Is the GLOBE DEM accessible in R via a package? I usually use raster::getData() when I need elev data but I need to sample a SPDF of a few thousand points with latitudes higher than the SRTM covers. Thoughts appreciated. -Andy
GLOBE DEM in R?
3 messages · Andy Bunn, Michael Sumner, Ben Tupper
The only available global DEM in an R package that I know is geomapdata which has Etopo5 (or equivalent) in it. Otherwise there is marmap with getNOAA.bathy() function, and I would look at xtractomatic as well for access to online services. I tend to keep Etopo1, Etopo2, GEBCO14, and a bunch of other non-global ones in local files since we use them intensively, and happy to help if you need guidance with any of those. There is IBCSO in polar form the southern hemisphere, but not sure if there's an equivalent for the north? Generally I go for the NetCDF version (either .nc or .grd) now that ncdf4 is fully supported by CRAN, otherwise use GeoTIFF if they provide it. Sometimes need some augmentation when reading with raster() to make sure things are interpreted fully/perfectly, but mostly it's pretty good. If there are other sources I'm keen to hear as well. Cheers, Mike.
On Thu, 10 Nov 2016 at 09:08 Andy Bunn <Andy.Bunn at wwu.edu> wrote:
Is the GLOBE DEM accessible in R via a package? I usually use
raster::getData() when I need elev data but I need to sample a SPDF of a
few thousand points with latitudes higher than the SRTM covers. Thoughts
appreciated.
-Andy
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Dr. Michael Sumner Software and Database Engineer Australian Antarctic Division 203 Channel Highway Kingston Tasmania 7050 Australia [[alternative HTML version deleted]]
Hi, You might give the Natural Earth topography a shake... https://github.com/BigelowLab/nearth I don't know how it compares to the ETOPO datasets. Cheers, Ben
On Nov 9, 2016, at 7:02 PM, Michael Sumner <mdsumner at gmail.com> wrote: The only available global DEM in an R package that I know is geomapdata which has Etopo5 (or equivalent) in it. Otherwise there is marmap with getNOAA.bathy() function, and I would look at xtractomatic as well for access to online services. I tend to keep Etopo1, Etopo2, GEBCO14, and a bunch of other non-global ones in local files since we use them intensively, and happy to help if you need guidance with any of those. There is IBCSO in polar form the southern hemisphere, but not sure if there's an equivalent for the north? Generally I go for the NetCDF version (either .nc or .grd) now that ncdf4 is fully supported by CRAN, otherwise use GeoTIFF if they provide it. Sometimes need some augmentation when reading with raster() to make sure things are interpreted fully/perfectly, but mostly it's pretty good. If there are other sources I'm keen to hear as well. Cheers, Mike. On Thu, 10 Nov 2016 at 09:08 Andy Bunn <Andy.Bunn at wwu.edu> wrote:
Is the GLOBE DEM accessible in R via a package? I usually use
raster::getData() when I need elev data but I need to sample a SPDF of a
few thousand points with latitudes higher than the SRTM covers. Thoughts
appreciated.
-Andy
[[alternative HTML version deleted]]
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-- Dr. Michael Sumner Software and Database Engineer Australian Antarctic Division 203 Channel Highway Kingston Tasmania 7050 Australia [[alternative HTML version deleted]]
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Ben Tupper Bigelow Laboratory for Ocean Sciences 60 Bigelow Drive, P.O. Box 380 East Boothbay, Maine 04544 http://www.bigelow.org