# GIS CHPT 3

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1. Arc
A line connected to two end points.
2. Area
A spatial feature that is represented by a series of lines and has the geometric properties of size and perimeter. Also called polygon, face, or zone.
3. Area definition
A topological relationship used in ESRI's coverage model, which stipulates that an area is defined by a series of connected arcs.
4. Connectivity
A topological relationship used in ESRI's coverage model, which stipulates that arcs connect to each other at nodes.
5. Contiguity
A topological vector data format used in ESRI products.
6. Coverage
A topological vector data format used in ESRI products.
7. Delaunay triangulation
A iterative process of connecting points with their two nearest neighbors to form triangles as equiangular as possible in a triangulated irregular network (TIN).
8. Event
An attribute that can be associated and displayed with a route.
9. Georelational data model
A GIS data model that stores spatial data and attribute data in two separate but related file systems.
10. Graph theory
A subfield of mathematics that uses diagrams or graphs to study the arrangements of objects and the relationships between objects.
11. Line
A spatial feature that is represented by a series of points and has the geometric properities of location and length. Also called arc, edge, link, or chain.
12. Node
The beginning or end point of a line.
13. Point
A spatial feature that is represented by a pair of coordinates and has only the geometric property of location. Also called node or vertex.
14. Route
A linear feature that allows linear measures to be used on a projected coordinate system.
15. Section
A part of a route that refers directly to the underlying arcs and positions along arcs.
16. Shapefile
A nontopological vector data format used in ESRI products.
17. Topology
A subfield of mathematics that studies properties of geometric objects, which remain invariant under certain transformations such as bending or stretching.
18. Triangulated irregualar network (TIN)
A vector data model that approximates the terrain with a set of nonoverlapping triangles.
19. Vector data model
A data model that uses points and their x, y-coordinates to construct spatial features.
 Author: jess3c ID: 15980 Card Set: GIS CHPT 3 Updated: 2010-04-24 20:56:51 Tags: Vocabulary Folders: Description: Vocabulary Show Answers: