Merge Altitudes
Suprisingly, none of the bathy or waveform files contained altitude data. Instead, I used the altitudes extracted from the _ImageIndex.txt files.
I used the altitude to investigate its influence to the optical surface or seabed backscatter, so I needed a lat lon altitude file.
Of each flight line the _ImageIndex.txt file lists information suchs as timestamps, lat lon, roll, pitch, etc etc.
I first pull out the altitudes and store it in an ascii file. This file is fed in mergeAltitude along with a merged file.
The program searches the through the merged file, scan by scan, and dumps out the lat lon and altitude of each beam.
1) get altitudes from ??_ImageIndex.txt files:
awk '{print $2" " $11}' < 03DS06100_003_060703_1759_A_FL031_ImageIndex.txt > 1759.altitude
awk '{print $2" " $11}' < 03DS06100_003_060703_1759_A_FL251_ImageIndex.txt >> 1759.altitude
awk '{print $2" " $11}' < 03DS06100_003_060703_1759_A_FL261_ImageIndex.txt >> 1759.altitude
awk '{print $2" " $11}' < 03DS06100_003_060703_1759_A_FL271_ImageIndex.txt >> 1759.altitude
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2) use mergeAltitude to get lat lon alt at each beam:
mergeAltitude -in merged_file -alt altitudefile.ascii -out outfile
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Last modified: 2-9-08 Pim.
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