OBJECT-BASED VECTOR DATA MODEL - VISUAL BASIC
The "Basic" part refers to the BASIC (Beginners All-Purpose Symbolic Instruction Code) language.
Visual Basic evolved from the original BASIC language ...
Explaining how 3 Dimensional Data is stored in GIS using Raster and Vector Data Models
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This tutorial will help the user understand the conceptual details concerning the storage methods of 3D data in GIS using the Raster vs. Vector models.
Vector data model: Divides space into discrete features, usually points, lines or polygons.
Dept. of English & Creative Writing, Bowland College, Lancaster University, Lancaster, LA1 4YT ...
Vector data model
based on vectors (as opposed to space-occupancy raster structures)
fundamental primitive is a point ...
See Also: vector data model
[data models] A representation of the world as a surface divided into a regular grid of cells.
If you consider the vector data model, every point has a coordinate; every line's nodes and vertices have coordinates; and every polygon's outlines have coordinates.
Method of determining spatial relationships in vector data models (tells computer what is inside or outside a polygon or which nodes are connected by arcs). Turns vector nodes, arcs, and polygons into intelligent maps.
There are advantages and disadvantages to using a raster or vector data model to represent reality.
The vector data model closely mimics the manual drafting process by representing map features (discrete spatial objects) as a set of lines which, in turn, are stores as a series of X,Y coordinates.
While CRM systems are usually based upon a vector data model, they often need to incorporate a number of raster data layers into the database, ...
First theoretic results in the creation of 3D vector data models, first practical results in voxel models for local mining systems;
Theoretical foundation of the quadtree (octree) indexing schemas; ...
For example, the vector data model does not handle continuous data, e.g. elevation, very well while the raster data model is more ideally suited for this type of analysis. Accordingly, the raster structure does not handle linear data analysis, e.g.
Refer to Vector data processing in GRASS GIS for more information on Grass GIS vector data model.
NOTES
v.build creates support files only for binary vector files located in the user's current mapset.
LABEL
An ALPHANUMERIC element, used with the VECTOR DATA MODEL, that displays attribute values or identifiers for points, lines, or polygons.
LAND COVER
The surface materials, such as crops and water, that are found in an area.
A commercial PC-based GIS. The software package uses the vector data model and is primarily intended for business applications.
Attributes ...
Service, a type of raster data service referred to as a "coverage" that is more or less a subset of WMS for data delivery instead of map pictures.) The OCG "coverage" should not be confused with the traditional ArcInfo Coverage vector data model that ...
Images, processed by other professional GIS software (e.g. vector-based Arc/Info) will be used as images and slide shows, e.g. to show essential differences in using vector data models or raster data models.
 See also: Vector Data, Model, GIS, Data Model, Vector
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