Orthorectification of Stereo Spot Panchromatic and Radarsat Fine Mode Data using Orbital Parameters
and Digital Elevation Model
from SPOT data and 1 to 2 pixels for ERS SAR data. In the case of stereo SPOT, an accuracy of 10 m can be achieved (Al-Rousan et al., 1997 and Theodossiou & Dowman, 1990). Toutin (1998) also showed that stereo Radarsat data can produce DEM from various pair of modes and intersection angles with an accuracy of 25 m.
In this study, orbital parameters have been used with limited GCPs to carry out geometrical correction of SPOT Panchromatic and Radarsat Fine Mode SAR data together with DEM generated from the stereo SPOT data and stereo Radarsat Standard Mode SAR data.
2. Study Area and Satellite Data
2.1 Study area
The test site that has been selected for this study is the Klang Valley area, Malaysia, which covers an area of 60 km by 60 km (Figure 1). The selection of this site is due to the topography which ranges from flat, moderate and hilly areas.
Figure 1: Study area.
2.2 Satellite Data
The characteristics of the satellite data used in this study is given in Table 1. The base height ratio (B/H) value for SPOT stereo pair is 0.8. The value of vertical parallax ratio (VPR) calculated for the Radarsat stereo pair data acquired from the same side of Standard 2 and Standard 7 mode is 0.99.
