Arhanghelul Posted July 21, 2012 Report Share Posted July 21, 2012 Hello everyone ! I would like to use the LANDSAT thermal band no.6 to determine the Land Surface Temperature (LST) for a urban space. ("the urban heat island") Is there anyone who tried to use this ? I have found some studies about thermal Earth surface measuring using MODIS satelite and some research studies about the LANDSAT thermal band for measuring the LST for some different landscapes/ landuses. But I can't find some more detailed descriptions about how to use the LANDAT thermal band: the formulas or the algorithms for extracting LST from LANDSAT thermal band ? what software to use ? how to use the software and the sattelite images ? what is the difference between the band 6.1 and band 6.2 thermal band of LANSAT ETM+ and which one of them are used to create the LST ? what are the benefits and the limits of using thermal satelite images for detecting a "urban heat island" for example, or to determine differences between landuse/landcover types ? and more questions.......... Thx. Quote Link to comment Share on other sites More sharing options...
Team_Evil Posted July 22, 2012 Report Share Posted July 22, 2012 (edited) I suggest you to use first the guide of ENVI and erdas.... Are more accurate and you can find the differences between the landsat 7 termal bands... And check the plugins on the exelis website http://www.exelisvis.com/language/en-US/UserCommunity/CodeLibrary.aspx Edited July 22, 2012 by Team_Evil Quote Link to comment Share on other sites More sharing options...
3dbu Posted July 23, 2012 Report Share Posted July 23, 2012 check the paper and the specification of lanst 7 thermal band ...and then check the envi or erdas.... Quote Link to comment Share on other sites More sharing options...
Arhanghelul Posted July 23, 2012 Author Report Share Posted July 23, 2012 Thank you for your replyes ! Quote Link to comment Share on other sites More sharing options...
sanjoy Posted August 16, 2012 Report Share Posted August 16, 2012 You better use Landsat5TM or Landsat7 ETM+ 61 band for this purpose. You have to convert the Digital numbers into the Sensors spectral radience and than convert it Sensors spectral brightness or temperature in Kelvin unit. Quote Link to comment Share on other sites More sharing options...
Arhanghelul Posted August 21, 2012 Author Report Share Posted August 21, 2012 yes, I have done this with ETM+ band 6.1(spatial resolution 30 m resampled by USGSS from the 60 m resolution). I have determined the at-sensor brightness temperature LST sensor-satelit (I converted from Kelvin to Celsius) But the resulting LST is not the real ground soil temperature. For this, I have found some articles about using the Quin algorithm. The problem is that, this algorithm requires to know some parameters registered by gound meteorological stations exactly in the moment when the Landsat sensor created the image (08:49 PM) And I don't have those meteorological parameters ( air temperature, relative air moisture and emittance). In conclusion, the thermal band 6 of the LANDSAT is very useful to determine the LST at-sensor and compare the land use/land change with the changes of the LST ( or the ground temperature) Quote Link to comment Share on other sites More sharing options...
gisadept Posted August 21, 2012 Report Share Posted August 21, 2012 Arhanghelul, I don't know this makes part of your literature review, but it might be useful: http://naldc.nal.usda.gov/download/38199/PDF Quote Link to comment Share on other sites More sharing options...
Arhanghelul Posted August 21, 2012 Author Report Share Posted August 21, 2012 Thank you for the article, gisadept ! Quote Link to comment Share on other sites More sharing options...
linzheng007 Posted September 6, 2012 Report Share Posted September 6, 2012 yes, I have done this with ETM+ band 6.1(spatial resolution 30 m resampled by USGSS from the 60 m resolution). I have determined the at-sensor brightness temperature LST sensor-satelit (I converted from Kelvin to Celsius) But the resulting LST is not the real ground soil temperature. For this, I have found some articles about using the Quin algorithm. The problem is that, this algorithm requires to know some parameters registered by gound meteorological stations exactly in the moment when the Landsat sensor created the image (08:49 PM) And I don't have those meteorological parameters ( air temperature, relative air moisture and emittance). In conclusion, the thermal band 6 of the LANDSAT is very useful to determine the LST at-sensor and compare the land use/land change with the changes of the LST ( or the ground temperature) Hi. If you have derived bright temperature from TM6, the next step you should consider the emissivity of each classification( or pixels, or land cover). Sobrino and Qin's algorithms for retrieval of land surface temperature are recommended: 1. Land surface temperature retrieval from LANDSAT TM 5; 2. A mono-window algorithm for retrieving land surface temperature from Landsat TM data and its application to the Israel-Egypt border region. Above articles both deal with single channel of thermal data, and involving emissivity retrieval from NDVI. "By the way, Band 61 and 62, as you probably know, use exactly the same detector I believe (same wavelength and bandwidth) but the gain is set differently (61 is set to 'low' gain, 62 is set to 'high' gain). " cited from http://www.soest.haw...r/tmconvert.pdf Quote Link to comment Share on other sites More sharing options...
3dbu Posted September 10, 2012 Report Share Posted September 10, 2012 share the print screen for see your result and share the process used for have it like reference in the forum...regards Quote Link to comment Share on other sites More sharing options...
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