Note: This addon document is for an older version of GRASS GIS that will be discontinued soon. You should upgrade your GRASS GIS installation, and read the current addon manual page.
NAME
i.lswt - Computes Lake Surface Water Temperatures (inland water bodies) from TOA Brightness Temperatures.
KEYWORDS
imagery,
LSWT,
MODIS,
AVHRR,
AATSR,
SEVIRI,
IMG
SYNOPSIS
i.lswt
i.lswt --help
i.lswt [-i] ainput=name binput=name basename=basename satellite=string [--overwrite] [--help] [--verbose] [--quiet] [--ui]
Flags:
- -i
- Display split-window coefficients and exit
- --overwrite
- Allow output files to overwrite existing files
- --help
- Print usage summary
- --verbose
- Verbose module output
- --quiet
- Quiet module output
- --ui
- Force launching GUI dialog
Parameters:
- ainput=name [required]
- Brightness Temperature (10.5 - 11.5 micro m)
- binput=name [required]
- Brightness Temperature (11.5 - 12.5 micro m)
- basename=basename [required]
- Name for output basename raster map(s)
- satellite=string [required]
- Satellite name
- Options: NOAA07-AVHRR, NOAA09-AVHRR, NOAA11-AVHRR, NOAA12-AVHRR, NOAA14-AVHRR, NOAA15-AVHRR, NOAA16-AVHRR, NOAA17-AVHRR, NOAA18-AVHRR, NOAA19-AVHRR, METOPA-AVHRR, ERS1-ATSR1, ERS2-ATSR2, Envisat-AATSR, Terra-MODIS, Aqua-MODIS, GOES8-IMG, GOES9-IMG, GOES10-IMG, GOES11-IMG, GOES12-IMG, GOES13-IMG, MSG1-SEVIRI, MSG2-SEVIRI
- NOAA07-AVHRR: Use split-window coefficients for NOAA07-AVHRR
i.lswt computes Lake Water Surface Temperature (LSWT) from
moderate resolution polar orbiting satellites with dual thermal channels.
Given the Top Of Atmosphere(TOA) Brightness Temperatures (BT) derived
from the thermal channels of the supported satellites, the module
computes surface temperature. For water surface
(lakes/inland water bodies), the module uses a simplified
non-linear split-window algorithm.
The non-linear split window equation used here is:
LSWT = Ti + c1 * (Ti - Tj) + c2 * (Ti - Tj) ^ 2 + c0
Where Ti and Tj are Brightness temperatures derived from dual thermal
channels 10.5 - 11.5 micro m and 11.5 - 12.5 micro m respectively.
The split window equation and the coefficients c0,c1,c2 are taken from Jimenez-Munoz et.al (2008).
r.mask vect=watermask cats=1 --o
i.lswt in1=NSS.LHRR.NP.D14177.S1312_b4 in2=NSS.LHRR.NP.D14177.S1312_b5 \
basename=NSS.LHRR.NP.D14177.S1312 satellite=NOAA19-AVHRR
The satellite specific split-window coefficients are taken from:
- Jimenez-Munoz, J.-C., Sobrino, J.A., 2008. Split-Window Coefficients for Land Surface
Temperature Retrieval From Low-Resolution Thermal Infrared Sensors.
IEEE Geoscience and Remote Sensing Letters 5, 806-809. (DOI)
A new method to develop continuos time series of LSWT from historical AVHRR is
explained below, uses the same split window technique implemented here:
- Pareeth, S., Delucchi, L., Metz, M., Rocchini, D., Devasthale, A., Raspaud, M.,
Adrian, R., Salmaso, N., Neteler, M., 2016. New Automated Method to Develop
Geometrically Corrected Time Series of Brightness Temperatures from Historical
AVHRR LAC Data. Remote Sensing 8, 169. (DOI)
i.landsat8.swlst,
i.emissivity
Sajid Pareeth; Fondazione Edmund Mach, Italy
SOURCE CODE
Available at:
i.lswt source code
(history)
Latest change: Mon Jun 28 07:54:09 2021 in commit: 1cfc0af029a35a5d6c7dae5ca7204d0eb85dbc55
Note: This addon document is for an older version of GRASS GIS that will be discontinued soon. You should upgrade your GRASS GIS installation, and read the current addon manual page.
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GRASS Development Team,
GRASS GIS 7.8.8dev Reference Manual