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

4. Concepts of Geodetic Survey H h N Ellipsoid Earth Surface Geoid 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. Baseline Triangulation Unknown value Unknown Value Known Value RTK Base Line Survey

8. Data collection by GPS for Line feature

9. Data collection by Total station

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

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