GIS standards categories describe different parts of making geographic information understandable and interoperable. There is no single universal category list: a standard may define data concepts, metadata, an encoding, a service interface, or conventions for a particular subject area—and it can fit more than one category.
What does “category” mean for GIS standards?
It depends on the classification axis. One useful way to group standards is by function: what the data means, how it is represented, or what operations a service supports. Another is by subject, such as metadata, imagery, elevation, or water. These axes overlap rather than forming mutually exclusive boxes. A domain-specific standard, for example, may also define a data model and an encoding.
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The map below is a practical synthesis of descriptions from the Open Geospatial Consortium (OGC) and the Federal Geographic Data Committee (FGDC); it is not a taxonomy formally adopted by either organization.
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|---|---|---|
| Conceptual model or content | What entities, attributes, relationships, and constraints should the data represent? | OGC describes conceptual-model standards as defining common concepts and relationships. FGDC framework schemas specify feature and attribute types, domains, relationships, spatial representation, organization, and metadata. OGC functional types; FGDC framework data |
| Encoding | How is information organized or represented for exchange or processing? | OGC identifies encoding standards as rules for organizing information. FGDC lists ISO 19118 as a geographic-information encoding standard. OGC functional types; FGDC standards listing |
| Interface or service | What operations can a requester perform with a provider or service? | OGC service families include WMS, WFS, WCS, and WPS. Catalogue services support publishing and searching metadata. Check the current record for the applicable version and status. OGC functional types; OGC standards catalogue; OGC Catalogue Service Standard |
| Metadata and discovery | What descriptive information helps people or software assess and find a resource? | The ISO 191xx metadata suite includes a core and related extensions or encodings; metadata can describe data and services. FGDC also publishes its Content Standard for Digital Geospatial Metadata (CSDGM). FGDC on ISO metadata; FGDC metadata guidance |
| Domain-specific content | What conventions apply to a particular subject or data theme? | FGDC’s framework standard covers seven National Spatial Data Infrastructure (NSDI) themes. OGC’s catalogue includes subject-focused standards such as CityGML and WaterML. A domain standard may also define models, encodings, or interfaces. FGDC framework data; OGC standards catalogue |
How the main categories differ
Content models define meaning
A content model describes the concepts represented in a dataset and how its elements relate. It can specify feature types, attribute types and permitted values, relationships, spatial representation, and organization. This is the level to examine when two datasets use the same word for a feature but may mean different things, or when an exchange needs consistent fields and relationships.
FGDC’s Geographic Information Framework Data Standard is an example for selected NSDI themes. Its schemas cover cadastre, imagery, elevation, geodetic control, government units and administrative/statistical boundaries, inland water, and transportation. The framework specifies common exchange requirements for those themes; it does not establish one universal content model for every GIS dataset. FGDC framework data
Metadata standards describe and support discovery
Metadata records information that helps users and systems understand, assess, and find a resource. It may describe a dataset or a service. FGDC describes ISO 19115-1 as the fundamental standard at the center of the ISO metadata suite, which also includes related standards for extensions, associated information, and XML encoding or validation. FGDC on ISO metadata
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Metadata content and metadata encoding are distinct concerns: content standards define elements and their properties, while encoding rules specify how metadata is structured in a format such as XML and how it can be validated. The two may be used together, but they answer different implementation questions. FGDC metadata explanation
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Encodings represent information for exchange
An encoding specifies rules for representing or organizing information so it can be exchanged or processed. It does not, by itself, settle every question about what a feature means or what operations a service offers. FGDC lists ISO 19118 as a geographic-information encoding standard and distinguishes encoding rules from media, transfer services, and protocols. FGDC standards listing
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Interfaces and service standards define operations
An interface standard describes operations between a service provider and a requester. OGC’s catalogue includes the WMS, WFS, WCS, and WPS service families. OGC’s Catalogue Service Standard describes interfaces, bindings, and application profiles for publishing and accessing catalogues of metadata about geospatial data, services, and related resources. The names alone do not establish which version or status suits a project; verify the current standard record before implementation. OGC standards catalogue; OGC Catalogue Service Standard
Domain standards apply conventions to a subject area
A subject-focused standard narrows general patterns to a domain, theme, or community. CityGML and WaterML are examples in OGC’s catalogue; FGDC’s framework standard is organized around selected NSDI themes. “Domain-specific” describes the subject, not necessarily the technical form: a domain standard can also prescribe content, encoding, or service behavior. OGC standards catalogue; FGDC framework data
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How to use the categories in a real project
Consider exchanging road-network features. The project needs to establish what counts as a road feature and which attributes and relationships matter; how those records will be encoded; and whether they will be transferred as files or accessed through a service. It must also identify the relevant community or jurisdiction’s profile and requirements. These are separate standards concerns, and no single combination is prescribed for every project. OGC functional types; FGDC framework data; FGDC standards context
- Define the task. Decide whether the immediate need is documenting resources, exchanging data, publishing a service, enabling discovery, or supporting analysis.
- Identify the subject and scope. Determine whether a general geospatial standard is sufficient or a domain or theme-specific convention is needed.
- Set the interoperability boundary. Decide whether the requirement concerns a content model alone, a serialized representation, service operations, or an integrated profile.
- Check governance and adoption. Confirm the issuing organization, applicable consensus or endorsement process, jurisdiction, and any policy or procurement requirement.
- Check implementation fit and status. Review the current standard record, schema or encoding, software support, and the data or service already in use.
How U.S. federal metadata guidance fits
FGDC lists both ISO 191xx metadata standards and its CSDGM. Its guidance says federal agencies are directed toward voluntary consensus standards and that ISO metadata standards are endorsed and encouraged for NSDI stakeholders. That is U.S. federal and NSDI context, not a universal requirement for all organizations or jurisdictions. Confirm the rules that apply to the organization and project in question. FGDC standards listing; FGDC metadata guidance
What GIS standards accomplish together
OGC characterizes its standards program this way: “Together, these standards define interoperable approaches to geospatial data organization, access, processing, visualization, and discovery.” This is OGC’s description of its standards program, not an independent measurement of implementation outcomes. OGC standards-program explainer
For any particular organization, the applicable standards depend on jurisdiction, sector, data theme, policy or procurement rules, existing systems, and whether the task is documentation, exchange, service publication, or analysis. OGC and ISO materials have broader standards scopes, while FGDC sources provide U.S. federal and NSDI examples. Verify the relevant authority’s current record before implementation. FGDC standards listing; FGDC metadata guidance; FGDC standards context
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