Le vendredi 08 novembre 2013 11:18:34, Even Rouault a écrit :
> Selon Trent Piepho :
>
> Thanks. Would you mind attaching it in a ticket in GDAL trac :
> http://trac.osgeo.org/gdal/newticket ?
> I see you've created the ticket for the corresponding libgeotiff part.
> Before applying the GDAL part,
Hello again,
Because of few customer cases I had to look this GeoTIFF/CT_Mercator
issue once again, this time in depth.
I studied how three software packages write GeoTIFFs as well as how
they read different combination of keys. These software are
GeoMedia Professional 06.01.11.13
ArcGIS Desktop
Hi Trent et al.
Thanks for your work on the issue.
I tested the files, and results were not satisfactory. But at least we
got more information on the issue.
FME opened both files.
The georeferencing of 18440_lowres_nol.tif was recognized by FME as:
DESC_NM: Global Mercator
DT_NAME: NAD83
PARM2:
On Wed, Nov 20, 2013 at 1:35 AM, Even Rouault
wrote:
>
> Le mercredi 20 novembre 2013 03:29:25, Trent Piepho a écrit :
> > That file had both StdParallel1 and ScaleAtNatOrigin defined.
> >
> > I've uploaded two new files. This one has only StdParallel1 defined with
> > no ScaleAtNatOrigin.
> > ht
Le mercredi 20 novembre 2013 03:29:25, Trent Piepho a écrit :
> Antii,
>
> Thank you for the testing. It looks like Arc/GIS works while FME and
> Intergraph don't.
Some of those proprietary software use GDAL, but possibly not for GeoTIFF
support, or if they do, perhaps with their own patches.
Antii,
Thank you for the testing. It looks like Arc/GIS works while FME and
Intergraph don't.
That file had both StdParallel1 and ScaleAtNatOrigin defined.
I've uploaded two new files. This one has only StdParallel1 defined with
no ScaleAtNatOrigin.
https://drive.google.com/file/d/0BybuTedE9CL
Hi Trent,
The chart opens in ArcMap (ArcGIS 10.0) well, and it is in right
location (Seattle).
Relevant properties of the file as seen by ArcGIS:
Cell Size: 240.003787, 240.003787
Extent
Top:4143530.20898
Left: -9278434.53415
Right: -9165872.75807
Bottom: 3984167.69444
Spatial Reference: Globa
It looks like arcgis does not support Mercator_1SP in geotiff files.
It just ignores the scale factor and uses 1.0. Which means in GDAL
and libgeotiff as they are now, there is no way to export Mercator
projections that don't have a scale of 1.0 to arcgis.
ArcGIS does support Mercator_2SP, but in
Hello Trent, Even et al.
Your work and comments on GeoTIFF and Mercator 2sp hopefully addresses the
problem I ran into few years ago. I wrote a description to ESRI's forums
with extracts of header information by ArcGIS and Geomedia. The postings
are at:
http://forums.arcgis.com/threads/24850-Pr
Selon Trent Piepho :
Thanks. Would you mind attaching it in a ticket in GDAL trac :
http://trac.osgeo.org/gdal/newticket ?
I see you've created the ticket for the corresponding libgeotiff part. Before
applying the GDAL part, I think we should wait for Frank having reviewed and
applied the libgeoti
Mercator_[12]SP are both the same projection in GeoTIFF. Lacking a
definition in the official specification, the intention appears to be that
for Mercator_2SP the latitude of true scale (lat_ts) should be specified in
ProjStdParallel1GeoKey and for Mercator_1SP the scale at origin (k) should
be sp
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