Following this line, I'd like to know if anyone has already used the EarthEnv DEM data.
http://www.earthenv.org/DEM Thank you. 2017-09-21 16:22 GMT-03:00 Markus Metz <[email protected]>: > > > On Thu, Sep 21, 2017 at 7:47 PM, Laurent C. <[email protected]> wrote: > > > > > 2017-09-20 4:07 GMT-05:00 Markus Metz <[email protected]>: > > > > > > > > > On Tue, Sep 19, 2017 at 9:10 PM, Markus Metz < > [email protected]> > > > wrote: > > >> > > >> > > >> > > >> On Tue, Sep 19, 2017 at 5:53 PM, Laurent C. <[email protected]> wrote: > > >> > > > >> > Hello Markus, > > >> > > > >> > Thanks for your interest. > > >> > By SRTM1 we mean the 1 arcsecond version of SRTM. As far as we > know, it > > >> > comes in only one version. > > >> > > >> About USGS SRTM versions, see > > >> http://dx.doi.org/10.5067/MEaSUREs/SRTM/SRTMGL1.003 > > >> https://dds.cr.usgs.gov/srtm/What_are_these.pdf > > >> https://dds.cr.usgs.gov/srtm/version2_1/Documentation/SRTM_Topo.pdf > > >> > > >> the latter one states that "there is a difference between the data > > >> distributed via ftp from the Land Processes > > >> Distributed Active Archive Center [now https://dds.cr.usgs.gov/srtm/], > and > > >> those available from the EROS Data Center" > > >> > > >> I am not sure if this still holds true. Following the EarthExplorer > links > > >> https://lta.cr.usgs.gov/SRTMVF > > >> https://lta.cr.usgs.gov/SRTM1Arc > > >> > > >> it is not clear which versions these are. I guess the non-void filled > > >> version of the EarthExplorer is the subsampled version 2.1, the void > filled > > >> version and the global 1 arc sec version are SRTM version 3. Just a > guess, > > >> if in doubt, ask USGS. > > > > > > According to > > > https://lpdaac.usgs.gov/sites/default/files/public/measures/ > docs/NASA_SRTM_V3.pdf > > > and > > > https://lta.cr.usgs.gov/SRTM1Arc > > > > > > the USGS EarthExplorer most probably provides NGA version 2, not > JPL/NASA > > > versions 2.1 or 3. > > > > Markus, > > > > The JPL webpage about SRTM links to the USGS EROS website for > > download, which itself links to Earthexplorer: > > https://www2.jpl.nasa.gov/srtm/cbanddataproducts.html > > The JPL/NASA website also links to > http://dds.cr.usgs.gov/srtm/ > where you get the JPL/NASA SRTM products version 1 and 2.1 > > JPL/NASA SRTM version 3 (completely void-filled version 2.1) is available > at > https://lpdaac.usgs.gov/dataset_discovery/measures/measures_products_table > JPL/NASA version 3 with 1 arc second resolution is described at > https://lpdaac.usgs.gov/dataset_discovery/measures/ > measures_products_table/srtmgl1_v003 > JPL/NASA version 3 with 3 arc seconds resolution is described at > https://lpdaac.usgs.gov/dataset_discovery/measures/ > measures_products_table/srtmgl3_v003 > > Personally, I would prefer SRTM JPL/NASA version 3 over any other SRTM > version, mainly because according to the documentation it supersedes the > NGA version 2 available through the USGS EartExplorer. > > Markus M > > > https://eros.usgs.gov/elevation-products > > > > Do you know if there is a more recent version of the 1 arcsec product, > > and where to find it? > > > > Best, > > Laurent > > > > > > > > > Markus M > > >> > > >> > We could make it more clear during the revision. > > >> > > >> That would avoid confusion. For example, there is a 1 arc second > version > > >> of version 2.1 ;-) > > >> > > >> Markus M > > >> > > >> > > > >> > Best, > > >> > Laurent > > >> > > > >> > On 19 Sep 2017 01:49, "Markus Metz" <[email protected]> > > >> > wrote: > > >> > > > >> > > > >> > > > >> > On Tue, Sep 19, 2017 at 1:41 AM, Laurent C. <[email protected]> > wrote: > > >> > > > > >> > > Hello all, > > >> > > > > >> > > Open-access global DEMs like SRTM are a staple in our GIS > community. > > >> > > Last year the JAXA released a new product, the ALOS World 3d 30m > > >> > > (AW3D30). > > >> > > Using GRASS and itzï we've carried out an assessment of AW3D30 > from > > >> > > the point of view of flood modelling, and compared it to lidar, > SRTM > > >> > > and ASTER. > > >> > > > >> > Very interesting study! I have a question about SRTM: in the paper > you > > >> > write that you used SRTM version 1, but SRTM version 1 is > practically not > > >> > used since version 2.1 has been made available. Since 2013, SRTM > version 3 > > >> > has been available: > > >> > > > >> > http://dx.doi.org/10.5067/MEaSUREs/SRTM/SRTMGL1.003 > > >> > > > >> > SRTM version 3 is also the default for r.in.srtm.region. > > >> > > > >> > Best, > > >> > > > >> > Markus M > > >> > > > >> > > > > >> > > AW3D30 is indeed a very interesting product, and I thought that > GRASS > > >> > > users could be interested in our results: > > >> > > https://doi.org/10.5281/zenodo.885571 > > >> > > > > >> > > Best regards, > > >> > > Laurent > > >> > > _______________________________________________ > > >> > > grass-user mailing list > > >> > > [email protected] > > >> > > https://lists.osgeo.org/mailman/listinfo/grass-user > > >> > > > >> > > > > > > > _______________________________________________ > grass-user mailing list > [email protected] > https://lists.osgeo.org/mailman/listinfo/grass-user > -- *Maurício Humberto Vancine* Ecologist - Master Candidate in Zoology Spatial Ecology and Conservation lab - LEEC Department of Ecology - UNESP - Rio Claro-SP - Brazil LEEC <http://leec.eco.br/> | CV <http://lattes.cnpq.br/9761288418931193> | ResearchGate <https://www.researchgate.net/profile/Mauricio_Vancine> | GitHub <https://github.com/mauriciovancine> | ORCID <http://orcid.org/0000-0001-9650-7575?lang=en> | ResearcherID <http://www.researcherid.com/rid/F-7305-2016> | Google citations <https://scholar.google.com/citations?user=i-2xZBQAAAAJ>
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