Métadonnées offertes par l’API STAC de GEODES

STAC Item metadata

Cette page décrit l’ensemble des métadonnées offertes par l’API STAC de GEODES. Toutes les données référencées dans GEODES sont décrites selon un modèle de métadonnées uniformisé. Cependant, en fonction de la collection de la donnée, seules certaines métadonnées sont pertinentes. Avec la liste déroulante ci-dessous, sélectionner une collection pour visualiser les métadonnées remplies pour cette collection et des examples pour chacune d’entre elles.

Tableau récapitulatif

Nom Recherchable Description
a21_code
a23_code
acquisition_station true Acquisition Station, Introduced for SWH
bands true STAC bands: An array of available bands where each object is a Band Object. (https://github.com/radiantearth/stac-spec/blob/master/commons/common-metadata.md#bands) CAREFULL, In GEODES it is a string
classification true
cloud_cover_quotes Introduced with SWH
continent_code true continental ID List; Values should be ‘AF’, ‘NA’, ‘OC’, ‘AN’, ‘AS’, ‘EU’, ‘SA’, ‘SS’; Use for Sentinel to set if data is oceanic or not. Field theme can be used for that
coupled_mode
coupling_modes
dataset true DataSet Name
datetime true Matching providerDisseminationDate; Date when provider Send dissemination Message; If Set, the information will be in providerDisseminationDate in DATAMODEL GEODES (properties.date in datamodel GEODES is the date of publication in GEODES ).
end_datetime true The last or end date and time for the resource, in UTC. It is formatted as date-time according to RFC 3339, section 5.6. (https://github.com/radiantearth/stac-spec/blob/master/commons/common-metadata.md#date-and-time-range)
endpoint_url
eo:cloud_cover true type DOUBLE; Estimate of cloud cover as a percentage (0-100). (https://github.com/stac-extensions/eo?tab=readme-ov-file#fields)
eo:snow_cover type DOUBLE; Estimate of snow and ice cover as a percentage (0-100). (https://github.com/stac-extensions/eo?tab=readme-ov-file#fields)
gain_number true GEODES – SWH ONLY: Higher gain levels for dim images significantly reduce exposure time. For each doubling of gain number, exposure time is halved.
gerald_name true SWH custom field: In Spot World Heritage (SWH) products, the geraldName field typically refers to a standardized or formal name given to the product or scene.
grid:code true Tile of the product. If the data is tiled according to an S2 grid, it is recommended to put the T to be uniform with the other collections
grid_reference The gridReference is used in Spot World Heritage products to refer to specific geographic areas.
hydrology
identifier Provider identifier. The ID should be unique within the Collection that contains the Item. (https://github.com/radiantearth/stac-spec/blob/master/item-spec/item-spec.md)
image_quality Introduced for SWH
instrument true Satellite Sensor
keywords true STRING_ARRAY; Keywords of product; Optionnal; Overload by GEODES ITAG component ( season:winter … location:coastal …)
latest
mission Project Name; This field Help User to find products more easily
mission_take_id
nb_bands true Number of spectral Bands.
nb_col_interpolation_error true Nb col interpolation error
nb_cols true total number of cols, in string (introduced for Flatsim)
nb_rows true total number of raws, in string (introduced for Flatsim)
no_geometry
parameter true POSTEL Collection Parameter
physical
platform true Satellite Platform; recommanded for Portal
pparameter true POSTEL Collection PParameter
processing:datetime true Processing date and time of the corresponding data formatted according to RFC 3339, section 5.6, in UTC. (https://github.com/stac-extensions/processing?tab=readme-ov-file#fields)
processing:level true Product Level (Recommanded for geoserver usage)
processing:lineage true Processing Mode; Introduced with FLATSIM products
processing:version true The version of the primary processing software or processing chain that produced the data. For example, this could be the processing baseline for the Sentinel missions. (https://github.com/stac-extensions/processing)
processing_context true Processing Context used to generate product
processing_correction true Processing Correction
product true
product:timeliness true It is close of timeliness_category
product:type true The product type
