cgtasseledcapcoeffs.pro
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; docformat = 'rst'
;
; NAME:
; cgTasseledCapCoeffs
;
; PURPOSE:
;
; This function returns tasseled cap coefficients from various sources to perform
; the tasseled cap transformation on appropriate (e.g. LandSat) images.
;******************************************************************************************;
; ;
; Copyright (c) 2012, by Fanning Software Consulting, Inc. All rights reserved. ;
; ;
; Redistribution and use in source and binary forms, with or without ;
; modification, are permitted provided that the following conditions are met: ;
; ;
; * Redistributions of source code must retain the above copyright ;
; notice, this list of conditions and the following disclaimer. ;
; * Redistributions in binary form must reproduce the above copyright ;
; notice, this list of conditions and the following disclaimer in the ;
; documentation and/or other materials provided with the distribution. ;
; * Neither the name of Fanning Software Consulting, Inc. nor the names of its ;
; contributors may be used to endorse or promote products derived from this ;
; software without specific prior written permission. ;
; ;
; THIS SOFTWARE IS PROVIDED BY FANNING SOFTWARE CONSULTING, INC. ''AS IS'' AND ANY ;
; EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES ;
; OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT ;
; SHALL FANNING SOFTWARE CONSULTING, INC. BE LIABLE FOR ANY DIRECT, INDIRECT, ;
; INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED ;
; TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; ;
; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ;
; ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ;
; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS ;
; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. ;
;******************************************************************************************;
;
;+
; This function returns tasseled cap coefficients from various sources to perform
; the tasseled cap transformation on appropriate (e.g. LandSat) images. The program
; requires that one of the keywords be set.
;
; :Categories:
; Utility
;
; :Keywords:
; 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.
; Also: http://www.sjsu.edu/faculty/watkins/tassel.htm.
; 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.
; Also: http://www.sjsu.edu/faculty/watkins/tassel.htm.
;
; :Examples:
; tasseledCapTransformedImage = landsat_tm_image ## cgTasselecCapCoeffs(/TM)
;
; :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.
;
; :Copyright:
; Copyright (c) 2012, Fanning Software Consulting, Inc.
;-
FUNCTION cgTasseledCapCoeffs, $
ENVI=envi_tm5, $
ETM=etm_landsat, $
IMAGINE=mss_imagine, $
LS4=landsat_4, $
LS5=landsat_5, $
MSS=mss_landsat, $
QUICKBIRD=quickbird, $
TM=tm_landsat
On_Error, 2 ; Return to caller.
CASE 1 OF
Keyword_Set(landsat_4): BEGIN
; Coefficients from: http://www.ciesin.org/docs/005-419/tab1.gif.
; http://www.ciesin.org/docs/005-419/005-419.html. TM-4 Apply to DN values.
coefficients = FltArr(6,3)
; Band1 Band2 Band3 Band4 Band5 Band7
coefficients[*,0] = [ 0.3037, 0.2793, 0.4743, 0.5585, 0.5082, 0.1863] ; Brightness
coefficients[*,1] = [-0.2848, -0.2435, -0.5436, 0.7243, 0.0840, -0.1800] ; Greenness
coefficients[*,2] = [ 0.1509, 0.1973, 0.3279, 0.3406, -0.7112, -0.4572] ; Yellowness
END
Keyword_Set(landsat_5): BEGIN
; Coefficients from: http://www.ciesin.org/docs/005-419/tab2.gif.
; http://www.ciesin.org/docs/005-419/005-419.html. TM-5 Apply to DN values.
coefficients = FltArr(6,3)
; Band1 Band2 Band3 Band4 Band5 Band7
coefficients[*,0] = [ 0.2909, 0.2493, 0.4806, 0.5568, 0.4438, 0.1706] ; Brightness + 10.3695 additive term
coefficients[*,1] = [-0.2728, -0.2174, -0.5508, 0.7221, 0.0733, -0.1648] ; Greenness + -0.7310 additive term
coefficients[*,2] = [ 0.1446, 0.1761, 0.3322, 0.3396, -0.6210, -0.4186] ; Yellowness + -3.3828 additive term
END
Keyword_Set(envi_tm5): BEGIN
; Coefficients from: http://www.exelisvis.com/language/en-US/UserCommunity/UserForums/forumid/29/threadid/12985/scope/posts.aspx.
; TM-5 (although someone claims these are TM-4 values!). Apply to DN values.
coefficients = FltArr(6,3)
; Band1 Band2 Band3 Band4 Band5 Band7
coefficients[*,0] = [ 0.33183, 0.33121, 0.55177, 0.42514, 0.48087, 0.25252] ; Brightness
coefficients[*,1] = [-0.24717, -0.16263, -0.40639, 0.85469, 0.05493, -0.11749] ; Greenness
coefficients[*,2] = [ 0.13929, 0.22490, 0.40359, 0.25178, -0.70133, -0.45732] ; Yellowness
END
Keyword_Set(mss_landsat): BEGIN
; Coefficients from: http://web.pdx.edu/~jduh/courses/Archive/geog481w07/Students/Marcello_TasselledCap.pdf.
