Project Title:

Topographic Mapping of Jaldhaka Upazilla under Teesta Topographic Mapping of Jaldhaka Upazilla under Teesta CAD and Digital Elevation Model Development for flood CAD and Digital Elevation Model Development for flood

zoning and land use map for agriculture and urbanizationzoning and land use map for agriculture and urbanization

Presented by

Shahrior Al Mamun

Md. Humayun Karim

Bijoy Kumar Ghosh

Survey FeaturesSurvey Features

Roads, railways, flood embankments and other drainage divides

Alignments Spot height at Intervals not exceeding 300m.

Rivers and Drainage ChannelsAlignmentsX-Sections at Intervals of 500 - 1000m

Settlement areas- homestead/town boundariesBridges, culverts and regulators

GPS Location Detail Structural Information type/Dimension/Vents etc)

Water bodies, swamps and cultivable areasSpot heights on the land at roughly 100m Interval

Roads

RiverBeel

Railway

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

Concepts of Geodetic SurveyConcepts of Geodetic Survey

H

hN

EllipsoidEarth Surface

Geoid

N = h + H;

N = Geoid Height (from Geoid Model)

‘h = ellipsoid height ( GPS)

H = Orthometric height

World Geoid Model (WGSWorld Geoid Model (WGS-84-84))

Typical Bench Mark PillarTypical Bench Mark Pillar

Baseline Triangulation

Unknown valueUnknown Value

Known Value

RTK Base Line SurveyRTK Base Line Survey

Data collection by GPS for Line Data collection by GPS for Line featurefeature

Data collection by Total stationData collection by Total station

EquipmentEquipment

Total StationTotal Station Leveling MachineLeveling Machine

Digital LevelDigital LevelOptical LevelOptical Level

Digital Echo-sounder 2 nosDigital Echo-sounder 2 nos

Global Positioning System (GPS)Global Positioning System (GPS)Real Time Kinematic GPSReal Time Kinematic GPSProXR Data LoggerProXR Data LoggerDifferential GPSDifferential GPSHandheld GPSHandheld GPS

Communication SystemCommunication SystemWalkei Talkie Walkei Talkie VHFVHFSafecomSafecom

SoftwareSoftware

GPS Data ProcessingGPS Data ProcessingGP SurveyGP SurveyPath FinderPath Finder

GIS Geographic Information SystemGIS Geographic Information SystemPC Arc Info 7.1.2PC Arc Info 7.1.2ArcView 3.1ArcView 3.1

Avenue Programming for (IIS)Avenue Programming for (IIS)

General PurposeGeneral PurposeMicrosoft Office97 suitMicrosoft Office97 suit

Qbasic ProgrammingQbasic Programming

Spot Level at Random Spot Level at Random IntervalInterval

Topographic MapTopographic Map

Digital Elevation Model (DEM)Digital Elevation Model (DEM)

Flood Flood mapmap