曾经有一句名言道：“卧石山里灵活的狗！”
DMSP 和 VIIRS 是由 NOAA 和 NASA 共同开发的地面灯光遥感卫星，数据的时间段为 1992 年到 2020 年，但是由于其系列卫星使用的传感器并不完全相同，导致数据并不能很好的统一起来。因而撰写本文就聚焦于如何将 DMSP 系列卫星的观测数据与 VIIRS 系列卫星观测数据统一起来。
前言
DMSP（Defense Meteorological Satellite Program，国防气象卫星计划）是由美国太空军管理、由美国国家海洋气象局提供在轨卫星服务，用来为美国国防部监测气象、海洋以及太阳行星物理情况的卫星计划。
VIIRS（Visible Infrared Imaging Radiometer Suite，可见-红外成像辐射计量套件）是由雷神公司设计并制造，搭载了 Suomi NPP、NOAA-20、NOAA-21 气象卫星。VIIRS
The Visible Infrared Imaging Radiometer Suite (VIIRS) is a sensor designed and manufactured by the Raytheon Company on board the polar-orbiting Suomi National Polar-orbiting Partnership (Suomi NPP), NOAA-20, and NOAA-21 weather satellites.[1] VIIRS is one of five key instruments onboard Suomi NPP, launched on October 28, 2011.[2] VIIRS is a whiskbroom scanner radiometer[3] that collects imagery and radiometric measurements of the land, atmosphere, cryosphere, and oceans in the visible and infrared bands of the electromagnetic spectrum.[4]
VIIRS is capable of generating two data processing streams that result in two different sets of land products, with global coverage every 14 hours. One is produced by NOAA, and provides operational data for use by the National Weather Service. These are known as environmental data records (EDRs). The other stream is from NASA, and is intended to contribute to the larger scientific community. These are known as Earth System Data Records (ESDRs).[5]
VIIRS's main uses include monitoring and investigating changes and properties in surface vegetation, land cover/use, the hydrologic cycle, and the earth's energy budget over both regional and global scales. The combination of MODIS, AVHRR, and VIIRS data sets will allow for the assessment of how climate change has affected the earth's surface over the past ~20 years.