Land-surface temperature measurement from space: physical principles and inverse modeling

Based on current conditions that an IBM workstation RISC/6000 320H was purchased by the end of the last year, that spectral emissivities of land covers are still very limited in open literatures, and that there is no instrument for the principle investigator to make spectral emissivity measurements, the following task objectives were set for this year: 1) to port the atmospheric radiative transfer code ATRAD to the IBM workstation from a SUN workstation, and to improve its performance; 2) to make an in-depth investigation of the effect of temperature-dependent molecular absorption; 3) to verify reasonable requirements for the accuracy of radiative transfer models to be used for development of land-surface temperature (LST) algorithms and requirements for MODIS specifications based on analysis of the existing validated multi-channel sea-surface temperature algorithm for NOAA AVHRR data; 4) to develop an accurate radiative transfer model which will be suitable for development of LST algorithms. 2. Work Accomplished 2.1. ATRAD Has Been Ported to the IBM Workstation The atmospheric radiative transfer code ATRAD and related programs have been ported to the new purchased computer IBM RISC/6000 320H from a SUN workstation. A few small modifications have been made accordin