achoknyz Posted August 7, 2013 Report Share Posted August 7, 2013 Dear All, Am trying to derive the land surface temperature of an area within the tropix in a bid to detect Urban Heat Island. Am proposing a time series to detect if at all it is existing. My biggest problem lies with deriving of the emissitivity where i have used formulars that have been advanced before but cant get values within the range, Anyone with a clear tutorial on how to derive LST using Envi or Erdas will be very helpful. Thank you in advance and Regards to all. Quote Link to comment Share on other sites More sharing options...
Arhanghelul Posted August 7, 2013 Report Share Posted August 7, 2013 (edited) For the Emissivity: I used the NDVI threshold method to derive the emissivity, developed bt Sobrino et al. (2004; 2008) and adapted to my study area (land cover/land use classes) here is a detailded document about emissivity methods: https://anonfiles.com/file/aa5097c0b21fe6ebf9abb5261bc33fce For the Land Surface Temperature (LST): I used the Radiative Transfer Equation - RTE (Berk et al. 1989) and the Atmospheric Correction Parameter Calculator (ACPC) to facilitate calculation for the atmospheric transmission, upwelling and downwelling radiances, with uncertaiuies in the inferred surface temperatures by approximately ±2-3 Kelvin degrees (Barsi et al. 2005) http://landsat.gsfc.nasa.gov/atm_corr/ Then, based on the formulaes, I extracted the Emissivity and the LST using the Model Maker in ERDAS. P.S: there is no method that can offer you a precise emissivity, 100%. The methods only offer an estimation for the emissivity and finally, for the LST. P.S: you can also make an account on ERDAS forum and search there for more informations. Good luck ! Edited August 7, 2013 by Arhanghelul 4 Quote Link to comment Share on other sites More sharing options...
poorbaby Posted August 8, 2013 Report Share Posted August 8, 2013 Dear All, Am trying to derive the land surface temperature of an area within the tropix in a bid to detect Urban Heat Island. Am proposing a time series to detect if at all it is existing. My biggest problem lies with deriving of the emissitivity where i have used formulars that have been advanced before but cant get values within the range, Anyone with a clear tutorial on how to derive LST using Envi or Erdas will be very helpful. Thank you in advance and Regards to all. Dear achoknyz, The first, if you want to detect Land surface temperature, you need to use band Thermal Infrared image (Landsat, aster)... If you use Landsat image, you use Envi software to process. You need realize steps: Step 1: Convert from digital number Values (DN) to spectral radiance values Step 2: Calculate value spectral radiance to temperature value 2 Quote Link to comment Share on other sites More sharing options...
Arhanghelul Posted August 8, 2013 Report Share Posted August 8, 2013 (edited) Here, you can see a model of LST estimation using ERDAS : http://giswin.geo.tsukuba.ac.jp/sis/tutorial/koko/SurfaceTemp/SurfaceTemperature.pdf This is a simple model, assuming that Emissivity is uniform (=1) and no atmospheric correction is done (no corrections for atmospheric transmission, upwelling and downwelling radiances). So, if you apply this example, you can obtain a relative LST, witch is not the real-ground LST, but is very used in most literature. For more details about LST algorithm, search for http://www.sciencedirect.com/science/article/pii/S0034425712004749 Edited August 8, 2013 by Arhanghelul 3 Quote Link to comment Share on other sites More sharing options...
3dbu Posted August 11, 2013 Report Share Posted August 11, 2013 nice , i did using the Lansat Band6 but i just it till to kelvin degree ...in envi have the it like sad poorbaby...pls share a napshot of your results. regards Quote Link to comment Share on other sites More sharing options...
poorbaby Posted August 12, 2013 Report Share Posted August 12, 2013 nice , i did using the Lansat Band6 but i just it till to kelvin degree ...in envi have the it like sad poorbaby...pls share a napshot of your results. regards hey captain, I have ever study science report for student in university about LST. You can reference my article: http://www.mediafire.com/view/h7a7sxvkkkk9u9d/LST_BCKH.ppt (But it's Language Vietnamese) . I hope it's helpful for you. Quote Link to comment Share on other sites More sharing options...
