bids are invited for gis related survey services - asset/point of interest; cross section; 1:500; hydrological survey; dwg, cad format (dxf/dwg) cross-sectional survey of rivers at bridges locations for adequacy of rail & road bridges located in the reach from rudraprayag to badrinath river cross section survey and preparation of maps in requisite scales to supply them in both soft and hard formats with four copies complete, including cost of manpower, labour, surveying instruments, camp equipage, transportation, etc, as per directions of engineer-in-charge. 30.00 location cross section of river (including bathymetry/ underwater, topography survey) by using dgps, total station, echo sounder, sounding rod, wading/ boat ) (1) at bridge location, (2) upstream and (3) downstream location at a distance of 100 m from bridge (total cross-section length between 100 to 1000 m) . rd should be measured starting from left bank & should cover hfl or top level of embankment/firm bank on both banks. r.d in general should be at an interval of 1 m or as per directions of engineer-in-charge. first and last r.d. of all cross sections should have latitude and longitude. all level should be in terms of r.l wrt msl. all measurements at each point must be captured at site. data from pre existing dem & contour, satellite data, regenerated, or interpolated sources should not be used in preparation of cross-section total quantity :