Comments (8)
@sssangha can you provide some insight from ARIA-tools experience?
Might first generate a cropped vrt and then do a warp in mem on the cropped vrt?
Recall @bbuzz31 had some similar issue for the nlc map.
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I would recommend replacing the gdal.Warp
command (and wrpOpt
) with:
gdal.BuildVRT(memRaster, inRaster, outputBounds=[minlon, minlat, maxlon, maxlat])
This seems to increase the access speed, but when the array is read in utilFcns.gdal_open()
it will still take awhile for a large region.
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Thanks @bbuzz31 and @dbekaert I'll implement that change and push it to the repo!
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If you are not transforming map projections, using translate is going to be lot faster than warp
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Thanks @piyushrpt, we implemented the virtual raster and seems to be working well!
I just noticed though that the DEM we download is ellipsoidal heights; should we be doing an ellipsoidal correction as is done in ISCE?
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@jlmaurer see here for details open topogrpahy
SRTM GL1 (30m Ellipsoidal) is a version of the popular Shuttle Radar Topography Mission dataset where elevation values are WGS84 ellipsoidal height as opposed to the standard orthometric, or geoid-referenced, elevation.
This is correct as input for tropospheric delays estiamtion, and does not need any more correction. @piyushrpt can you confirm my statement?
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Will close it out, @piyushrpt let us know in care you disagree.
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