ARCSI inputs & settings

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Arun Govind

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Jan 29, 2020, 12:55:08 PM1/29/20
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I have few questions for batch-processing L8 and S2 images. Thank you in advance!

1) For reprojecting, is it enough I specify the EPSG code? Or do I need to save the .wkt file in specific folder. E.g.

--projabbv osgb --outwkt BritishNationalGrid.wkt \
--outproj4 ./osgb_proj4.prj \ --projabbv osgb

2) Other DEMs are available, e.g. ALOS 12.5m, Canada DEM 20m, US NED 10m. As these are obviously finer and bigger files, will it affect performance if used?

3) Anyone tried with ALOS DEM 12.5m?

4) Do you mosaic the smaller DEMs to create a mosaic for state- or nation-level processing?

5) Can ARCSI now output directly to tiff? Or gdal translate is the option? How can I batch-convert all *.kea to *.tiff?
gdal_translate \ -of GTIFF /data/input_img.kea /data/output_img.tif

6) Manual says AOT is automatically calculated. So in batch-processing do I skip specifying it?

7) In some batch-processing I see these options skipped. I know I'll be processing for inland, vegetated areas for spring and summer time, so can I specify "Continental" and "MidlatitudeSummer"?
--aeropro Maritime \
--atmospro MidlatitudeSummer

8) Where and how do I apply scale factor to get in reflectance units between 0 and 1?
"--scalefac 0.001"

9) Is it still advised to edit script to change the default AOT step intervals to lower values? I.e. edit the arcsisensor.py script to reduce interval to 0.025 or 0.0125 rather than the default 0.05? See:
https://spectraldifferences.wordpress.com/2015/02/27/inverting-for-aerosol-optial-thickness-aot-using-arcsi/

Script shows 0.05 intervals.

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