"Tom Jackson" writes:

Maybe I'm missing something -- I'll quickly walk you through what I do in
Oziexlporer:
After launching Oziexplorer, I go to the "file" menu, and select "load and
calibrate map image"
This loads the image, but requires that I supply additional data in order to
calibrate the image.

It doesn't sound like you're using a TIFF.

There is an additional menu option to "import map", however, GeoTIFF isn't
an option.

Is "TIFF" an option? A GeoTIFF is just a regular TIFF with some standard
tagged data.

OziExplorer can extract the georeference information from Geotiff files but
it only knows how to decode the information if it is from a known source. At
this stage only the georeference information in the USA USGS DRG Geotiffs
can be decoded.

Oh...hmmm...that's a strange limitation.

The ability to decode other sources of georeference information in Geotiff
files will be added on an as need basis where it is possible to do so.

O.k., so OziExplorer is kinda dumb right now. Looks like you get to do it
manually for awhile.

Converting Geotiff Image Files

Some Geotiff Image files are in the 24 bit color format. OziExplorer can
read 24 bit color TIFF files but must load them fully into RAM instead of
paging them from disk as it does with 8 bit color TIFF mages. For large
images this requires a lot of RAM.

The sectional maps from the FAA are 8-bit color (palette). I convert them
to 24-bit (RGB) when I mask them. The chunks I build are 24-bit.

If you convert these files to 8 bit color the Geotiff georeference
information is lost.

This is just another limitation of OziExplorer. Changing the pixel
representation has little to do with the ability to hold GeoTIFF data.

I'm planning on making 8-bit versions available but it's easier to
manipulate (warp/scale/blend/...) the data without mangling it in 24-bit
mode. My preference is to wait until the last step to create the 8-bit
images.

Software to convert the Geotiff image from 24 bit to 8 bit color. Paint Shop
Pro (www.jasc.com) works well.

Oh, well sure. *That* will destroy the GeoTIFF data.

Perhaps the developer of Oziexplorer needs to add these types of files to
its list of "known" types. I will e-mail them.

Good luck. I'm sorry I made comments assuming that OziExplorer would
deal with GeoTIFFs sensibly.

--kyler