Materials and Methods
1.2.1. Georeference of the Data:
The information in the raw remote sensing images has no relation to the real world coordinates. Georeference is a process that establishes the relation between row/column numbers and real world coordinates. Georeference tie points: specifying reference points in an image so that specific row/column numbers obtain a correct X, Y coordinate.
In this study, LISS III, ASTER images were georeferenced using the polyconic projections with Root Mean Square Error (RMS) of 0.345 and 0.325 respectively. MODIS and LANDSAT-7 ETM+ data was reprojected to Polyconic projections as the two data sets obtained were at Sinusoidal and UTM projections respectively. The projection details were given below:
| Projection Type: | Polyconic |
| Spheroid Name: | WGS 84 |
| Datum Name: | WGS 84 |
| Longitude of Central Meridian: | 93:03:19.335 E |
| Latitude of Origin of Projection: | 26:46:6.675 N |
| False Easting at Central Meridian: | 2000000 meters |
| False Northing at Origin: | 2000000 meters |