On Sat, Oct 25, 2014 at 4:09 PM, Andre Joost <[email protected]> wrote:
> Am 25.10.2014 um 07:05 schrieb Artur Bercik: > >> On Sat, Oct 25, 2014 at 2:00 PM, Andre Joost <[email protected]> >> wrote: >> >> Am 25.10.2014 um 06:03 schrieb Artur Bercik: >>> >>> Dear GDAL users >>>> >>>> I have a raster image of 406 lines and 270 samples with 5km pixel size. >>>> The >>>> center coordinates (lats and lons in degrees in GCS) of upper left >>>> pixel, >>>> and the center coordinates (lats and lons in degrees in GCS) of the >>>> lower >>>> right pixel are given, how can I calculate the coordinates of upper >>>> left >>>> corner (ulx and uly) and the coordinates of lower right corner (lrx and >>>> lry)? >>>> >>>> >>>> You need to know the projection definition to calculate from distance >>> in >>> pixel or km to degrees. >>> >>> >> yes the projection are in GCS with WGS84 datum >> >> > GCS has units of degrees, not kilometers. Your image is 2030x1350 km, but > you have to know if it is Mercator, Transverse Mercator, Lambert Coformal > Conical, Stereographic, Albers Equal Area, Sinusoidal or whatever. And you > have to know the origin of the projection, like Central meridian of UTM > projections. And if North is upwards or not. > > sorry, yes the pixel size are in degrees,0.047 deg.(5 km approx. at equator), in GCS and WGS84. > > Greetings, > André Joost > > > _______________________________________________ > gdal-dev mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/gdal-dev >
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