4.3. Corrected Reflectance Frontend¶
The Corrected Reflectance Frontend operates on corrected reflectance files created from
VIIRS Science Data Record (SDR) files or MODIS Level 1B (L1B) files. Currently corrected reflectance
files are created by third part software developed by NASA.The CREFL_SPA algorithm
for MODIS and CVIIRS_SPA algorithm for VIIRS can be found here:
http://directreadout.sci.gsfc.nasa.gov/?id=software
Polar2Grid uses its own patched version of the CREFL processing code for VIIRS data. This code is available in the main code repository and fixes a few bugs that were not fixed in the original CREFL code at the time of writing. After processing the output can be provided to Polar2Grid to create true color images or other RGB images.
New in version 2.0: CREFL software is automatically called when the CREFL frontend is provided SDR or L1B files.
Note
The crefl2gtiff.sh script is hardcoded to create true color images by default since this is the most common
use case for the CREFL frontend. This is equivalent to p2g_glue crefl gtiff true_color ... since the products
needed for true color are created by default.
The CREFL frontend accepts output from MODIS and VIIRS corrected reflectance processing. If provided with SDR files it will attempt to call the proper programs to convert the files. The required commands that must be available are:
- h5SDS_transfer_rename
- cviirs (for VIIRS corrected reflectance)
- crefl (for MODIS corrected reflectance)
The CREFL software also requires ancillary data in the form of tbase.hdf and CMGDEM.hdf files for the
MODIS and VIIRS processing respectively. These files are provided in the CSPP software bundle and are automatically
detected by the software. Alternate locations can be specified with the P2G_CMODIS_ANCPATH and
P2G_CVIIRS_ANCPATH environment variables.
The following products are provided by this frontend:
Product Name Description viirs_crefl01 Corrected Reflectance from VIIRS M05 Band viirs_crefl02 Corrected Reflectance from VIIRS M07 Band viirs_crefl03 Corrected Reflectance from VIIRS M03 Band viirs_crefl04 Corrected Reflectance from VIIRS M04 Band viirs_crefl05 Corrected Reflectance from VIIRS M08 Band viirs_crefl06 Corrected Reflectance from VIIRS M10 Band viirs_crefl07 Corrected Reflectance from VIIRS M11 Band viirs_crefl08 Corrected Reflectance from VIIRS I01 Band viirs_crefl09 Corrected Reflectance from VIIRS I02 Band viirs_crefl10 Corrected Reflectance from VIIRS I03 Band modis_crefl01_1000m Corrected Reflectance from MODIS Band 1 modis_crefl02_1000m Corrected Reflectance from MODIS Band 2 modis_crefl03_1000m Corrected Reflectance from MODIS Band 3 modis_crefl04_1000m Corrected Reflectance from MODIS Band 4 modis_crefl05_1000m Corrected Reflectance from MODIS Band 5 modis_crefl06_1000m Corrected Reflectance from MODIS Band 6 modis_crefl07_1000m Corrected Reflectance from MODIS Band 7 modis_crefl01_500m Corrected Reflectance from MODIS Band 1 modis_crefl02_500m Corrected Reflectance from MODIS Band 2 modis_crefl03_500m Corrected Reflectance from MODIS Band 3 modis_crefl04_500m Corrected Reflectance from MODIS Band 4 modis_crefl05_500m Corrected Reflectance from MODIS Band 5 modis_crefl06_500m Corrected Reflectance from MODIS Band 6 modis_crefl07_500m Corrected Reflectance from MODIS Band 7 modis_crefl01_250m Corrected Reflectance from MODIS Band 1 modis_crefl02_250m Corrected Reflectance from MODIS Band 2 modis_crefl03_250m Corrected Reflectance from MODIS Band 3 modis_crefl04_250m Corrected Reflectance from MODIS Band 4
| author: | David Hoese (davidh) |
|---|---|
| organization: | Space Science and Engineering Center (SSEC) |
| copyright: | Copyright (c) 2012-2015 University of Wisconsin SSEC. All rights reserved. |
| date: | Dec 2014 |
| license: | GNU GPLv3 |
4.3.1. Command Line Arguments¶
usage: p2g_glue crefl <backend> [-h] [--list-products] [--no-tc]
[-p PRODUCTS [PRODUCTS ...]] [--true-color]
[--false-color]
- Options:
--list-products=False List available frontend products and exit --no-tc=True Don’t use terrain-corrected navigation (VIIRS products only) -p, --products Specify frontend products to process --true-color Attempt to extract the products that could be used to create true color images --false-color Attempt to extract the products that could be used to create false color images
