[[["容易理解","easyToUnderstand","thumb-up"],["確實解決了我的問題","solvedMyProblem","thumb-up"],["其他","otherUp","thumb-up"]],[["缺少我需要的資訊","missingTheInformationINeed","thumb-down"],["過於複雜/步驟過多","tooComplicatedTooManySteps","thumb-down"],["過時","outOfDate","thumb-down"],["翻譯問題","translationIssue","thumb-down"],["示例/程式碼問題","samplesCodeIssue","thumb-down"],["其他","otherDown","thumb-down"]],[],[],["The Landsat 7 Collection 1 Tier 1 annual composites, available from 1999 to 2021 via Google Earth Engine, utilize the Normalized Difference Snow Index (NDSI) to identify snow, computed with Green and Mid-IR bands. These composites, derived from orthorectified scenes, incorporate top-of-atmosphere (TOA) reflectance. Data users must cite the USGS as the data source and have free access for research, education, and non-profit applications, following the USGS Visual Identity System Guidance. The data is accessble using `ee.ImageCollection(\"LANDSAT/LE07/C01/T1_ANNUAL_NDSI\")`.\n"]]