; These are from R.J Kauth and G.S. Thomas original 1976 article: http://docs.lib.purdue.edu/cgi/viewcontent.cgi?article=1160&context=lars_symp&sei-redir=1&referer=http%3A%2F%2Fscholar.google.com%2Fscholar_url%3Fhl%3Den%26q%3Dhttp%3A%2F%2Fdocs.lib.purdue.edu%2Fcgi%2Fviewcontent.cgi%253Farticle%253D1160%2526context%253Dlars_symp%26sa%3DX%26scisig%3DAAGBfm3MWqyNxnJ7UYudI9atplMsxTPgzw%26oi%3Dscholarr#search=%22http%3A%2F%2Fdocs.lib.purdue.edu%2Fcgi%2Fviewcontent.cgi%3Farticle%3D1160%26context%3Dlars_symp%22
coefficients = FltArr(4,4)
; Band1 Band2 Band3 Band4
coefficients[*,0] = [ 0.4330, 0.6320, 0.5860, 0.2640] ; Brightness
coefficients[*,1] = [-0.2900, -0.5620, 0.6000, 0.4910] ; Greenness
coefficients[*,2] = [-0.8290, 0.5220, -0.0390, 0.1940] ; Yellowness
coefficients[*,3] = [ 0.2230, 0.0120, -0.5430, 0.8100] ; Yellowness
END
Keyword_Set(mss_imagine): BEGIN
; Coefficients from ERDAS Imagine software
coefficients = FltArr(4,3)
; Band1 Band2 Band3 Band4
coefficients[*,0] = [ 0.332, 0.603, 0.675, 0.262] ; Brightness
coefficients[*,1] = [-0.283, -0.660, 0.577, 0.388] ; Greenness
coefficients[*,2] = [-0.899, 0.428, 0.076, -0.041] ; Yellowness
END
Keyword_Set(quickbird): BEGIN
; Gram-Schmidt coefficients from: http://www.asprs.org/a/publications/proceedings/pecora16/Yarbrough_L.pdf
coefficients = FltArr(4,3)
; Band1 Band2 Band3 Band4
coefficients[*,0] = [ 0.319, 0.543, 0.490, 0.604] ; Brightness
coefficients[*,1] = [-0.121, -0.331, -0.517, 0.780] ; Greenness
coefficients[*,2] = [ 0.652, 0.375, -0.639, -0.163] ; Yellowness
END
Keyword_Set(TM_landsat): BEGIN
; Coefficients from: http://web.pdx.edu/~jduh/courses/Archive/geog481w07/Students/Marcello_TasselledCap.pdf.
; Should be applied to reflectance values only? Of the same order as ENVI TM-5.
coefficients = FltArr(6,3)
; Band1 Band2 Band3 Band4 Band5 Band7
coefficients[*,0] = [ 0.3037, 0.2793, 0.4343, 0.5585, 0.5082, 0.1863] ; Brightness
coefficients[*,1] = [-0.2848, -0.2435, -0.5436, 0.7243, 0.0840, -0.1800] ; Greenness
coefficients[*,2] = [ 0.1509, 0.1793, 0.3299, 0.3406, -0.7112, -0.4572] ; Yellowness
END
Keyword_Set(etm_landsat): BEGIN
; Coefficients from: http://landcover.usgs.gov/pdf/tasseled.pdf.
coefficients = FltArr(6,6)
; Band1 Band2 Band3 Band4 Band5 Band7
coefficients[*,0] = [ 0.3561, 0.3972, 0.3904, 0.6966, 0.2286, 0.1596] ; Brightness
coefficients[*,1] = [-0.3344, -0.3544, -0.4556, 0.6966, -0.0242, -0.2630] ; Greenness
coefficients[*,2] = [ 0.2626, 0.2141, 0.0926, 0.0656, -0.7629, -0.5388] ; Yellowness
coefficients[*,3] = [ 0.0805, -0.0498, 0.1950, -0.1327, 0.5752, -0.7775] ; Fourth
coefficients[*,4] = [-0.7252, -0.0202, 0.6683, 0.0631, -0.1494, -0.0274] ; Fifth
coefficients[*,5] = [ 0.4000, -0.8172, 0.3832, 0.0602, -0.1095, 0.0985] ; Sixth
END
ELSE: Message, 'Must set a keyword to specify type of Tasseled Cap coefficients required.'
ENDCASE
; Transpose the coefficient matrix so that you can apply image ## coefficients to get tasseled cap transformations.
; Note that image bands must be in columns, with band number in rows in the "image" variable.
RETURN, Transpose(coefficients)
END