GSS293 Vector and Raster Query Analysis

Flashcards covering key concepts from GSS293 Vector and Raster Query Analysis lecture notes.

Measurements in GIS

Fast, reliable, and accurate measurements using GIS tools and digital databases.

Metric

A rule for determining distance from coordinates.

Pythagorean metric

Gives the straight-line distance between two points on a flat plane (a2+b2=c2).

Thiessen Polygon

An interpolation method that creates polygons closest to the target feature class.

Thiessen Tool

The application of determining service area for shops through proportional division and distribution of point coverage into regions.

Queries

Search or browse the database and retrieve data; consists of Attribute and Spatial Data Query.

Attribute Data Query

Questions about the attributes of objects using SQL (Structured Query Language).

Query Expressions

Consists of Logical Operators (=, >,

Spatial Data Query

Questions involving the location of objects, often with three parameters: target object, neighborhood, and mathematical function.

Reclassification

Process of identifying a set of objects belonging to a group and transforming attribute information associated with a single map coverage.

Generalization

Process of making classification less detailed by combining classes.

Proximity Analysis

Determine the proximity of spatial features within or between classes

Near Tool

Computes the distance from each point in the input feature class to the nearest point or polyline in the near feature class within the maximum search radius.

Point Distance Tool

Computes the distances between point features in one feature class to all points in a second feature class within a specified search radius.

Buffering

Used to identify a zone of interest around point, line, or polygon features.