dataretrieval.nadp

Tools for retrieving data from the National Atmospheric Deposition Program (NADP) including the National Trends Network (NTN), the Mercury Deposition Network (MDN).

National Trends Network

The NTN provides long-term records of precipitation chemistry across the United States. See https://nadp.slh.wisc.edu/ntn for more info.

Mercury Deposition Network

The MDN provides long-term records of total mercury (Hg) concentration and deposition in precipitation in the United States and Canada. For more information visit https://nadp.slh.wisc.edu/networks/mercury-deposition-network/

Notes

Gridded data on NADP is served as zipped tif files. Functions in this module will either download and extract the data, when a path is specified, or open the data as a GDAL memory-mapped file when no path is specified.

Todo

include AIRMoN, AMNet, and AMoN
flexible handling of strings for parameters and measurement types
add errorchecking
add tests

class dataretrieval.nadp.NADP_ZipFile(file, mode='r', compression=0, allowZip64=True, compresslevel=None, *, strict_timestamps=True)[source]

Extend zipfile.ZipFile for working on data from NADP

tif()[source]: Read the tif file in the zip file.

tif_name()[source]: Get the name of the tif file in the zip file.

dataretrieval.nadp.get_annual_MDN_map(measurement_type, year, path)[source]

Download a MDN map from NDAP.

This function looks for a zip file containing gridded information at: https://nadp.slh.wisc.edu/maps-data/mdn-gradient-maps/. The function will download the zip file and extract it, exposing the tif file if a path is provided.

Parameters:

measurement_type (string) – The type of measurement (concentration or deposition) as a string, either ‘conc’ or ‘dep’ respectively.
year (string) – Year as a string ‘YYYY’
path (string) – Download directory.

Returns:

path – Path that zip file was extracted into if path was specified.

Return type:

string

Examples

>>> # get map of mercury concentration in 2010 and extract it to a path
>>> data_path = dataretrieval.nadp.get_annual_MDN_map(
...     measurement_type="conc", year="2010", path="somepath"
... )

dataretrieval.nadp.get_annual_NTN_map(measurement_type, measurement=None, year=None, path='.')[source]

Download a NTN map from NDAP.

This function looks for a zip file containing gridded information at: https://nadp.slh.wisc.edu/maps-data/ntn-gradient-maps/. The function will download the zip file and extract it, exposing the tif file at the provided path.

Note

Measurement type abbreviations for concentration and deposition are all lower-case, but for precipitation data, the first letter must be capitalized!

Parameters:

measurement (string) – The measured constituent to return.
measurement_type (string) – The type of measurement, ‘conc’, ‘dep’, or ‘Precip’, which represent concentration, deposition, or precipitation respectively.
year (string) – Year as a string ‘YYYY’
path (string) – Download directory, defaults to current directory if not specified.

Returns:

path – Path that zip file was extracted into if path was specified.

Return type:

string

Examples

>>> # get a map of precipitation in 2015 and extract it to a path
>>> data_path = dataretrieval.nadp.get_annual_NTN_map(
...     measurement_type="Precip", year="2015", path="somepath"
... )

dataretrieval.nadp.get_zip(url, filename)[source]

Gets a ZipFile at url and returns it

Parameters:

url (string) – URL to zip file
filename (string) – Name of zip file

Returns:

ZipFile
.. todo:: – finish docstring