MODIS/Terra Land Surface Temperature/3-Band Emissivity 5-Min L2 1km NRT

The MODIS/Terra Land Surface Temperature/3-Band Emissivity (LST&E) 5-Min L2 1km data product, short-name MOD21 is produced daily in five minute temporal increments of satellite acquisition. The swath is approximately 2,030 pixels along track and 1,354 pixels per line, at a nadir resolution of 1,000 meters. The MOD21 Land Surface Temperature (LST) algorithm differs from the MOD11 (https://doi.org/10.5067/modis/mod11_l2.061) algorithm in that the MOD21 LST algorithm is based on the ASTER Temperature/Emissivity Separation (TES) technique, whereas the MOD11 uses the split-window technique. Additional details regarding the method used to create this Level 2 (L2) product are available in the Algorithm Theoretical Basis Document (ATBD (https://lpdaac.usgs.gov/documents/107/MOD21_ATBD.pdf)).

The Version 6.1 Level-1B (L1B) products have been improved by undergoing various calibration changes that include: changes to the response-versus-scan angle (RVS) approach that affects reflectance bands for Aqua and Terra MODIS, corrections to adjust for the optical crosstalk in Terra MODIS infrared (IR) bands, and more.

MODIS/Terra 陆地表面温度/3波段发射率（LST&E）5分钟L2 1公里数据产品，简称MOD21，每日以五分钟为时间间隔进行卫星采集。该数据条带沿轨迹约长2,030像素，每行约1,354像素，正下方的分辨率为1,000米。MOD21陆地表面温度（LST）算法与MOD11（https://doi.org/10.5067/modis/mod11_l2.061）算法不同，MOD21 LST算法基于ASTER温度/发射率分离（TES）技术，而MOD11则采用分裂窗口技术。有关创建此二级（L2）产品所使用方法的详细信息，可在算法理论基础文档（ATBD（https://lpdaac.usgs.gov/documents/107/MOD21_ATBD.pdf））中找到。版本6.1的一级B（L1B）产品经过各种校准变化而得到改进，包括：调整响应-相对于扫描角度（RVS）方法，影响Aqua和Terra MODIS的反射率波段，校正Terra MODIS红外（IR）波段中的光学串扰，以及其他更多改进。