Greetings all
I’m working with North Africa images and data in WGS84 system. But Now I’m going to work with UTM. The thing is, my area-of-interest is covered by 2/3 UTM zones. My question is, how can I have them in the same location if they are in different UTM zones, so different coordinates systems? Or is it possible?
Thanks
Best regards
pedro
Don't think this is possible in Grass locations. You must have one
location for each UTM zone. in your case I belive the best option
would be to use a different projection (don't know which, I'm not very
experienced with projections....)
Daniel
On Mon, Feb 8, 2010 at 9:13 AM, Pedro Roma <pedroroma1982@gmail.com> wrote:
Greetings all
I'm working with North Africa images and data in WGS84 system. But Now I'm
going to work with UTM. The thing is, my area-of-interest is covered by 2/3
UTM zones. My question is, how can I have them in the same location if they
are in different UTM zones, so different coordinates systems? Or is it
possible?
Thanks
Best regards
pedro
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Dear Pedro,
Maybe you can pre-processed the imageries to one UTM zone using gdalwarp.
After that, you import those imageries to one location in GRASS.
Kind regards,
Firman Hadi
Center for Remote Sensing - ITB
Jl. Ganesha No. 10, 3rd Floor
Bandung - 40132
INDONESIA
Phone: +62-22-2530701
Fax: +62-22-2530702
Website : http://crs.itb.ac.id ; www.sigro.org
Blog : http://jalmiburung.wordpress.com
On 8 Feb 2010, at 20:51, Daniel Victoria wrote:
Don’t think this is possible in Grass locations. You must have one
location for each UTM zone. in your case I belive the best option
would be to use a different projection (don’t know which, I’m not very
experienced with projections…)Daniel
On Mon, Feb 8, 2010 at 9:13 AM, Pedro Roma <pedroroma1982@gmail.com> wrote:
Greetings all
I’m working with North Africa images and data in WGS84 system. But Now I’m
going to work with UTM. The thing is, my area-of-interest is covered by 2/3
UTM zones. My question is, how can I have them in the same location if they
are in different UTM zones, so different coordinates systems? Or is it
possible?
Thanks
Best regards
pedro
grass-user mailing list
grass-user mailing list
grass-user@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/grass-user
Hi all
But If I pre-process images to one UTM, I will get an geographic position for some UTM because I will use one UTM zona as reference to the others UTMzones…
On Mon, Feb 8, 2010 at 2:19 PM, Firman Hadi <jalmiburung@gmail.com> wrote:
Dear Pedro,
Maybe you can pre-processed the imageries to one UTM zone using gdalwarp.
After that, you import those imageries to one location in GRASS.Kind regards,
Firman Hadi
Center for Remote Sensing - ITB
Jl. Ganesha No. 10, 3rd Floor
Bandung - 40132
INDONESIA
Phone: +62-22-2530701
Fax: +62-22-2530702
Website : http://crs.itb.ac.id ; www.sigro.org
Blog : http://jalmiburung.wordpress.comOn 8 Feb 2010, at 20:51, Daniel Victoria wrote:
Don’t think this is possible in Grass locations. You must have one
location for each UTM zone. in your case I belive the best option
would be to use a different projection (don’t know which, I’m not very
experienced with projections…)Daniel
On Mon, Feb 8, 2010 at 9:13 AM, Pedro Roma <pedroroma1982@gmail.com> wrote:
Greetings all
I’m working with North Africa images and data in WGS84 system. But Now I’m
going to work with UTM. The thing is, my area-of-interest is covered by 2/3
UTM zones. My question is, how can I have them in the same location if they
are in different UTM zones, so different coordinates systems? Or is it
possible?
Thanks
Best regards
pedro
grass-user mailing list
grass-user mailing list
grass-user@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/grass-user
On Mon, 8 Feb 2010, Pedro Roma wrote:
But If I pre-process images to one UTM, I will get an geographic position
for some UTM because I will use one UTM zona as reference to the others
UTMzones...
I don't know how it's done, Pedro, but I know that the USGS did this for
their DEM maps of Oregon. Most of the state is in UTM Zone 10, but a
porttion of the eastern side is in UTM Zone 11. I think the metadata file
explains how they processed the data (in ARC/GIS) if you're interested.
Rich
Would it work to export your map from UTM into lat/long, and then reimport it into a different UTM location in the zone you want to work in? I did that with a map of the Mediterranean and Near East, all projected into a UTM zone somewhere in the middle. It looks a bit odd but it works.
Nick Cahill
On Feb 8, 2010, at 11:34 AM, Rich Shepard wrote:
On Mon, 8 Feb 2010, Pedro Roma wrote:
But If I pre-process images to one UTM, I will get an geographic position
for some UTM because I will use one UTM zona as reference to the others
UTMzones...I don't know how it's done, Pedro, but I know that the USGS did this for
their DEM maps of Oregon. Most of the state is in UTM Zone 10, but a
porttion of the eastern side is in UTM Zone 11. I think the metadata file
explains how they processed the data (in ARC/GIS) if you're interested.Rich
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Pedro Roma wrote:
I'm working with North Africa images and data in WGS84 system. But Now I'm
going to work with UTM. The thing is, my area-of-interest is covered by 2/3
UTM zones. My question is, how can I have them in the same location if they
are in different UTM zones, so different coordinates systems? Or is it
possible?
Each location has a single projection, meaning a projection type along
with all of its its parameters, so you can't use multiple UTM zones in
a single location.
You must either use a separate location for each zone or re-project
the maps to a common projection.
--
Glynn Clements <glynn@gclements.plus.com>
IIUC generally it is not a good idea to stray more than half a zone
beyond your central UTM zone. UTM is built for use in narrow strips and
local maps. For continental scale work it would be better to reproject
into an all covering projection, perhaps LCC or Albers.
I suggest that you ask the experts on the PROJ.4 mailing list for a
commonly used projection for the entire Med, or what should go into a
custom one.
Hamish
On Tue, Feb 9, 2010 at 8:36 AM, Hamish <hamish_b@yahoo.com> wrote:
IIUC generally it is not a good idea to stray more than half a zone
beyond your central UTM zone. UTM is built for use in narrow strips and
local maps. For continental scale work it would be better to reproject
into an all covering projection, perhaps LCC or Albers.I suggest that you ask the experts on the PROJ.4 mailing list for a
commonly used projection for the entire Med, or what should go into a
custom one.
The PVGIS people (JRC) use the projection
Lambert azimuthal equal area
for the Mediterranean Basin, Africa and South-West Asia
http://re.jrc.ec.europa.eu/pvgis/info/faq.htm
Might be an option (I would also ask on the PROJ.4 mailing list, though).
Markus