Hi Bill:
I'm curious if you may be able to eliminate the 4th NIR Band (aka "
R-G-B-I") in your version of
Global Mapper (aka "
GM") via the GeoTIFF export options dialog box ...as alluded to in this online GM documentation:
https://www.bluemarblegeo.com/knowledgebase/global-mapper/GeoTIFF.htm
"
Multi-band - This option generates a raster GeoTIFF file with 1 or more bands of data at either 8-, 16-, or 32-bits per band of data. This option is very useful when working with multi-spectral imagery with more than 3 bands of data, like RGBI or Landsat imagery, or data sets with more than 8 bits per color channel. If you select this option, after hitting OK to start the dialog additional dialogs will be presented allowing you to further setup the multi-band export by choosing the input sources for each band in the output image."
Here's a modified version of my recent post on exporting GeoTIFF aerial imagery from Global Mapper...
Example Global Mapper workflow for exporting aerial imagery as a GeoTIFF:
After
first opening
a copy of your aerial imagery data file in its native "projection", one must
next set Global Mapper to the "projection" required by MSFS / P3D SDK Resample ...so that any subsequent exported data will be correctly formatted:
1.)
GM Menu > File > Open Data File(s)... > Browse / select / open [
your 4-Band aerial imagery file]; next:
2.)
GM 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.)
GM 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
: 'tick'
Multi-Band > 'pick' (
8-bits per Band)
3 Bands
(2) Palette: <
Filled in automatically; IMHO: Do not edit >
(3) Resampling:
Default
(4)
Sample Spacing / Scale:
(a) X-axis / Y-axis: <
Filled in automatically; IMHO: Do not edit >
(b) Always Generate Square Pixels: '
Checked'
(c) Export at the Fixed Scale 1: <
'Un-checked'; IMHO: Do not edit >
(5)
TIFF Format Options:
(a) DPI Value to Save in Image (0 For None): "
0" <
(not used for FS); IMHO: Do not edit >
(b) Compression pick-list: 'pick' "
No Compression"
(if compression used ...FS SDK Resample may run very slow !)
(c) Make Background (Void) Pixels Transparent: <
'Un-checked'; IMHO: Do not edit >
(d) ADVANCED: Use Tile Rather than Strip Orientation: <
'Un-checked' (not used for FS); IMHO: Do not edit >
(e) ADVANCED: JPEG-in-TIFF Quality: <
'75' (not used for FS); IMHO: Do not edit >
(6) Interpolate to Fill Small Gaps in Data: '
Checked'
(7) Generate TFW (World) File:
'Checked'
(8) Generate PRJ File (aka '
projection' info):
'Checked'
(9) Generate OziExplorer map File:
'Un-checked'
(10) ADVANCED: Don't Write GeoTIFF Header:
'Un-checked'
b.) In "
GeoTIFF Export Options" dialog >
[Tiling tab
]
(1.) Select "
No Tiling - Just One Export File"
c.) In "
GeoTIFF Export Options" dialog >
[Export Bounds tab
]
(1.) Select "
All Loaded Data"
Finally, once again in "
GeoTIFF Export Options" dialog >
[GeoTIFF Options tab
]:
...
verify settings in:
(1)
File Type: 'tick'
Multi-Band > 'pick' (
8-bits per Band)
3 Bands
...Now, click [
OK];
< [Set Up Bands For Export] dialog opens >
(a) In [
Set Up Bands For Export] dialog > {Select Input
Layer}: '
Check'
only your aerial imagery layer
NOTE: These listed layers should correlate exactly with what layers are listed (and/or '
Checked') ...via:
GM Menu > Tools > Control Center... > Overlay Control Center
(b) In [
Set Up Bands For Export] dialog > {Select Input
Band}: '
link'
only your aerial imagery layer to each Band:
* Band 1 [
Red color channel]
* Band 2 [
Green color channel]
* Band 3 [
Blue color channel]
After you '
Check' and 'link'
only your aerial imagery layer as input for the R-G-B output bands, click [
OK];
< Save As dialog opens>
(c) In ["
Save As" dialog], enter your desired output
[GeoTIFF file name and path], then click [
Save]
AFAIK, you should now have output a "
3-Band GeoTIFF" source file for use in development for your project.
PS: One may also wish to use an original copy of any "
R-G-B-I" aerial imagery GeoTIFF with the 4th NIR Band
intact, for use with
Arno's excellent
ScenProc ...to further enhance its vegetation detection capabilities when using
ScenProc's
semi-automated Autogen creation features.
Hope this helps in using GM as a "
GUI alternative" to typing obscure
GDAL command line switches and parameter values !
GaryGB
