Precipitation Intensity Estimates for a One-Year Recurrence Interval for the Continental United States

This dataset provides precipitation intensity estimates for a one-year recurrence interval for the Continental United States as cloud-optimized GeoTIFFs (COGs). The release includes COGs for 15-minute, 30-minute, and 60-minute rainfall durations, and the precipitation intensities for these durations are referred to as I15, I30, and I60, respectively. Each raster reports precipitation intensities in millimeters per hour for the associated rainfall duration. The majority of the data in each raster are reformatted from the National Oceanic and Atmospheric Administration (NOAA) Atlas 14. However, NOAA Atlas14 data was not available for Washington and Oregon at the time of processing, so data in these states were derived from NOAA Atlas 2. Please refer to the processing step metadata for the methodology used to derive precipitation intensity estimates from NOAA Atlas 2.

This release is intended to facilitate programmatic access to precipitation intensity estimates. This is supported by the COG format, which allows software tools to efficiently access the data over an internet connection. Each COG raster spans the continental United States at a nominal 790 x 925 meter resolution. The spatial reference is EPSG: 4326, which is often referred to as WGS-84. Each COG has float32 precision and the NoData value (NaN) indicates raster pixels that lack precipitation intensity data. The COG format uses deflate compression internally to reduce file size. As such, although each COG has a nominal file size of <8 MB, loading a full COG dataset into active memory will require ~82 MB.

This dataset was produced by running the `build_datasets.py` Python script included in the release. Please refer to the script for the source code and documentation.

Disclaimer:
Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

References:
Office of Water Prediction. (2004 - 2024). NOAA Atlas 14 [Data set]. National Oceanic and Atmospheric Administration. https://www.weather.gov/owp/hdsc.

Office of Water Prediction. (1973). NOAA Atlas 2 [Data set]. National Oceanic and Atmospheric Administration. https://www.weather.gov/owp/hdsc_noaa_atlas2.

本数据集以云优化地理标记图像文件（Cloud-Optimized GeoTIFF，COG）格式，提供美国本土的1年重现期降水强度估算结果。本次发布包含15分钟、30分钟及60分钟降雨历时对应的COG文件，上述历时的降水强度分别记为I15、I30及I60。各栅格文件均针对对应降雨历时，以毫米每小时为单位报告降水强度。
各栅格中的绝大多数数据均由美国国家海洋和大气管理局（National Oceanic and Atmospheric Administration，NOAA）《图集14》重新格式化而来。但在数据集制作时，华盛顿州与俄勒冈州暂无《图集14》的可用数据，因此这两州的降水强度数据由NOAA《图集2》推导得到。如需了解从NOAA《图集2》推导降水强度估算值的具体方法，请参阅处理步骤元数据。

本次发布旨在支持对降水强度估算值的程序化访问，而COG格式可支持软件工具通过互联网高效获取数据。每个COG栅格文件均覆盖美国本土，标称分辨率为790×925米。其空间参考为EPSG: 4326，通常也称为WGS-84。所有COG文件均采用float32精度格式，无数据值（NaN）代表缺少降水强度数据的栅格像素。COG格式内部使用deflate压缩算法以减小文件体积，因此尽管单个COG文件的标称大小不足8MB，但加载完整的COG数据集至运行内存约需82MB。

本数据集通过运行本次发布包中附带的`build_datasets.py` Python脚本生成，如需查看源代码与说明文档，请参阅该脚本。

免责声明：
任何商业、企业或产品名称的提及仅用于描述目的，并不代表美国政府的认可。

参考文献：
美国国家海洋和大气管理局水文预测办公室。(2004-2024). NOAA《图集14》[数据集]. 美国国家海洋和大气管理局。https://www.weather.gov/owp/hdsc.
美国国家海洋和大气管理局水文预测办公室。(1973). NOAA《图集2》[数据集]. 美国国家海洋和大气管理局。https://www.weather.gov/owp/hdsc_noaa_atlas2.