Darwin Core Archive Publication Model for OW1 Catch Data

Darwin Core Archive structure defining how Rutgers OW1 Bottom Trawl Survey catch data should be published as a DwC-A. This schema defines Event core, Occurrence extension, and ExtendedMeasurementOrFact (eMoF) extension classes with mappings back to source OW1 fields. Uses SKOS mapping predicates in reverse (DwC terms map to OW1 fields) to document both the semantic relationships and the publishing structure.

Schema file: models/datasets/rutgers/ow1-to-dwc-mappings.yaml

Mapping Overview

flowchart LR
    A[Source Fields] -->|exact_mappings| B[Target Terms]
    A -->|related_mappings| C[Custom Transform]
    C --> B

    style A fill:#e1f5ff
    style B fill:#d4edda
    style C fill:#fff4e1

Mapping types:

exact_mappings: 1:1 field renames (auto-transformed)
related_mappings: Complex transformations requiring custom logic
close_mappings: Conceptually similar fields

DarwinCoreArchive Mappings

Container representing a complete Darwin Core Archive for OW1 catch data.

Event Mappings

Event core records representing sampling events in the OW1 survey. Hierarchical structure: cruise (parent) → tow (child).

Auto-Mapped Fields (1:1)

Target Term	Source Field	Transformation
parentEventID	`tow_cruise`	Direct copy
eventDate	`tow_time`	Direct copy
locationID	`station`	Direct copy

Custom-Mapped Fields

Target Term	Source Fields	Transformation
eventID	`tow_cruise`, `tow_station`	Combine TowRecord.tow_cruise + TowRecord.tow_station to create unique eventID
decimalLatitude	`start_latitude`, `end_latitude`	Calculate midpoint from TowRecord.start_latitude and TowRecord.end_latitude
decimalLongitude	`start_longitude`, `end_longitude`	Calculate midpoint from TowRecord.start_longitude and TowRecord.end_longitude
samplingProtocol	`length_type`	Document from dataset metadata: bottom trawl, 3 knots, 20 minutes

Occurrence Mappings

Occurrence extension records representing species observations within sampling events. Each occurrence represents a single species (or species+size_class) caught during a tow.

Auto-Mapped Fields (1:1)

Target Term	Source Field	Transformation
vernacularName	`species_common_name`	Direct copy
scientificName	`species_scientific_name_lookup`	Direct copy

Custom-Mapped Fields

Target Term	Source Fields	Transformation
occurrenceID	`index`	Can use OW1 index as base for occurrenceID
eventID	`tow_cruise`, `tow_station`	Combine TowRecord.tow_cruise + TowRecord.tow_station to create unique eventID
occurrenceRemarks	`size_class`	Include size_class information if present

ExtendedMeasurementOrFact Mappings

ExtendedMeasurementOrFact (eMoF) extension records for measurements and observations. Used for length measurements, weights, counts, and size class designations.

Custom-Mapped Fields

Target Term	Source Fields	Transformation
occurrenceID	`index`	Can use OW1 index as base for occurrenceID
eventID	`tow_cruise`, `tow_station`	Combine TowRecord.tow_cruise + TowRecord.tow_station to create unique eventID
measurementType	`length_type`	Examples: 'mean length', 'length standard deviation', 'total weight', 'total count'
measurementValue	`mean_length`, `std_length`, `total_weight`, `total_count`	Direct value from source measurement field
measurementRemarks	`length_type`	Document length measurement type (FL, TL, DW, CW, ML, SW, SH)