A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

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a cross-platform GIS application licensed under the GNU General Public License.
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when ArcGIS for Desktop is the product and architecture that you are using from the ArcGIS platform.
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an open source interpreted programming language used in many GIS programs.
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A site-package created by Esri to expose GeoProcessing from ArcGIS to Python.
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an extension for the PostgreSQL object-relational database that adds support for geographic objects.
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a data format consisting of regular grids of values, usually stored in an image-like format.
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when ArcGIS 10.0 is the version you are using from the ArcGIS platform.
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the main application of ArcGIS for Desktop and the tag for that (arcgis-desktop) should normally be used in preference
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when ArcGIS 10.1 is the version you are using from the ArcGIS platform.
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an open source software server written in Java that allows users to share and edit geospatial data.
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a JavaScript library for creating dynamic map widgets for web sites. Use this tag for questions specific to Version 2 of the OpenLayers Javascript client toolkit.
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when ArcGIS 10.2 is the version you are using from the ArcGIS platform.
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A vector data storage format for storing the location, shape, and attributes of geographic features. Often referred to as 'an ESRI shapefile', as ESRI developed it.
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when ArcGIS for Server is the product you are using from the ArcGIS platform.
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GDAL (Geospatial Data Abstraction Library) is an open source translator library & set of command-line utilities for processing raster spatial data formats. As a library, it presents a single abstract …
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a set of COM-based APIs from ESRI Inc. that are used in several of their products including ArcGIS Desktop, ArcGIS Engine and ArcGIS Server.
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an open source object-relational database system.
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a prototype-based, object-oriented scripting language that is dynamic, weakly typed and has first-class functions.
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a collaborative project to create a free editable map of the world. The data is free, and free of legal and technical restrictions. OpenStreetMap is often shorted to OSM.
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On a map, a closed shape defined by a connected sequence of x,y coordinate pairs, where the first and last coordinate pair are the same and all other pairs are unique.
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when ArcGIS API for JavaScript is the web mapping API that you are using from the ArcGIS platform.
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Python bindings for QGIS.
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any method of representing the surface of a sphere or other three-dimensional body on a plane
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A reference framework consisting of a set of points, lines, and/or surfaces, and a set of rules, used to define the positions of points in space in either two or three dimensions.
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Statistical computing language and software environment.
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An Open-Source JavaScript Library for Mobile-Friendly Interactive Maps
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An application of ArcGIS for Desktop that is used to create, edit and manage models within its Geoprocessing Framework
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Use for questions seeking GIS data of any type - if you seek Open Data then ask on Open Data SE instead
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GRASS GIS (Geographic Resources Analysis Support System) is a free, open source geographical information system (GIS) capable of handling raster, topological vector, image processing, and graphic data…
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a standard protocol for serving georeferenced map images over the Internet
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Software plugins that add functionality to the QGIS package
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the version you are using of the OpenLayers JavaScript client toolkit.
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when ArcGIS 10.3 is the version you are using from the ArcGIS platform.
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a .NET programming language.
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a Software as a Service (SaaS) cloud computing platform that provides location intelligence and data visualization.
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a web mapping service application and technology provided by Google free (for non-commercial use),