Project Title:

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