Lesson 2.2 On-screen Digitizing and Errors

The process of creating vector features by tracing features displayed on a computer screen

Another term for on-screen digitizing

The process of assigning real-world coordinates to each pixel of raster data

Points with known coordinates used to relate raster data to real-world locations

A digitizing function that allows features to connect to the nearest vertex or line segment

The distance within which a feature can snap to the nearest vertex or line segment

The distance used when searching for a vertex during vertex editing

A geometry type used to represent a location as a single point

A geometry type used to represent a linear feature

A geometry type used to represent an area with an enclosed boundary

Information that describes a geographic feature

A table containing information associated with geographic features

The required attribute information that should be recorded consistently for digitized features

The QGIS function used to put a layer into editing mode

The tool used to create a new geographic feature during digitizing

The relationship between the size of a feature on a map and its corresponding size on the ground

The spatial relationships among geographic features

The degree to which the mapped location of a feature agrees with its true location

The difference between the mapped location of a feature and its true or expected location

A measure used to evaluate the degree of inaccuracy in a digitized map

The correctness of information recorded in attribute fields

The accuracy related to the age or timeliness of a dataset

The date indicating when a dataset was created or released

The date and time when data were collected

The consistency and correctness of spatial relationships and data structure

The extent to which all required features and information are included in a dataset

The closeness of a measurement or mapped feature to its true value or location

The closeness of repeated measurements to one another

An error that occurs when a feature is digitized in the wrong location

An error that occurs when an attribute contains an incorrect or missing value

An error associated with outdated data

An error resulting from incorrect spatial relationships

An error that occurs when required features or information are missing