Table 2 Two-dimensional data formats
2D DATA MODELS | |||||
|---|---|---|---|---|---|
CAD (DXF) | KML | SHP | GeoJSON | OpenStreetMap | |
Primary Purpose | CAD can be used to represent 2D and 3D drawing design data and enable interchange between AutoCAD and other software. | This XML-based format is used to encode representations of geographic data for visualization in internet-based 2D web-browsers, mobile applications or Google Earth | SHP is used to store the location, shape and attributes of geographic features. | GeoJSON, based on JavaScript Object Notation, is used to represent simple geographical features, along with their non-spatial attributes. | OSM uses data stored in attributes to represent features such as doors, windows and walls. |
Supporting Organization | AutoDesk | OGC and Google | ESRI | Maintained not by a formal organization but by a working group of developers, the GeoJSON working group. | Hosted by many organizations around the world, including Univ College London, Bytemark, iWay (Switz), Yandex (Russia) |
Exampls of Software used for Viewing | AutoCAD, LibreCAD, ArchiCAD and many other types of CAD software | Google Earth | ESRI ArcGIS, QGIS and many other GIS softwares | GDAL, QGIS, SAFE FME, OpenLayers | Standard web browsers that are capable of reaching sites such as iD-indoor, OpenLevelUp or IndoorOSM or Vespucci |
Description of Geometry | The graphical objects are described as entities and represented by group codes in a DXF file. These entities include geometric objects such as points, lines, polylines, circles, solids and surfaces. | Geometries can be defined in KML using a tag-based structure. | Shapefiles can define 3 types of geometries: points, lines or polygons. Each feature has a set of associated attributes that describe the feature. | GeoJSON describes objects as one of Point, LineString, Polygon, MultiPoint, MultiLineString, MultiPolygon, or GeometryCollection. | OSM is defined with 3 types of data: nodes, ways and relations. These data types contain attribute information describing the feature each represents. |
Representation of Object Location | An SRS is defined for a file with respect to the center defined for the project. | All KML files use the World Geodetic System of 1984 (WGS 84). | An SRS is associated with the file. | An SRS is associated with the file. | OSM can use either WGS84 or Mercator. |