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) 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 2. 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) 3. Elevation - the vertical min & max of footprints (overarching box & detailed geos) with reference to ground or datum level 4. Planet or other body - the planet or body in our solar system for the geospatial footprint 5. 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) 6. Place-name not tied to coordinates - location name not specified by a geospatial footprint; (keyword searching only) 7. 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) 8. Event name not tied to coordinates - an event within an area that is not specified by a footprint; (keyword searching only) 9. 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. epoch / epoch2000.0)

8 Geospatial in the Framework (5) 10. 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) 11. 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 region of 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) 12. 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) 13. 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) A. Time AD - the ability to describe date/time ranges like: – :00:00Z to 1974 – 1492 to 1505 either with time (in UTC) or not – Begin and end times must be specified B. 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) C. Time BC - the ability to describe date ranges: – to BC – No time allowed D. 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) E. 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'. F. Simple time period - the ability to name a recurring named time period without associating specified date/time information, e.g. 'spring semester', 'fall'