Comparison between Plane and Stereo Block Adjustment for ZY-3 Satellite Images

doi:10.11947/j.JGGS.2018.0107

Abstract

Abstract:

Block adjustment for satellite images cannot be solved with weak convergence geometric conditions,therefore a plane block adjustment method to improve the targeting precision of images is proposed utilizing DEM as height constraint plane block adjustment method. First,a rational function model with affine transformation is selected as the mathematical model of the satellite image plane block adjustment. Second,to update the ground coordinates of tie points(TPs),the plane coordinates of TPs are only solved in the adjustment process. Elevation values are obtained by using DEM interpolation. Finally,the plane coordinates of all TPs and orientation parameters of all satellite images are solved through plane block adjustment with a few ground control points ZY-3 nadir images for two regions are tested for plane block adjustment while ZY-3 forward-nadir-back images of the same two regions are tested for stereo block adjustment. A comparison indicates that almost the same accuracy can be obtained with plane block adjustment support using a 1∶50000 DEM and stereo block adjustment for ZY-3 images. For ZY-3 nadir images,almost no loss of plane block adjustment accuracy occurred when global DEM with 1km grid and SRTM with 90 m grid replaced the 1∶50000 DEM as elevation control,. Test results demonstrate the effectiveness and feasibility of the plane block adjustment method.

Key words: ZY-3 satellite images; stereo block adjustment; plane block adjustment; accuracy

Taoyang WANG,Guo ZHANG,Deren LI,Wanshou JIANG,Xinming TANG,Xuelin LIU. Comparison between Plane and Stereo Block Adjustment for ZY-3 Satellite Images[J]. Journal of Geodesy and Geoinformation Science, 2018, 1(1): 53-60.

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Item	Qiqihar test area	Weinan test area
Nadir image resolution (m)	2.1	2.1
Forward and backward image resolution (m)	3.5×3.7	3.5×3.7
Number of tracks	5	3
GCPs	73	52
TPs	62	28
Maximum elevation (m)	300(plain and hill)	767(plain and mountain)

Test area	category	Scheme	GCPs	ICPs	Maximum residual/m				RMS error/m
Test area	category	Scheme	GCPs	ICPs	E	N	Plane	Elevation		E	N	Plane	Elevation
Qiqihar	stereo	Without GCPs	0	73	20.516	9.817	22.585	16.048	8.748		5.125	10.139	6.400
	stereo	With GCPs	12	61	7.531	8.125	8.319	7.911	2.806		3.172	4.235	3.366
	planar	Without GCPs	0	73	25.122	8.843	26.287	-	10.970		3.598	11.545	-
	planar	With GCPs	12	61	6.710	8.781	9.134	-	2.837		3.136	4.229	-
Weinan	stereo	Without GCPs	0	52	13.315	15.689	18.865	20.759	9.282		10.252	13.830	13.902
	stereo	With GCPs	9	43	6.218	7.130	7.159	6.861	3.317		2.967	4.450	2.622
	planar	Without GCPs	0	52	15.154	18.304	20.130	-	9.478		9.429	13.370	-
	planar	With GCPs	9	43	6.049	7.227	7.425	-	2.523		2.999	3.919	-

Test area	DEM grid	Scheme	GCPs	ICPs	Maximum residual/m			RMS error/m
Test area	DEM grid	Scheme	GCPs	ICPs	E	N	plane		E	N	plane
Qiqihar	90	Without GCPs	0	73	20.886	8.948	21.997	9.964		3.627	10.604
	90	With GCPs	12	61	6.992	8.781	9.134	2.626		3.111	4.071
	1000	Without GCPs	0	73	21.344	8.949	22.462	9.822		3.623	10.469
	1000	With GCPs	12	61	6.794	8.781	9.135	2.624		3.106	4.066
Weinan	90	Without GCPs	0	52	15.710	18.368	20.315	9.611		9.450	13.478
	90	With GCPs	9	43	5.953	7.227	7.439	2.485		3.010	3.903
	1000	Without GCPs	0	52	18.666	18.854	22.694	10.350		9.623	14.133
	1000	With GCPs	9	43	6.098	7.287	7.635	2.568		3.019	3.964