AQ Facets

The AQ uFIND is driven by extracting 'machine tags' from harvested ISO 19115 documents.

The facets are:

• Dataset
• Parameter
• Instrument
• Platform
• Domain
• Topic Category
• Temporal Resolution
• Vertical
• DataType
• Data Distributor
• Data Originator

The unique, atomic intity for uFIND is dataset.parameter combination (Airnow. Ozone).

The AQ community is developing a convention to add facets to WMSGetCapabilities documents (see example) as machine tags in the keywords for each layer.

Using the WMS -> ISO editor, we've developed a provider can submit WMS layers with or without these keywords and add them as part of the registration process.

To see a description of each facet see the facet keyword.

Time

Temporal extent of data

• WMS:time_min
• WMS:time_max

Space

Spatial extent of data

• WMS:Minx
• WMS:Maxx
• WMS:Miny
• WMS:Maxy

Originator

Organization that the data originally comes from

• Values - list of known originators or add new
• WMS:Originator

Data Distributor

• Values - list of known distributors or add new
• WMS:Distributor

Data Type

describes the structure of the data

• • Values -
    • Grid - Data or models that include
    • Image
    • Point
    • Trajectory

• • WMS:DataType

Vertical

vertical extent that the data covers

• Values -
  • Column - Satellite data measures an integral of the entire column from the satellite to the surface
  • Surface - surface measurements are on the surface
• WMS:Vertical

Time Resolution

how often data is collected

• Values -
  • Day - Data is collected or aggregated over a day or multiple day period
  • hour - Data is collected or aggregated over an hourly period
  • month - Data is collected or aggregated over a monthly period
  • year - Data is collected or aggregated over a yearly period
• WMS:time_unit

Topic Category

ISO topic classification (general subject of the data layer)

• Values - http://gcmd.nasa.gov/User/difguide/iso_topic_category.html
  • Topic categories are another general (mandatory) description of the dataset content. For AQ most datasets are tagged Climatology/Meteorology/Atmosphere
• WMS:TopicCategory

Domain

General topic classification used in DataFed (general subject of the data layer)

Values -

• Aerosol - datasets that measure, model aerosols and precursors
• Demographic - datasets about population
• Emission - emission inventory datasets
• Fire - datasets that relate to fire (fire pixels, smoke)
• GIS - GIS map layers needed for boundaries
• WMS:Domain

Platform

Type of platform measurements were taken from

• Values -
  • Satellite - Satellite datasets
  • Network - Surface Monitoring Network datasets
  • Model - Model datasets
  • Emission - Emission datasets ( SHOULD THIS BE A PLATFORM??)
  • Count - Population count
• WMS:Platform

Instrument

Instrument used to measure data layer

• Values -
• WMS:Instrument

Parameter

Currently, parameter = WMS Layer name. However, parameter will be homogenized so that like parameters from different datasets can be found using the common param names

• Values - Layer name in WMS/WCS
• WMS:Name

Dataset

Grouping of parameters that come from a given dataset

• Values - Free text
• WMS:Dataset