Hello, I noticed that from Geonode a raster file cannot be downloaded as GeoTiff. This is an issue for GIS people because we are forced to download rasters as normal images which are not georeferenced; it means that in order to use that raster again we should georeference it with the risk of introducing errors in the original raster accuracy. Will it be possible in the future to download raster data as GeoTiff? Many thanks -- Simone Balbo Environmental Engineer - PhD student ITHACA - Information Technology for Humanitarian Assistance, Cooperation and Action via Pier Carlo Boggio 61 - 10138 - Torino - Italy 011 1975 1860
Simone,
This has come up in one of the downstream projects (TsuDAT). I did a
quick mod to add GeoTiff to the list of download types on the Layer
Info page. This was done in maps/models.py by adding GeoTiff to the
list here
https://github.com/GeoNode/geonode/blob/e91464aef4d79d93d9e8960019d676ca47982414/src/GeoNodePy/geonode/maps/models.py#L783
like this
("geotiff", _("GeoTiff"), "image/geotiff"),
Note that this will return you a 3 band RGB tiff, which is not really
appropriate for downloading DEMs and other grayscale images where you
want the actual data ... this *is* a problem for TsuDAT, but may work
for you.
Let me know if that helps,
Jeff
On Tue, Jul 12, 2011 at 9:20 AM, Simone Balbo <simone.balbo@polito.it> wrote:
> Hello,
> I noticed that from Geonode a raster file cannot be downloaded as GeoTiff.
> This is an issue for GIS people because we are forced to download rasters as
> normal images which are not georeferenced; it means that in order to use
> that raster again we should georeference it with the risk of introducing
> errors in the original raster accuracy.
> Will it be possible in the future to download raster data as GeoTiff?
> Many thanks
>
> --
> Simone Balbo
> Environmental Engineer - PhD student
> ITHACA - Information Technology for Humanitarian Assistance, Cooperation and
> Action
> via Pier Carlo Boggio 61 - 10138 - Torino - Italy
> 011 1975 1860
>
Jeff, thank you very much for the information! I modified the maps/models.py and I have been able to download GeoTiffs which mantain the original georeferencing: this is great for GIS people! But once uploaded up to Geonode and then downloaded, the raster changes spatial resolution: number of rows and columns is smaller than the original raster. Do you have any suggestion about how to obtain exactly the same raster as it was uploaded? Thanks Simone On 12 July 2011 12:35, Jeffrey Johnson <jjohnson@opengeo.org> wrote: > Simone, > > This has come up in one of the downstream projects (TsuDAT). I did a > quick mod to add GeoTiff to the list of download types on the Layer > Info page. This was done in maps/models.py by adding GeoTiff to the > list here > > > https://github.com/GeoNode/geonode/blob/e91464aef4d79d93d9e8960019d676ca47982414/src/GeoNodePy/geonode/maps/models.py#L783 > > like this > > ("geotiff", _("GeoTiff"), "image/geotiff"), > > Note that this will return you a 3 band RGB tiff, which is not really > appropriate for downloading DEMs and other grayscale images where you > want the actual data ... this *is* a problem for TsuDAT, but may work > for you. > > Let me know if that helps, > > Jeff > > > On Tue, Jul 12, 2011 at 9:20 AM, Simone Balbo <simone.balbo@polito.it> > wrote: > > Hello, > > I noticed that from Geonode a raster file cannot be downloaded as > GeoTiff. > > This is an issue for GIS people because we are forced to download rasters > as > > normal images which are not georeferenced; it means that in order to use > > that raster again we should georeference it with the risk of introducing > > errors in the original raster accuracy. > > Will it be possible in the future to download raster data as GeoTiff? > > Many thanks > > > > -- > > Simone Balbo > > Environmental Engineer - PhD student > > ITHACA - Information Technology for Humanitarian Assistance, Cooperation > and > > Action > > via Pier Carlo Boggio 61 - 10138 - Torino - Italy > > 011 1975 1860 > > > -- Simone Balbo Environmental Engineer - PhD student ITHACA - Information Technology for Humanitarian Assistance, Cooperation and Action via Pier Carlo Boggio 61 - 10138 - Torino - Italy 011 1975 1860
