introducing geospatial metadata ---1 don’t duck metadata introducing geospatial metadata a...
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Introducing Geospatial Metadata ---1
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Introducing Geospatial Metadata
A Metadata Workshop
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Workshop objectives
• Introduction to metadata, its importance, role, and the FGDC metadata standard.
• This workshop is designed to be a hands-on session where you will work with your own data. By the end of the workshop, you should have 1) a sample record that documents your data, and 2) ideas for how to make metadata work for your project.
• All participants should finish the workshop by getting involved in the “metadata movement”.
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Outline:
• Introduction to metadata.
• Metadata Content
• Schema
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1. What is metadata?
2. Why is it important?
3. Executive Order 12906
4. The FGDC Geospatial Data Clearinghouse
TOPIC 1: Introduction to Metadata
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1.1: What is Metadata?
Components of Data
Metadata is the component of data that describes it. (data about data)
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• Needed for appropriate use of data
• Needed for appropriate management of data.
Metadata is an important component of spatial data
1.2: Why is it important?
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examples:
• Spatial Referencing Systems
• Entity and Attribute Classification
• Data Collection Technique
Metadata is needed for appropriate use of data
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Spatial Referencing Systems
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Data reflect the purposes of the creator!
Entity and Attribute Classification
Wetland delineation as defined by investment bankers
Wetland delineation as defined by conservationists
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Data lineage and Data accuracy.
Without metadata, how can a user identify the source of this error?
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Metadata is also needed for appropriate management of data.
• Protect data from being lost.
• Preserve data over time.
• Promote good science.
• Provides the foundation of a National Spatial Data Infrastructure
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1.3: Executive Order 12906
FGDC metadata, and the National Spatial Data Infrastructure.
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FGDC MetadataFederalGeographic DataCommittee
Executive Order 12906 mandates that all Federal agencies and organizations receiving federal funds must document all geospatial data using the FGDC metadata format
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Single-use data:
Data are seen as a means to an end.
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Multiple-use data:
Data are seen as central
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Spatial data collection, and acquisition
are major obstacles of spatial analysis.
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• Search,
• Suitability decisions
• Subsequent users need information
Metadata is mandated by EO 12906 to facilitate the NSDI
Metadata is the foundation of the NSDI
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1.4: The FGDC Geospatial Data Clearinghouse
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The data set is then distributed in its entirety!
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FGDC compliant metadata:
• A record of all the information needed to effectively use a data set for analysis.
• The only manner in which to contribute to the National Spatial Data Infrastructure
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1. The Content Standard for Digital Geospatial Metadata
2. Metadata Content
3. Exercise: The Metadata Content Questionnaire!
TOPIC 2: Metadata Content
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2.1 The Content Standard for Digital Geospatial Metadata
The CSDGM specifies needed information and a strict structure!
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The structure of the FGDC metadata
standard can be confusing. . . at first.
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The structure of the FGDC metadata standard is a strength!
• Contribution to NSDI needs only a text editor
• Machine-readable structure enables sgml and xml encoding
• Structure enables extensibility• Shared elements enable data-type-level
documentation• The FGDC standard is flexible enough to
document multiple types of spatial data.
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Data producers write Metadata!
• Metadata consists of important information about the data.
• Most of the information required by the CSDGM is dealt with during data production
• Once the scientist, or data producer, is familiar with the standard, writing metadata is easy!
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2.2 Metadata Content
The structure is simply the means by which the content is searched, displayed, and used!
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The CSDGM divides your metadata into “bits of information” that can be manipulated, shared, searched and displayed.
The CSDGM builds a Bridge between data producers, and computers.
metadatasearch and display
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Bits of information
• Abstract
• Purpose
• Attribute Accuracy Report
• Grid Coordinate System Name
• Entity Type Definition
• Distribution Liability
• Metadata Contact
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2.2 Exercise: The Metadata Content Questionnaire
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Topic 3: Schema
1. Sections2. Data Elements and Compound
Elements3. The Graphical Representation 4. Exercise: Navigating the Graphical
Representation. . . Writing FGDC metadata!
5. Validating metadata
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3.1: Sections
Our “bits of information” are grouped into 7 main sections, and 3 supporting sections.
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3.2: Data Elements and Compound Elements
Within each section, data elements (bits of information) can be further grouped into compound elements.
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3.3: The Graphical Representation
The Graphical Representation is an invaluable tool to help navigate the standard!
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Graphical Representation of Elements
Sections, compound elements, and data elements are represented by these symbols.
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Conditional usage
Element conditionality is color coded.
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Repeatability
Some elements are repeatable.
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Navigation
Sometimes the standard requires that you omit one section in favor of another.
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3.4: Exercise: Navigating the Content Standard for Digital Geospatial Metadata.
In this exercise, we will “plug” our metadata content into the appropriate FGDC structure.
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From “bits of information” to FGDC Metadata!
In this exercise, we will take our content, which looks like this. . . . .
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and make FGDC metadata, which looks like this. . . . . . .
From “bits of information” to FGDC Metadata!
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Writing Metadata!
