A method of photogrammetry for forest fixed plots
A technology of photogrammetry and fixed plots, applied in the field of photogrammetry of forest fixed plots, can solve the problems of poor accuracy, long data acquisition cycle, low efficiency, etc., and achieve the effects of strong applicability, reduced measurement work intensity, and fast investigation
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[0019] (1) Under arbitrary terrain conditions, first select a fixed sample plot of 20m×20m, and design the photographic baseline along the diagonal direction of the sample plot, as shown in the figure, design the photographic baseline along AC, S 1 and S 2 are two observation points in the baseline direction, S 1 and S 2 On both sides of the center point O of the sample plot and at the same distance from point O, the horizontal distance between the two observation points is 2m. In addition, a red and white flower pole with equal intervals is set at any position in the photographic field of view as Measurement reference object;
[0020] (2) Under the condition of ensuring any photography, use a fixed-focus digital camera to take two samples of digital photos;
[0021] (3) At the fixed point S 1 Place a fixed-focus digital camera on the point, aim at point A in the diagonal direction of the sample plot, and take a digital photo. Then, turn the camera clockwise to take pictur...
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