GIS Quiz 7

Primary Data

Data collected directly from the real world (e.g., GPS, surveys).

Secondary Data

Data collected by others and reused (e.g., census data).

Geocoding

Converting street addresses into geographic coordinates.

Street Network Layer

A GIS layer containing street segments with address ranges.

GPS (Global Positioning System)

A satellite-based system for determining precise locations.

Satellite Constellation

The network of satellites used for GPS.

Triangulation

The process of determining location using multiple satellites.

U.S. Census Bureau

A federal agency that collects population and geographic data.

Census Geographies

The hierarchical system of geographic areas used by the U.S. Census (e.g., tracts, blocks).

Shapefile

A GIS file format used to store spatial features.

Positional Accuracy

The degree to which data is correctly located.

Topological Consistency

Ensures logical spatial relationships between features.

Attribute Accuracy

Ensures the correctness of non-spatial data.

Completeness

Measures whether all necessary data is present.

Null Value

A missing or unknown value in a dataset.

Metadata

Information about a dataset (e.g., source, accuracy, resolution).

Resolution

The level of detail in a dataset.

Logical Consistency

The internal correctness of a dataset.

Data Lineage

The history of a dataset, including its sources and modifications.