Comprehensive CORS Enabled DGPS RTK based Survey of 79.5 acre land of WBIDC at Mouza- Andal JL No.-52 under Andal Block with 3nos. of bench mark piller marking allotted.

Scope of Work 1. Data Collection: a. Collection of certified LR/RS/CS cadastral maps from the West Bengal Land Records & Survey Department or other authorized government sources where such sheets are not available with the Authority. b. Ensuring that maps are complete, updated, and correspond to the correct mouzas, khatians, and jurisdictional boundaries under WBIDC. . Maintenance of proper documentation, receipts, and indexing of all obtained sheets. Creation of an inventory register of all acquired revenue maps for verification and record-keeping. d. Spl. L.A.O., Paschim Bardhaman will provide the plot number details of the land parcels. Sourcing of all other documents required for GIS mapping and GEO Database shall be the responsibility of the bidder. e. Delivery of combined Field Mapping Block maps with survey numbers of the identified site in DWG format (AutoCAD drawing-polyline with separate layers for each classification) and Excel/ CSV Format also. f. Survey observations will be carried out using survey-grade Trimble/Leica GNSS RTK (mandatory) equipment with centimeter-level accuracy to ensure precise and reliable survey results. 2. Digitization of LR/RS/CS Cadastral Maps : a. High-resolution scanning of hard-copy cadastral sheets (minimum 300–600 DPI), where digital copies are not available with the Authority. b. Digitization of plot boundaries, mouza boundaries, roads, water bodies, public properties, and other relevant cadastral features using standard GIS digitization techniques. c. Preparation of vector layers with appropriate topology rules to ensure no overlaps, gaps, or slivers. d. Assigning unique identifiers such as Mouza, JL No., plot number, khatian number, mouza code and LOP numbers. e. Web GIS based online Map viewing and layout printing facilities provide by agency. 3. Boundary Survey & Geo-referencing of maps : a. Geo-referencing the maps with the real-world coordinates to locate the boundary stone within the site. Delivery of Geo-reference maps in DWG (AutoCAD drawing-poly line) and GDB format. b. Differential Global Positioning System (DGPS) Survey - Ground Control Points (GCP) transfer. Minimum three Permanent Bench Markings reference points with permanent structure should be established according to the guidelines and standards set by Survey of India and validate the observation for a duration of 8 hours. c. Fixed features should be located such as boundary markers, i.e, utility infrastructure, roads or any physical features on the boundary. d. Ground Control Points (GCPs) and Check Points (CPs) i. To be established using dual-frequency DGPS/RTK equipment ensuring reliable positional accuracy. ii. Horizontal Accuracy of GCPs: ±2–3 cm. iii. Vertical Accuracy: ±3–5 cm. iv. GCPs shall be used to geo-reference the imagery, while CPs shall be used for independent accuracy verification. v. All points must be documented with photographs, coordinates, field logs, and marker sketches. vi. All Ground Control Points (GCPs) and Check Points (CPs) shall be connected to the nearest Survey of India (SOI) benchmark or Continuously Operating Reference Station (CORS) network to ensure superior positional accuracy and reliability of the project outputs. 4. Deliverables: a. Marking of all 1526 LOPs and future LOPs within the designated 79.5 acre of WBIDC land on the ground with lime (CHUNA MARKING) and final handing over of plots to beneficiaries of Land for Land scheme of JVDA agreement. b. Submission of Data Collection of LR Plots with corresponding CS & RS are to be submitted in .XLS/.CSV/.KMZ/.KML/.TIFF/.SHP format and Digitized Maps of the same to be submitted as well as clearly marked in the WEB-GIS. c. Overlay the converted Digitized maps onto LR MAP images including Plot Boundary Layout.d. Integration of Geo reference map with the ortho- image in GIS environment for generation of geo-referenced map layers from Ortho-image. e. Deliverable of physical features map of appropriate readable scale in Soft Copies (GDB format and DWG format) with area statement and detailed legend. The details are as follows: i. Site survey drawings with all physical features of the site ii. Approach roads, roads traversing through site and abutting roads. iii. Proposed infrastructure of road and drainage. f. Deliverable of base map for the project site in (CAD & GDP file format) in compatible with the Web-GIS with the following details: i. Site boundary with the Field Mapping sketches in Ortho Image as obtained from the Topographic Survey ii. Existing settlements in the vicinity and within the Site (if any) iii. Existing road network within and in the vicinity of the Site iv. Existing physical features in Ortho Image such as water bodies, streams, hills/hillocks, rocky areas, etc. v. Administrative boundaries of Mouza that fall within the Site g. The Authority will carry out sample checking of the deliverables to ensure the accuracy and quality of the images. The sample size will be determined by the Authority, however for all the samples checked by the Authority the positional accuracy, RMSE error should be within the defined threshold and the quality of the mosaicking in terms of seamless edge match and colour balancing should be satisfactory. The following checks will be verified and if required the Authority may include additional verification parameters. i. Manual checking of entire region of mono images to identify any gaps. ii. Checking of edge-matching between tiles and proper colour balancing, approved by the authority iii. Sample area checking for proper colour tone and texture. iv. During geo-referencing if any portion of images are stretched those tiles will be rejected. v. Seam line checking to ensure that it does not cross/cut important features. h. Final QC report verifying the accuracy and consistency of RoR data linked to the updated plot numbers.

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