4 Spatial Data Models and Quality Free Online FlashCards

What two things do geospatial data represent?

Geospatial data represent both where something is and what it is.

How do vector data represent geographic features?

Vector data represent discrete features as points, lines, and polygons.

What role do attributes play in a vector dataset?

Attributes are descriptive values linked to vector geometry and commonly stored in a table, such as a road’s name or speed limit.

How do raster data represent a region?

Raster data divide a region into a regular grid of cells, each storing one or more values.

When are raster data useful compared with vector data?

Raster data are common for continuous surfaces and imagery; vector data are often convenient for distinct, bounded features.

What is the trade-off of using smaller raster cells?

Smaller raster cells usually capture finer spatial detail but require more storage.

Does a smaller raster cell size guarantee accurate data?

No. Smaller cells can represent finer detail, but cell size alone does not guarantee accurate values.

How does a data model differ from a file format?

A data model describes how spatial information is organized; a file format is a particular way to store or exchange it.

Which formats are examples for vector and raster data?

GeoPackage and GeoJSON are examples for vector data; GeoTIFF is used for georeferenced raster data.

Name two constraints to keep in mind when using a Shapefile.

A Shapefile layer supports one geometry type, and its data may be distributed across several related files.

What does positional accuracy measure?

Positional accuracy describes how closely mapped locations match their real-world positions.

What does attribute accuracy assess?

Attribute accuracy concerns whether recorded descriptions and measurements are correct.