ALOS PALSAR Radiometric Terrain Correction (RTC)

The creation of radiometric terrain corrected (RTC) products was a project of the Alaska Satellite Facility to make SAR data accessible to a broader community of users. RTC removes the geometric and radiometric distortions inherent in synthetic aperture radar (SAR) and the corrected PALSAR data are provided in a GIS-compatible GeoTIFF format. The release of ALOS PALSAR RTC products commenced in October 2014 and was completed a year later. Data used in the RTC project were Fine Beam (FBS, FBD) and Polarimetric (PLR) scenes over all global land areas except Antarctica, Greenland, Iceland, and northern Eurasia.Included in the package:Incidence Angle GeoTIFF, indicating the angle in radians for each pixelLayover/Shadow GeoTIFF, indicating where processing was impacted by layover or shadowBrowse image in GeoJPEG format 1000 x 1000 pixelsKMZ file with 30-m overlayMetadata in ISO 19115 format (xml file)Modified SRTM or NED DEM used for RTC processing in GeoTIFF format

辐射测地地形校正（RTC）产品的构建，是阿拉斯加卫星设施的一个项目，旨在使合成孔径雷达（SAR）数据能够被更广泛的用户群体所获取。RTC技术消除了合成孔径雷达及校正后的PALSAR数据中固有的几何和辐射畸变，并提供兼容地理信息系统（GIS）的GeoTIFF格式。ALOS PALSAR RTC产品的发布始于2014年10月，并于次年完成。RTC项目中使用的数据包括覆盖全球陆地除南极洲、格陵兰、冰岛和北欧亚大陆以外的精细波束（FBS，FBD）和极化（PLR）场景。数据包包含以下内容：入射角GeoTIFF，指示每个像素的弧度角度；叠加/阴影GeoTIFF，指示处理受到叠加或阴影影响的区域；1000 x 1000像素的GeoJPEG格式浏览图像；30米覆盖层的KMZ文件；ISO 19115格式的元数据（xml文件）；用于RTC处理的修改版SRTM或NED DEM，以GeoTIFF格式提供。