That makes sense, thanks! Jeremy
On Thu, Aug 6, 2009 at 3:36 PM, Frank Warmerdam<[email protected]> wrote: > jeremy pierre wrote: >> >> Hi all, >> >> Apologies if this is an extremely newbie-ish post but here goes: >> >> I'm working(to scratch an itch) on a library and utility in Scala to >> import USGS format DEM files into PostGIS as points(probably >> multipoints really). I'm working with the CDED files from geobase.ca >> at present and the quadrangle coordinates are all laid out in >> arc-seconds. The question is: for the x and y coordinates of each >> elevation point would it be better(across the board, given various >> types of DEM data) to keep points as lat/long floats(convert from the >> arc seconds) or stick to arc-seconds as a standard unit for importing? >> Anyone care to weigh in on this? >> >> Again, apologies if I'm being a terrible newbie... > > Jeremy, > > My position would be that you are better off converting from arcseconds > to decimal degrees as it gives you the opportunity to use the reprojection > mechanisms of PostGIS if you want. The PostGIS transform code does not > understand geographic (angular) units other than decimal degrees. > > Best regards, > -- > ---------------------------------------+-------------------------------------- > I set the clouds in motion - turn up | Frank Warmerdam, > [email protected] > light and sound - activate the windows | http://pobox.com/~warmerdam > and watch the world go round - Rush | Geospatial Programmer for Rent > > _______________________________________________ > postgis-users mailing list > [email protected] > http://postgis.refractions.net/mailman/listinfo/postgis-users > _______________________________________________ postgis-users mailing list [email protected] http://postgis.refractions.net/mailman/listinfo/postgis-users
