TY - GEN
T1 - DTM generation using ground control points extracted from SAR image
AU - Park, Doo Youl
AU - Jung, Hyung Sup
AU - Hong, Sang Hoon
AU - Kim, Jin Kwang
PY - 2005
Y1 - 2005
N2 - Ground control points(GCPs) can be extracted from SAR data given precise orbit for DTM generation using optic images. In this study, we extract GCPs from ERS SAR data and SRTM DEM. Although it is very difficult to identify GCPs in ERS SAR image, the geometry of optic image is able to be corrected and more precise DTM can be constructed from stereo optic images. Twenty GCPs were obtained from the ERS SAR data with precise Delft orbit information. After the correction was applied, the mean values of planimetric distance errors of the GCPs were 3.7m, 12.1 and -0.8m with standard deviations of 19.9m, 18.1, and 7.8m in geocentric X, Y, and Z coordinates, respectively. The geometries of SPOT stereo pair were corrected by 13 GCPs, and r.m.s. errors were 4.5m, 7.5m and 8.6m in northing, easting and height direction, respectively. A DTM, through a method of area based matching with pyramid images, was generated by SPOT stereo images. Comparison between points of the obtained DTM and points estimated from a national 1:5,000 digital map was performed and the mean values of distance errors in northing, easting and height direction were respectively -7.6m, 9.6m and -3.1m with standard deviations of 9.1m, 12.0m and 9.1m. These results met the accuracy of DTED level 2.
AB - Ground control points(GCPs) can be extracted from SAR data given precise orbit for DTM generation using optic images. In this study, we extract GCPs from ERS SAR data and SRTM DEM. Although it is very difficult to identify GCPs in ERS SAR image, the geometry of optic image is able to be corrected and more precise DTM can be constructed from stereo optic images. Twenty GCPs were obtained from the ERS SAR data with precise Delft orbit information. After the correction was applied, the mean values of planimetric distance errors of the GCPs were 3.7m, 12.1 and -0.8m with standard deviations of 19.9m, 18.1, and 7.8m in geocentric X, Y, and Z coordinates, respectively. The geometries of SPOT stereo pair were corrected by 13 GCPs, and r.m.s. errors were 4.5m, 7.5m and 8.6m in northing, easting and height direction, respectively. A DTM, through a method of area based matching with pyramid images, was generated by SPOT stereo images. Comparison between points of the obtained DTM and points estimated from a national 1:5,000 digital map was performed and the mean values of distance errors in northing, easting and height direction were respectively -7.6m, 9.6m and -3.1m with standard deviations of 9.1m, 12.0m and 9.1m. These results met the accuracy of DTED level 2.
UR - http://www.scopus.com/inward/record.url?scp=33745698923&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:33745698923
SN - 0780390504
SN - 9780780390508
T3 - International Geoscience and Remote Sensing Symposium (IGARSS)
SP - 2254
EP - 2257
BT - 25th Anniversary IGARSS 2005
T2 - 2005 IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2005
Y2 - 25 July 2005 through 29 July 2005
ER -