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Metadata

Metadata. Recognize ! the nutrition label required by the U.S. Food and Drug Administration on all food packaged for retail use. U.S. has been putting some form of labels on food since 1913. Today, this label with its mandatory and voluntary

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Metadata

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  1. Metadata

  2. Recognize ! the nutrition label required by the U.S. Food and Drug Administration on all food packaged for retail use. U.S. has been putting some form of labels on food since 1913. Today, this label with its mandatory and voluntary components, tells the consumer everything they need to know to make an informed decision about the food’s ingredients and nutritional content.

  3. Sound familiar? • Just as food is our body’s fuel, spatial data is the GIS’s fuel. • How do you determine the “really good stuff” from the “junk food”? • How do you know if the spatial data is “good” for your system? • How do you know how to read the ingredient list and what the terms mean?

  4. In 1994, and its subsequent revision in 1998, the Federal Geographic Data Committee, FGDC, adopted the content standard for digital geospatial metadata to label or document geospatial datasets. • Like a company whose product is food, the metadata standard documents the characteristics of data to allow consumers to determine the data’s fitness for their use.

  5. Metadata or "data about data" describe the content, quality, condition, and other characteristics of data. The Federal Geographic Data Committee approved the Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998) in June 1998. URL:http://www.fgdc.gov/metadata/metadata.html

  6. Why Metadata? The major uses of metadata are: -Organize and maintain an organization’s internal investment in spatial data -Provide information about an organization’s data holdings to data catalogues, clearinghouses, and brokerages -Provide information to process and interpret data received through transfer from an external source

  7. STANDARD • What do we need to know about our datasets? • The standard provides a common set of terminology and definitions for the documentation of geospatial data, including data elements for the following topics:

  8. Identification Information • Data Quality Information • Spatial Data Organization Information • Spatial Reference Information • Entity and Attribute Information • Distribution Information • Multi-use Information • Extensibility

  9. Identification Information: • Basic information about the data set • Examples include • title, • geographic area covered, • currentness, • and rules for acquiring or using the data.

  10. Data Quality Information • An assessment of the quality of the data set. Examples include • Positional and attribute accuracy, • Completeness, • Consistency, • Sources of information • Methods use to produce the data

  11. Spatial Data Organization Information • The mechanism used to represent spatial information in the data set. Examples include • The method used to represent spatial positions directly (such as raster or vector) • And indirectly (such as street addresses or county codes) and • The number of spatial objects in the data set.

  12. Spatial Reference Information • Description of the reference frame for, and means of encoding, coordinates in the data set. Examples include • The name and parameters for map projections or grid coordinate systems • Horizontal or vertical datums • Coordinate system resolution

  13. Entity and Attribute Information • Information about the content of the data set, including the entity types and their attributes and the domains from which attribute values may be assigned. • Examples include • The names and definition of features, • Attributes • And attribute values

  14. Distribution Information • -Information about obtaining the data set. • Examples include • contact information for the distributor, • Available formats, • Information about how to obtain data sets online or on physical media (such as • CD-ROM) and • Fees for the data.

  15. Multi-Use Sections • The standard has multi-use sections that specify contact information for organizations or individuals that developed or distribute the data set, • Temporal information for time periods covered by the data set, and • Citation information for the data set and information sources from which the data were derived.

  16. Extensibility • The standard provides a methodology and process for data producers or user community to profile and extend their metadata beyond the base standard to meet individual organizations and discipline requirements.

  17. FGDC/ISO METADATA STANDARD DEVELOPMENT AND HARMONIZATION • Since 1996, the FGDC has been actively involved in the International Organization for Standardization Technical Committee 211 in the development of a International Metadata Standard. • In 2003 the American National Standards Institute will formally adopt the international standard. FGDC will develop and adopt a profile or profiles of the ISO Metadata Standard.

  18. METADATA Examples • http://www.census.gov/geo/www/tlmetadata/tl2002meta.txt • http://geochange.er.usgs.gov/pub/sea_ice/Contents/FGDCmeta.txt • http://geochange.er.usgs.gov/pub/PRISM/OFR_94281/Contents/FGDCmeta.txt • http://geochange.er.usgs.gov/pub/volcanos/OFR_94212/Contents/FGDCmeta.txt • http://geochange.er.usgs.gov/pub/NWR/OFR_91-346/Contents/FGDCmeta.txt • http://geochange.er.usgs.gov/pub/NWR/OFR_93-218/Contents/FGDCmeta.txt • http://geochange.er.usgs.gov/pub/deserts/OFR_95-78/Contents/FGDCmeta.txt

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