The issue of sharing information about data has become a priority for many of us. With more and more data becoming
readily available (often for free) via the internet and from other spatial data clearinghouses there is lots of data sharing going on, however, often people are accessing,
downloading and using data without any knowledge of its origin, scale, sources, or recommended uses. In order to touch on
the topic of metadata, we're providing a primer to help you get started or at least get your wheels turning! We're
offering some details on the FGDC, a description of metadata, and a product you might consider to help you get rolling.
FGDC - www.fgdc.gov
The Federal Geographic Data Committee (FGDC) is tasked by Executive Order 12906
to develop procedures and assist in the implementation of a distributed
discovery mechanism for digital geospatial data. Using the data elements
defined in the Content Standards for Digital Geospatial Metadata,
governmental, non-profit, and commercial participants worldwide can
make their collections of spatial information searchable and accessible on
the Internet using free reference implementation software developed by the
FGDC. The Geospatial Data Clearinghouse is a collection of over 100 spatial data servers,
that have digital geographic data primarily for use in Geographic Information Systems
(GIS), image processing systems, and other modelling software. In April, 2000 the FGDC announced the
availability of a free Metadata Workbook.
FGDC CSDGM Metadata Workbook V.2.0 May 1, 2000 (PDF, 1 Mb)- The workbook complies with the latest
version of the FGDC Content Standard for Digital Geospatial Metadata
(CSDGM), FGDC-STD-001-1998 and contends both textual and color
graphical information about the FGDC CSDGM including background
information, how to read and use the Standard, a color graphical and
textual representation of the content information of the Standard, a
description of Profiles and User-defined metadata extensions, and some
metadata examples.
What is Metadata?
Simply defined, metadata is "data about data." Used in the context of digital
spatial data, metadata is the background information which describes the content, quality, condition, and other appropriate characteristics of
the data. Paper maps contain metadata, primarily as part of the map legend. In this form, metadata is readily apparent and easily transferred
between map producers and map users. When map data are in a digital form, metadata is equally as important, but its development and
maintenance often require a more conscious effort on the part of data producers and the chain of subsequent users who may modify the
data to suit their particular needs.(from "
Metadata Primer -- A "How To" Guide on Metadata
Implementation")
For an excellent tutorial on implementing metadata, the USGS has provided a section titled
"an approach for creating metadata". The document helps you to correctly
answer the following regarding your data:
- What does the data set describe?
- Who produced the data set?
- Why was the data set created?
- How was the data set created?
- How reliable are the data; what problems remain in the data set?
- How can someone get a copy of the data set?
- Who wrote the metadata?
FGDC - Hydrographic Data Standards
The Federal Geographic Data Committee (FGDC) has released the Hydrographic Data
Content Standard for
Coastal and Inland Waterways for a period of public review ending August
31, 2000. This public review provides software vendors and data users
and producers in all segments of the geospatial community with an
opportunity to comment on this standard in order to ensure that it meets
their needs.
The Hydrographic Data Content Standard for Coastal and Inland
Waterways was developed by the FGDC Bathymetric Subcommittee. The
objective of this standard is to develop a nationally focused hydrographic
data content standard for spatial data that supports safety of navigation.
This standard will provide a consistent catalog of terms and definitions
(semantics) to ensure uniform interpretation of information across a variety
of organizations that develop and use hydrographic feature data and
applications.
Persons interested in reviewing the Hydrographic Data Content Standard
may download the public review draft from the FGDC Standards page at
www.fgdc.gov/standards/status/sub5_5.html. All reviewers are
strongly urged to use the Review Comment Template at
www.fgdc.gov/standards/directives/dir2d.html when preparing and
submitting comments. Reviewers may send their comments to
gdc-hydro@www.fgdc.gov.
Update from the FGDC, May 19, 2000
The FGDC has released the Digital Cartographic Standard for
Geologic Map Symbolization for a period of public review ending
September 15, 2000. This public review provides software vendors and
data users and producers in all segments of the geospatial community with
an opportunity to comment on this standard in order to ensure that it meets
their needs.
The Digital Cartographic Standard for Geologic Map Symbolization
was developed by the FGDC Geological Data Subcommittee. This draft
standard is intended to provide to the Nation's producers and users of
geologic-map information a single, modern standard for the digital
cartographic representation of geologic features. The draft standard
provides descriptions, examples, cartographic specifications, and notes on
usage for a wide variety of symbols that may be used on a typical digital
geologic map or related product (for example, cross sections). The
standard is scale-independent, meaning that the symbols are appropriate
for use on geologic maps at any scale. It applies to geologic-map
information published by the Federal government in both offset-print and
plot-on-demand formats. It also is suitable for use in electronic publications
(for example, Portable Document Format (PDF) documents) and for
display by computer monitors. Non-Federal agencies and private
companies that produce geologic-map information are encouraged to
adopt the standard once the FGDC endorses the standard.
Persons interested in reviewing the Digital Cartographic Standard for
Geologic Map Symbolization may download the public review draft, in
Portable Document Format (PDF), from the
FGDC Geological Data
Subcommitee web page. Reviewers are strongly urged to use the
Review Comment Template when preparing and submitting comments.
Reviewers may send their comments by E-mail to
mapsymbol@geology.usgs.gov.
SMMS3 oh! for publishing FGDC Compliant metadata
SMMS is user friendly and will help users become familiar with FGDC standards. The software creates data that
can be easily updated, supplemented, shared and published. In addition, SMMS has import features that allow
bulk loading of datasets. The product makes it easy for anyone, regardless of prior knowledge
of the FGDC standard, to create, manage and publish FGDC compliant metadata.
SMMS 3.1 ties data and metadata by allowing you to associate a SMMS metadata record with the actual GIS data layer it describes.
The MetaGate data catalog is a new tool that bridges the gap between data and metadata and provides a new level of access to and control
over your GIS data library. With MetaGate, you can view SMMS metadata side-by-side
with the GIS data layer it describes, open SMMS records using a Windows™-style tree
view and quickly locate metadata records using a powerful yet simple Search
interface.
What is MetaGate?
MetaGate is a complete feature set that ships with SMMS that allows users to view, search and
evaluate GIS data and metadata simultaneously. The MetaGate viewer presents the location of a
given dataset on a network, a map image of the dataset and summary metadata for the dataset all on
one screen. MetaGate also allows you to search for a dataset using keywords, time period or by
dragging your mouse pointer over a map to select a geographic search area. MetaGate saves GIS
analysts hours they would otherwise spend searching for the dataset that best suits their needs.
Once you've associated a SMMS record with a GIS
data layer, you can extract metadata elements like bounding coordinates, point and
vector object counts, native data environment and enity/attributes directly from the GIS
data into SMMS fields. Support for coverages, shapefiles, GeoMedia Access, and
major image formats.
SMMS 3.1 Features:
- Advanced Searching
- User Defined Fields
- Publish Browse Graphics to the Web
- Context-sensitive Online Help
- Multi-User Access
- Data Re-Use
- Metadata Templates
- Re-usable Keyword Lists
- Import
- Metadata Publishing
- Biological Profile
Details and demos on SMM3 oh! can be found at http://www.rtseusa.com/
A Site For Your Bookmarks!
If your searching for international data you might consider
clearinghouse4.fgdc.gov/registry/clearinghouse_sites.html
browsing the extensive list of participating FGDC websites. There are a large number of organizations listed here that
make spatial data and metadata available via the internet.
Metadata Tutorials:
Other Metadata Resource on the web:
ANZLIC Core Metadata Elements for Land and Geographic Directories in Australia and New Zealand
UC Berkeley - A Brief Introduction to Metadata for GIS Data