On Tue, Jul 12, 2011 at 12:12 PM, Simone Balbo <simone.balbo@polito.it> wrote: > Jeff, > thank you very much for the information! > I modified the maps/models.py and I have been able to download GeoTiffs > which mantain the original georeferencing: this is great for GIS people! > But once uploaded up to Geonode and then downloaded, the raster changes > spatial resolution: number of rows and columns is smaller than the original > raster. Do you have any suggestion about how to obtain exactly the same > raster as it was uploaded? This is something that has been raised by the Risiko folks. here https://github.com/AIFDR/riab/issues/102 and various other places. It's something we will be looking into. Also, see my previous mail about the WCS download links not being provided which is the real source of this error. Im looking into that now and will report back to the list. Jeff > Thanks > Simone > > On 12 July 2011 12:35, Jeffrey Johnson <jjohnson@opengeo.org> wrote: >> >> Simone, >> >> This has come up in one of the downstream projects (TsuDAT). I did a >> quick mod to add GeoTiff to the list of download types on the Layer >> Info page. This was done in maps/models.py by adding GeoTiff to the >> list here >> >> >> https://github.com/GeoNode/geonode/blob/e91464aef4d79d93d9e8960019d676ca47982414/src/GeoNodePy/geonode/maps/models.py#L783 >> >> like this >> >> ("geotiff", _("GeoTiff"), "image/geotiff"), >> >> Note that this will return you a 3 band RGB tiff, which is not really >> appropriate for downloading DEMs and other grayscale images where you >> want the actual data ... this *is* a problem for TsuDAT, but may work >> for you. >> >> Let me know if that helps, >> >> Jeff >> >> >> On Tue, Jul 12, 2011 at 9:20 AM, Simone Balbo <simone.balbo@polito.it> >> wrote: >> > Hello, >> > I noticed that from Geonode a raster file cannot be downloaded as >> > GeoTiff. >> > This is an issue for GIS people because we are forced to download >> > rasters as >> > normal images which are not georeferenced; it means that in order to use >> > that raster again we should georeference it with the risk of introducing >> > errors in the original raster accuracy. >> > Will it be possible in the future to download raster data as GeoTiff? >> > Many thanks >> > >> > -- >> > Simone Balbo >> > Environmental Engineer - PhD student >> > ITHACA - Information Technology for Humanitarian Assistance, Cooperation >> > and >> > Action >> > via Pier Carlo Boggio 61 - 10138 - Torino - Italy >> > 011 1975 1860 >> > > > > > -- > Simone Balbo > Environmental Engineer - PhD student > ITHACA - Information Technology for Humanitarian Assistance, Cooperation and > Action > via Pier Carlo Boggio 61 - 10138 - Torino - Italy > 011 1975 1860 >
Simone et al, I did find that there was a small bug in the way in which the WCS request was setup when preparing the download links for the Layer info page. That was ticketed here http://dev.geonode.org/trac/ticket/998 and fixed (see ticket notes). However, when investigating this, I did find that, as you say, the wcs download link provided does _not_ provide an *exact* copy of the original tiff as configured in geoserver. Like you, I found that both the size and bounding box changed. This has been ticketed here http://dev.geonode.org/trac/ticket/1000 ... and I will be looking into it further. Jeff On Tue, Jul 12, 2011 at 12:18 PM, Jeffrey Johnson <jjohnson@opengeo.org> wrote: > On Tue, Jul 12, 2011 at 12:12 PM, Simone Balbo <simone.balbo@polito.it> wrote: >> Jeff, >> thank you very much for the information! >> I modified the maps/models.py and I have been able to download GeoTiffs >> which mantain the original georeferencing: this is great for GIS people! >> But once uploaded up to Geonode and then downloaded, the raster changes >> spatial resolution: number of rows and columns is smaller than the original >> raster. Do you have any suggestion about how to obtain exactly the same >> raster as it was uploaded? > > This is something that has been raised by the Risiko