Search results
Results from the WOW.Com Content Network
GeoJSON [1] is an open standard format designed for representing simple geographical features, along with their non-spatial attributes.It is based on the JSON format.. The features include points (therefore addresses and locations), line strings (therefore streets, highways and boundaries), polygons (countries, provinces, tracts of land), and multi-part collections of these types.
Well-known text (WKT) is a text markup language for representing vector geometry objects. A binary equivalent, known as well-known binary (WKB), is used to transfer and store the same information in a more compact form convenient for computer processing but that is not human-readable.
This is the basis of most modern file formats, including spatial databases that include a geometry column along with the other attributes in a single relational table. Other formats, such as GeoJSON, use different structures for geometry and attributes, but combine them for each object in the same file.
GML defines features distinct from geometry objects. A feature is an application object that represents a physical entity, e.g. a building, a river, or a person. A feature may or may not have geometric aspects. A geometry object defines a location or region instead of a physical entity, and hence is different from a feature.
The Rust library geo_types implements geometry primitives that adhere to the simple feature access standards. [ 15 ] GeoSPARQL is an OGC standard that is intended to allow geospatially- linked data representation and querying based on RDF and SPARQL by defining an ontology for geospatial reasoning supporting a small Simple Features (as well as ...
The main file (.shp) contains the geometry data. Geometry of a given feature is stored as a set of vector coordinates. [1]: 5 The binary file consists of a single fixed-length header followed by one or more variable-length records. Each of the variable-length records includes a record-header component and a record-contents component.
Because the world is much more complex than can be represented in a computer, all geospatial data are incomplete approximations of the world. [9] Thus, most geospatial data models encode some form of strategy for collecting a finite sample of an often infinite domain, and a structure to organize the sample in such a way as to enable interpolation of the nature of the unsampled portion.
Full geometry and attribute editing; OpenGIS SFS compliant; Geometry algorithms based on Java Topology Suite; Many third party plugins exist (e.g. connecting to Postgis, Oracle database or ArcSDE, print, reproject vectos, etc.) Supports standards like WMS, WFS and SLD; Easily extensible GIS programming environment for own GIS-applications