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Posted by JumpJack on January 15, 2009, 2:54 am
where could I find a freeware program for windows to create Transverse
Mercator and Lambert azimutal projections of jpg images.

Posted by user923005 on January 15, 2009, 6:43 pm
> where could I find a freeware program for windows to create Transverse
> Mercator and Lambert azimutal projections of jpg images.

Did you look at this:
http://gmt.soest.hawaii.edu/

Posted by JumpJack on January 22, 2009, 3:20 pm
> > where could I find a freeware program for windows to create Transverse
> > Mercator and Lambert azimutal projections of jpg images.
> Did you look at this:http://gmt.soest.hawaii.edu/

Yes thanks, but it looks too complex for my poor GIS skill, and I
was not able to figure out which commandline to use to just get one of
these maps ( http://www.oera.net/How2/TextureMaps2.htm ) into an UTM
or Lambert map...
Any clue?

I also found PROJ4, QGIS and GRASS, but they too are VERY complex
programs, and I can't just figure out how to perform a "trivial"
projection conversion...

Posted by Luca Morandini on January 16, 2009, 2:41 am
JumpJack wrote:
> where could I find a freeware program for windows to create Transverse
> Mercator and Lambert azimutal projections of jpg images.

Gdalwarp fits the bill if you want to transform from one coordinate
system to another (http://www.gdal.org/gdalwarp.html ), if you have to
georeference "raw" images via ground control points, then Quantum GIS
with the Georeferencer plugin will get it done (http://www.qgis.org/ ).

Regards,

--------------------
Luca Morandini
www.lucamorandini.it
--------------------

Posted by JumpJack on January 22, 2009, 3:25 pm
> JumpJack wrote:
> > where could I find a freeware program for windows to create Transverse
> > Mercator and Lambert azimutal projections of jpg images.
> Gdalwarp fits the bill if you want to transform from one coordinate
> system to another (http://www.gdal.org/gdalwarp.html ), if you have to
> georeference "raw" images via ground control points, then Quantum GIS
> with the Georeferencer plugin will get it done (http://www.qgis.org/ ).
I need to convert a GIF map into an UTM map and into a Lambert map:

"0-75 degrees are in transverse mercator projection, each petal is 30
degrees wide and centered in each petals central longitude. Standard
latitude is 0 degrees (hence the straight edge). Polar region from 75
to 90 degrees latitude is in Lambert Azimuthal Equal Area projection."

or

"Create a "flower petal" projection for globes
Create a series of 12 Transverse Mercator projections that are 32
degrees in longitude and 91 degrees in latitude to form a "flower
petal" projection for making globes. If the northern hemisphere is
being created, the latitude range is -1 to +90. If the southern
hemisphere is being created, the latitude range is -90 to 1. The
petals are formed by changing the center longitude and map rotation in
steps of 30 degrees for each Transverse Mercator projection. Each
section is put into the mosaic. The final center of the projection is
a Lambert Azimuthal Equal-area centered on the pole and covers from
-90 to -75 or 75 to 90 degrees latitude and 360 degrees in longitude.
This is the last cube that is placed in the mosaic."

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