folks. > > here https://github.com/AIFDR/riab/issues/102 > > and various other places. > > It's something we will be looking into. > > Also, see my previous mail about the WCS download links not being > provided which is the real source of this error. Im looking into that > now and will report back to the list. > > Jeff > > >> Thanks >> Simone >> >> On 12 July 2011 12:35, Jeffrey Johnson <jjohnson@opengeo.org> wrote: >>> >>> Simone, >>> >>> This has come up in one of the downstream projects (TsuDAT). I did a >>> quick mod to add GeoTiff to the list of download types on the Layer >>> Info page. This was done in maps/models.py by adding GeoTiff to the >>> list here >>> >>> >>> https://github.com/GeoNode/geonode/blob/e91464aef4d79d93d9e8960019d676ca47982414/src/GeoNodePy/geonode/maps/models.py#L783 >>> >>> like this >>> >>> ("geotiff", _("GeoTiff"), "image/geotiff"), >>> >>> Note that this will return you a 3 band RGB tiff, which is not really >>> appropriate for downloading DEMs and other grayscale images where you >>> want the actual data ... this *is* a problem for TsuDAT, but may work >>> for you. >>> >>> Let me know if that helps, >>> >>> Jeff >>> >>> >>> On Tue, Jul 12, 2011 at 9:20 AM, Simone Balbo <simone.balbo@polito.it> >>> wrote: >>> > Hello, >>> > I noticed that from Geonode a raster file cannot be downloaded as >>> > GeoTiff. >>> > This is an issue for GIS people because we are forced to download >>> > rasters as >>> > normal images which are not georeferenced; it means that in order to use >>> > that raster again we should georeference it with the risk of introducing >>> > errors in the original raster accuracy. >>> > Will it be possible in the future to download raster data as GeoTiff? >>> > Many thanks >>> > >>> > -- >>> > Simone Balbo >>> > Environmental Engineer - PhD student >>> > ITHACA - Information Technology for Humanitarian Assistance, Cooperation >>> > and >>> > Action >>> > via Pier Carlo Boggio 61 - 10138 - Torino - Italy >>> > 011 1975 1860 >>> > >> >> >> >> -- >> Simone Balbo >> Environmental Engineer - PhD student >> ITHACA - Information Technology for Humanitarian Assistance, Cooperation and >> Action >> via Pier Carlo Boggio 61 - 10138 - Torino - Italy >> 011 1975 1860 >> >
Hi Simone et al, I started to look into this today to try and solve the problem in TsuDAT ... and it looks like it 'should' work ... as in should provide a link to download the raster as a GeoTiff from the WCS, but something is broken. I've filed this as ticket #998 and will be looking into it today. http://dev.geonode.org/trac/ticket/998 Jeff On Tue, Jul 12, 2011 at 9:35 AM, Jeffrey Johnson <jjohnson@opengeo.org> wrote: > Simone, > > This has come up in one of the downstream projects (TsuDAT). I did a > quick mod to add GeoTiff to the list of download types on the Layer > Info page. This was done in maps/models.py by adding GeoTiff to the > list here > > https://github.com/GeoNode/geonode/blob/e91464aef4d79d93d9e8960019d676ca47982414/src/GeoNodePy/geonode/maps/models.py#L783 > > like this > > ("geotiff", _("GeoTiff"), "image/geotiff"), > > Note that this will return you a 3 band RGB tiff, which is not really > appropriate for downloading DEMs and other grayscale images where you > want the actual data ... this *is* a problem for TsuDAT, but may work > for you. > > Let me know if that helps, > > Jeff > > > On Tue, Jul 12, 2011 at 9:20 AM, Simone Balbo <simone.balbo@polito.it> wrote: >> Hello, >> I noticed that from Geonode a raster file cannot be downloaded as GeoTiff. >> This is an issue for GIS people because we are forced to download rasters as >> normal images which are not georeferenced; it means that in order to use >> that raster again we should georeference it with the risk of introducing >> errors in the original raster accuracy. >> Will it be possible in the future to download raster data as GeoTiff? >> Many thanks >> >> -- >> Simone Balbo >> Environmental Engineer - PhD student >> ITHACA - Information Technology for Humanitarian Assistance, Cooperation and >> Action >> via Pier Carlo Boggio 61 - 10138 - Torino - Italy >> 011 1975 1860 >> >