[postgis-users] SRTM Raster Geometry question
yvecai at gmail.com
Sun Mar 4 05:36:35 PST 2012
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.
> postgis-users mailing list
> postgis-users at postgis.refractions.net
Wouldn't that be a grid of 1°/1201 by 1°/1201 with 1201x1201 elevation
Just a guess.
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