geospatial_bounds global attribute

[atmodatcode]

Dear Ag,
I'm a colleague of Carsten E. at DKRZ. I was doing some research on what is the common practice to use the ACDD global attribute geospatial_bounds. By doing so, I found that the way the NCAS-AMF-2.0 Conventions is doing it (e.g. description in global-attributes.tsv and implementation in ncas-caps-1_ral-air_29001225_particle-size-distribution_cas_v0.1.nc geospatial_bounds = "51.5733N -1.3147E, 52.5733N -0.3147E") differs from what seems to be the "common practice" and how it is described in ACDD. Common practice is something like
:geospatial_bounds = "POINT (-123.45 38.048)" ;
:geospatial_bounds = "POLYGON ((-77.5 -180.0, 77.5 -180.0, 77.5 180.0, -77.5 180.0, -77.5 -180.0))" ;
This is also consistent with OGC's WKT Geometry format.
Just in case this is of interest for you, I'm sending you my review of common practice.
Best regards Angelika
Common_practice_geospatial_global_attributes.pdf
--> since I did this with Redmine Textile, the hyperlinks don't show up in the pdf, I'm also attaching the Textile text below.

h2. Common practice geospatial_bounds geospatial_bounds_crs

| geospatial_bounds_crs | geospatial_bounds | other geospatial | source |
|EPSG:3412|POLYGON(POLYGON ((-3950000 4350000, 3950000 4350000, 3950000 -3950000, -3950000 -3950000, -3950000 4350000)|geospatial_lat/lon_min/max/units+ geospatial_x_y_units/resolution|NSIDC0001_TB_PS_S25km_20220105_v6.0.nc,HTTPS(via 'https://nsidc.org/data/nsidc-0001)|
|EPSG:4326|POINT(POINT (-123.458000 38.048000)|geospatial_lat/lon_min/max/units|NCEI template NCEI_timeSeries_template_v2.0_2016-09-22_181830.715665.nc,HTTPS('https://www.ncei.noaa.gov/thredds-ocean/catalog/example/v2.0/catalog.html?dataset=example/v2.0/NCEI_timeSeries_template_v2.0_2016-09-22_181830.715665.nc')|
|None|51.5733N -1.3147E, 52.5733N -0.3147E|None|NCAS-AMF-2.0,ncas-caps-1_ral-air_29001225_particle-size-distribution_cas_v0.1.nc,HTTPS('https://sites.google.com/ncas.ac.uk/ncasobservations/v2-0-air?authuser=0')|
|EPSG:4326|POINT(POINT(-119.685 34.408)|geospatial_lat/lon_min/max/resolution/units|stearns_wharf-2013.nc,HTTPS('https://data.nodc.noaa.gov/thredds/catalog/ioos/sccoos/stearns_wharf/catalog.html?dataset=ioos/sccoos/stearns_wharf/stearns_wharf-2013.nc')|
|EPSG:4326|POINT(Point (-12.3603786251 35.8163543917)|none|5WFJ_SWE.nc, HTTPS(sulzfluh.slf.ch/5WFJ_SWE.nc.html)|
|EPSG:4326|POINT(POINT (235.355 46.133)| geospatial_lat/lon_min/max |CDIP_46248_4b73_7827_465e.nc,HTTPS('https://chapman.ceoas.oregonstate.edu/erddap/info/CDIP_46248/index.html)|
|EPSG:3413|None|geospatial_lat/lon_min/max, additionally: spatial_resolution and grid|SMOS_Icethickness_v3.3_north_20220331.nc,HTTPS('https://icdc.cen.uni-hamburg.de/thredds/fileServer/ftpthredds/smos_sea_ice_thickness/v3.3/nh/2022/03/SMOS_Icethickness_v3.3_north_20220331.nc,'https://earth.esa.int/eogateway/documents/20142/37627/SMOS-L3-Sea-Ice-Thickness-Product-document.pdf) |
