.\

cgtasseledcap.pro

top cgTasseledCap

Utility

result = cgTasseledCap(input [, /DISPLAY] [, /ENVI] [, /ETM] [, /IMAGINE] [, /LS4] [, /LS5] [, /MSS] [, /QUICKBIRD] [, /TM])

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.

Parameters

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 information

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

Copyright:

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.

File attributes

Modification date:	Fri Mar 27 11:07:39 2015
Lines:	215
Docformat:	rst rst

Coyote Graphics Routines

Date: Fri Mar 27 12:14:20 2015