on_land checks

[ymgan]

obis-qc checks

Check	Fields	Flags	corresponding BDQ TG2 test	Absence	Dropped	Vandepitte et al. flag number
Is the occurrence located on land? Based on OpenStreetMap land polygons.	decimalLongitude, decimalLatitude	ON_LAND	VALIDATION_COORDINATES_TERRESTRIALMARINE			6

TDWG BDQ TG2 Tests

https://github.com/tdwg/bdq/projects/2#column-3287342

Validation

validation	description	fields	notes
VALIDATION_COORDINATES_TERRESTRIALMARINE	Does the marine/non-marine biome of a taxon from the bdq:sourceAuthority match the biome at the location given by the coordinates?	dwc:decimalLatitude, dwc:decimalLongitude, dwc:scientificName	dwc:coordinatePrecicision and dwc:coordinateUncertaintyInMeters (if present) imply a potential displacement of the provided coordinates. These two terms can be considered spatial buffers. Likewise, country polygons cannot be 100% accurate at all scales (Dooley 2005), so a spatial buffer of the country boundaries is justified. Taking the spatial buffers into account does however greatly complicate both the logic and the implementation of such tests. The same applies to potential conversion of the Spatial Reference System (SRS) of dwc:decimalLatitude and dwc:decimalLongitude to the SRS used in the bdq:sourceAuthority.

Amendment

None

Parameters

test	default_parameters	current_obis-qc_parameters
VALIDATION_COORDINATES_TERRESTRIALMARINE	bdq:sourceAuthority[taxonismarine] default = "WORMS" [https://www.marinespecies.org/aphia.php?p=webservice]	Taxa that are not matched to WoRMS orNOT_MARINE are dropped, which means all taxa in OBIS are matched to WoRMS and are marine species.
VALIDATION_COORDINATES_TERRESTRIALMARINE	bdq:sourceAuthority[geospatialland] default = the union of "NaturalEarth 10m-physical-vectors for Land" [https://www.naturalearthdata.com/http//www.naturalearthdata.com/download/10m/physical/ne_10m_land.zip] and "NaturalEarth Minor Islands" [https://www.naturalearthdata.com/http//www.naturalearthdata.com/download/10m/physical/ne_10m_minor_islands.zip]	OpenStreetMap land polygons.
VALIDATION_COORDINATES_TERRESTRIALMARINE	bdq:spatialBufferInMeters default = "3000"

GBIF flags

https://github.com/gbif/gbif-api/blob/dev/src/main/java/org/gbif/api/vocabulary/OccurrenceIssue.java

None

Related

• Consider changing the flag for ON_LAND so that it’s not marking species that _should_ be on land according to WoRMS. quality-taskteam#30
• How to deal with required fields missing for OBIS network datasets (no nodes yet) quality-taskteam#21
• records in water flagged on_land obis-issues#199

Remarks

Consider changing the flag for ON_LAND so that it’s not marking species that should be on land according to WoRMS. (iobis/quality-taskteam#30)

[ymgan]

@pieterprovoost I forgot to talk about the buffer in the meeting just now. The default value for spatial buffer is 3000 meters for the union of "NaturalEarth 10m-physical-vectors for Land" (https://www.naturalearthdata.com/http//www.naturalearthdata.com/download/10m/physical/ne_10m_land.zip) and "NaturalEarth Minor Islands" (https://www.naturalearthdata.com/http//www.naturalearthdata.com/download/10m/physical/ne_10m_minor_islands.zip)