<div dir="ltr"><div class="gmail_default"><font face="monospace, monospace" size="4">Following this line, I'd like to know if anyone has already used the EarthEnv DEM data.</font><br></div><div class="gmail_default"><font face="monospace, monospace" size="4"><br></font></div><div class="gmail_default"><font face="monospace, monospace" size="4"><a href="http://www.earthenv.org/DEM">http://www.earthenv.org/DEM</a><br></font></div><div class="gmail_default"><font face="monospace, monospace" size="4"><br></font></div><div class="gmail_default"><font face="monospace, monospace" size="4">Thank you.</font></div></div><div class="gmail_extra"><br><div class="gmail_quote">2017-09-21 16:22 GMT-03:00 Markus Metz <span dir="ltr"><<a href="mailto:markus.metz.giswork@gmail.com" target="_blank">markus.metz.giswork@gmail.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div><div><div><br><br>On Thu, Sep 21, 2017 at 7:47 PM, Laurent C. <<a href="mailto:lrntct@gmail.com" target="_blank">lrntct@gmail.com</a>> wrote:<div><div class="h5"><br>><br>> 2017-09-20 4:07 GMT-05:00 Markus Metz <<a href="mailto:markus.metz.giswork@gmail.com" target="_blank">markus.metz.giswork@gmail.com</a><wbr>>:<br>> ><br>> ><br>> > On Tue, Sep 19, 2017 at 9:10 PM, Markus Metz <<a href="mailto:markus.metz.giswork@gmail.com" target="_blank">markus.metz.giswork@gmail.com</a><wbr>><br>> > wrote:<br>> >><br>> >><br>> >><br>> >> On Tue, Sep 19, 2017 at 5:53 PM, Laurent C. <<a href="mailto:lrntct@gmail.com" target="_blank">lrntct@gmail.com</a>> wrote:<br>> >> ><br>> >> > Hello Markus,<br>> >> ><br>> >> > Thanks for your interest.<br>> >> > By SRTM1 we mean the 1 arcsecond version of SRTM. As far as we know, it<br>> >> > comes in only one version.<br>> >><br>> >> About USGS SRTM versions, see<br>> >> <a href="http://dx.doi.org/10.5067/MEaSUREs/SRTM/SRTMGL1.003" target="_blank">http://dx.doi.org/10.5067/<wbr>MEaSUREs/SRTM/SRTMGL1.003</a><br>> >> <a href="https://dds.cr.usgs.gov/srtm/What_are_these.pdf" target="_blank">https://dds.cr.usgs.gov/srtm/<wbr>What_are_these.pdf</a><br>> >> <a href="https://dds.cr.usgs.gov/srtm/version2_1/Documentation/SRTM_Topo.pdf" target="_blank">https://dds.cr.usgs.gov/srtm/<wbr>version2_1/Documentation/SRTM_<wbr>Topo.pdf</a><br>> >><br>> >> the latter one states that "there is a difference between the data<br>> >> distributed via ftp from the Land Processes<br>> >> Distributed Active Archive Center [now <a href="https://dds.cr.usgs.gov/srtm/" target="_blank">https://dds.cr.usgs.gov/srtm/</a>]<wbr>, and<br>> >> those available from the EROS Data Center"<br>> >><br>> >> I am not sure if this still holds true. Following the EarthExplorer links<br>> >> <a href="https://lta.cr.usgs.gov/SRTMVF" target="_blank">https://lta.cr.usgs.gov/SRTMVF</a><br>> >> <a href="https://lta.cr.usgs.gov/SRTM1Arc" target="_blank">https://lta.cr.usgs.gov/<wbr>SRTM1Arc</a><br>> >><br>> >> it is not clear which versions these are. I guess the non-void filled<br>> >> version of the EarthExplorer is the subsampled version 2.1, the void filled<br>> >> version and the global 1 arc sec version are SRTM version 3. Just a guess,<br>> >> if in doubt, ask USGS.<br>> ><br>> > According to<br>> > <a href="https://lpdaac.usgs.gov/sites/default/files/public/measures/docs/NASA_SRTM_V3.pdf" target="_blank">https://lpdaac.usgs.gov/sites/<wbr>default/files/public/measures/<wbr>docs/NASA_SRTM_V3.pdf</a><br>> > and<br>> > <a href="https://lta.cr.usgs.gov/SRTM1Arc" target="_blank">https://lta.cr.usgs.gov/<wbr>SRTM1Arc</a><br>> ><br>> > the USGS EarthExplorer most probably provides NGA version 2, not JPL/NASA<br>> > versions 2.1 or 3.