TY - JOUR JF - kntu-jgit JO - jgit VL - 3 IS - 3 PY - 2015 Y1 - 2015/12/01 TI - Surface Temperature and Emissivity estimation and isothermal area detection during crop growth stages TT - برآورد گسیلمندی و دمای سطحی و تشخیص مناطق هم‌دما در مراحل مختلف رشد پوشش گیاهی N2 - Today, the extraction of land surface temperature (LST) from satellite imagery for many environmental studies, particularly the applications related to water resources management over agricultural sites, is very important. The extracted LST can be used to check the status of plant growth and crop water demand management. Recently the OLI and TIR data sets from Landsat 8 were used in vegetation studies and surface temperature estimation. In this research, the variations of corn surface temperature during its growth stages were examined. In order to minimize the soil influence on canopy spectra, the SAVI were used. The emissivity was estimated by using thresholding on NDVI and vegetation fraction cover and surface temperature were assessed by using single channel algorithm. After that isothermal areas were detected using SAVI and thermal image. Finally, corn growth conditions were studied by examining surface temperature in growth stages. The comparison of results with ground data, show the average correlation efficiency more than 0.92 and average RMSE less than 1.5. SP - 95 EP - 110 AU - Rezaei, Yousef AU - Najafi, Zahra AU - Akhavan, Samira AD - Bu-Ali Sina University KW - Thermal Imagery KW - Landsat 8 KW - Crop growth stages KW - Emissivity KW - SAVI UR - http://jgit.kntu.ac.ir/article-1-294-en.html DO - 10.29252/jgit.3.3.95 ER -