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The villages for reclamation were selected based on the following criteria:

1. The villages should have a high density of sodiclands, preferably more than 30% of geographical area
2. Average size of patches should be > 4ha (40000 sqm),
3. A main drain should be present near by preferably 0.5 – 1 km and
4. Quality of groundwater should be acceptable for irrigation.

Integration of thematic maps showing the information relevant to these criteria are being done manually. However, when integration has to be done on 1: 50,000 or at larger scale the process involves handling large number of maps in each district. Preparation of the required thematic maps on the same scale and overlaying is time consuming. With the advent of GIS, handling large amount of data of varied scales has become possible and data analysis faster. A GIS analysis procedure was developed and tested for one district Raebareli.

Study Area
The district Raebareli falls between latitudes 25° 45’ to 26° 45’and longitudes 80° 30’ to 81° 45’. The area is a part of Gangetic alluvium having gentle slopes.

Data Used
The village boundary map, drainage map from SOI toposheets and Sodic land map prepared using IRS satellite data during 1987 prepared on 1:50,000 scale were used. The EC, RSC in groundwater and Depth to Groundwater contour maps were collected from Central Groundwater Board, Lucknow (Singh 1988-89). These maps were implemented in Arc/Info GIS.

Methodology
All the maps were digitized, projected to polyconic projection and attribute information was added. The maps were then analyzed as indicated in the following flowchart:

Flow chart showing the process of integration and analysis of each layer in GIS

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