<br>><br></div></div>> Markus,<br>><br>> The JPL webpage about SRTM links to the USGS EROS website for<br>> download, which itself links to Earthexplorer:<br>> <a href="https://www2.jpl.nasa.gov/srtm/cbanddataproducts.html" target="_blank">https://www2.jpl.nasa.gov/<wbr>srtm/cbanddataproducts.html</a><br><br></div>The JPL/NASA website also links to<br><a href="http://dds.cr.usgs.gov/srtm/" target="_blank">http://dds.cr.usgs.gov/srtm/</a><br></div>where you get the JPL/NASA SRTM products version 1 and 2.1<br><br></div>JPL/NASA SRTM version 3 (completely void-filled version 2.1) is available at<br><a href="https://lpdaac.usgs.gov/dataset_discovery/measures/measures_products_table" target="_blank">https://lpdaac.usgs.gov/<wbr>dataset_discovery/measures/<wbr>measures_products_table</a><br></div>JPL/NASA version 3 with 1 arc second resolution is described at <br><div><a href="https://lpdaac.usgs.gov/dataset_discovery/measures/measures_products_table/srtmgl1_v003" target="_blank">https://lpdaac.usgs.gov/<wbr>dataset_discovery/measures/<wbr>measures_products_table/<wbr>srtmgl1_v003</a><br></div><div>JPL/NASA version 3 with 3 arc seconds resolution is described at <br><a href="https://lpdaac.usgs.gov/dataset_discovery/measures/measures_products_table/srtmgl3_v003" target="_blank">https://lpdaac.usgs.gov/<wbr>dataset_discovery/measures/<wbr>measures_products_table/<wbr>srtmgl3_v003</a></div><div><br></div><div>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.</div><div><br></div><div>Markus M<br></div><div><div><div><div><br>> <a href="https://eros.usgs.gov/elevation-products" target="_blank">https://eros.usgs.gov/<wbr>elevation-products</a><br>><br>> Do you know if there is a more recent version of the 1 arcsec product,<br>> and where to find it?<br>><br>> Best,<br>> Laurent<div><div class="h5"><br>><br>> ><br>> > Markus M<br>> >><br>> >> > We could make it more clear during the revision.<br>> >><br>> >> That would avoid confusion. For example, there is a 1 arc second version<br>> >> of version 2.1 ;-)<br>> >><br>> >> Markus M<br>> >><br>> >> ><br>> >> > Best,<br>> >> > Laurent<br>> >> ><br>> >> > On 19 Sep 2017 01:49, "Markus Metz" <<a href="mailto:markus.metz.giswork@gmail.com" target="_blank">markus.metz.giswork@gmail.com</a><wbr>><br>> >> > wrote:<br>> >> ><br>> >> ><br>> >> ><br>> >> > On Tue, Sep 19, 2017 at 1:41 AM, Laurent C. <<a href="mailto:lrntct@gmail.com" target="_blank">lrntct@gmail.com</a>> wrote:<br>> >> > ><br>> >> > > Hello all,<br>> >> > ><br>> >> > > Open-access global DEMs like SRTM are a staple in our GIS community.<br>> >> > > Last year the JAXA released a new product, the ALOS World 3d 30m<br>> >> > > (AW3D30).<br>> >> > > Using GRASS and itzï we've carried out an assessment of AW3D30 from<br>> >> > > the point of view of flood modelling, and compared it to lidar, SRTM<br>> >> > > and ASTER.<br>> >> ><br>> >> > Very interesting study! I have a question about SRTM: in the paper you<br>> >> > write that you used SRTM version 1, but SRTM version 1 is practically not<br>> >> > used since version 2.1 has been made available. Since 2013, SRTM version 3<br>> >> > has been available:<br>> >> ><br>> >> > <a href="http://dx.doi.org/10.5067/MEaSUREs/SRTM/SRTMGL1.003" target="_blank">http://dx.doi.org/10.5067/<wbr>MEaSUREs/SRTM/SRTMGL1.003</a><br>> >> ><br>> >> > SRTM version 3 is also the default for r.in.srtm.region.<br>> >> ><br>> >> > Best,<br>> >> ><br>> >> > Markus M<br>> >> ><br>> >> > ><br>> >> > > AW3D30 is indeed a very interesting product, and I thought that GRASS<br>> >> > > users could be interested in our results:<br>> >> > > <a href="https://doi.org/10.5281/zenodo.885571" target="_blank">https://doi.org/10.5281/<wbr>zenodo.885571</a><br>> >> > ><br>> >> > > Best regards,<br>> >> > > Laurent<br>> >> > > ______________________________<wbr>_________________<br>> >> > > grass-user mailing list<br>> >> > > <a href="mailto:grass-user@lists.osgeo.org" target="_blank">grass-user@lists.osgeo.org</a><br>> >> > > <a href="https://lists.osgeo.org/mailman/listinfo/grass-user" target="_blank">https://lists.osgeo.org/<wbr>mailman/listinfo/grass-user</a><br>> >> ><br>> >> ><br>> ><br><br></div></div></div></div></div></div></div>
