Yves, I am not sure I understand what you are saying..sorry. My question is basically if the points within a single cell can potentially have different elevation values because of interpolation? Or do all the points that lie within a cell get one elevation value?
On Sun, Mar 4, 2012 at 2:36 PM, yvecai <yve...@gmail.com> wrote: > ** > Le 04/03/2012 14:14, Ed Linde a écrit : > > Hi All, > Can someone help me understand a concept with the SRTM raster. My > understanding is that the raster can be thought of as a uniform grid with > each cell having dimension = "90m x 90m" (for SRTM-1 dataset). Now I am > just wondering if the elevation values are 4 values at each vertex or > boundary point of a cell? or is it one elevation value for the 90x90 m^2 > area covered by the cell? I ask because if its the first option, then it > would mean that every point that falls in the cell has it's elevation > calculated using some sort of interpolation between the 4 corner points of > the cell to arrive at this point's altitude. Or do several points that fall > into this 90x90 cell get assigned the same elevation value? > Would be great if I could get some help understanding this concept about > SRTM rasters. > > Cheers, > Ed > > > _______________________________________________ > postgis-users mailing > listpostgis-users@postgis.refractions.nethttp://postgis.refractions.net/mailman/listinfo/postgis-users > > Wouldn't that be a grid of 1°/1201 by 1°/1201 with 1201x1201 elevation > value? > Just a guess. > Yves > > _______________________________________________ > postgis-users mailing list > postgis-users@postgis.refractions.net > http://postgis.refractions.net/mailman/listinfo/postgis-users > >
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