ramaraju wrote on 09/06/2007 10:47 AM: > Hi, > I am working on a mineral potential mapping project using satellite, > ground geological, geophysical, geochemical data in the Mahabubnagar, > Nalgonda districts of Andhra Pradesh. I am using grass as a module in > the QGIS. When I checked the projections availble, I could not find > the modified everest datum of 1956.
GRASS uses the PROJ4 software which supports Everest 1956: cs2cs -le | grep -i everest evrst30 a=6377276.345 rf=300.8017 Everest 1830 evrst48 a=6377304.063 rf=300.8017 Everest 1948 evrst56 a=6377301.243 rf=300.8017 Everest 1956 evrst69 a=6377295.664 rf=300.8017 Everest 1969 evrstSS a=6377298.556 rf=300.8017 Everest (Sabah & Sarawak) The definition is also present in GRASS: GRASS 6.3.cvs (nc_spm_06):~ > grep -i ever $GISBASE/etc/ellipse.table # Everest 1830, India # everest a=6377276.345 e=.0066378466 everest "Everest 1830, India" a=6377276.345 f=1/300.8017 evrst30 "Everest 1830, India" a=6377276.345 f=1/300.8017 # Everest 1948, W. Malaysia and Singapore evrst48 "Everest 1948" a=6377304.063 f=1/300.8017 # Everest 1956, India evrst56 "Everest 1956, India" a=6377301.243 f=1/300.8017 # Everest 1969, W. Malaysia evrst69 "Everest 1969, W. Malaysia" a=6377295.664 f=1/300.8017 # Everest (Sabah & Sarawak), Brunei and E. Malaysia evrstss "Everest Sabah and Sarawak" a=6377298.556 f=1/300.8017 # Modified Everest (from elist.html from Peter H. Dana, cited from DMA 1987 # everest_m "Modified Everest" a=6377304.063 b=6356103.039 everest_m "Modified Everest" a=6377304.063 f=1/300.8017 # Everest (Pakistan) everest_p "Everest (Pakistan)" a=6377309.613 f=1/300.8017 When selecting the ellipsoid, use 'list' to get the list or enter directly 'evrst56'. > And also I could not > figure out the setting of coordinates to latitude and longitude. > Kindly help me in this regard > Please take a look at the available documentation: http://grass.itc.it/gdp/tutorials.php http://grass.itc.it/gdp/books.php Markus ------------------ ITC -> dall'1 marzo 2007 Fondazione Bruno Kessler ITC -> since 1 March 2007 Fondazione Bruno Kessler ------------------ _______________________________________________ grassuser mailing list [email protected] http://grass.itc.it/mailman/listinfo/grassuser
