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RFP for ANAND & other Seven DISTRICTS Resurvey project towers ,high frequency dish antennas, radars, jammers, etc which interferes with GPS signals , should be strictly avoided . ii. Densification: 16 Km average iii. Instrument to be used :Primary Control points shall be identified with DGPS iv. Accuracy levels required: 1:50000. v. Monumentation of Primary Control Points: a. Rock Stone or Sand Stone 30*30*75 cm or RCC. b. The control point should be 15 cm above the ground and 60 cm inside the ground. c. The control points should be fixed to the ground using at least 15cm of cement block d. Monuments shall bear a Triangle on top with plummet hole in the middle. Monumentation can be done by engraving the control points by 1 “ dia circle. e. Provision to put GPS reading strip of granite. f. The control point number should be inscribed on the monument. Vertical All the primary control points should be connected by spirit level heights. The leveling lines for such connections should be terminate at a precision control points of the SOI and all errors adjusted within them. Permissible error for leveling line 0.025 ♪k ( in meters), where the length of leveling line in km. 2. Secondary Control Points: i. What kind of places: In protected areas like premises of Government buildings and other protected structures, Village Tri-junction points, village Bi-junctions etc. ii. GCP Selection criteria : The selection criteria of points should be a)GCP should be easily identifiable on aerial imagery as well as on the ground. b) GCP should be a sharp points on image and ground. c) The selected GCP shall be open and clear to sky, without any obstruction to the sky. All secondary points should be post pointed on digitised village map preferably in soft copy. If the post pointing on hard copy is to be done , the control points should be post pointed at a given distances . In addition , a sketch of control points and their detailed description should be prepared on the ground. iii. Densification : 4 km average iv. Instrument to be used: DGPS. v. Accuracy levels required: 1:20000 vi. Monumentation of Secondary Control Points: 2/22/2011 38
RFP for ANAND & other Seven DISTRICTS Resurvey project a. Rock Stone or Sand Stone 23*23*75 cm or RCC b. The control point should be 15 cm above the ground and 60 cm inside the ground. c. The control points should be fixed to the ground using at least 15cm of cement block d. Monuments shall bear a Triangle on top with plummet hole in the middle . Monumentation can be done by engraving the control points by 1 “ dia circle. e. Provision to put GPS reading strip of granite. f. The control point number should be inscribed on the monument. g. X, Y and Z co-ordinates are required. 3. Tertiary Control Points: i. What kind of places: Preferred places area Village boundary tri-junction or bijunction, Government lands etc., Field tri-junction on village boundaries or inside the village. Existing Govt/ non-Govt buildings like GP office, school building, veterinary hospital, high tension lines etc. ii. Densification: 1 km average iii. Instrument: DGPS/ETS iv. Accuracy levels required : 1 in 10,000 v. Monumentation of Tertiary Control Points a. Rock Stone or Sand Stone 15*15*45 cm or RCC b. The control point should be 10 cm above the ground and 35 cm inside the ground. c. The control points should be fixed to the ground using at least 15cm of cement block d. Monuments shall bear a Triangle on top with plummet hole in the middle . Monumentation can be done by engraving the control points by 1 “ dia circle. e. Provision to put GPS reading strip of granite. f. The control point number should be inscribed on the monument. 4. Auxiliary Control Point: What kind of places: Each control point (Primary, Secondary and Tertiary Control Points) shall be accompanied with one auxiliary control point. It should be located on permanent structure like bridges, culverts and other permanent building corners etc. The auxiliary control point should be within the line of sight from the control points i. Densification: There shall be one auxiliary point for each control point typically 200m or more (Primary, Secondary and Tertiary control point) ii. Instrument: DGPS and ETS 39 2/22/2011
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