L8 SPARCS Cloud Validation Masks

This dataset was originally created by M. Joseph Hughes, Oregon State University, and was derived manually from Landsat Operational Land Imager (OLI) scenes. Its purpose was to validate cloud and cloud shadow masking derived from the Spatial Procedures for Automated Removal of Cloud and Shadow (SPARCS) algorithm. Each product is provided as a thematic raster, and includes the classes of �cloud�, �cloud shadow�, �snow/ice�, �water�, and �flooded�. While these validation images were subjectively digitized by a single analyst, they provide useful information for quantifying the accuracy of clouds flagged by various cloud masking algorithms. Each mask is a 1000 pixel by 1000 pixel subset of an original Landsat Level-1 scene. The mask and accompanying color composite preview image are provided in PNG image format, and includes all bands from the original Landsat Level-1 data (GeoTIFF band-interleaved by pixel (BIP)), Landsat Level-1 quality band (GeoTIFF), and its associated Level-1 metadata (MTL.txt file).本数据集最初由俄勒冈州立大学的M. Joseph Hughes构建，其原始数据手动提取自陆地卫星业务陆地成像仪（Landsat Operational Land Imager, OLI）影像场景。本数据集旨在验证由云与阴影自动去除空间程序（Spatial Procedures for Automated Removal of Cloud and Shadow, SPARCS）算法生成的云与云阴影掩膜效果。每个产品以专题栅格形式提供，包含“云”、“云阴影”、“雪/冰”、“水体”与“淹没区”共5类地物。尽管这批验证影像由单一名分析师主观数字化完成，但仍可为量化各类云掩膜算法标记云团的精度提供有效参考。每个掩膜均为原始陆地卫星Level-1影像场景的1000×1000像素子集。该数据集的掩膜文件与配套彩色合成预览影像均采用PNG格式存储，同时包含原始陆地卫星Level-1数据的全波段信息（像素交叉带（Band-Interleaved by Pixel, BIP）格式的GeoTIFF文件）、陆地卫星Level-1质量波段GeoTIFF文件，以及与之关联的Level-1元数据（MTL.txt文件）。