Preliminary Coastal Grain Size Portal (C-GRASP) dataset. Version 1, January 2022

Provisional database: The data you have secured from the U.S. Geological Survey (USGS) database identified as Preliminary Coastal Grain Size Portal (C-GRASP) dataset. Version 1, January 2022 have not received USGS approval and as such are provisional and subject to revision. The data are released on the condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from its authorized or unauthorized use.

Version 1 (January 2022) of the the Coastal Grain Size Portal (C-GRASP) database. This is a preliminary internal deliverable for the National Oceanography Partnership Program (NOPP) Task 1 / USGS Gesch team and project partners only.

The primary purpose of this Provisional data release is to provide National Oceanography Partnership Program (NOPP) project partners with programmatic access to this preliminary version of the Coastal Grain Size Portal (C-GRASP) database for internal project use. These data are preliminary or provisional and are subject to revision. They are being provided to meet the need for timely best science. The data have not received final approval by the U.S. Geological Survey (USGS) and are provided on the condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from the authorized or unauthorized use of the data.

This preliminary data release contains various files that list grain size information collated from secondary data already in the public domain, in the form of public datasets, or in published literature.

Where possible, we have indicated the source, location, and sampling methods used to obtain these data. Where not possible to establish these facts, those fields have been left empty.

More information on our methods, data sources, and data processing and analysis codes are found on our github page

The dataset consists of one zipped file, Source_Files.zip, and 4 comma separated value (csv) files

dataset_10kmcoast.csv- This is all data that is found to be within 10km of the Natural Earth coastline polyline

Data_EstimatedOnshore.csv- This is all the data from dataset_10kmcoast.csv that lies within the Natural Earth United States Polygon

Data_VerifiedOnshore.csv- This is all data that was able to be verified onshore from either sampling method, note, or location type data

Data_Post2012_VerifiedOnshore.csv- This is all the data from Data_VerifiedOnshore.csv that is after 2012

The files each have the following fields (no data is blank):

'ID': row ID integer

'Sample_ID': identifier to raw data source

'Sample_Type_Code': code of sample id

'Project': raw datasource project identifier

'dataset': raw dataset major identifier

'Date': date, where specified, and to whatever precision that is specified

'Location_Type': where specified, code indicating type of location information

'latitude': latitude in decimal degrees

'longitude': longitude in decimal degrees

'Contact': where specified, raw data originator

'num_orig_dists': number of unique grain size distributions

'Measured_Distributions': number iof measured grain size distributions

'Grainsize': grain size is sometimes reported without specification

'Mean', mean grain size in mm

'Median', median grain size in mm

'Wentworth', wentworth name (one of ['Clay', 'CoarseSand', 'CoarseSilt', 'Cobble', 'FineSand', 'FineSilt', 'Granule', 'MediumSand', 'MediumSilt', 'Pebble', 'VeryCoarseSand', 'VeryFineSand', 'VeryFineSilt'])

'Kurtosis', kurtosis value (non-dim)

'Kurtosis_Class', kurtosis category

'Skewness', skewness value (non-dim)

'Skewness_Class', skewness category

'Std', standard deviation of grain sizes     

'Sorting', sorting category

'd5', grain size distribution 5th percentile

'd10', grain size distribution 10th percentile

'd16', grain size distribution 16th percentile

'd25', grain size distribution 25th percentile

'd30', grain size distribution 30th percentile

'd50', grain size distribution 50th percentile

'd65', grain size distribution 65th percentile

'd75', grain size distribution 75th percentile

'd84',grain size distribution 84th percentile

'd90', grain size distribution 90th percentile

'd95', grain size distribution 95th percentile

'Notes': notes - these can be informative and substantial, do not disregard

Source_Files.zip contains 11 comma separated value files, namely bicms.csv  boem.csv  clark.csv  dbseabed.csv  ecstdb.csv  mass.csv  mcfall.csv  rossi.csv  sandsnap.csv  sbell.csv  ussb.csv, which contain raw datasets that have been collated and extracted from their native formats into csv format