CSDGM: Content Standard for Digital Geospatial Metadata

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CSDGMContent Standard for Digital Geospatial
Metadata

• February 7, 2006
• Geog 458 Map Sources and Errors

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Outlines

• NSDI
• Metadata
• CSDGM Overview
• CSDGM Structure syntax
• CSDGM Details
• Creating CSDGM-compliant metadata

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NSDI

• NSDI
• Human resources, technology, standard, and policy
  for geospatial activity
• Vision of NSDI
• Effective utilization of geospatial data for
  better understanding of environments critical to
  our future data should be accessible,
  integrated, and managed in an effective manner
• Core components of NSDI
• Partnership, data, framework, metadata,
  clearinghouse, standard

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2. Role of metadata

• Availability
• Access
• Fitness of use
• Data transfer
• Q. Which sections should you look up in the
  metadata for each task?

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Value of metadata

• Its like a food label
• whats in it?
• Its like an insurance
• e.g. accuracy of data for disaster management
• Enhance data value
• Its investment in future
• Eliminate duplication efforts
• Effective data integration for effective
  problem-solving

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CSDGM

• This is FGDC (U.S.) content standard for digital
  geospatial metadata
• First version 1994
• Second version 1998
• Data created with public funding should make
  metadata available in a way that they are
  compliant with CSDGM
• How do you know if its CSDGM-compliant or not?
• Transition to ISO (International) standard

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CSDGM

• Its complex and detailed because it handles
  extensive spatial data set
• e.g. vector file, remote sensing image, table
• Same reason that SDTS is complex
• Its structured because it should be read by
  computer (national geospatial clearinghouse) for
  electronic search i.e. it should be parsable
• It uses common terms (do you understand the
  meaning of terms used in CSDGM?)
• It is hierarchically organized (does structure in
  metadata make sense to you?)

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CSDGM structure

• It uses common terms
• Name of different elements are uniform
• It is hierarchically organized
• Sections gt compound elements gt data elements
• Sections are divided into primary sections and
  supporting sections
• Primary sections common contents of CSDGM (e.g.
  identification to metadata_reference) reflecting
  intrinsic elements of geospatial data (e.g.
  georeferencing, spatial data structure)
• Supporting sections referred in multiple times
  by primary sections (e.g. contact, time period)
  thus cannot be used alone

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CSDGM syntax

• Understanding production rules
• It specifies composition rules
• is AND, is OR
• It specifies whether its mandatory or not
• means MANDATORY
• 01 means MANDATORY IF APPLICABLE
• What does it mean by mandatory if applicable?
• () means OPTIONAL
• It specifies repeatability of elements
• 0N means that this element can be repeated
  none to many

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Production rules examples

• Metadata
• Identification_Information
• 0Data_Quality_Information1
• 0Spatial_Data_Organization_Information1
• 0Spatial_Reference_Information1
• 0Entity_and_Attribute_Information1
• 0Distribution_Informationn
• Metadata_Reference_Information

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Production rules examples

• Spatial_Data_Organization_Information
• 0Indirect_Spatial_Reference1
• 0Direct_Spatial_Reference_Method
• ( Point_and_Vector_Object_Information
• Raster_Object_Information )1
• Do the same for Spatial_Reference
• Do the same for Entity_and_Attribute

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CSDGM details

• Draw tree-like diagrams for each section, and
  make sense out of them, also relate them to your
  previous knowledge
• Main components of geographic information
• Identification gt keywords
• Spatial data structure
• Spatial_Data_Organization
• Projection, geodetic datum
• Spatial_Reference gt Planar gt
• Level of measurement
• Entity_and_Attribute gt gt domain values

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CSDGM details

• Lets go over some unfamiliar terms
• Identification gt Spatial Domain gt
• Bounding coordinates vs. Data set G-Polygon
• Data Quality gt Attribute/Positional Accuracy gt
• Accuracy report vs. Quantitative Assessment
• Lineage use of abbreviation in source and
  process step
• Spatial Reference gt
• Local planar system
• Local system
• Resolution for raster vs. vector
• Scale factor, false easting/northing

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CSDGM details

• Entity and Attribute gt
• Detailed description vs. overview description
• Entity is table, attribute is column in the table
• Domain values of attribute enumerated, range,
  codeset, unrepresentable
• Distribution
• Resource description

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Metadata types

• You can create different kinds of metadata
• Formal vs. informal
• Formal metadata CSDGM compliant
• E.g. USGS data catalog
• http//geo-nsdi.er.usgs.gov/
• Informal metadata doesnt conform
• E.g. King County GIS Center geoguide
• Access from WAGDA
• Minimal vs. quality
• You can create minimal metadata
• Required http//www.lic.wisc.edu/metadata/acmemin
  .htm
• Denver core http//www.lic.wisc.edu/metadata/denv
  core.htm
• You can create quality metadata such that users
  can determine the fitness of use

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Metadata formats

• CSDGM does not specify format, but rather content
  as indicated by name
• Thats why metadata looks different (see note
  section for link to different metadata)
• Can be in the format of html, text, xml

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Creating metadata

• So how do I create metadata?
• hard copy approach
• You know the title/subtitle, and what to fill in
• digital copy approach
• Use metadata creation tool
• Demo tkme from USGS
• How do I know this metadata conforms to FGDG
  Content Standard?
• By understanding production rules, do this
  manually?
• Use software (e.g. mp from USGS)

EVENT1 will walk you through this.
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For P2 (Lineage report)

• If metadata is in a good condition, use them
• Otherwise, talk to persons referred in metadata
• Look up sample metadata from USGS data catalog,
  and emulate them
• http//geo-nsdi.er.usgs.gov/
• Write in two pages or so even though it will vary
  highly depending on data