Both layers of thermal zone and LGP zones were rasterized using
vector to raster module of Arc/Info. Both these raster based spatial
data bases were created at 1km grid size. Different intersections
and unions were the resultant of the overlaying of the two layers.
To finalize the layers redigitization of the intersection zones were
done and final zones were demarcated. This raster based spatial
database of Thermal_LGP zone was then imported into a separate
image channel using image processing software (PCI Geometica