Notable updates include output to GeoTIFF files or output to separate NetCDF files per parameter. Users can specify a fixed aerosol epsilon, and a per pixel varying epsilon can be used with the SWIR based atmospheric correction. The cloud masking band and thresholds can be changed.
Download the latest version here. Further details in the processing settings pdf.
Updates since 20150306.0:
- - added option to output different individual parameters (e.g. rhow_655, rhow_865) or parameter groups (e.g. rhow, rtoa, l2par) to separate NetCDF files
- added option to output parameters to GeoTIFF files rather than NetCDF files (both full and cropped scenes)
- added option for user to specify a fixed aerosol epsilon value (between B4 and B5 for NIR, B6 and B7 for SWIR correction)
- added per pixel variable epsilon option for the SWIR correction
- added option to choose cloud masking channel (865, 1609, 2201 nm) and threshold, defaults are 1609 nm and 0.0215
- added option to use the Landsat Quality Assessment Band (BQA) masking information
- fixed bug that still occurred in some cases when given limits are outside the imageWith this option, pixels are masked when cloud confidence is medium or high (bit 15 set to 1) and when water confidence low or not defined (bit 5 set to 0), more info on the BQA see http://landsat.usgs.gov/L8QualityAssessmentBand.php/
This option is currently not recommended over the simple band threshold method:
- High water confidence levels are not given.
- Green fields often have a medium water confidence level, and similar to the threshold method, cloud shadows over land have medium water confidence levels.
- The algorithm returns “not defined” over turbid waters (bit 4 and 5 set to 0) that often have a high snow/ice confidence (bit 10 and 11 set).
- fixed bug for bulk processing where one image was not over the given limits
- fixed bug when loading old settings file: new settings not yet in that settings file are now set to defaults
- for bulk processing the image list can now be specified in a text file, for example:
- trailing slash is now added to the output path if neededidl -rt=acolite.sav -args image=imagelist.txt settings=acolite_settings_file
- save and restore buttons now remember last used directory
- fixed full tile pan-sharpening error
- added support for geolocation on full tile maps
- added Dogliotti et al. (2015) blended turbidity algorithm
Vanhellemont Q. & Ruddick K. (2014). Turbid wakes associated with offshore wind turbines observed with Landsat 8. Remote Sensing of Environment, Volume 145, pp. 105–115. Open Access: http://dx.doi.org/10.1016/j.rse.2014.01.009
Vanhellemont Q. & Ruddick K. (2015). Advantages of high quality SWIR bands for ocean colour processing: Examples from Landsat-8 Remote Sensing of Environment. Volume 161, pp. 89–106. Open Access: http://dx.doi.org/10.1016/j.rse.2015.02.007