CGTASSELEDCAP
This function returns an image transformed by tasseled cap coefficients. The number of
bands returned depends on the shape of the tasseled cap coefficients, but at least three
bands are always returned: brightness, greenness, and yellowness.
Categories
Utility
Params
input: in, required, type=varies
The input may be either an image to be transformed or the name of an image
file that can be read with READ_IMAGE (e.g., a GeoTiff file).
Keywords
display: in, optional, type=boolean
Set this keyword to display the brightness, greenness, and yellowness band in
a display window.
envi: in, optional, type=boolean
Set this keyword to return the tasseled cap coeficients used by ENVI 4.8.
These are reported (by ITTVIS) to be for LandSat-5 TM data, although others
report these are in error for TM-5 data and really apply to TM-4 data.
Reference: http://www.exelisvis.com/language/en-US/UserCommunity/UserForums/forumid/29/threadid/12985/scope/posts.aspx.
etm: in, optional, type=boolean
Set this keyword to return the tasseled cap coeficients proposed by the USGS for
LandSat-7 ETM+ images. Note that these values should be applied to reflectances.
Reference: http://landcover.usgs.gov/pdf/tasseled.pdf.
imagine: in, optional, type=boolean
Set this keyword to return the tasseled cap coeficients used by the ERDAS Imagine software
for LandSat-5 data.
ls4: in, optional, type=boolean
Set this keyword to return the tasseled cap coeficients reported by Crist, Laurin and Cicone
for LandSat-4 imagery. Reference: http://www.ciesin.org/docs/005-419/005-419.html.
ls5: in, optional, type=boolean
Set this keyword to return the tasseled cap coeficients reported by Crist, Laurin and Cicone
for LandSat-5 imagery. Reference: http://www.ciesin.org/docs/005-419/005-419.html.
mss: in, optional, type=boolean
Set this keyword to return the tasseled cap coeficients originally reported by R.J Kauth and G.S. Thomas
for MSS LandSat imagery. Reference: http://web.pdx.edu/~jduh/courses/Archive/geog481w07/Students/Marcello_TasselledCap.pdf.
quickbird: in, optional, type=boolean
Set this keyword to return the tasseled cap Graham-Schmidt coeficients reportedly used for Quickbird imagery.
Reference: http://www.asprs.org/a/publications/proceedings/pecora16/Yarbrough_L.pdf
tm: in, optional, type=boolean
Set this keyword to return the tasseled cap coeficients originally proposed for TM imagery by Kauth and Thomas.
Reference: http://web.pdx.edu/~jduh/courses/Archive/geog481w07/Students/Marcello_TasselledCap.pdf.
Examples
tasselImage = cgTasseledCap('landsatImageFile.tif', /TM, /Display)
Author
FANNING SOFTWARE CONSULTING::
David W. Fanning
1645 Sheely Drive
Fort Collins, CO 80526 USA
Phone: 970-221-0438
E-mail: david@idlcoyote.com
Coyote's Guide to IDL Programming: http://www.idlcoyote.com
History
Written, 24 August 2012, by David W. Fanning.
Fixed a dimension problem caused by forgetting a Transpose operation. 17 October 2012. DWF.
Fixed a type problem with the ETM keyword. 19 October 2012. DWF.
Copyright
Copyright (c) 2012, Fanning Software Consulting, Inc.