[GRASS-user] Evaluation of AW3D30 open access global DEM for flood modelling

[Maurício Vancine]

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 <markus.metz.giswork at gmail.com>:

>
>
> On Thu, Sep 21, 2017 at 7:47 PM, Laurent C. <lrntct at gmail.com> wrote:
>
> >
> > 2017-09-20 4:07 GMT-05:00 Markus Metz <markus.metz.giswork at gmail.com>:
> > >
> > >
> > > On Tue, Sep 19, 2017 at 9:10 PM, Markus Metz <
> markus.metz.giswork at gmail.com>
> > > wrote:
> > >>
> > >>
> > >>
> > >> On Tue, Sep 19, 2017 at 5:53 PM, Laurent C. <lrntct at gmail.com> 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" <markus.metz.giswork at gmail.com>
> > >> > wrote:
> > >> >
> > >> >
> > >> >
> > >> > On Tue, Sep 19, 2017 at 1:41 AM, Laurent C. <lrntct at gmail.com>
> 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
> > >> > > grass-user at lists.osgeo.org
> > >> > > https://lists.osgeo.org/mailman/listinfo/grass-user
> > >> >
> > >> >
> > >
>
>
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-- 
*Maurício Humberto Vancine*
Ecologist - Master Candidate in Zoology
Spatial Ecology and Conservation lab - LEEC
Department of Ecology - UNESP - Rio Claro-SP - Brazil

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