The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. Vol. XXXVII. Part Bl. Beijing 2008 
1340 
No. 
Scheme 
Control 
Points No. 
Check 
Points 
Description 
1 
0C-16K 
No 
All 
16poi 
nts 
16 checkpoints 
2 
16C-0K 
All 
16points 
No 
16 Control points 
3 
4C- 
12K.1 
01,07, 
09,15 
Other 
12 
points 
Four comer points as 
control points, and 
other 12 points as 
check points 
4 
4C- 
12K.2 
02,08, 
10,16 
Other 
12 
points 
Four side points as 
control points, and 
other 12 points as 
check points 
5 
4C- 
12K.3 
03,06, 
11,13 
Other 
12 
points 
Four center points as 
control points, and 
other 12 points as 
check points 
6 
12C- 
4K.1 
02,03,04, 
05,06,08, 
10,11,12, 
13,14,16 
01,07, 
09,15 
Four comer points as 
check points, and 
other 12 points as 
control points 
7 
12C- 
4K.2 
01,03,04, 
05,06,07, 
09,11,12, 
13,14,15 
02,08, 
10,16 
Four side points as 
check points, and 
other 12 points as 
control points 
8 
12C- 
4K.3 
01,02,04, 
05,07,08, 
09,10,11, 
12,14,16 
03,06, 
11,13 
Four center points as 
check points, and 
other 12 points as 
control points 
9 
8C-8K.1 
01,07,09, 
15,03,06, 
11,13 
Other 
8 
points 
Four comer points 
and four center 
points as control 
points, and other 8 
points as check 
points 
10 
8C-8K.2 
02,04,05, 
08,10,12, 
14,16 
Other 
8 
points 
Four line points and 
four center points as 
control points, and 
other 8 points as 
check points 
Table 2. GCPs and Check points number and distribution 
schemes 
Figure 3. 1:50,000 topographic map (partial) 
Figure 4. 12.5-meter DEM (partial) 
Figure 5. 2.5-meter Ortho-Image (partial) 
3.3 Experiment Results 
The results of different number and distribution of control 
points( table 3) show that: without ground control (16 check 
points) the planimetry and height accuracy of CARTOSAT-1 
stereo mapping is about 70-meter; using 16 control points the 
planimetry and height accuracy reach 5-meter; the accuracy of 
4 comer GCPs and 4 side GCPs is slightly better than 4 center 
GCPs; the accuracy is becoming stable when using more GCPs; 
in general the planimetry and height accuracy of CARTOSAT-1 
stereo mapping could reach 5-meter using high accurate ground 
control points. 
No 
Scheme 
Control Points 
Check Points 
Nor 
East 
Hei 
Nor 
East 
Hei 
th 
ght 
th 
ght 
1 
0C-16K 
72.6 
44.8 
74.6 
2 
16C-0K 
2.7 
2.9 
2.1 
3 
4C-12K.1 
2.4 
2.6 
1.4 
3.2 
3.0 
3.3 
4 
4C-12K.2 
2.9 
4.0 
2.4 
2.2 
2.0 
1.7 
5 
4C-12K.3 
1.1 
1.8 
0.4 
2.2 
4.5 
3.8 
6 
12C-4K.1 
2.7 
3.0 
1.8 
2.4 
3.6 
3.2 
7 
12C-4K.2 
2.9 
2.9 
2.2 
2.3 
3.2 
2 
8 
12C-4K.3 
3.0 
3.2 
2.1 
2.1 
1.3 
2.4 
9 
8C-8K.1 
3.1 
3.3 
2 
2.4 
2.6 
2.3 
10 
8C-8K.2 
2.1 
2.3 
2.2 
3.4 
3.5 
2.1 
Unit: meter