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.