|EPSG:4326|POINT(POINT (-20.296944 57.496944)|geospatial_lat/lon_min/max|ncecat_Vacoas_2019-10-29_to_2021-12-31.nc,HTTPS('http://doi.org/10.5281/zenodo.4408662)|
|http://www.opengis.net/def/crs/EPSG/0/4326|POLYGON(POLYGON (78.92,11.93,79,12)|geospatial_lat/lon_min/max/resolution/units|SCD2.10-NyAl-CNR-2020.nc, HTTPS('https://doi.org/10.5281/zenodo.5705594)|
|EPSG:4326|POLYGON(POLYGON((-124.7666666333333 49.400000000000000, -124.7666666333333 25.066666666666666, -67.058333300000015 25.066666666666666, -67.058333300000015 49.400000000000000, -124.7666666333333 49.400000000000000)|geospatial_lat/lon_min/max/resolution/units|pr_2018.nc,HTTPS('http://www.northwestknowledge.net/metdata/data/pr_2018.nc)|
|EPSG:4326|POLYGON(POLYGON ((10.7413 116.104, 26.9439 116.104, 26.9439 148.896, 10.7413 148.896, 10.7413 116.104)|geospatial_lat/lon_min/max/resolution/units|roms_mari_ROMS_CNMI_Regional_Ocean_Model_best.nc,HTTPS((pae-paha.pacioos.hawaii.edu/thredds/ncss/roms_mari/ROMS_CNMI_Regional_Ocean_Model_best.ncd?var=temp&north=26.9438&west=116.1044&east=148.8959&south=10.7412&disableLLSubset=on&disableProjSubset=on&horizStride=1&time_start=2015-04-15T00%3A00%3A00Z&time_end=2022-04-09T00%3A00%3A00Z&timeStride=1&vertCoord=&addLatLon=true)|
|EPSG:4326|POLYGON(POLYGON((-90.0 180.0, 90.0 180.0, 90.0 -180.0, -90.0 -180.0, -90.0 180.0)|geospatial_lat/lon_min/max/resolution/units|ct5km_sst_ssta_monthly_v31_202202.nc HTTPS(coastwatch.pfeg.noaa.gov/erddap/files/NOAA_DHW_monthly/ct5km_sst_ssta_monthly_v31_202202.nc)|
|EPSG:4326|None|geospatial_lat/lon_min/max/resolution/units|PH53_2021001_2021031_sstd.nc,HTPPS(coastwatch.pfeg.noaa.gov/erddap/files/erdPH53sstdmday/2021/PH53_2021001_2021031_sstd.nc)|
|None|None|geospatial_lat/lon_min/max/units|OS_PAP-3_201205_P_deepTS.nc,HTTPS('http://www.oceansites.org/docs/OS_PAP-3_201205_P_deepTS.nc, 'http://www.oceansites.org/docs/oceansites_data_format_reference_manual.pdf)|
|EPSG:4326|POLYGON(POLYGON ((-117.3115 32.904, -117.312625 32.90455, -117.316 32.9062, -117.3115 32.904)|geospatial_lat/lon_min/max/resolution/units|sp013_20210419t1718_ee6b_39c2_6fa3.nc,HTPPS(erddap.axiomdatascience.com/erddap/tabledap/sp013_20210419t1718.nc?trajectory%2Cwmo_id%2Ctime%2Clatitude%2Clongitude%2Cprofile_id%2Ctime_uv%2Clat_uv%2Clon_uv%2Cu%2Cv%2Clatitude_qc%2Clongitude_qc%2Ctime_qc%2Cdepth%2Cdepth_qc%2Cpressure%2Cpressure_qc%2Cconductivity%2Cconductivity_qc%2Cdensity%2Cdensity_qc%2Cprecise_lat%2Cprecise_lon%2Cprecise_time%2Cprecise_lat_qc%2Cprecise_lon_qc%2Cprecise_time_qc%2Csalinity%2Csalinity_qc%2Ctemperature%2Ctemperature_qc%2Ctime_uv_qc%2Clat_uv_qc%2Clon_uv_qc%2Cu_qc%2Cv_qc%2Cplatform_meta%2Cinstrument_ctd&trajectory=%22sp013-20210419T1718%22)|

[agstephens]

@atmodatcode : Thanks for letting us know about this. :-)