Map Accuracy and Error

Map error is the difference between the true location of a feature on the ground and its location on a map.

Natural error is not a source of map error. Map errors are caused by human error, instrument error, or data error.

Positional error is the most common type of map error. It occurs when the location of a feature on a map is not accurate.

Map accuracy assessment is the process of determining the accuracy of a map.

Photogrammetry is not a method used to assess map accuracy. Ground truthing, remote sensing, and GPS surveying are all methods used to assess map accuracy.

Map accuracy is the degree to which a map is accurate.

Map scale is not a factor that affects map accuracy. Map projection, data quality, and mapmaker skill are all factors that affect map accuracy.

Map revision is the process of improving the accuracy of a map.

Changing the map scale is not a method used to revise a map. Adding new data, correcting errors, and updating the map projection are all methods used to revise a map.

Map compilation is the process of creating a new map.

Map printing is not a step in the map compilation process. Data collection, data processing, and map design are all steps in the map compilation process.

Map transformation is the process of transferring data from one map to another.

Rubber sheeting is not a method used to transform a map. Affine transformation, projective transformation, and Helmert transformation are all methods used to transform a map.

Map digitization is the process of converting a map from analog to digital format.

Heads-up digitizing is not a method used to digitize a map. Manual digitizing, semi-automatic digitizing, and automatic digitizing are all methods used to digitize a map.