calcofi_ctd_thin

Grid DAP Data	Sub- set	Table DAP Data	Make A Graph	W M S	Source Data Files	Title	Sum- mary	FGDC, ISO, Metadata	Back- ground Info	RSS	E mail	Institution	Dataset ID
	set	data	graph			CalCOFI CTD Profiles (thinned)		F I M	background			CalCOFI	calcofi_ctd_thin

The Dataset's Variables and Attributes

Row Type	Variable Name	Attribute Name	Data Type	Value
attribute	NC_GLOBAL	cdm_data_type	String	Point
attribute	NC_GLOBAL	comment	String	Long format: one row per cast x depth x measurement_type. measurement_value units depend on measurement_type. time/latitude/longitude are denormalized from ctd_cast via a DuckDB view over Parquet (EDDTableFromDatabase) — see https://calcofi.io/schema.
attribute	NC_GLOBAL	Conventions	String	COARDS, CF-1.10, ACDD-1.3
attribute	NC_GLOBAL	creator_email	String	calcofi at ucsd.edu
attribute	NC_GLOBAL	creator_name	String	CalCOFI
attribute	NC_GLOBAL	creator_url	String	https://calcofi.org
attribute	NC_GLOBAL	Easternmost_Easting	double	-117.2734
attribute	NC_GLOBAL	featureType	String	Point
attribute	NC_GLOBAL	geospatial_lat_max	double	37.84907
attribute	NC_GLOBAL	geospatial_lat_min	double	29.82682
attribute	NC_GLOBAL	geospatial_lat_units	String	degrees_north
attribute	NC_GLOBAL	geospatial_lon_max	double	-117.2734
attribute	NC_GLOBAL	geospatial_lon_min	double	-126.4843
attribute	NC_GLOBAL	geospatial_lon_units	String	degrees_east
attribute	NC_GLOBAL	geospatial_vertical_max	double	3630.0
attribute	NC_GLOBAL	geospatial_vertical_min	double	0.968
attribute	NC_GLOBAL	geospatial_vertical_positive	String	down
attribute	NC_GLOBAL	geospatial_vertical_units	String	m
attribute	NC_GLOBAL	infoUrl	String	https://calcofi.org
attribute	NC_GLOBAL	institution	String	CalCOFI
attribute	NC_GLOBAL	keywords	String	CalCOFI, California Current, CTD, depth, fluorescence, ocean, oxygen, profiles, salinity, temperature
attribute	NC_GLOBAL	license	String	CC-BY 4.0
attribute	NC_GLOBAL	Northernmost_Northing	double	37.84907
attribute	NC_GLOBAL	project	String	CalCOFI
attribute	NC_GLOBAL	publisher_name	String	CalCOFI
attribute	NC_GLOBAL	publisher_url	String	https://calcofi.org
attribute	NC_GLOBAL	references	String	https://calcofi.io/schema ; https://calcofi.org/data/oceanographic-data/ctd-cast-files/
attribute	NC_GLOBAL	source	String	CalCOFI CTD cast files (https://calcofi.org)
attribute	NC_GLOBAL	sourceUrl	String	(source database)
attribute	NC_GLOBAL	Southernmost_Northing	double	29.82682
attribute	NC_GLOBAL	standard_name_vocabulary	String	CF Standard Name Table v79
attribute	NC_GLOBAL	subsetVariables	String	cruise_key, measurement_type
attribute	NC_GLOBAL	summary	String	Adaptively-thinned CTD profiles (long format, one row per cast/depth/measurement_type; canonical sensors only, ~10 m depth grid with inflection points preserved), joined to cast coordinates/time. Served via DuckDB views over partitioned Parquet (EDDTableFromDatabase).
attribute	NC_GLOBAL	time_coverage_end	String	2026-04-23T22:01:12Z
attribute	NC_GLOBAL	time_coverage_start	String	1998-01-23T11:14:25Z
attribute	NC_GLOBAL	title	String	CalCOFI CTD Profiles (thinned)
attribute	NC_GLOBAL	Westernmost_Easting	double	-126.4843
variable	ctd_cast_uuid		String
attribute	ctd_cast_uuid	comment	String	FK to ctd_cast.ctd_cast_uuid
attribute	ctd_cast_uuid	ioos_category	String	Identifier
attribute	ctd_cast_uuid	long_name	String	CTD Cast UUID
variable	time		double
attribute	time	_CoordinateAxisType	String	Time
attribute	time	actual_range	double	8.85554065E8, 1.776981672E9
attribute	time	axis	String	T
attribute	time	comment	String	UTC timestamp parsed from date_time_utc string
attribute	time	ioos_category	String	Time
attribute	time	long_name	String	Time
attribute	time	standard_name	String	time
attribute	time	time_origin	String	01-JAN-1970 00:00:00
attribute	time	units	String	seconds since 1970-01-01T00:00:00Z
variable	latitude		double
attribute	latitude	_CoordinateAxisType	String	Lat
attribute	latitude	actual_range	double	29.82682, 37.84907
attribute	latitude	axis	String	Y
attribute	latitude	comment	String	GPS decimal latitude; downcast = start latitude, upcast = latitude at first bottle tripped (CalCOFI Lat_Dec)
