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Title
Mapping without the sun
Author
Zhang, Jixian

270
Stdev.
12.75
13.92
11.83
15.05
RMSE
13.75
19.37
11.70
15.28
Table 2-1 the Geolocation accuracy of old version and new
version
Some points have poor geolocation accuracy because it is
difficult to choose the check points in the image according the
description of GPS station.
Figure 2-4 the points have poor geolocation accuracy
The 40 check points were divided into 4 groups with 14 points,
10 points, 8 points, and 8 points, and the altitude range of each
group was less than 50 meter, from 50 meter to 100 meter,
from 100 meter to 200 meter, and greater than 200 meter
respectively.
Altitude
Range
Number of
point
Old version
New version
RMSEx
RMSEy
RMSEx
RMSEy
<50
14
9.50
18.93
9.48
11.68
50-100
10
13.51
20.09
11.86
12.65
100-200
8
20.94
19.74
13.77
18.28
>200
8
15.04
23.75
15.43
23.17
40
13.92
19.62
11.85
15.47
RMSExy
24.06
19.49
Table 2-2 the geolocation accuracy of each group ( Unit Meter)
The following graph was drawn based on the data in table 2-1,
and we can see that the geolocation accuracy changing with the
altitude, and the geolocation accuracy in x direction is better
than it’s in y direction.
30
20
10
RMSEynew
InMSEy.otd
<50m 50-100m 100~200m >200m
Attitude range(m)
Figure 2-5 the relationship between the geolocation accuracy
and the altitude
3. CONCLUSION
Earth Remote Sensing Data Analysis Center had validated the
geometric accuracy of ASTER 3D ortho data. The target
images in Tsukuba and Yatsugatake had been used for
verification. The result of the geolocation accuracy is shown
below:
Tsukuba
Yatsugatake
Alon(m)
Alat(m)
Alon(m)
Alat(m)
Average
-15.7
-1.6
-27
11.6
Stdev.
6.4
6.2
8.7
11.7
RMSE
16.9
6.4
28.4
16.5
Table 3-1 the geolocation accuracy of ASTER 3D ortho
product in Tsukuba and Yarsugatake
The geolocation accuracy in the target image of Tsukuba is
better than that of in Yarsugatake. ERSDAC explained that the
large geolocation errors are due to an imperfect Earth nutation
correction in Level-1 processing are reported.
Series and basic requirements of digital topographic maps
constituted by China’s STATE BUREAU OF SURVEYING
AND MAPPING prescribes that the RMSE of a feature point
in chart to it’s nearest field control point may not exceed 0.5
mm in plain, and 0.75 mm in mountainous area on the 1:50,000
scale topographic map, in special difficult area the RMSE can
be extended 0.5 time according to the terrain class. On the
other words, the RMSE may not exceed 25m (0.5mm * 50,000 )
in plain and 37.5m (0.75mm * 50,000) in mountainous area.
The RMSE of ASTER 3D ortho product is smaller than 25m in
Beijing area, so it can satisfy the accuracy requirement of
1:50,000 scale topographic map.