achoknyz Posted September 4, 2013 Report Share Posted September 4, 2013 Hello Guys, Kindly help me with a clear formula on how to calculate emissivity from NDVI. If possible step by step Regards Quote Link to comment Share on other sites More sharing options...
Arhanghelul Posted September 4, 2013 Report Share Posted September 4, 2013 why do you need to calculate emissivity ? Quote Link to comment Share on other sites More sharing options...
achoknyz Posted September 6, 2013 Author Report Share Posted September 6, 2013 @sergeant, wish to derive emissivity to enable me calculate land surface temperature Quote Link to comment Share on other sites More sharing options...
Arhanghelul Posted September 6, 2013 Report Share Posted September 6, 2013 Here: http://www.gisarea.com/index.php?/topic/3494-deriving-lst-from-landsat-data-tmetm/ Quote Link to comment Share on other sites More sharing options...
shangoolabadi Posted September 6, 2013 Report Share Posted September 6, 2013 i,m working on my project which is about : monitoring urban heat islands with landsat TM images.when i want to calculate emissivity from the equation given by Van de Griend and Owe (1993),i can,t done it perfectly.i examine it in many of softwares such as: ilwis,erdas imagine 2011,ArcGIS10.1 but i could not set all of the conditions: if ndvi< -0.185 emissivity=0.995 if ndvi>= -0.185 and ndvi<0.157 emissivity=0.970 if ndvi>=0.157 and ndvi<=0.727 emissivity= 1.0098+0.047*ln(ndvi) if ndvi>0.727 emissivity=0.990 in ArcGIS 10.1/spatial analyst/con i performed bu i could not done it i would be so tankful if you help me to solve my problem. Quote Link to comment Share on other sites More sharing options...
Arhanghelul Posted September 6, 2013 Report Share Posted September 6, 2013 I used the Sobrino (2004; 2008) equation for calculating emissivity, using Model Maker in ERDAS. You can find this in the folder that I gived you. (the link above). Here is another article that uses the Sobrino method for emissivity (pg. 23): http://www.geosymp.wnoz.us.edu.pl/trendy/ctigs/4.pdf Quote Link to comment Share on other sites More sharing options...
rahmansunbeam Posted September 7, 2013 Report Share Posted September 7, 2013 i,m working on my project which is about : monitoring urban heat islands with landsat TM images.when i want to calculate emissivity from the equation given by Van de Griend and Owe (1993),i can,t done it perfectly.i examine it in many of softwares such as: ilwis,erdas imagine 2011,ArcGIS10.1 but i could not set all of the conditions: if ndvi< -0.185 emissivity=0.995 if ndvi>= -0.185 and ndvi<0.157 emissivity=0.970 if ndvi>=0.157 and ndvi<=0.727 emissivity= 1.0098+0.047*ln(ndvi) if ndvi>0.727 emissivity=0.990 in ArcGIS 10.1/spatial analyst/con i performed bu i could not done it i would be so tankful if you help me to solve my problem. Try ENVI's SPEAR Vegetation Delineation > Density Slicing tool http://www.exelisvis.com/docs/SPEARVegetationDelineation.html Quote Link to comment Share on other sites More sharing options...
shangoolabadi Posted September 7, 2013 Report Share Posted September 7, 2013 i,m so thankful for your response guys i solve m problem with spatial modeler in erdas imagine i want to calculate land surface temperature with this formula: LST = brightness temperature / 1 + (11.5 + brightness temperature /0.01438) * ln(emissivity) i have brightness temperature(Tb) file and i calculate emissivity but i can,t calculate LST i,ll be so thankful about your response and attention the best regard Quote Link to comment Share on other sites More sharing options...
Arhanghelul Posted September 7, 2013 Report Share Posted September 7, 2013 (edited) I don't understand your formula. Where did you found that ? I know 3 methods for LST calculation using Landsat thermal images: 1. the mono-window algorithm developed by Qin http://www.bgu.ac.il/bidr/research/phys/remote/Papers/2001-Qin_Mono_Window_IJRS_01.pdf 2. the Sobrino algorithm, by Sobrino et al. ftp://atmosfera.cl/pub/elias/Paula/2004_Sobrino_RSE.pdf 3. the Radiative Transfer Equation (RTE) http://www.uv.es/ucg/articulos/2005/Publications_2004_10.pdf and http://people.eri.ucsb.edu/~dozier/Pubs/WanDozierIEEE1989.pdf So, what is your method ? Edited September 7, 2013 by Arhanghelul 1 Quote Link to comment Share on other sites More sharing options...
shangoolabadi Posted September 7, 2013 Report Share Posted September 7, 2013 I don't understand your formula. Where did you found that ? I know 3 methods for LST calculation using Landsat thermal images: 1. the mono-window algorithm developed by Qin http://www.bgu.ac.il/bidr/research/phys/remote/Papers/2001-Qin_Mono_Window_IJRS_01.pdf 2. the Sobrino algorithm, by Sobrino et al. ftp://atmosfera.cl/pub/elias/Paula/2004_Sobrino_RSE.pdf 3. the Radiative Transfer Equation (RTE) http://www.uv.es/ucg/articulos/2005/Publications_2004_10.pdf and http://people.eri.ucsb.edu/~dozier/Pubs/WanDozierIEEE1989.pdf So, what is your method ? I wanted to use Qin 2001 method to retrieval LST but i could not calculating its parameters the method of sobrino 2004 was not done since we face to lake of some atmospheric datas then i studied the paper of Qihao Weng(2004) "Estimation of land surface temperature–vegetation abundance relationship for urban heat island studies " which is published in Estimation of land surface temperature–vegetation abundance relationship for urban heat island studies.I decided to use the method that was been used in that paper.here you can see this paper : http://www.utsa.edu/lrsg/Teaching/EES5053_Geo4093/Labs/Wengetal.pdf Quote Link to comment Share on other sites More sharing options...
