International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B2. Istanbul 2004
Archive, the existing and proven FGDC metadata standard will
be used. Tools for FGDC to ISO migration will be provided by
ESRI.
This metadata standard will be compatible with Canada Federal
Government data clearinghouses which currently support
FGDC-CSDGM standard; such as the Discovery Portal
(formerly CEONet), EC Gateway, and CRYSIS.
3.3 Metadata Population
As described in the previous section, the format of the metadata
will be completely defined by international standards such as
CSDGM and eventually ISO. Deviation from standards would
hinder integration with other archives and would require effort
to duplicate or modify the functionality already provided by
software such as ArcCatalog and ArcIMS.
The creation of basic metadata for each data object will be
automated as much as possible. For example, simple attributes
such as scale, extents and structure will be extracted
automatically from the data. Other attributes will require
manual input. It is assumed that with most of the datasets, the
provider of the dataset will also supply suitable metadata.
Templates and examples will be available to be used as a guide
for meta-documenting.
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Figure 2: CIS Archive and Online Mapping
3.4 Geospatial Metadata and Footprints
The metadata required for the CIS Archive is geospatial. In
general terms, “geospatial” indicates that a spatial reference
(e.g. latitude and longitude co-ordinates) is a primary means of
storing and accessing information in the database.
Geospatial metadata allows the “footprint” of the data can be
superimposed on reference layers allowing the user to see the
geographic extent of the data object and thereby helping to
present more effectively the context of the data.
All data objects are loaded into CIS Archive through Archive
DAS process automatically. A geospatial footprint and a
browser graphics if possible are created while data is loaded
into database.
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3.5 Metadata Browse Graphics
The operational ISIS and WebServer databases have "quick
look” browse graphics which support the visual selection of
data objects. Browse graphics are typically small JPEG or
GIF/PNG files which have just enough visual resolution to help
the user evaluate the data object.
The CIS Archive Metadata Catalogue provides similar
functionality through the use of standard URL references.
Although technically possible, it is recommended by FGDC
and ISO that browse graphics are not stored internally within
the database (e.g. as BLOBs) due to their very small size and
non-mandatory status. Furthermore, the use of file based
browse graphics makes for easier integration with portals and
data clearing-houses.
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