24 - 25 October 2002, India International Centre, New Delhi, India
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GPS for geometric correction of remotely sensed imagery: possibilities after termination of SA



Fig. 1 Spatial distribution of selected GPS observation stations.


Fig. 2 Deviation of GPS observed coordinates: eastings, northings and height above ellipsoid (H) at station no.1 for observations taken on different dates.

Table 1 Details of remotely sensed imagery used for geometric correction.
Area Satellite and sensor Imaging date Path and row
Kanpur IRS-1D, PAN 22-04-2002 99/53


Fig. 3 Standard deviation of GPS observed coordinates: eastings, northings and height above ellipsoid (H) at different stations.


Fig. 4 Difference in GPS measured and total station measured distances between different stations.

Table 3 RMS error and number of GCPs used in the geometric correction of IRS-1D, PAN imagery

Area Satellite and sensor Imaging date Path and row
Kanpur IRS-1D, PAN 22-04-2002 99/53

Table 2 Distances measured by GPS and total station, between IITK stations.
Distance between stations Distance measured by total station (m) Distance computed from GPS observations (m) Difference between total station and GPS distances (m)
1 and 2 594.58 598.31 -3.73
1 and 3 467.45 470.28 -2.83
1 and 4 504.30 500.33 3.97
1 and 5 200.54 200.01 0.53
3 and 6 438.85 439.36 -0.51
3 and 7 316.56 315.11 1.45

Table 4 Error at test GCPs in terms of image pixels.
Test GCP no. Error in GCP row (pixel) Error in GCP column (pixel)
1 -3.08 0.67
2 1.02 1.01
3 -3.83 0.89
4 3.79 0.54
5 -0.63 -0.86
6 0.51 -0.22
7 -0.40 -2.24
8 1.66 1.68
9 -0.23 -0.66
10 -0.50 2.27

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