Georeferencing Maps [was GPS and airspace]

"Kyler Laird" wrote in message
...
"John Clonts" writes:

FYI, I patched the tags in my test file (from

https://aviationtoolbox.org/Members/...le=50&image_fo
rmat=GeoTIFF&lr_Y=-753147.0&lr_X=318457.0&ul_X=216057.0&ul_Y=-676347.0)
with geotifcp per J.G.'s instructions, and Oziexplorer is happy with that
image now. Do you know if changing your generation code would be
appropriate, and/or cause other problems with other software?

It's appropriate and I want to do it. If it causes any problems, I'll
work through them. I want these things to be correct.

Yesterday I distilled the code to a few lines that demonstrate the
problem and sent a report to the GDAL developer mailing list.
http://remotesensing.org/mailman/listinfo/gdal-dev/
It hasn't appeared in the archives yet.


Hello Kyler,

Well, I haven't seen your inquiry show up there yet-- nor at the nntp site
news.gmane.org/gmane.comp.gis.gdal.devel.

But in the mean time I did some digging, and determined a fix that seems to
work for it, in gdal-1.2.1\frmts\gtiff\gt_wkt_srs.cpp, line 1419:

else if( EQUAL(pszProjection,SRS_PT_LAMBERT_CONFORMAL_CONIC _2SP) )
{
GTIFKeySet(psGTIF, GTModelTypeGeoKey, TYPE_SHORT, 1,
ModelTypeProjected);
GTIFKeySet(psGTIF, ProjectedCSTypeGeoKey, TYPE_SHORT, 1,
KvUserDefined );
GTIFKeySet(psGTIF, ProjectionGeoKey, TYPE_SHORT, 1,
KvUserDefined );

GTIFKeySet(psGTIF, ProjCoordTransGeoKey, TYPE_SHORT, 1,
CT_LambertConfConic_2SP );

GTIFKeySet(psGTIF, ProjFalseOriginLatGeoKey, TYPE_DOUBLE, 1,
poSRS-GetProjParm( SRS_PP_LATITUDE_OF_ORIGIN, 0.0 ) );

/* jcc 7/2/04 changed from ProjFalseOriginLongGeoKey */
GTIFKeySet(psGTIF, ProjNatOriginLongGeoKey, TYPE_DOUBLE, 1, //
line 1419
poSRS-GetProjParm( SRS_PP_CENTRAL_MERIDIAN, 0.0 ) );

GTIFKeySet(psGTIF, ProjStdParallel1GeoKey, TYPE_DOUBLE, 1,
poSRS-GetProjParm( SRS_PP_STANDARD_PARALLEL_1, 0.0 ) );

I tried to post to the nntp server on the devel list but it did not accept
my posting... perhaps you have better connections into that group.

I will post my new pymod\_gdal.dll and bin\gdal12.dll on
alt.binaries.pictures.aviation if you would like to test them...

Cheers,
John