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.
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
On Tue, Sep 19, 2017 at 1:41 AM, Laurent C. <lrntct@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.885571Best regards,
Laurent
grass-user mailing list
grass-user@lists.osgeo.org
https://lists.osgeo.org/mailman/listinfo/grass-user
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.
We could make it more clear during the revision.
Best,
Laurent
On 19 Sep 2017 01:49, “Markus Metz” <markus.metz.giswork@gmail.com> wrote:
On Tue, Sep 19, 2017 at 1:41 AM, Laurent C. <lrntct@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.885571Best regards,
Laurent
grass-user mailing list
grass-user@lists.osgeo.org
https://lists.osgeo.org/mailman/listinfo/grass-user
On Tue, Sep 19, 2017 at 5:53 PM, Laurent C. <lrntct@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.
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,
LaurentOn 19 Sep 2017 01:49, “Markus Metz” <markus.metz.giswork@gmail.com> wrote:
On Tue, Sep 19, 2017 at 1:41 AM, Laurent C. <lrntct@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.885571Best regards,
Laurent
grass-user mailing list
grass-user@lists.osgeo.org
https://lists.osgeo.org/mailman/listinfo/grass-user
Hi all,
btw: another reprocessing is forthcoming:
"NASADEM: Creating a New NASA Digital Elevation Model and Associated Products"
https://earthdata.nasa.gov/community/community-data-system-programs/measures-projects/nasadem
Conf. paper from 2016:
NASADEM GLOBAL ELEVATION MODEL: METHODS AND PROGRESS
https://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XLI-B4/125/2016/isprs-archives-XLI-B4-125-2016.pdf
Some provisional data: https://lpdaac.usgs.gov/provisional
Best,
markusN
Very interesting, I didn’t knew that there was provisional data available.
Couldn’t get one tile opened in QGIS or GRASS with GDAL, though. Got it with r/in.bin:
r.in.bin -f -s --overwrite input=n00w064.srtmOnly.hgt output=nasadem bytes=4 order=big north=0 south=-1 east=-63 west=-64 rows=3601 cols=3601
Carlos
On Tue, Sep 19, 2017 at 6:21 PM, Markus Neteler <neteler@osgeo.org> wrote:
Hi all,
btw: another reprocessing is forthcoming:
“NASADEM: Creating a New NASA Digital Elevation Model and Associated Products”
https://earthdata.nasa.gov/community/community-data-system-programs/measures-projects/nasademConf. paper from 2016:
NASADEM GLOBAL ELEVATION MODEL: METHODS AND PROGRESS
https://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XLI-B4/125/2016/isprs-archives-XLI-B4-125-2016.pdfSome provisional data: https://lpdaac.usgs.gov/provisional
Best,
markusN
grass-user mailing list
grass-user@lists.osgeo.org
https://lists.osgeo.org/mailman/listinfo/grass-user
–
Prof. Carlos Henrique Grohmann
Institute of Energy and Environment - Univ. of São Paulo, Brazil
http://carlosgrohmann.com
http://orcid.org/0000-0001-5073-5572
Can’t stop the signal.
On Tue, Sep 19, 2017 at 9:10 PM, Markus Metz <markus.metz.giswork@gmail.com> wrote:
On Tue, Sep 19, 2017 at 5:53 PM, Laurent C. <lrntct@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.pdfthe 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/SRTM1Arcit 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 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,
LaurentOn 19 Sep 2017 01:49, “Markus Metz” <markus.metz.giswork@gmail.com> wrote:
On Tue, Sep 19, 2017 at 1:41 AM, Laurent C. <lrntct@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.885571Best regards,
Laurent
grass-user mailing list
grass-user@lists.osgeo.org
https://lists.osgeo.org/mailman/listinfo/grass-user
2017-09-20 4:07 GMT-05:00 Markus Metz <markus.metz.giswork@gmail.com>:
On Tue, Sep 19, 2017 at 9:10 PM, Markus Metz <markus.metz.giswork@gmail.com>
wrote:On Tue, Sep 19, 2017 at 5:53 PM, Laurent C. <lrntct@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.pdfthe 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/SRTM1Arcit 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/SRTM1Arcthe 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
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 2.1Markus M
>
> Best,
> Laurent
>
> On 19 Sep 2017 01:49, "Markus Metz" <markus.metz.giswork@gmail.com>
> wrote:
>
>
>
> On Tue, Sep 19, 2017 at 1:41 AM, Laurent C. <lrntct@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@lists.osgeo.org
> > https://lists.osgeo.org/mailman/listinfo/grass-user
>
>
On Thu, Sep 21, 2017 at 7:47 PM, Laurent C. <lrntct@gmail.com> wrote:
2017-09-20 4:07 GMT-05:00 Markus Metz <markus.metz.giswork@gmail.com>:
On Tue, Sep 19, 2017 at 9:10 PM, Markus Metz <markus.metz.giswork@gmail.com>
wrote:On Tue, Sep 19, 2017 at 5:53 PM, Laurent C. <lrntct@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.pdfthe 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/SRTM1Arcit 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/SRTM1Arcthe 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,
LaurentMarkus 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 2.1Markus M
Best,
LaurentOn 19 Sep 2017 01:49, “Markus Metz” <markus.metz.giswork@gmail.com>
wrote:On Tue, Sep 19, 2017 at 1:41 AM, Laurent C. <lrntct@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.885571Best regards,
Laurent
grass-user mailing list
grass-user@lists.osgeo.org
https://lists.osgeo.org/mailman/listinfo/grass-user
Following this line, I’d like to know if anyone has already used the EarthEnv DEM data.
Thank you.
2017-09-21 16:22 GMT-03:00 Markus Metz <markus.metz.giswork@gmail.com>:
On Thu, Sep 21, 2017 at 7:47 PM, Laurent C. <lrntct@gmail.com> wrote:
2017-09-20 4:07 GMT-05:00 Markus Metz <markus.metz.giswork@gmail.com>:
On Tue, Sep 19, 2017 at 9:10 PM, Markus Metz <markus.metz.giswork@gmail.com>
wrote:On Tue, Sep 19, 2017 at 5:53 PM, Laurent C. <lrntct@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.pdfthe 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/SRTM1Arcit 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/SRTM1Arcthe 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.htmlThe 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_tableJPL/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_v003Personally, 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,
LaurentMarkus 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 2.1Markus M
Best,
LaurentOn 19 Sep 2017 01:49, “Markus Metz” <markus.metz.giswork@gmail.com>
wrote:On Tue, Sep 19, 2017 at 1:41 AM, Laurent C. <lrntct@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.885571Best regards,
Laurent
grass-user mailing list
grass-user@lists.osgeo.org
https://lists.osgeo.org/mailman/listinfo/grass-user
grass-user mailing list
grass-user@lists.osgeo.org
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 | CV | ResearchGate | GitHub | ORCID | ResearcherID | Google citations
2017-09-21 14:22 GMT-05:00 Markus Metz <markus.metz.giswork@gmail.com>:
The JPL/NASA website also links to
http://dds.cr.usgs.gov/srtm/
where you get the JPL/NASA SRTM products version 1 and 2.1JPL/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_v003Personally, 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
Interesting, thanks. I did not know that there was various versions of
the 1arcsec. I might have a look.
Laurent