attribute	latitude	ioos_category	String	Location
attribute	latitude	long_name	String	Latitude
attribute	latitude	standard_name	String	latitude
attribute	latitude	units	String	degrees_north
variable	longitude		double
attribute	longitude	_CoordinateAxisType	String	Lon
attribute	longitude	actual_range	double	-126.4843, -117.2734
attribute	longitude	axis	String	X
attribute	longitude	comment	String	GPS decimal longitude; downcast = start longitude, upcast = longitude at first bottle tripped (CalCOFI Lon_Dec)
attribute	longitude	ioos_category	String	Location
attribute	longitude	long_name	String	Longitude
attribute	longitude	standard_name	String	longitude
attribute	longitude	units	String	degrees_east
variable	depth		double
attribute	depth	_CoordinateAxisType	String	Height
attribute	depth	_CoordinateZisPositive	String	down
attribute	depth	actual_range	double	0.968, 3630.0
attribute	depth	axis	String	Z
attribute	depth	comment	String	depth in meters (retained depths only)
attribute	depth	ioos_category	String	Location
attribute	depth	long_name	String	Depth
attribute	depth	positive	String	down
attribute	depth	standard_name	String	depth
attribute	depth	units	String	m
variable	cruise_key		String
attribute	cruise_key	comment	String	cruise identifier; hive partition key
attribute	cruise_key	ioos_category	String	Identifier
attribute	cruise_key	long_name	String	Cruise Key
variable	site_key		String
attribute	site_key	comment	String	CalCOFI Line and Station composite key in the form "LLL.L SSS.S" (renamed from Sta_ID)
attribute	site_key	ioos_category	String	Identifier
attribute	site_key	long_name	String	Site Key
variable	line		String
attribute	line	comment	String	CalCOFI Line in LLL.L format (e.g. 80.0)
attribute	line	ioos_category	String	Location
attribute	line	long_name	String	Line
variable	sta		String
attribute	sta	comment	String	CalCOFI Station in SSS.S format (e.g. 60.0)
attribute	sta	ioos_category	String	Other
attribute	sta	long_name	String	Station
variable	measurement_type		String
attribute	measurement_type	comment	String	measurement type key; canonical types only (FK to measurement_type.measurement_type where is_canonical)
attribute	measurement_type	ioos_category	String	Other
attribute	measurement_type	long_name	String	Measurement Type
variable	measurement_value		double
attribute	measurement_value	comment	String	Units VARY by measurement_type — this long-format column holds the numeric value for whichever sensor the row's measurement_type names. Canonical examples: temperature (degC), salinity (PSS-78), oxygen_ml_l (ml/L), sigma_theta (kg/m3), oxygen_saturation (%), oxygen_umol_kg (umol/kg), chlorophyll_a (ug/L), phaeopigment (ug/L). See the measurement_type variable and https://calcofi.io/schema.
attribute	measurement_value	ioos_category	String	Other
attribute	measurement_value	long_name	String	Measurement Value
variable	measurement_qual		String
attribute	measurement_qual	comment	String	quality code (nullable)
attribute	measurement_qual	ioos_category	String	Other
attribute	measurement_qual	long_name	String	Measurement Quality
variable	cast_dir		String
attribute	cast_dir	comment	String	single retained direction per physical cast: D (downcast, preferred) or U (upcast, fallback)
attribute	cast_dir	ioos_category	String	Other
attribute	cast_dir	long_name	String	Cast Direction
variable	retained_reason		String
attribute	retained_reason	comment	String	why this depth was kept: grid (on the ~10 m grid) or inflection (RDP-retained between grid nodes)
attribute	retained_reason	ioos_category	String	Other
attribute	retained_reason	long_name	String	Retained Reason
variable	ctd_thin_uuid		String
attribute	ctd_thin_uuid	comment	String	PK: deterministic UUID v5 from (ctd_cast_uuid, depth_m, measurement_type)
attribute	ctd_thin_uuid	ioos_category	String	Identifier
attribute	ctd_thin_uuid	long_name	String	CTD Thin UUID

The information in the table above is also available in other file formats (.csv, .htmlTable, .itx, .json, .jsonlCSV1, .jsonlCSV, .jsonlKVP, .mat, .nc, .nccsv, .tsv, .xhtml) via a RESTful web service.