Arhanghelul Posted September 8, 2013 Report Share Posted September 8, 2013 Make as you whant. Is your decision. Anyway, no method is 100% real. You will have relative values for the LST. Quote Link to comment Share on other sites More sharing options...
hidayat.arif19 Posted October 24, 2013 Report Share Posted October 24, 2013 dear all,i have question about alghorithm Qin (LST) Qin use 6s Model Correction for band 3 and band 4 to get ndvi --> emmisivityhow use 6s model? and what software to process it?Thanks Quote Link to comment Share on other sites More sharing options...
Arhanghelul Posted October 25, 2013 Report Share Posted October 25, 2013 dear all, i have question about alghorithm Qin (LST) Qin use 6s Model Correction for band 3 and band 4 to get ndvi --> emmisivity how use 6s model? and what software to process it? Thanks I don't know how Qin used the 6S correction to extract the emissivity, but you can find other methos for emissivity. Examples: Sobrino method, Van de Griend and Owe, Valor and Caselles, etc... here, the article about this: http://sourcedb.cas.cn/sourcedb_igsnrr_cas/zw/lw/201301/P020130115365414388306.pdf Quote Link to comment Share on other sites More sharing options...
hidayat.arif19 Posted October 26, 2013 Report Share Posted October 26, 2013 I don't know how Qin used the 6S correction to extract the emissivity, but you can find other methos for emissivity. Examples: Sobrino method, Van de Griend and Owe, Valor and Caselles, etc... here, the article about this: http://sourcedb.cas.cn/sourcedb_igsnrr_cas/zw/lw/201301/P020130115365414388306.pdf Thanks Arhanghelul for your question and link journal... Btw i forgot said about 6s model. it is atmospheric correction method for process band 3 n 4 before extract emissivity (in jurnal Qin, he use sobrino method for extract emissivity)... Quote Link to comment Share on other sites More sharing options...
Arhanghelul Posted October 26, 2013 Report Share Posted October 26, 2013 (edited) I know, for example, that there is an Atmospheric Correction Parameter Calculator web-tool developed by Barsi, for Single Thermal Band Instruments ( Landsat images) You can find more informations about this tool, here: http://atmcorr.gsfc.nasa.gov/ Other Atmospheric correction tools are incorporated in software packages, such as : ENVI ( FLAASH module), PCI Geomatica (ATMCOR), etc, etc..... here a tutorial video: http://www.youtube.com/watch?v=bCrWFhlq9yE Edited October 26, 2013 by Arhanghelul 1 Quote Link to comment Share on other sites More sharing options...
hidayat.arif19 Posted October 27, 2013 Report Share Posted October 27, 2013 Thanks arhanghelul....I will try it by the way iam sorry, I wrong wrote question, it should answer in "Thanks Arhanghelul for your question and link journal..." (above) 1 Quote Link to comment Share on other sites More sharing options...
whocares1980 Posted November 5, 2013 Report Share Posted November 5, 2013 Hi, You all have forgotten another method based on LULC classification where each land use type is given a specific emissivity>>> NDVI method does not work in all conditions. Quote Link to comment Share on other sites More sharing options...
Arhanghelul Posted November 5, 2013 Report Share Posted November 5, 2013 (edited) Hi, You all have forgotten another method based on LULC classification where each land use type is given a specific emissivity>>> NDVI method does not work in all conditions. Yes, is true. But it has also a problem: you need to know the emissivity values for the LULC. I found some articles about this method. Some researchers used the MODIS emissivity values for LULC classes to estimate the LST. Edited November 5, 2013 by Arhanghelul Quote Link to comment Share on other sites More sharing options...
wajeehaniaz1 Posted December 26, 2013 Report Share Posted December 26, 2013 Hello Guys, Kindly help me with a clear formula on how to calculate emissivity from NDVI. If possible step by step Regards hi.... did you find the step by step method for calculating emmisivity from LANDSAT 5... kindly guide me tooo Quote Link to comment Share on other sites More sharing options...
dr_s1ngh Posted December 27, 2013 Report Share Posted December 27, 2013 Hey Guys!! If u have samples of emissivity from around 12 or 15 NDVI values then u can make a scatter plot and fit the regression line ... and type the regression equation in ENVI band math... Quote Link to comment Share on other sites More sharing options...
enganga Posted February 5, 2014 Report Share Posted February 5, 2014 Achoknyz Usipopata 1st class usirudi apa Quote Link to comment Share on other sites More sharing options...
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