Leaderboard

با سلام این سیمبولوژی بر اساس دستورالعمل تهیه و تدوین طرح بازنگری تفصیلی شهر شیراز ایجاد شده است. https://www.dropbox.com/sh/fxajmzgv0mkmiho/9ysoXJnhQo

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

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

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 !