STUP, one of the World Bank recognized Consultants has been assigned the task of preparation of Design and implementation of the 4-laning of the NH-55 erstwhile NH-42 in Odisha. SPARC assisted in carrying out the forest & environmental study of the National Highway segment from Cuttack to Sambalpur. The process involved collection of the revenue cadastral maps for the entire segment length, collection of record of right document from the concerned revenue authorities, consultation with the respective forest division offices for approval of the forest land involved within the segment 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. The DGPS survey and geo-referencing of the forest land was conducted with reference to the Principal Control Points established along the road corridor with reference to the ORSAC known points and through identification and DGPS observation of the permanent ground features of the revenue maps and geo-rectification of the cadastral sheets. The forest land was delineated from the geo-referenced revenue cadastral maps through desktop study and identification of the boundary change-point coordinates. The change point coordinates were used to stake-out the ground location for demarcation of the entry/ exit/ bend points within the involved Reserve Forest area.
The GIS/DGPS based environmental study of the National Highway segment helped in
- Precise identification of the boundary coordinates of the forest land involved in the National Highway Corridor for compliance measure to the MoEF
- Quick generation of the geo-referenced forest land map for the diverted forest land to be submitted to MoEF along with the Forest Diversion Proposal
High Resolution Satellite Imagery, Geographical Information System, Differential GPS survey, Database Management System