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<a href="https://lists.osgeo.org/mailman/listinfo/grass-user" rel="noreferrer" target="_blank">https://lists.osgeo.org/<wbr>mailman/listinfo/grass-user</a><br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div><div style="text-align:left"><b style="line-height:15px;font-family:monospace,monospace"><font size="4" color="#38761d">Maurício Humberto Vancine</font></b><b style="line-height:15px;font-family:monospace,monospace;font-size:small"><font color="#0c343d"> </font><font color="#000000"><img src="https://docs.google.com/uc?id=0B77ierzIr9LrYUd3N3BkdkNoMXM&export=download"></font></b><br></div><font face="monospace, monospace" size="2" color="#38761d"><div style="text-align:left"><font face="monospace, monospace" size="2"><span style="line-height:15px">Ecologist - Master Candidate </span></font><font face="monospace, monospace" size="2"><span style="line-height:15px">in Zoology </span></font></div></font></div><div style="text-align:left;line-height:15px;background-color:transparent"><font color="#38761d"><span style="font-family:monospace,monospace;font-size:small;line-height:normal;background-color:transparent">Spatial Ecology and Conservation lab - LEEC</span><br></font></div><div style="background-color:transparent"><font face="monospace, monospace" size="2"><div style="text-align:left;background-color:transparent"><font color="#38761d">Department of Ecology - UNESP - Rio Claro-SP - Brazil</font></div><div style="color:rgb(0,0,0);background-color:transparent"><br></div></font></div><div style="text-align:left;line-height:15px"><span style="font-size:12.8px;color:rgb(0,0,0)"><font color="#000000" style="font-family:monospace,monospace;font-size:small;line-height:normal"><span style="line-height:15px"><a href="http://leec.eco.br/" target="_blank">LEEC</a> </span></font><span style="font-size:12.8px;line-height:normal;color:rgb(34,34,34)">| </span><a href="http://lattes.cnpq.br/9761288418931193" style="font-family:monospace,monospace;font-size:small" target="_blank">CV</a> | <a href="https://www.researchgate.net/profile/Mauricio_Vancine" style="font-family:monospace,monospace;font-size:small" target="_blank">ResearchGate</a><span style="font-size:12.8px"> | </span></span><font color="#000000" style="font-size:12.8px"><a href="https://github.com/mauriciovancine" target="_blank">GitHub</a></font><span style="font-size:12.8px;color:rgb(0,0,0)"><span style="font-size:12.8px"> </span></span><span style="font-size:12.8px;color:rgb(0,0,0)">| </span><a href="http://orcid.org/0000-0001-9650-7575?lang=en" style="color:rgb(17,85,204);line-height:normal;font-size:15px" target="_blank"><font face="monospace, monospace">ORCID</font></a><span style="font-size:12.8px;color:rgb(0,0,0)"> </span><span style="font-size:12.8px;color:rgb(0,0,0)">| </span><span style="color:rgb(51,51,51);font-family:Arial,Helvetica,sans-serif;font-size:12px;white-space:nowrap"><a href="http://www.researcherid.com/rid/F-7305-2016" target="_blank">ResearcherID</a> | </span><font color="#333333" face="Arial, Helvetica, sans-serif"><span style="font-size:12px;white-space:nowrap"><a href="https://scholar.google.com/citations?user=i-2xZBQAAAAJ" target="_blank">Google citations</a></span></font><br></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div>
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