GIS Quiz 8

Query

A request to extract data based on attribute or spatial conditions.

Multi-Clause Query

A query with multiple conditions (e.g., 'Population > 1M AND Median Income > $50K').

Attribute Query

A query selecting features based on their attribute values.

Spatial Query

A query selecting features based on their spatial relationships.

Clementini Operator

A spatial query method that excludes boundary-touching features.

Spatial Join

A method to combine attributes from different layers based on spatial relationships.

Inside Join

A join that assigns attributes from one feature to another if it is entirely inside it.

Distance Join

A join that assigns attributes based on the closest feature.

Cardinality

The relationship between records in a join (e.g., One-to-One, One-to-Many).

Summarized Join

A spatial join that aggregates multiple matches into summary statistics.

Intersects

A spatial relationship where features overlap in any way.

Touches

A spatial relationship where features share a boundary but don’t overlap.

Contains

A spatial relationship where one feature fully encloses another.

Within

A spatial relationship where one feature is fully enclosed by another.

Overlaps

A spatial relationship where features share part but not all of their area.

Equals

A spatial relationship where two features are identical.

Crosses

A spatial relationship where one feature partially overlaps another.

Kernel Density Estimation (KDE)

A technique for creating density maps.

Hot Spot Analysis

A statistical method to detect clusters of high or low values.

Getis-Ord Gi*

A statistic used in hot spot analysis to determine significant clustering.

Map Units

The measurement units used in a GIS dataset (e.g., meters, decimal degrees).

Attribute Table

A table containing data about spatial features.

Reprojection

Changing the coordinate system of a dataset.

Geographic Coordinate System (GCS)

A coordinate system based on latitude and longitude.