GCOOS Web Accessible Folder

To facilitate data access, GCOOS maintains a Web Accessble Folder (WAF) for all of its holdings. The WAF (http://data.gcoos.org/data/waf) is structured as shown in the left.

WAF Structure SHA384
 

Each data folder contains a SHA384 hash file (SHA384SUM) that can be used for any collision-resistant application. SHA384SUM can be used to validate downloaded files, check if a file was modified, or use it as a folder manifest to check if there are new files added to the folder. The nc_by_platform folders will contain a SHA384SUM_Archive manifest to guide archival centers to what data can be archived to national archival repositories.

 

csv_by_observation
 

This folder contains two subfolders, 'atm' and 'ocn' for atmospheric and oceanographic observations, respectively. The data files are summarized by observation, and segregated by year starting in 2008. All files in these folders follows the following file naming syntax:

'gcoos_'+year+"_"+month+"_"+variable+".csv"

File are suffixed with '.csv' to indicate the data format, i.e. Comma Separate Values. The files in these folders have a corresponding ISO 19115 Parts 1 (https://geo-ide.noaa.gov/wiki/index.php?title=Category:ISO_19115) and 2 (https://geo-ide.noaa.gov/wiki/index.php?title=ISO_19115-2_(Geographic_Information_%E2%80%93_Metadata_Part_2)), a recommended presentation of ISO 19139 standard (https://geo-ide.noaa.gov/wiki/index.php?title=Category:ISO_19139). The metadata files uses the same filenaming syntax as above but suffixed with '.xml' to indicate XML data format.

 

csv_by_platform
 

This folder contain files, summarized by platform or stations. Data from regional assets are summarized and seggregated by year. Atmospheric observations are in the 'atm' folder and oceanographic observations in the 'ocn' folder.

The following are the variables classified as 'atmospheric':

1. air_pressure (mbar)
2. air_temperature (Celsius)
3. dew_point_temperature (Celsius)
4. relative_humidity (%)
5. wind_speed (m s-1)
6. wind_speed_of_gust (m s-1)
7. wind_to_direction (degrees_true)

The oceanopgraphic variables, arranged according the date, time and depth from where the observation was observed:

1. sea_water_speed (cm s-1)
2. direction_of_sea_water_velocity (degrees_true)
3. upward_sea_water_velocity (cm s-1)
4. mass_concentration_of_chlorophyll_in_sea_water (ug L-1)
5. mole_concentration_of_dissolved_molecular_oxygen_in_sea_water (ug L-1)
6. sea_surface_height_above_sea_level (m)
7. sea_water_practical_salinity (PSU),
8. sea_water_temperature (Celsius)
11. sea_water_turbidity (NTU)

All files in these folders follows the following syntax:

'gcoos_'+urn+"_"+year+"_"+month+"_"+variable+"_"+sensor number+".csv"

As with previous, file suffixed with '.csv' indicate a Comma Separate Values (CSV) data formatted file.The files in these folders also have a corresponding ISO 19115-2 metadata file. The metadata files uses the same filenaming syntax as above but suffixed with '.xml' to indicate XML data format.

 

nc_by_platform
 

This folder contains the netCDF4 (classic) equivalent of the files in 'csv_by_platform' folder. It also have the same directory structure. The netCDF4 files are in compliance to IOOS standard, based on the NCEI recommendations at https://sites.google.com/a/noaa.gov/ncei-ioos-archive/cookbook?pli=1#TOC-Providing-Data-Integrity and in compliance with the NODC Profile Orthogonal specification at http://www.nodc.noaa.gov/data/formats/netcdf/v1.1/profileOrthogonal.cdl

The Python script used to generate the netCDF files are in the GCOOS GitHub folder (https://github.com/GCOOS/csv2nc).

     
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