The ASTER Global Emissivity Dataset

由NASA多个卫星平台上的仪器获取的热红外 (TIR) 数据主要用于估算地球陆地表面的表面温度/发射率。在NASA的Terra卫星1999年上发射的一种此类仪器是先进的星载热辐射和反射辐射计 (ASTER)，其空间分辨率为90 m。使用ASTER数据，NASA/喷气推进实验室最近发布了最详细的地球发射率图，称为ASTER全球发射率数据集 (ASTER GED)，该数据集是通过处理数百万个无云的ASTER场景2000年2008年而获得的。ASTER GEDv3在〜100 m和〜1千米处提供平均发射率，而GEDv4在8至12 µ m的波长范围内提供在〜5千米空间分辨率下2015年的月发射率2000年。与具有平均绝对误差为2.4% (收集4) 和4.6% (收集5) 的当前heritage MODIS产品相比，来自四个沙漠地点的实验室光谱的验证导致平均绝对带误差为〜1%。

Thermal infrared (TIR) data acquired by instruments on multiple NASA satellite platforms are primarily used to estimate Earth’s terrestrial land surface temperature and emissivity. One such instrument, the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER), was launched in 1999 aboard NASA’s Terra satellite, with a spatial resolution of 90 m. Using ASTER data, NASA/Jet Propulsion Laboratory (JPL) recently released the most detailed global Earth emissivity map, termed the ASTER Global Emissivity Dataset (ASTER GED), which was developed by processing millions of cloud-free ASTER scenes acquired between 2000 and 2008. ASTER GEDv3 provides average emissivity at ~100 m and ~1 km spatial resolutions, while GEDv4 offers monthly emissivity from 2000 to 2015 at a spatial resolution of ~5 km within the 8–12 µm wavelength range. Compared to the current heritage MODIS products, which have mean absolute errors of 2.4% (Collection 4) and 4.6% (Collection 5), validation against laboratory spectra from four desert sites yielded a mean absolute band error of ~1%.

搜集汇总

背景与挑战

背景概述

该数据集是NASA基于ASTER卫星热红外数据制作的全球发射率数据集，提供2000年至2015年间地球陆地表面的高精度发射率信息，空间分辨率覆盖100米至5千米。其特点是精度优于传统MODIS产品，平均绝对带误差约为1%，适用于地表温度和环境监测研究。