8.2. Surface upwelling longwave radiation
Surface upwelling longwave radiation, which is dominated by the surface temperature (see Chapter 7), is an indicator of how warm the Earth's surface is. This section focuses on methods used to estimate the surface upwelling longwave radiation. Three methods will be presented. Section 8.2.1 describes the widely used temperature-emissivity method, and Section 8.2.2 presents the linear and ANN model methods developed using the general framework of hybrid methods (see Section 8.1.3).
8.2.1. Temperature-emissivity method
Theoretically, the surface upwelling longwave radiation consists of two components: the surface longwave emission and the reflected surface downward longwave radiation (Liang, 2004):
Get Advanced Remote Sensing, 2nd Edition now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
