From Table 5, it is clear that the elevation accuracy of
stereo images can be improved dramatically after combined
adjustment with laser elevation control data. Furthermore, for
the four regions all of the results achieve to 3.0 m, or even 2.0
m. Moreover, only adding horizontal control data can improve
the planimetry accuracy only, and both the planimetry and
elevation error can be reduced after combining the horizontal
and laser elevation controls.
In the first and second experimental regions, where the
laser altimetry data and stereo images are captured synchro-
nously, the comparison result of the RSM_RC model is pro-
vided in Table 6. In the first experimental region, Weinan of
Shanxi, 16 laser points viewed as ranging constraints and 27
checkpoints were used to validate the results. In the second re-
gion, Kelamayi of Xinjiang, 11 laser points and 27 checkpoints
are used in the combined adjustment by RSM_RC model.
During the adjustment, different compensated types were
implemented as follows:
A. Compensate the attitude angles by offset parameters.
A1. Only compensate one attitude angle. A11 represents
the
φ
, A12 represents the
ω
, A13 represents the
κ
;
Table 5. Combined adjustment of
ZY3-02
satellite laser data and stereo images using
RFM_EC
.
Experimental region Different combinations
Number of
GCPs
Number of
CPs
RMS (m)
East
North
Planimetry
Elevation
Weinan of Shaanxi
No GCPs
0
27
11.311
6.516
13.053
11.542
5H5V
5
22
3.857
3.152
4.981
1.930
5H0V
5
22
3.328
2.547
4.192
10.135
0H16V
16
27
11.362
7.254
13.480
1.902
5H16V
21
22
3.833
3.347
5.089
1.954
Kelamayi of
Xinjiang
No GCPs
0
16
16.136
14.854
21.932
22.611
4H0V
4
12
3.208
2.748
4.225
21.745
0H11V
11
16
13.548
12.745
18.602
2.385
4H11V
15
12
3.163
2.765
4.201
2.052
Laiyuan of Shanxi
No GCPs
0
140
12.734
8.421
15.266
13.897
8H8V
8
132
2.471
2.902
3.811
1.954
8H0V
8
132
2.446
2.877
3.776
13.843
0H11V
11
140
11.768
3.122
12.175
2.169
8H11V
19
132
2.589
2.940
3.918
2.125
Suizhou of Hubei
No GCPs
0
48
7.409
2.199
7.728
9.265
11GLAS
11
48
6.462
2.261
6.846
2.998
13SLA
13
48
6.484
2.282
6.873
2.877
13SLA+11GLAS
24
48
6.399
2.289
6.797
2.598
8H24V
30
40
3.692
1.924
3.692
2.497
Table 6. Comparison of results of combined adjustment using
RFM_EC
and
RSM_RC
.
Experimental region Compensated type
Number of
GCPs
Number of
CPs
RMS (m)
East
North
Planimetry
Elevation
Weinan of Shaanxi
No GCPs
0
27
12.893
6.609
14.488
18.535
A11
16
27
11.311
6.516
13.053
3.226
A12
16
27
10.861
7.468
13.181
18.778
A13
16
27
11.872
7.462
14.022
18.827
A21
16
27
11.207
7.228
13.336
3.224
A22
16
27
14.314
5.110
15.199
3.914
A23
16
27
11.581
7.538
13.818
18.771
A3
16
27
11.362
7.254
13.480
3.078
B
16
27
11.427
7.476
13.655
3.015
Kelamayi of Xinjiang
No GCPs
0
16
16.987
8.320
18.915
20.631
A11
11
16
16.951
7.989
18.701
3.383
A12
11
16
16.407
8.053
18.277
21.261
A13
11
16
16.491
8.082
18.364
21.256
A21
11
16
7.571
4.449
8.782
3.137
A22
11
16
8.571
3.363
9.207
4.743
A23
11
16
7.451
4.606
8.760
21.342
A3
11
16
7.376
4.422
8.601
3.030
B
11
16
7.311
4.464
8.566
2.997
Figure 9. Accuracy validation of
ZY3-02
laser and image
combined adjustment using
GLAS
data. Black circle is the
GLAS
laser point and gray circle is the
ZY3-02
laser point.
576
September 2018
PHOTOGRAMMETRIC ENGINEERING & REMOTE SENSING
