Hello:
IIUC, you are making custom photo-realistic aerial imagery BGLs with MSFS / P3D SDK Resample.
If you
are intending to make custom photo-realistic aerial imagery BGLs with MSFS / P3D SDK Resample,
GeoTIFF files can be processed by Resample using a less complex INF file.
Resample will then read the Geo-referencing info it requires from inside the GeoTIFF files themselves, and will slice the aerial imagery source files into terrain-mesh-clinging tiles of a specific size and shape required by MSFS / P3D for display at their "3D world" location.
As Dick alludes to above, you may need to use a "
multi-source"-type
*.INF file for FS SDK Resample to create custom photo-real aerial imagery BGL(s) for such a large extent of coverage area to work around the
USERVA limitations of a project task session in SBuilderX (either 32-bit or 64-bit)
Note also that FS SDK Resample itself has a limitation in that it will only create BGLs up to (but
not exceeding)
2-GB in size.
Additionally, one could work around this by segmenting output of your master source 39,000x30,000 pixel GeoTIFF file into 2 or more smaller GeoTIFF files when exporting from
Global Mapper (aka "
GM").
Example Global Mapper workflow for exporting your aerial imagery:
Conceptual Overview:
In a empty GM work-space with no other files loaded, open your master source 39,000x30,000 GeoTIFF file.
NOTE: Based on your statement in the OP above, by default, when opened in
GM, your master source 39,000x30,000 pixel GeoTIFF file will initially have an internal
UTM Projection with a
GDA94 (Australian Geodetic 1994)
Datum
One must
next set GM's work-space to the "projection" required by MSFS / P3D SDK Resample ...so that any subsequent 'exported' GeoTIFF data files will be correctly formatted for use in FS.
A more detailed procedure:
1.)
Global Mapper Menu > File > Open Data File(s)... > Browse / select your:
"[Your GeoTIFF File Name].TIF"
2.)
Global Mapper Menu > Tools > Configure > [Projection Tab]
a.)
Configure:
Projection:
Geographic (Latitude/Longitude)
Datum:
WGS84
Planar Units:
Arc Degrees
Parameters > Attribute
Central Longitude = 0
b.) Click
Apply > OK
3.)
Global Mapper Menu > File > Export > Export Raster Image Format > (
"Select Image Format" dialog opens)
4.) In "
Select Image Format" dialog pick-list, select
"GeoTIFF"; click OK
("GeoTIFF Export Options" dialog opens)
a.) In "
GeoTIFF Export Options" dialog >
[GeoTIFF Options Tab]:
(1.) File Type
: 24-bit RGB
(2.) Resampling:
Default
(3.) Sample Spacing / Scale: (Filled in automatically; IMHO: Do
not edit)
(4.) Check "
Always Generate Square Pixels"
(5.) Compression pick-list: select "
No Compression"
NOTE:
(Do NOT use 'Default LZW Compression' or Resample take longer to process files !)
(6.) Check
"Generate TFW (World) File
(7.) Check
"Generate PRJ File (aka '
projection' info)
b.) In"
GeoTIFF Export Options" dialog >
[Tiling Tab]
(1.) Configure as necessary to segment exported GM output file extents into 2 or more parts
c.) In"
GeoTIFF Export Options" dialog >
[Export Bounds Tab]
(1.) Configure as necessary to segment original GM source file extents into 2 or more parts
Click
OK ("Save As" dialog opens); enter desired file name and click "
Save"
You should now have 2 or more GeoTIFF source files suitable for further use in development for your project.
BTW: You can
decrease the output file size of your aerial imagery BGL by approximately
40 percent (with little- if any- perceptible impact on visual quality when displayed at run time in FS) ...via a "
CompressionQuality = 85" parameter / value used in the "
multi-source"-type
*.INF file when the imagery source files are submitted to MSFS / P3D SDK Resample
ex:
Code:
[Destination]
CompressionQuality = 85
FYI: If you plan to perform graphical editing of your master source 39,000x30,000 pixel TIFF file, or any segmented GM export output GeoTIFF files, always make backups, and
only edit COPIES ! 
Before performing any graphical editing of your copied source 39,000x30,000 pixel TIFF file, or any copied segmented GM export output GeoTIFF files, use ollyau's
GeoTiff-to-INF utility to write out a FS SDK Resample
*.INF file for
each such file, so that you will have Geo-referencing info and other required parameter values for use with the (fixed pixel dimensions) edited imagery...when submitted via a "
multi-source"
*.INF file to FS SDK Resample.
http://www.fsdeveloper.com/forum/resources/geotiff-to-inf.119/
Also, when editing any such aerial imagery source file,
NEVER change the total number of pixel Rows and Columns in the image, as this will effectively change the texture image file pixel dimensions relative to the original (saved) Geo-referencing info and other required parameter values for use with the edited imagery ...intended to be used when submitted via a "multi-source" INF file to FS SDK Resample.
PS: If you wish to use
SBuilderX to make (smaller) 'example' derivative versions of your master source 39,000x30,000 pixel TIFF file to create seasonal textures, CVX vector scenery content BGLs etc. via the SBuilderX "
Add Map > From Disk" feature, additional copies of the (minimum 2 or 3
smaller) segmented GM export output GeoTIFF files may need to be separately exported from GM in
UTM Projection with a
WGS84 Datum ...in order for SBuilderX to process them during "import".
If you still wish to explore the option to "import" (
smaller) segmented GM export output GeoTIFF files into
SBuilderX, feel free to inquire further within this thread.
Hope this helps !
GaryGB
