I study plant ecosystem dynamics using Landsat images in my work. One of the useful indices is GVI. I know it can be counted for Landsat 8 images but don't know how. Can anyone help me?
Dear Maria,
GVI or Tasseled cap greeness index calculated using fallowing formula for Landsat 8:
-0.2941*Band2 - 0.243 * Band3 -0.5424 * Band4 + 0.7276 * Band5 + 0.0713 * Band6 - 0.1608 * Band7
For reference:
Muhammad Hasan Ali Baig, Lifu Zhang, Tong Shuai & Qingxi Tong (2014)Derivation of a tasselled cap transformation based on Landsat 8 at-satellite reflectance, Remote Sensing Letters, 5:5, 423-431, DOI: 10.1080/2150704X.2014.915434
You can do this calculation using Erdas imagine model maker or Idrisi image calculater or ArcGIS 10XX version map algebra/raster calculation tools.
In the result negative values refers no vegetation positive values refers vegetative land.
I hope it would be helpful,
Onur...
If you decide to use Grass GIS 7.0 RC1 (http://grass.osgeo.org/news/40/15/GRASS-GIS-7-0-0-RC1/) it can be done using the module i.tasscap.
Check here http://grass.osgeo.org/grass70/manuals/i.tasscap.html
I am not sure, if GRASS 6.4 supports Landsat 8 for this module.
Please give the sensor as "landsat8_oli" and GRASS will calculate all the tasseled cap components for you.
Make sure your Landsat 8 image has bands 2, 3, 4, 5, 6, 7 in that order, to ensure proper bands taken for calculation.
Hope it helps.
http://grass.osgeo.org/grass70/manuals/i.tasscap.html
Thank you for your answers!
It seems to me its time to go on with Grass 7.0. Grass 6.4 do not support L8. Although I now count GVI values by handle entering of formula referred by Onur. Version 7.0 seemes to be much better of course.
yes, I agree.
Grass 7.0 would be ideal to use with more functionalities and optimized libraries. The processes will be much faster with Grass 7.0
- Badges
- Science topic
- Similar topics
- Biological Science
- Biota
- Eukaryota
- Viridiplantae
- Streptophyta
- Plants