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Geospatial Purpose

Geospatial Purpose. Describe geospatial coverage of resources where resources are: Web-based activities, modules etc. Datasets Model output Visuals (maps, satellite imagery). Other Geospatial Characteristics. Meant to provide general coverage with some details in a broad sense

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Geospatial Purpose

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  1. Geospatial Purpose • Describe geospatial coverage of resources where resources are: • Web-based activities, modules etc. • Datasets • Model output • Visuals (maps, satellite imagery)

  2. Other Geospatial Characteristics • Meant to provide general coverage with some details in a broad sense • Does not describe coverage of individual variables of datasets or model output • Is independent of temporal characteristics Development period - Jan 2000 to June 2002 with some implementation fixes in Dec 2002

  3. Geospatial Development Team • DPC - Katy Ginger, Holly Devaul • ADL/ADEPT - Linda Hill, Anita Coleman, Tim Tierney and sometimes Greg and David V. • Colorado School of Mines - Tom Boyd • NASA - Shelley Olds • Other sources - Ontario Information and Tech. Standards - Metadata Content Spec; DC spec • Geosciences represented - geophysics, atmospheric science

  4. Geospatial in the Framework (1) • Overarching Bounding Box - a single overall, geometric footprint on the surface of a planet or moon in our solar system described with a 4 vortex box in geographic latitude and longitude • Detailed Geometries - detailed geometric footprints (polygons, lines, points) on the surface of a planet or moon in our solar system using multiple latitude and longitude tuples; Overarching Bounding Box is required

  5. Geospatial in the Framework (2) • Elevation - the vertical min & max of footprints (overarching box & detailed geos) with reference to ground or datum level • Planet or other body - the planet or body in our solar system for the geospatial footprint • Place-name tied to coordinates - the name of a location that is specified by a footprint (e.g. N=41°, S=37°, E=-102°, W=-109° is Colorado, United States

  6. Geospatial in the Framework (3) • Place-name not tied to coordinates - location name not specified by a geospatial footprint; (keyword searching only) • Event-name tied to coordinates - the name of an event that occurred in the area specified by the geospatial footprint (e.g. N=45°, S=22°, E=-62°, W=-86° is Hurricane Fran in 1996

  7. Geospatial in the Framework (4) • Event name not tied to coordinates - an event within an area that is not specified by a footprint; (keyword searching only) • Objects in space - the location of objects (e.g. nebulas) that are not within our solar system; described using the conventions of: • Right ascension (0 <= hours <= 24) • Declination (-90 <= degrees <= 90) • Epoch (50 year steps to redraw celestial grid due to equinox progress. epoch1950.0 / epoch2000.0)

  8. Geospatial in the Framework (5) • Coordinate system - • a frame of reference specifying the location of an object in ‘space’ • DLESE uses overarching bounding box so only Geographic latitude and longitude can be the coordinate system • visuals, raw and gridded data use coordinate system

  9. Geospatial in the Framework (6) • Datum - base reference in a coordinate system; the position of an initial point of origin and orientation of an ellipsoid that models the surface of the earth in the regionof interest. Datums apply to coordinate systems • Horizontal - NAD27, NAD83, ATS77 • Vertical - Sea level ,CGD28-CDN, NAVD29-USA, NAVD88, IGLD88 • Global - WGS72, WGS84 (GPS use), PZ-90 • Other and Unknown is allowed

  10. Geospatial in the Framework (7) • Projection - • systematic presentation (think 2-D maps) of objects on the Earth or the celestial sphere using coordinate lines on a flat surface • different projections represent different parts of the Earth better (polar stereographic versus satellite) • only visuals, not gridded or raw data, use projection • Other, Unknown and Does not apply are allowed

  11. Geospatial in the Framework (8) • Latitudes and Longitudes - • West longitudes: -180 to 0 • East longitudes: 0 to 180 • North latitudes: 0 to 90 • South latitudes: -90 to 0 All in decimal degrees and not degrees/minutes

  12. Temporal Purpose & Characteristics • Describe date/time characteristics of resources • Like geospatial not meant for individual variables rather a broad sense of time • Is independent of geospatial coverage • Development period - May 2002 to Dec 2002 • Development team - Katy Ginger, Ethan Davis (thredds) and the ISO 8601 standard

  13. Temporal in the Framework (1) • Time AD - the ability to describe date/time ranges like: • 1965-06-23 12:00:00Z to 1974 • 1492 to 1505 either with time (in UTC) or not • Begin and end times must be specified • Time AD to present - the ability to describe date ranges like: • 1996 to Present either with time (in UTC) or not • Begin and end times must be specified

  14. Temporal in the Framework (2) • Time BC - the ability to describe date ranges: • -8700 to -2500 BC • No time allowed • Time relative - describe time ranges like: • 30 days ago to 0 days ago (present) • 1.2 billion years ago to 1.0 thousand years ago • 100 years forward to 1000 years forward (for use in modeling climate change) • Begin & end times must be specified

  15. Temporal in the Framework (3) • Named time period - the ability to associate specified date/time information with a named time period like 1920 to 1930, e.g. 'The Roaring 20's'. Sources for the name must be indicated, e.g., 'cataloger provided'. • Simple time period - the ability to name a recurring named time period without associating specified date/time information, e.g. 'spring semester', 'fall'

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