[gdal-dev] Retrieving 3DEP data via GDAL's WCS driver...

[TC Haddad]

Hi Carl,

Is it possible that you are just encountering the edges of the subdataset?

That URL you provided in your first email had the list of indexes for the
collection of data sets, maybe you can cross reference the shapes it was
showing with the edges you are getting, to see if you need to switch to a
different product when you are in certain areas:

http://www.arcgis.com/home/webmap/viewer.html?url=https%3A%2F%2Findex.nationalmap.gov%2Farcgis%2Frest%2Fservices%2F3DEPElevationIndex%2FMapServer&source=sd

Tanya

On Sat, Jun 13, 2020 at 5:28 PM Carl Godkin <cgodkin at gmail.com> wrote:

> Hi,
>
> This page https://viewer.nationalmap.gov/services/ includes a link under
> "WCS Services" that lists a number of subdatasets.  This command
>
> gdalnfo "
> https://elevation.nationalmap.gov/arcgis/services/3DEPElevation/ImageServer/WCSServer?request=GetCapabilities&service=WCS
> "
>
> works fine.  I have been retrieving elevation data from the first
> subdataset:
>
>   SUBDATASET_1_NAME=WCS:
> https://elevation.nationalmap.gov:443/arcgis/services/3DEPElevation/ImageServer/WCSServer?version=2.0.1&coverage=DEP3Elevation
>   SUBDATASET_1_DESC=DEP3Elevation
>
> and most of the time it works but I think I must be doing something wrong
> since sometimes there are large missing areas.
>
> For instance this area (Boston) works just fine:
>
> gdal_translate "WCS:
> https://elevation.nationalmap.gov:443/arcgis/services/3DEPElevation/ImageServer/WCSServer?version=2.0.1&coverage=DEP3Elevation"
> test.tif -projwin -71.07 42.36 -71.03 42.33 -projwin_srs EPSG:4326 -tr 100
> 100
>
> but this command with only a different "projwin" (in Colorado) is about
> 75% missing:
>
> gdal_translate "WCS:
> https://elevation.nationalmap.gov:443/arcgis/services/3DEPElevation/ImageServer/WCSServer?version=2.0.1&coverage=DEP3Elevation"
> test.tif -projwin -107.03 37.28 -107 37.25 -projwin_srs EPSG:4326 -tr 100
> 100
>
> Can anyone help me understand what I'm doing wrong here and how to fix
> it?
>
> I am using a very recent OSGeo4W featuring GDAL 3.0.4, released
> 2020/01/28.
>
> Thanks very much for your help,
>
> carl
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