Application of Small Unmanned Aerial Vehicle with Non-measuring Camera in Forestry Investigation

doi:10.13466/j.cnki.lyzygl.2017.02.018

Abstract

Abstract:

To enhance the technology for forestry investigation,our study focused on the application of small unmanned aerial vehicle (UAV) equipped with non-measuring camera in forestry investigation.In the study,we selected the Shisanling Forest Farm in Beijing as the study area to implement the test of airborne photographing.Moreover,intended for the characteristics of lens distortion in camera and large error of exterior orientation elements of the camera platform in UAV,we utilized a camera calibration algorithm and exterior orientation elements to inverse the accuracy exterior and interior orientation,and obtained the stereo images and orthophotos.In addition,the ground control points (GCPs) were used to carry on the geometric correction in the whole photo,and 3D measurement tools to measure the tree height in the three-dimensional area,and the GCPs to measure the area and perimeter of the mosaic area.Finally,the photo-measured results of tree height,area and perimeter were fitted to the field-measured results with empirical models,which also tested the photo-measured results.The results show that the small UAV equipped with non-measuring cameras can meet the accuracy requirements of the height,area and perimeter for the forestry surveying,if the device could be adjusted and calibrated properly.And it,therefore,has broad prospects of application in forest investigation.

Key words: unmanned aerial vehicle, forestry investigation, non-measurement camera, tree height, forest area

CLC Number:

SUN Zhichao, YANG Xueqing, LI Chao. Application of Small Unmanned Aerial Vehicle with Non-measuring Camera in Forestry Investigation[J]. FOREST RESOURCES WANAGEMENT, 2017, (2): 103-109.

Figures/Tables 18

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相片编号	X	Y	Z	俯仰角/(°)	翻滚角/(°)	偏转角/(°)
97	116.1976	40.27053	161.859	-9.65787	-4.12509	-56.6643
98	116.1973	40.27066	162.1785	0.877586	-4.14206	-59.0013
99	116.197	40.27079	162.1795	1.437595	-3.94354	-59.1625
100	116.1967	40.27091	162.4428	1.71096	-4.80358	-59.8416
101	116.1972	40.27178	162.5796	-8.797	8.306279	100.8412
102	116.1973	40.27174	162.4786	-10.9482	5.650724	114.1948
103	116.1976	40.27161	161.9192	-10.237	2.264157	120.7199
104	116.1979	40.27149	162.0499	-6.50845	3.488942	121.5362
105	116.1981	40.27137	162.8858	-3.66217	1.527193	120.3655

序号	航区图测周长/m	航区图测面积/m²	控制点测周长/m	控制点测面积/m²	面积绝对误差/m²	面积相对误差/%	周长绝对误差/m	周长相对误差/%
1	396.7	10046.7	398.0	10172.7	-126.0	-1.24	-1.26	-0.32
2	212.6	2662.0	221.9	2927.4	-265.4	-9.07	-9.34	-4.21
3	167.7	1291.4	179.2	1619.8	-328.4	-20.27	-11.45	-6.39
4	192.7	1989.6	196.8	2159.9	-170.3	-7.88	-4.11	-2.09
5	275.2	4156.5	294.1	4833.7	-677.2	-14.01	-18.97	-6.45
6	212.9	1971.4	193.7	1688.5	282.8	16.75	19.23	9.93

实测树高/m	图测树高/m	绝对误差/m	相对误差/%
4.65	3.70	0.95	20.43
4.43	4.15	0.28	6.32
3.72	3.29	0.43	11.56
3.84	2.98	0.86	22.40
3.4	2.55	0.85	25.00
3.71	3.21	0.50	13.48
4.47	3.62	0.85	19.02
4.91	3.49	1.42	28.92
4.52	3.44	1.08	23.89
3.21	2.67	0.54	16.82
5.99	4.34	1.65	27.55
3.68	3.21	0.62	22.79
2.72	2.10	0.47	12.77
4.71	4.16	0.55	11.68
5.6	4.41	1.19	21.25

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