Example Global Mapper workflow to Geo-rectify the Blend Mask for your aerial imagery:
NOTE: This is intended to match your Blend Mask image Geo-rectification to that of the 'native' Geo-rectification assigned to your
original DG_Satellite_1.tif" GeoTIFF "DAY" image file when it was
first opened in Global Mapper.
After properly Geo-rectified, the Blend Mask image must be "re-projected" within
Global Mapper to the "projection" required by MSFS / P3D SDK Resample ...so that any subsequent exported data will be correctly formatted:
First, unload all open files from the Global Mapper work-space:
1.)
Global Mapper Menu > File > Unload All...
2.)
Global Mapper Menu > File > Rectify (Geo-reference) Imagery... (Batch Image Rectification Options dialog opens)
a.) In
"Batch Image Rectification Options dialog":
(1) Check:
"Add Rectified Images to Main Map View"
(2) Check:
"Show Rectified Images in Reference View"
(3) Check:
"Export Rectified Images to New Files"
(a) Tick:
GeoTIFF > Pick:
Grayscale Palette
(b) Click:
[OK] button ("Open" dialog pops up)
(c) In "
Open" dialog >
Browse / Select: "
X10_blendmask_gimp.tif"
("Tip" dialog opens)
(d) In "
Tip" dialog >
Read the info ! > click [
OK] button
(Image Rectifier [Automatic] (X10_blendmask_gimp.tif) dialog opens)
3.) In "
Image Rectifier [Automatic] (X10_blendmask_gimp.tif)" dialog:
a.)
Ground Control Point (GCP) Projection > click: [
Select Projection] button
("Projection" dialog opens)
(1) In "
Projection" dialog > configure:
Projection:
UTM
Zone:
17 (84 W - 78 W - Northern Hemisphere)
Datum:
WGS84
Planar Units:
Meters
(2) Click [
Apply] > [OK] buttons
4.) Back in "
Image Rectifier [Automatic] (X10_blendmask_gimp.tif)" dialog:
a.)
Ground Control Point (GCP) Entry > configure:
Upper-Left (NW corner) pixel
PixelX:
0
X/Easting/Lon:
532999.623
PixelY:
0
X/Northing/Lat:
2956194.610
(1) Click [
Add Point To List] button
("Ground Control Point Name" 'prompt' dialog opens)
(2) In "
Ground Control Point Name" 'prompt' dialog > Verify name submitted is "
Point 1"
(3) Click [
OK] button
(Point 1 appears in Ground Control Points list at bottom)
(b.)
Ground Control Point (GCP) Entry > configure:
Lower-Right (SE corner) pixel
PixelX:
11068
X/Easting/Lon:
536320.023
[
EDITED]
PixelY:
20640
X/Northing/Lat:
2950002.610
[
END_EDIT]
(1) Click [
Add Point To List] button
("Ground Control Point Name" 'prompt' dialog opens)
(2) In "
Ground Control Point Name" 'prompt' dialog > Verify name submitted is "
Point 2"
(3) Click [
OK] button
(Point 2 appears in Ground Control Points list at bottom)
5.) At bottom Right in "
Image Rectifier [Automatic] (X10_blendmask_gimp.tif)" dialog
a.) Click [
Apply] and [
OK] buttons
("Tip" dialog opens)
(b.) In "
Tip" dialog >
Read the info ! > click [
OK] button
("X10_blendmask_gimp.tif" loads in Global Mapper work-space)
c.) With "
X10_blendmask_gimp.tif" now loaded in Global Mapper work-space:
6.)
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] and
[OK] buttons
(Back to Global Mapper work-space)
7.)
Global Mapper Menu > File > Export > Export Raster Image Format ("Select Image Format" dialog opens)
8.) In "
Select Image Format" dialog pick-list, select
"GeoTIFF"; click [
OK] button
("GeoTIFF Export Options" dialog opens)
a.) In "
GeoTIFF Export Options" dialog >
{GeoTIFF Options} Tab:
(1) File Type
: 8-bit Palette Image
(2) Palette:
Grayscale Palette
(3) Resampling:
Bicubic Interpolation
(4) Sample Spacing / Scale: (Filled in automatically; IMHO: Do
not edit)
(5) Check "
Always Generate Square Pixels"
(6) Compression pick-list: select "
No Compression"
(7) Check
"Generate TFW (World) File
(8) Check
"Generate PRJ File (aka '
projection' info)
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"
Click [
OK] button
("Save As" dialog opens); enter desired GeoTIFF
Blend Mask file name and click "
Save"
You should now have a re-projected GeoTIFF
Blend Mask file to use in development for your project.
A step-by-step guide to Geo-rectify and re-project the
Water Mask for your aerial imagery will follow soon.
GaryGB
) a current actual Pixel Row and Column 'size' for your Mask images, refer to this:
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