pvlib.iotools.read_crn¶

pvlib.iotools.read_crn(filename)[source]¶

Read NOAA USCRN [1] [2] fixed-width file into pandas dataframe.

Parameters:	filename (str, path object, or file-like) – filepath or url to read for the fixed-width file.
Returns:	data (Dataframe) – A dataframe with DatetimeIndex and all of the variables in the file.

Notes

CRN files contain 5 minute averages labeled by the interval ending time. Here, missing data is flagged as NaN, rather than the lowest possible integer for a field (e.g. -999 or -99). Air temperature in deg C. Wind speed in m/s at a height of 1.5 m above ground level.

Variables corresponding to standard pvlib variables are renamed, e.g. SOLAR_RADIATION becomes ghi. See the pvlib.iotools.crn.VARIABLE_MAP dict for the complete mapping.

References

[1]	U.S. Climate Reference Network https://www.ncdc.noaa.gov/crn/qcdatasets.html

[2]	Diamond, H. J. et. al., 2013: U.S. Climate Reference Network after one decade of operations: status and assessment. Bull. Amer. Meteor. Soc., 94, 489-498. DOI: 10.1175/BAMS-D-12-00170.1