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Export formats

GRDC Export format (ASCII text):

column-based, comma-separated text format especially developed to share GRDC discharge data, and associated metadata. It provides a series of time-value-pairs. The header of the file provides observation metadata like station name and number, water body, coordinates, upstream catchment size, etc. as well as time series metadata and provenance information. Please note: GRDC calculated monthly values are the mean of original daily discharge values in the given calendar month. Minimum number of values in aggregation interval: 20.

GRDC Statistics format (CSV text):

column-based, comma-separated text format especially developed to share GRDC primary statistics data, and associated metadata. Statistical values of the same type like yearly values, long-term values or seasonal values are compiled in one file. The header of file provides observation metadata like station, water body, coordinates, upstream catchment size, etc. as well as processing information.

NetCDF (binary format):

exchange format of array-oriented scientific data in binary format, including file and variable metadata in key-value format. More information is provided at https://www.unidata.ucar.edu/software/netcdf/docs/. Please note: Time is provided in days since 1700-01-01.

WaterML2 format (XML):

standard exchange format for hydrological time series. Time series are provided as time-value-pairs, along with observation and time series metadata. A brief summary of WaterML2 is given at: http://waterml2.org/ . Please note: WaterML2 format is primarily developed for automatic processing, for example with Python, and not for viewing. However, you can open a wml2 file in your browser or use an XML-editor to examine your wml2 data.

ZRXP Exchange format (ASCII text):

column-based text format used particularly for data exchange between WISKI systems. It provides a series of time-value-pairs and encrypted data quality information. The corresponding column definition and time series information is in the file header.

Catchment polygons are provided as GeoJSON files, an open standard format to share geographic features. GeoJSON is supported by various mapping and GIS software products as well as open source mapping tools. Please note: catchment polygons do not exist for all GRDC stations particularly for those which came to the GRDC dataset after 2011, when the majority of polygons were delineated.

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