Estimates of rainfall at desired frequency (e.g., 1% annual chance or 100-year return period) and desired duration (e.g., 24-hour duration) are often required in the design of dams and other hydraulic structures, catastrophe risk modeling, environmental planning and management. One major source of such estimates for the USA is the NOAA National Weather Service's (NWS) division of Hydrometeorological Design Studies Center (HDSC). Raw data from NWS-HDSC is available at 1-km resolution and comes as a huge number of GIS files. This package provides functionality to easily access and analyze the 1-km GIS files provided by NWS' PF Data Server for the entire USA. This package also comes with datasets on record point rainfall measurements provided by NWS-HDSC.
NWS' website (ftp site) sometimes has connectivity issues. Website is checked for a response, and function proceeds only if it does.
Package vignette changed to a Rmarkdown document.
License changed from GPL to MIT
The three tasks mentioned in v0.1 NEWS still remain to be addressed.
extract_freq regional selection criterion does not include US territories such as Puerto Rico and Guam. Future updates would incorporate these regions.
rainfreq currently does not extract the upper and lower limits of the confidence intervals on frequency estimates. Future updates would incorporate this data.
Data for Texas and Pacific Northwest is currently not available from NWS. When such data becomes available,
rainfreq would be updated accordingly.