest land and computing a forest stock volume parameter by a panoramic-scanning laser distance measuring sensor. The method comprises the following seven steps: firstly, scanning forest stands by the laser distance measuring sensor; secondly, acquiring diameters at breast height; thirdly, computing the basal area per hectare of the diameters at breast height; fourthly, computing the average diameter at breast height; fifthly, computing the density of trunks; sixthly, computing vegetation cover rates at different heights; and seventhly, acquiring the coordinate pattern of forest tree distribution space. Since a non-contact mode is adopted for measuring and computing the forest stock volume parameter, the method is rapid, convenient and accurate, and is high in efficiency, low in labor intensity and capable of obtaining the vegetation cover rates at different heights in the vertical direction, which can not be provided by an existing method; the method can be used for estimating the forest stock volume and the forest biomass as being combined with aerial remote sensing and space remote sensing information.

The invention discloses a prediction method of ginkgo tree canopy biomass based on orthophoto images of unmanned aerial vehicles. the invention obtains the orthophoto image of the ginkgo tree by the unmanned aerial vehicle, Then the canopy area extraction, canopy width extraction, canopy height extraction, canopy area crown width tree height-DBH model, single tree canopy biomass empirical equationare performed, and single tree canopy biomass prediction is performed, the used tools include Pix4D, Arcgis; Constructed crown area & crown width & tree height- diameter at breast height (CA & CW & CHM-DBH) model has three variables, and the results of the model are more accurate. The method is convenient, efficient, low cost, high efficiency, data can be updated in real time; The invention has more accurate calculation results of the model; Features of low cost, high efficiency and real-time data updating.

The method of performing dendrometry and forest mapping utilizes a stereoscopic camera system, coupled with a machine vision system, to determine the diameters at breast height of selected trees in a forest, based solely on calculations performed from recorded digital image data, as well as to generate a map showing the coordinates and calculated diameters of the selected trees in the forest. A ground plane is first determined, and then bounding box coordinates are generated about selected tree stems of the recorded images. The bounding boxes are evolved to determine stem edges of the selected tree stems, and the diameter of each tree at breast height is then determined. Geographic location data is acquired for each tree, allowing a map to be generated which shows the location of each selected tree, along with a tag representative of geolocation data and corresponding diameter data.

The invention relates to a stumpage diameter at breast height measuring device, in particular to a stumpage diameter at breast height accurate real-time automatic measuring device. The stumpage diameter at breast height accurate real-time automatic measuring device comprises a positioning device and a measuring device fixed on the positioning device. A lower end of the measuring device is connected with an encoder. The measuring device includes a housing, and a main shaft and a measuring line which are located within the housing. One end of the measuring line is wound on the main shaft; the other end of the measuring line extends out of one side of the measuring device and is fixed with the other end of the measuring device after being wound around the stumpage; and the encoder is connected with a lower end of the main shaft. The device of the invention can carry out an accurate real-time automatic measurement, and has the beneficial effects of easy installation and maintenance, easy data processing and acquisition, and the like.

The invention discloses a method for determining wood ages by adopting a model method. The method adopts the mathematic model method to predict the wood ages for a natural different-age-wood forest class consisting of the same tree species and comprises the steps that firstly, woods in the small class are sequentially marked from young trees according to diameter class from small to large; secondly, a mathematic model of the natural forest class consisting of the same tree species is established according to wood diameters at breast heights of all diameter classes marked before observation in successive years; finally, the ages of the woods are calculated through substitution by combining a parameter expression. The method does not need wood felling, does not damage the woods and is small in working amount and easy to operate.

The invention discloses a portable type tree DBH measuring device and measuring method, solves the problems that in the prior art tree DBH measuring devices are large in size and inconvenient to carry and the diameters of the trees with large diameters are difficult to measure accurately and has the advantages that carrying is convenient and measuring is accurate. During measuring, a surface formed by a first clamp rod and a second clamp rod is perpendicular to the axis of the tree, the opening degrees of the first clamp rod and the second clamp rod are adjusted, so that both the first clamp rod and the second clamp rod are tangent with the tree, the position of a horizontal rod is adjusted so that the horizontal rod is tangent with the tree, and the tree diameter is calculated according to the geometrical relationship of the perimeter of a triangle formed by the first clamp rod, the second clamp rod and the horizontal rod, the opening degrees of the first clamp rod and the second clamp rod and the tree diameter.

The invention discloses an establishment method used for a forest stand space structure optimization model and based on a particle swarm algorithm. The establishment method comprises the steps as following: a forest stand area is measured, forest trees which belong to climax group composition tree species and transitional community tree species in the forest stand are measured, the diameter at breast height of each forest tree is larger than 5 cm, and space coordinates, tree species, a mixed degree, a competition index, a uniform angle index, a stand layer index, a space density index and an open comparison index of each forest tree are obtained; and the particle swarm algorithm is adopted, the mixed degree, the competition index, the uniform angle index, the stand layer index, the space density index and the open comparison index which are included in a forest stand space structure are taken as optimization objectives, a multi-objective optimization model of forest space structures in forest stand level is established, forest trees and space structure units which are required to be regulated are confirmed according to objective trees output by the model and space structure units formed by peripheral adjacent trees, the forest stand space structures are regulated, so that the forest structures tend to a reasonable state, and an ecosystem function is recovered.

The invention discloses a rapid cultivation method for colorful Magnolia denudata, which comprises the steps that: in late February to early March, a Magnolia denudata with the diameter at breast height being 8-15cm is selected as a stock, several Magnolia denudata branches are left at the branches of a second layer, Magnolia denudata scions capable of blooming flowers with different colors such as red, yellow, purple and the like are grafted on other branches, and after one-year meticulous cultivation, the grafted tree blooms bright flowers with different colors such as white, red, yellow, purple and the like and is extremely beautiful and splendid. By grafting different species and different colors of magnolia denudata scions on the Magnolia denudata tree which can only bloom flowers with a single color to cultivate a Magnolia denudata tree commodity seedling capable of blooming colorful flowers, the rapid cultivation method disclosed by the invention not only improves the appreciation effect, but also greatly improves the economic benefit.

The invention discloses an arbor transplanting method reducing a crown recovery period. The method comprises: transplanting arbors and culturing arbors in autumn or spring, including cutting roots, digging out, transporting, transplanting, and maintaining, trimming seedling crown diameter after cutting roots; after digging-out, wrapping the seedlings at once, and transporting the seedlings at once after wrapping, in a transportation process, using a black shading net to shade and keep out the wind, moisturizing for 1-2 times in the transportation process; in a maintenance process, through watering and moisturizing the branches and crown of the seedlings, keeping humidity below the crown of the seedling to be higher than 90, and keeping planting soil water content to be 45-50%. In the method, the crown diameters of the seedlings are trimmed after roots are cut, the diameter at breast height is 15-20 cm, 20-30% of five-level branches are kept, and the diameter at breast height is 20-30 cm, 65-75% of four-level branches are kept. The method effectively shortens crown recovery periods, and can completely recover crown shapes.