Tata Steel Limited has been allotted a coal block in the West Bokaro mining region of the Ramgarh district in Jharkhand state. SPARC was assigned the task of development of an integrated spatial information system for the coal block. The process involved collection of the revenue cadastral maps for the industrial area, collection of record of right document for the concerned villages, consultation with the respective forest division offices for approval of the forest land involved within the mine lease area and preparation of the forest land schedule. GIS based processing of the input documents were carried out through grid correction/ digitization/ mosaicking of the revenue maps and the forest land schedule and linking the data sets through the key field to generate the spatial land database for the forest land. High Resolution Satellite Image (Panchromatic + Multispectral) was procured for the SEZ area and processed to obtain the merged imagery to facilitate delineation of the ground features as well as the vegetation type and density in the proposed area. The image interpretation study was conducted to current land use pattern to obtain current status of the land. The GIS database of the lease area boundary and the forest land involved within the leased coal block area covering DGPS survey and geo-referencing of the forest land was conducted with reference to the Principal Control Points (PCP) established within the industrial area through 72hr observation of the dual frequency DGPS device. The lease boundary observations were taken with reference to the PCP. Secondary Control Points in the revenue cadastral maps were obtained and through identification and DGPS observation of the permanent ground features of the revenue maps and geo-rectification of the revenue cadastral map sheets. Post-processing of the simultaneous observation recordings of the PCP as well as the SCPs were carried out though the post-processing utility software for delineation of the forest land. Desk study and identification of the boundary change-point coordinates of the forest land were carried out. The change point coordinates were used to stake-out the ground location for demarcation of the forest area within the lease boundary. The geo-spatial data sets were organized in thematic data layers, lease boundary data layer, forest boundary data layers along with the administrative base map layers and integrated in a GIS application to facilitate visualization of the project boundary, villages involved, plots involved within the SEZ area, plot information related to each plots such as plot no, land type, ownership details etc. The application provides the GIS tool bar with common GIS functionalities as well as query and analysis through provision of a query builder.
The GIS based integrated spatial information system helped in
- Land Information system for mine planning and decision support in mine operation
- Compliance to the MoEF through geo-referencing of forest land map for the diverted forest land
- Compliance to Supreme Court guide line regarding preparation of a comprehensive mining GIS database
High Resolution Satellite Imagery, Geographical Information System, Differential GPS survey, Database Management System