Please note: These instructions are for Coweeta LTER "no border" images
that have recoded null/background values to Maximum. You must have
Coweeta LTER "no border" images or recode your own images during
subsetting.
Coweeta has recoded our DRG's to remove the inherent difficulties of
mosaicing DRG's. We have accomplished this by making the null or
background value higher than all valid values. Just remember:
"Minimum Value" in overlay options.
Prerequisites:
ERDAS IMAGINE software installed on your computer.
Downloaded DRG's from Coweeta - no border/img option OR DRG's that have
been decollared and null/background set to 15.
STEP 1:
Open ERDAS IMAGINE.
Data Prep > Mosaic Images...
STEP 2:
Mosaic Tool > Edit > Add Images...
STEP 3:
Highlight Images to Add.
Choose "Use Entire Image" radio button.
Click Add.
STEP 4:
Mosaic Tool > Edit > Set Overlap Function...
STEP 4:
Choose Radio Button "No Cutline Exists"
Choose Radio Button "Minimum"
Click "Apply"
Click "Close"
Please note: These instructions are for Coweeta LTER "no border" images
that our GIS team have
recoded null/background values to Maximum. You must have Coweeta
LTER "no border" images or
recode your own images during subsetting.
STEP 5:
Mosaic Tool > Process > Run Mosaic
STEP 6:
Enter Output File Name
Ignore Input Values: Leave blank or enter: 15
Output Background Value: 15
Check "Stats Ignore Value" and enter: 15
Click OK
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