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Project Title:

Project Title: Topographic Mapping of Jaldhaka Upazilla under Teesta CAD and Digital Elevation Model Development for flood zoning and land use map for agriculture and urbanization. Presented by Shahrior Al Mamun Md. Humayun Karim Bijoy Kumar Ghosh. Survey Features.

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Project Title:

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  1. Project Title: Topographic Mapping of Jaldhaka Upazilla under Teesta CAD and Digital Elevation Model Development for flood zoning and land use map for agriculture and urbanization Presented by Shahrior Al Mamun Md. Humayun Karim Bijoy Kumar Ghosh

  2. Survey Features • Roads, railways, flood embankments and other drainage divides Alignments Spot height at Intervals not exceeding 300m. Rivers and Drainage Channels Alignments X-Sections at Intervals of 500 - 1000m Settlement areas- homestead/town boundaries Bridges, culverts and regulators GPS Location Detail Structural Information type/Dimension/Vents etc) Water bodies, swamps and cultivable areas Spot heights on the land at roughly 100m Interval Roads River Beel Railway

  3. Base Line Survey by RTK-GPS Fly Levelling Survey by Optical Level Establishment of Geodetic Values of BMs (Lat, Long, Ell. height) Establishment of Local Datum to BMs (mPWD) Application of World Geoid Model Development of Local Geoid Model Temporary Control Points (Lat, Long, Ell. Height) by RTK-GPS Temporary Control Point (Northing, Easting, RL)

  4. Concepts of Geodetic Survey Ellipsoid Earth Surface N h Geoid H N = h + H; N = Geoid Height (from Geoid Model) ‘h = ellipsoid height ( GPS) H = Orthometric height

  5. World Geoid Model (WGS-84)

  6. Typical Bench Mark Pillar

  7. RTK Base Line Survey Baseline Triangulation Unknown value Unknown Value Known Value

  8. Data collection by GPS for Line feature

  9. Data collection by Total station

  10. Equipment  Global Positioning System (GPS) Real Time Kinematic GPS ProXR Data Logger Differential GPS Handheld GPS  Total Station • Leveling Machine • Digital Level • Optical Level • Digital Echo-sounder 2 nos • Communication System • Walkei Talkie • VHF • Safecom

  11. Software  GPS Data Processing GP Survey Path Finder • GIS Geographic Information System • PC Arc Info 7.1.2 • ArcView 3.1 • Avenue Programming for (IIS) • General Purpose • Microsoft Office97 suit • Qbasic Programming

  12. Spot Level at Random Interval

  13. Topographic Map

  14. Digital Elevation Model (DEM)

  15. Flood map

  16. THANK YOU

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