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What the GIS stack includes
Think of a GIS stack as a path that geographic information can travel: it is collected or created, stored, analyzed, published, and then used in desktop, browser, or mobile applications. The layers can be combined in different ways. A small project may rely mainly on files and desktop software; a shared or web-based system may add a spatial database and server.
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| Layer | What it does | Examples |
|---|---|---|
| Data and formats | Represents places, boundaries, measurements, imagery, and other geographic information. | Vector features; raster data; GeoPackage, Shapefile, GeoTIFF, and MBTiles. |
| Spatial storage | Keeps data available for editing, querying, or use by multiple applications. | Spatial files and databases such as PostgreSQL or SQLite/SpatiaLite. |
| Desktop and analysis | Connects to data, supports editing and visualization, runs analysis, and prepares maps. | QGIS is one example of a desktop GIS. |
| Servers and APIs | Publishes maps, data, or processing capabilities over a network. | QGIS Server and OGC service interfaces. |
| Client applications | Let people view, query, edit, or collect geographic information. | Desktop, browser, and mobile applications. |
| Standards | Define shared interfaces so different systems can exchange or request geospatial information. | WMS, WFS, OGC API – Features, WCS, and WPS. |
These are roles, not mandatory separate products. One application may cover more than one layer, and an implementation can substitute components so long as the necessary data and interfaces remain compatible.
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Vector and raster data
Vector data represents discrete geographic features, such as points, lines, and polygons. Raster data represents information as a grid of cells, commonly used for imagery and continuous measurements. A GIS may work with both, and a single project may combine them.
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QGIS documentation lists formats including GeoPackage and Shapefile for spatial data, and GeoTIFF and MBTiles for raster data. It also documents connections to databases including PostgreSQL, SQLite/SpatiaLite, Oracle, Microsoft SQL Server, SAP HANA, and MySQL. These examples describe QGIS support, not a guarantee that every format or database is available in every installation: compatibility can depend on the software build and its external libraries.
Files and spatial databases
Files can be a practical way to store and move data for a project. A spatial database adds shared storage and spatial query capabilities; it may suit workflows where data needs to be managed centrally or accessed by multiple applications. QGIS documents both file-based sources and database connections.
There is no universal database choice established by these examples. Consider how many people need access at once, how editing and data management will work, where the system will be deployed, licensing, staff skills, and interoperability requirements.
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Where editing, mapping, and analysis happen
A desktop GIS can connect to local files, spatial databases, and network services. It can support data editing, visualization, analysis, and cartography—the preparation of maps. Those capabilities make desktop GIS useful both as a working environment and as a client for data managed elsewhere.
QGIS describes native vector and raster analysis tools, along with processing integrations for GDAL, SAGA, GRASS, OTB, and R. These are examples from the QGIS ecosystem, not an exhaustive list of GIS analysis software. Which tools are available depends on the installed software and configuration.
Analysis might prepare a dataset for a map, answer a spatial query, or produce an output layer for other users. The result can remain in a file or database, or be published through a server interface. Keeping those responsibilities distinct helps explain why a GIS is better understood as a stack than as a single application.
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How GIS servers deliver data to applications
A GIS server makes maps, geographic data, or processing capabilities accessible over a network. A client can request information from that server instead of relying only on a local copy of a dataset. QGIS Server is one example: its documentation describes using QGIS for GIS logic and map rendering, and lists support for WMS, WFS, OGC API Features, and WCS.
OGC WPS defines requests and responses for geospatial processing. It addresses a different job from an interface that primarily serves map images or geographic features: it provides a way for clients to request processing operations. The particular operations and behavior available depend on the implementation.
What web GIS adds
Web GIS delivers geographic information through networked applications. A typical user may open a map in a browser, interact with it, and request data or map content from services. Web applications commonly combine web technologies with those GIS services; the exact architecture varies by project.
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People may also use desktop or mobile clients. Mobile workflows can be designed for field use, while browser applications can make maps accessible without installing a desktop GIS. Whether a particular system supports offline work, editing, or a given device is an implementation decision, not an automatic property of GIS.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How GIS standards support interoperability
Open Geospatial Consortium (OGC) standards define interfaces for exchanging or requesting geospatial content. Their roles differ, so selecting a compatible standard means matching the interface to what the client needs.
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|---|---|---|
| WMS | Returns rendered map images. | Useful when a client needs map imagery rather than feature-by-feature access. |
| WFS | Provides feature-level access, including query and transaction operations. | OGC says WFS remains a reliable means of providing geospatial data to the web, while encouraging implementers to consider the newer OGC API – Features standard. |
| OGC API – Features | Provides feature access through a modern web API. | OGC presents it as a newer way to provide functional capabilities available through WFS; that guidance does not mean WFS is obsolete or unsupported. |
| WCS | Provides access to raster or coverage data. | Supported interfaces and behavior depend on the server implementation. |
| WPS | Defines requests and responses for geospatial processing. | It is about processing, rather than simply returning a rendered map. |
QGIS documentation identifies QGIS Server, UMN MapServer, and GeoServer as server options. A standard can make exchange easier, but it does not by itself guarantee that two implementations support the same versions, operations, configuration, or data. Check the actual server and client capabilities when planning an integration.
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How to choose an architecture
Open-source, commercial, cloud-hosted, and hybrid systems can all be assembled from different combinations of these layers. Compare the architecture against the work it must support rather than assuming one approach is best for every organization.
- Data ownership and formats: Identify where authoritative data lives and whether it can be used in the formats and systems your teams need.
- Editing and collaboration: Determine who can edit which datasets and whether several users need shared access.
- Interoperability: Check required services, API support, and the client systems that must connect.
- Queries and processing: Establish what spatial queries and analysis workflows are needed, and where they will run.
- Users and access: Account for desktop, browser, and mobile users, including any field or offline requirements.
- Operations: Consider deployment, security, maintenance capacity, licensing, and total cost.
Available documentation establishes common component roles and interfaces, but it does not provide a universal performance benchmark or vendor ranking. Architecture choices should be based on the data, workload, users, and operational constraints of the specific GIS.
Documentation and version context
The QGIS examples above reflect its 3.44 documentation for data sources, features, and server, and its 4.2 documentation for client protocols. OGC’s WFS and WPS pages were accessed on October 7, 2026. Capabilities and standards guidance can change, so confirm the documentation for the versions and implementations you plan to deploy.
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