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Web-Enabled Landsat Data (WELD): A Consistent, Long-Term, Large-Area, 30m Data Record For The Terrestrial User Community

机译:支持网络的Landsat数据(焊接):用于地面用户社区的一致,长期,大面积30M的30M数据记录

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Since January 2008, the U.S. Geological Survey has been providing free terrain-corrected and radiometrically calibrated Landsat data via the Internet. This revolutionary data policy provides the opportunity to use all the data in the U.S. Landsat archive and to consider the systematic utility of Landsat data for long-term large-area monitoring. The NASA funded Web-enabled Landsat Data (WELD) project is systematically generating 30m weekly, monthly, seasonal, and annual composited Landsat Enhanced Thematic Mapper Plus (ETM+) mosaics of the conterminous United States and Alaska from 2005 to 2012. The WELD products are developed specifically to provide consistent data that can be used to derive land cover as well as geophysical and biophysical products for regional assessment of surface dynamics and to study Earth system functioning. The products are processed so that users do not need to apply the equations and spectral calibration coefficients and solar information to convert the ETM+ digital numbers to reflectance and brightness temperature, and successive products align precisely, making them simple to use for multi-temporal applications. The consistency and quality of the ETM+ data will be improved through a fusion with standard MODIS land products, including the MODIS BRDF reflectance anisotropy product to radiometrically normalize and fill missing (cloudy and SLC-off) Landsat pixels and using MODIS atmospheric characterization data to systematically atmospherically correct the Landsat data. Information on the WELD products, how to access them via the Internet, and preliminary examples of prototype global WELD 30m products are presented.
机译:自2008年1月以来,美国地质调查一直通过互联网提供免费的地形纠正和辐射校准的Landsat数据。这种革命性的数据策略提供了在美国Landsat存档中使用所有数据的机会,并考虑Landsat数据的系统效用,用于长期大面积监控。 NASA资助的网络支持网络的LANDSAT数据(WELD)项目系统地系统地生成30米,每月,季节性和年度复制的LANDSAT增强专题MAPPER PLUS(ETM +)MORAIC 2005年至2012年。焊接产品是专门开发,提供一致的数据,可以用于导出陆地覆盖以及地球物理和生物物理产品,用于区域动力学的区域评估和研究地球系统功能。处理产品,以便用户不需要应用方程和光谱校准系数和太阳能信息,以将ETM +数字数字转换为反射率和亮度温度,并且连续产品精确对齐,使得它们用于多时间应用程序简单。 ETM +数据的一致性和质量将通过具有标准MODIS LAND产品的融合来改进,包括MODIS BRDF反射率各向异性产品,以辐射归一化和填充丢失(阴天和SLC-OFF)LANDSAT像素,并使用MODIS大气表征数据系统地进行系统大气纠正Landsat数据。有关焊接产品的信息,如何通过互联网访问它们,并提出了原型全球焊接30M产品的初步示例。

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