msavi2

Contents: Description, Arguments, Usage, Examples, Images, Related Functions, Source Supported Under Version: > 1.00 Current .dvrc Version: 1.00 Description Generates a Modified Soil-Adjusted Vegetation Index 2 map Arguments and Return Values Arguments: 1- or 2-dimensional greyscale images representing near-infrared and red spectral bands (both are required) Return Value: A float greyscale image Usage Syntax: msavi(nir, red) This function is part of the larger class of vegetation-index methods used in satellite image-processing. See ndi or this discussion of related functions for more detailed information. MSAVI2 is of the subtype which will return only positive values. Greater values indicate that the presence of vegetation (especially healthier vegetation) is more likely. The formula used is: MSAVI2 = (2 * (NIR + 1) - sqrt((2 * NIR + 1)^2 - 8 * (NIR - Red))) / 2 This formula was obtained from "Vegetation Detection for Mobile Robot Navigation" (David M. Bradley, Scott M. Thayer, Anthony Stentz, and Peter Rander, 2004). Examples dv> nir 2000x1000x1 array of float, bsq format [8,000,000 bytes] dv> r 2000x1000x1 array of float, bsq format [8,000,000 bytes] dv> result = msavi2(nir, r) Generating a Modified Soil-Adjusted Vegetation Index 2 image. 2000x1000x1 array of float, bsq format [8,000,000 bytes] dv> max(result) 1.500001431 dv> min(result) 0.1437156200 Images Full set of LandSat 7 imagery: Output of msavi():

DavinciWiki Mini-Nav Bar Contents Functions Function Categories Common Procedures Glossary Download Davinci Change Log News Mailing List Contact Developers davinci-dev [AT] mars.asu.edu All other topics See navigation on the left Related Functions arvi asvi avi evi gemi kt1 kt2 kt3 kt4 kt5 kt6 msavi ndi slavi dshadow.dvrc (Beta) msavi2() Recent Library Changes Change Log Created On: 07-16-2012 Modified On: 05-02-2013