So If I have X,Y, Z numbers how do I select just that tile like mapserver does?
On Tue, Jan 14, 2020 at 10:09 PM Patrick Young < [email protected]> wrote: > One trick I like regarding accessing overview levels is to use the open > option to snag a handle direct to the overview level (see Even's post > http://erouault.blogspot.com/2014/10/warping-overviews-and-warped-overviews.html); > then you can run polygonize against a much smaller dataset. If it's a COG > presumably it has internal overviews. > > On Mon, Jan 13, 2020 at 12:22 PM Brian <[email protected]> wrote: > >> So I am not sure if this is the right place or not. Feel free to remove >> if it is not. >> >> The problem: I am needing to see if an extent (vector polygon, 4 >> vertices) has any interaction with a raster stored in the cog format. >> >> I thought about using raster_polygonize and running a intersect but that >> is going to be way too slow and I don't need the detail at which the raster >> is stored in. >> So I was thinking of some alternatives. >> Is there anyway to output just the polygon of the raster at a certain >> overview level? >> Is there any way to run intersects on a raster without converting it? >> I know I can retrieve the extent of the raster and quickly determine if >> an extent has any interaction with that raster extent. I also know that I >> can send points(x,y) and retrieve the value of the raster at that point is >> there any way to manipulate /game this? Maybe sending the extent as >> individual points with added points in between the vertices and just >> running multiple value at location operations? For my need, some false >> positives would be acceptable. If it helps raster data is of rivers and >> inundations. >> >> Has anyone else come up with some type of process for this? >> _______________________________________________ >> gdal-dev mailing list >> [email protected] >> https://lists.osgeo.org/mailman/listinfo/gdal-dev > >
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