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The relevant data about entities in the graph and relationships between them are located in the appropriate worksheet in row format. For example, the edges worksheet contains a minimum of two columns, and each row has a minimum of two elements corresponding to the two vertices that make up an edge in the graph.
There are also many different types of geodata, including vector files, raster files, geographic databases, web files, and multi-temporal data. Spatial data or spatial information is broader class of data whose geometry is relevant but it is not necessarily georeferenced , such as in computer-aided design (CAD), see geometric modeling .
.IND (Optional index file for tabular data. This is present if any columns are indexed). To view geographic information (the graphic representation of data) in MapInfo Professional, two additional files are required and added to the basic requirements for simply viewing data. Minimum files required to view a map with the data previously discussed:
Web-based (Cloud SaaS) CARTO www.carto.com Spatial data science & location intelligence Spatial SQL, spatial data science, location analytics, site selection, data visualization, mapping, geocoding and app development. Access to a catalog of 1,000s of spatial datasets. Proprietary (with free trial available). Fract No
Global hydrological data based on the SRTM elevation data. Includes river networks, watershed boundaries, drainage directions, and flow accumulations. USGS Land Cover Institute: Set of links from the USGS for numerous land cover datasets. Although primarily US data, further down the list there is data for other continents.
Geographic Data Files (GDF) is an interchange file format for geographic data. In contrast with generic GIS formats , GDF provides detailed rules for data capture and representation, and an extensive catalog of standard features, attributes and relationships.