dragon_287 Posted November 17, 2013 Report Share Posted November 17, 2013 hey captain, I have ever study science report for student in university about LST. You can reference my article: http://www.mediafire.com/view/h7a7sxvkkkk9u9d/LST_BCKH.ppt (But it's Language Vietnamese) . I hope it's helpful for you. Many thanks, Poorbaby. Quote Link to comment Share on other sites More sharing options...
wajeehaniaz1 Posted December 26, 2013 Report Share Posted December 26, 2013 For the Emissivity: I used the NDVI threshold method to derive the emissivity, developed bt Sobrino et al. (2004; 2008) and adapted to my study area (land cover/land use classes) here is a detailded document about emissivity methods: https://anonfiles.com/file/aa5097c0b21fe6ebf9abb5261bc33fce For the Land Surface Temperature (LST): I used the Radiative Transfer Equation - RTE (Berk et al. 1989) and the Atmospheric Correction Parameter Calculator (ACPC) to facilitate calculation for the atmospheric transmission, upwelling and downwelling radiances, with uncertaiuies in the inferred surface temperatures by approximately ±2-3 Kelvin degrees (Barsi et al. 2005) http://landsat.gsfc.nasa.gov/atm_corr/ Then, based on the formulaes, I extracted the Emissivity and the LST using the Model Maker in ERDAS. P.S: there is no method that can offer you a precise emissivity, 100%. The methods only offer an estimation for the emissivity and finally, for the LST. P.S: you can also make an account on ERDAS forum and search there for more informations. Good luck ! will you kindly please send me any screen shots of the model??? Quote Link to comment Share on other sites More sharing options...
Arhanghelul Posted March 6, 2014 Report Share Posted March 6, 2014 Here, I have found a very useful tutorial about estimating LST from LANDSAT: http://fromgistors.blogspot.ro/2014/01/estimation-of-land-surface-temperature.html Quote Link to comment Share on other sites More sharing options...
Raghu Veer Degala Posted February 17, 2016 Report Share Posted February 17, 2016 I have a problem I want to find the land surface temperature of Bangkok using landsat8. I have everything to get it but the problem is landsat images are obtained during morning time but the maximum temperature will be afternoon period. How can I get the exact maximum temperatures of a day Quote Link to comment Share on other sites More sharing options...
markcres Posted February 20, 2016 Report Share Posted February 20, 2016 I have written a Windows package called LSTools. You can download for free here: http://www.ukscience.org/software.html (Bottom of list of Windows apps) It scans the text file accompanying Landsat data downloaded from GLOVIS and compiles the expressions to generate reflectance, radiance and temperature. You can just copy and paste into ArcGIS, QGIS or Erdas Imagine. It knows the constants and derives the correct solar zenith angle etc. Cheers Mark 3 Quote Link to comment Share on other sites More sharing options...
am2 Posted February 22, 2016 Report Share Posted February 22, 2016 I have written a Windows package called LSTools. You can download for free here: http://www.ukscience.org/software.html (Bottom of list of Windows apps) It scans the text file accompanying Landsat data downloaded from GLOVIS and compiles the expressions to generate reflectance, radiance and temperature. You can just copy and paste into ArcGIS, QGIS or Erdas Imagine. It knows the constants and derives the correct solar zenith angle etc. Cheers Mark Dear Mark, Can we use your application as an extention for arcmap or Envi or even stand alone app? What do you think of this? thanks Quote Link to comment Share on other sites More sharing options...
markcres Posted February 22, 2016 Report Share Posted February 22, 2016 Dear Mark, Can we use your application as an extention for arcmap or Envi or even stand alone app? What do you think of this? thanks Hi It is already a standalone app. You install it like any Windows software and it creates an icon for you. Cheers Mark 1 Quote Link to comment Share on other sites More sharing options...
am2 Posted February 22, 2016 Report Share Posted February 22, 2016 Hi It is already a standalone app. You install it like any Windows software and it creates an icon for you. Cheers Mark Hi, Thank you for your information...I think if we can make a complate your app and make it an stand alone aplication which do process on its own without need to use erdas or envi,it could be down using gdal and dotspatial Quote Link to comment Share on other sites More sharing options...
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