The advancement in digital image processing has provided additional tools such as data fusion or data merging. IHS to RGB transformation method is used for the fusion of two different sensor data. Spatial resolution of both PAN and LISS - III data are rounded off to 6 m and 23 m respectively for calculation of scale factor. As short wave infrared band with very coarse spatial resolution is not useful for mapping of infrastructure details hence band 1,2,3 are taken for fusing with PAN data. Other than infrastructure natural features such as reserve forest boundaries, drainage, water bodies, river islands, etc., are also digitized to study the changes occurred in last 30 to 35 years.
Separate layer is prepared for each feature with assigning proper attributes.
During the process of updation, it has been experienced that some features that are linear in nature can be updated using single band PAN data. But complexity arises when features are non-linear and there is possibility of mixing with other features. Whereas fused data offers more shades of color and enable the interpreter to separate out subtle differences in objects because of change in color tone. This site is best viewed with Internet Explorer 4.0 and above, at display settings of 800X600 pixels GISdevelopment.net. All rights reserved.