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Study on Orthophoto-forest Map Making and Forest Measurement Based on Aeroscape

Author: ZhiChangGui
Tutor: LangKuiJian
School: Northeast Forestry University
Course: Forest Management
Keywords: Orthophoto Forest map Bundle aerial triangulation Forest measurement
CLC: S771
Type: PhD thesis
Year: 2005
Downloads: 453
Quote: 12
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Abstract


The use of aerial photographs (hereinafter referred to as aerial photographs) as forestry mapping and forest measurements is the main task of the investigation of forest resources. Based on the self-calibration bundle block adjustment principle, the use of the ERDAS OrthoBhSE module 2003 Northeast Forestry University cap children Cairn test forest shot 176 aerial photos, a total of 13 destinations with air encryption, and its digital differential rectification, and finally generate the the cap child Forest Farm scale of 1:25000 image forest map and traditional forest map and various facilities industry, scale 1:10000 image forest map and traditional forest map, image maps point error is only 2.953m, to a very high accuracy. This is also the first time through the forestry sector in China digital differential correct the resulting orthophoto forest map and forest map. Orthorectified to eliminate or greatly reduce the image displacement caused by two factors due to camera tilt and terrain, to eliminate or greatly reduce the impact of aerial photos of various errors, including: camera objective lens distortion, deformation of the photosensitive material, atmospheric refraction and the curvature of the Earth as the point coordinates. Finally, tip Lizi furrow industry, for example, the use of the production of orthophotos forest map and bundle aerial triangulation aerial photographs orientation elements and digital surface model, the forest measurement, including the area of ??the canopy degree, stand average height and single stumpage tree height measurements. This process, complete the following tasks: first, the use of GPS RTK surveying technology, measured in the wild, the control points of the cap child Hill 91 (Fixed), all in accordance with the distribution scheme approximate density of weeks, level high, four control points plus the purchase of 95 of the control points, the maximum error of the control points for the dm-level. On four 1:50,000 scale topographic maps 600dpi resolution scans, using cubic polynomial to correct registration accuracy are as follows: X coordinate of the control point of a topographic map root mean square error for 0.0036 pixel Y root mean square error for 0.0014 pixel, total root mean square error for 0.0038 pixel; the X root mean square error of the control points of the second piece of topographic maps 0.0042pixel, Y root mean square error 0.0020pixel, total root mean square error 0.0047pixel; third piece of topographic control point X error rms 0.0043pixel, Y root mean square error for 0.0022 pixel, total root mean square error for 0.0048 pixel; the fourth site map control point X mean square error root as 0.0026 pixel Y root mean square error for 0.0007 pixel, total root mean square error for 0.0027 pixel. Finally, after stitching four topographic map accuracy test results showed that: the six checkpoints, the X coordinate error (AX) maximum of 1.741m, a minimum of 0.037m, an average of 1.119m; Y coordinate error ( maximum ΔY) is 1.501m, and the minimum value is 0.516m, 1.006m averages. Coordinates of a single checkpoint root mean square error (t_i) Max 2.026m, minimum 0.517m, the total root mean square error of all checkpoint coordinates (T) is 1.749m. Triangular linear interpolation and triangular nonlinear interpolation method, generate a resolution of 5m DEM and the checkpoint law and contour playback sampling method DEM accuracy test, which the playback contour method , first proposed the \The checkpoint Act 49 control points were selected for testing, the results show: the linear interpolation root mean square error for the 4.1m, the nonlinear interpolation total root mean square error of 3.8m, high accuracy of non-linear interpolation. Playback contour method of choice of the contour and the original contour line of 18 km grid compare results show: the linear interpolation of the degree of coincidence is 96%, nonlinear interpolation coincidence degree is 96.5%. Higher the nonlinear interpolation overall playback accuracy. Fourth, first proposed the use of absolute and relative position of seeking aerial photographs exterior orientation elements of the initial value method, solve the application of self-calibration bundle block adjustment exterior orientation elements of the initial value problem. Fifth, the use of the theory of self-calibration bundle block adjustment, the exterior orientation elements of the aerial photographs of understanding and the operator, the original

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CLC: > Agricultural Sciences > Forestry > Forest Engineering and forestry machinery > Forest measurement, forestry survey
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