[[["易于理解","easyToUnderstand","thumb-up"],["解决了我的问题","solvedMyProblem","thumb-up"],["其他","otherUp","thumb-up"]],[["没有我需要的信息","missingTheInformationINeed","thumb-down"],["太复杂/步骤太多","tooComplicatedTooManySteps","thumb-down"],["内容需要更新","outOfDate","thumb-down"],["翻译问题","translationIssue","thumb-down"],["示例/代码问题","samplesCodeIssue","thumb-down"],["其他","otherDown","thumb-down"]],[],[],["This Landsat 7 dataset, available from 1999 to 2017, provides 8-day composites of the Normalized Difference Water Index (NDWI). Composites were created from Level L1T orthorectified scenes using top-of-atmosphere (TOA) reflectance, with the most recent pixel in the 8-day period used as the composite value. The NDWI, derived from Near-IR bands, indicates liquid water content. This collection is complete as of May 1, 2017, and has been superseded by a newer dataset. USGS requests appropriate citation when using the data.\n"]]