Use ofOpen Source

GIS & other softwarein

Project NGCM

Sanjay SinghGeologist (Jr.)

Used the software forQuick and accurate:

Creation of Drainage Map of the area. Demarcation of catchment area for every part

of the drainage. Overlaying of the toposheet, satellite imagery

and drainage map of the area. Creation of accurate sampling grid. Identification of sample location. Creation of present day landuse map of the

area. Visualizing the analytical data. Interpretation of the analytical data.

Data used

Survey of India Toposheet of the area.

Shuttle Radar Topographic Mission (SRTM) Elevation Data from USGS.

LANDSAT 7 Satellite imagery from USGS.

Multi-element Geochemical analytical results of the stream sediment samples from Chemical Division.

Open Source Softwares used

ILWIS 3.4

SCION IMAGE

IMAGE ANALYZER

INKSCAPE

OPENJUMP

Creation of Georeference for toposheet

DEM generated from SRTM data and overlain on the toposheet

Steps towards generation of drainage map from DEM

Drainage map of toposheet 45K/9 overlain on the toposheet

SRTM generated drainage of toposheet 45K/9 overlain on LANDSAT 7 satellite imagery

Catchment area for each segment of the drainage extracted from SRTM DEM

Creation of segments and polygonisation of grid for sampling

SRTM drainage, catchment area and grid overlain on satellite imagery and toposheet

of 45K/9

Landuse Map and the associated statistics