Backscatter
Data Processing Pipeline
Through measuring and processing the
backscatter, we can get an idea of the type of sediment of the
bottom. Caris only processes the raw backscatter, but the OMG
software can make calculations to show the bottom backscatter better. In
this paragraph we will explain how to process backscatter data with
the OMG software, and which methods exist.
- First I will explain how to process backscatter
- I will explain how to put this the easiest way in ArcMap
- Another method is making a geotiff of the backscatter map, which can also be imported in ArcMap
- Finally I will explain how to show backscatter in ArcMap without importing backscatter from omg.
1
. Process backscatter in OMG
When you set the
unravel script to output ss, there will now be a directory called ss..
it will contain the raw backscatter data.. There are three different
types as explained by JHC.. ss, ss_500 and ss_bp. You can now process
either one and have a look at in in jview.. If your unravel script did
not output ss, you can still run new_redoss by itself (new_redoss merged/*/*.merged).
2. Make a .mos
Normally we put the mos files in a folder called mos.
make_blank -boundsof merged/*/*merged
input same name (prefix) as used for DTM, I would use .bp for ss_bp, .roll for ss_500 and .ss for ss!!
use 8bit array
same mpp as in DTM
tomos prefix
mos2 ***.bp ss/JD***/*.ss
mos2 ***.roll ss/JD***/*.ss_500
mos2 ***.ss ss/JD***/*.ss_bp
jview prefix.mos
3. Convert this file to ESRI
edhead -dump_geotiff ***.8bit
r4toESRI -8bit_no_data 255
-real_8bit_range -108 20 -in ../MOS/***.ss.mos -out ***.mos
r4toESRI -in ***.r4 -out ***.dep
4. Make a geotiff
stretchacres
-low 140 -high 195 -in mos/JD121_sand.roll.mos -out temp.mos
mix_ci -ppm
-monofil -i mos/harbour.mos -m harbour.ppm
convert
harbour.ppm harbour.tif
edhead
-dump_geotiff mos/harbour.mos
geotifcp -g
mos/harbour.geo_meta harbour.tif harbour.geo.tif
5. Making backscatter in ArcMap
Is explained in the ArcMap section, under creating hillshaded grids.. link