- Tools for creation of formal metadata
- Metadata in Plain Language
How does the data set describe geographic features?
People need to know what
attributes of the geographic
features are supplied in the data set. The
spatial extent
of the geographical features is described explicitly by the data; what
are the other characteristics of the features such as scientific
measurements, identifiers and labels, or characteristics associated
with the geographic regions delimited by the features (population
within census tracts, for example)?
In spatial data sets, attributes are typically associated with
geographic features, although other arrangements are possible.
Describe the attributes of each type of feature together, since the
attributes of one type of feature are typically contained in one or a
few related digital files or tables.
You can describe the features and attributes using a
Detailed_Description, which is best, or
an
Overview_Description. Use an overview
only if
all of the details of the attribute values are explained
in some published source.
Features
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: Name of the feature type or table
Entity_Type_Definition: What is this feature or table?
Entity_Type_Definition_Source: Document, if any, that defines this type of feature.
If this type of feature or table isn't defined in some authoritative
publication like FIPS 173, and you don't know what to put in
Entity_Type_Definition_Source, leave
that element out. It is mandatory, but meaningless information
is worse than no information.
Attributes
For each attribute, you should know the attribute's
name in the
data set, a
definition of the attribute, and what
values
the attribute holds.
Attribute:
Attribute_Label: Name of the item or attribute
Attribute_Definition: What information does it provide?
Attribute_Definition_Source: Document, if any, that defines this attribute.
If this attribute isn't defined in some authoritative
publication like FIPS 173, and you don't know what to put in
Attribute_Definition_Source, leave
that element out.
What sort of values does the attribute hold?
In general, attributes either
measure,
categorize, or
characterize the features or entities they describe.
- Labels or names that characterize the features
Attribute_Domain_Values:
Unrepresentable_Domain:
Description of the values, like unabbreviated descriptive text, place names, identifiers without further scientific significance
- Text codes or integer numbers that categorize the features
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: One of the possible values
Enumerated_Domain_Value_Definition: What it means
Enumerated_Domain_Value_Definition_Source: Document, if any, that defines the value.
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Another possible value
Enumerated_Domain_Value_Definition: What it means
Enumerated_Domain_Value_Definition_Source: Document, if different, that defines the value.
. . .
If you have a simple table of values and definitions, you can use the
Enumerated_Domain Helper to code the metadata.
NOTE: An Enumerated_Domain does not have to contain only
numbers! Here the word enumerated means the values
are specified one by one in a list.
- Integers or decimal (floating- or fixed-point) values showing
some measure of the features
Range_Domain:
Range_Domain_Minimum: Lowest possible value
Range_Domain_Maximum: Highest possible value
What are the units?
Attribute_Units_of_Measure: units
Optional information about attribute values:
What is the resolution of the measurements?
Attribute_Measurement_Resolution: smallest meaningful difference
Were measurements made at regular time intervals?
- When did you start making measurements?
Beginning_Date_of_Attribute_Values: start date
- When did you stop making measurements?
Ending_Date_of_Attribute_Values: stop date
- How often did you make measurements?
Attribute_Measurement_Frequency: time interval
What about the accuracy of the values?
Attribute_Value_Accuracy_Information:
Attribute_Value_Accuracy: Quantitative estimate
Attribute_Value_Accuracy_Explanation: How did you estimate it?