product_validity true Refers to the period or conditions under which the image product is considered valid or usable. It can indicate whether the product has passed quality checks or meets specific predefined criteria.
proj:bbox
provider_urn true Provider REGARDS urn: uniform resource name as unique identifier (https://regardsoss.github.io/docs/); If Set in Input message, urn will be set in providerUrn field in GEODES DATATAMODEL, and another urn will be set in GEODES Data. This field is mandatory to recieve an acquittement DisseminationAckSender between 2 REGARDS
raster:spatial_resolution true Spatial resolution in meters
references
s2:datatake_id true Datatake Identifier (https://github.com/stac-extensions/sentinel-2)
sar:beam_ids true Subswath
sar:instrument_mode true Sensor Mode
sar:polarizations true Any combination of polarizations. Specifies a single polarization or a polarization combination. For single polarized radars one of HH, VV, HV or VH must be set. Fully polarimetric radars add all four polarizations to the array. Dual polarized radars and alternating polarization add the corresponding polarizations to the array, for instance for HH+HV add both HH and HV. (https://github.com/stac-extensions/sar?tab=readme-ov-file#item-properties-or-asset-fields) Important: In the properties of a STAC Item sar:polarizations must be a set with unique elements. In assets sar:polarizations can contain duplicate elements and, if possible, the polarizations must appear in the same order as in the file. CAREFULL. In Geodes it is polarization without s and it is a string, not a string List
sat:absolute_orbit true The absolute orbit number at the time of acquisition. (https://github.com/stac-extensions/sat?tab=readme-ov-file#item-properties)
sat:orbit_cycle true The number of repeat cycle done by the satellite at the time of the acquisition. Repeat cycle is the time between two successive identical orbits.(https://github.com/stac-extensions/sat?tab=readme-ov-file#item-properties)
sat:orbit_state true The state of the orbit. Either ascending or descending for polar orbiting satellites, or geostationary for geosynchronous satellites (https://github.com/stac-extensions/sat?tab=readme-ov-file#item-properties)
sat:relative_orbit true The relative orbit number at the time of acquisition. (https://github.com/stac-extensions/sat?tab=readme-ov-file#item-properties)
scene_count The scenecount in Spot World Heritage products refers to the total number of individual image scenes in a given product. It indicates how many distinct acquisitions are included, providing an idea of the product’s size, geographic coverage, and temporal diversity.
scene_id true Identifier of the scene. For Spot World Heritage (SWH) products, the refers to sceneIdDALI
scene_rank Introduced with SWH
sci:doi true
sensor_angle true Camera viewing angle – SWH
shift_value Introduced with SWH
start_datetime true
statistics
subtile true Processing Site. Introduced in FLATSIM to describe a sub-collection
swath true String of the list of Swath
swath_mode SWH custom field: refers to the specific mode of image acquisition used by the SPOT satellite when capturing the image. A swath is the strip of the Earth’s surface that is imaged during a satellite pass.
temporal_resolution true THIS FIELD should be in DataSet and not in DATAMODEL; DO NOT FIELD IT
version Version of the context this fields is used in (e.g. Asset or Collection). (https://github.com/stac-extensions/version)
view:incidence_angle true The incidence angle is the angle between the vertical (normal) to the intercepting surface and the line of sight back to the satellite at the scene center. Measured in degrees (0-90). (https://github.com/stac-extensions/view)
view:sun_azimuth From the scene center point on the ground, this is the angle between truth north and the sun. Measured clockwise in degrees (0-360).(https://github.com/stac-extensions/view)
view:sun_elevation true Sun elevation angle. The angle from the tangent of the scene center point to the sun. Measured from the horizon in degrees (-90-90). Negative values indicate the sun is below the horizon, e.g. sun elevation of -10° means the data was captured during nautical twilight..(https://github.com/stac-extensions/view)

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