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# Relative Accuracy

Relative Accuracy
Relative accuracy refers to the relationship of one point in the database to another point in the same database. Contrast with absolute accuracy which refers to the relationship of a point in the database to its actual location on the globe.

relative accuracy
[accuracy] A measure of positional consistency between a data point and other, near data points. Relative accuracy compares the scaled distance of objects on a map with the same measured distance on the ground.

Relative Accuracy
Accuracy of these maps is determined by the mapmaker and the value of this accuracy is judged by the user of the map. For simple directions, a user may not value extreme accuracy. On the other hand, someone who is planning on setting a gas line will value accuracy.

relative accuracy The degree to which map features are shown with the correct distances and directions from each other.
RFP Request For Proposal is the term often used to describe government or organization solicitations of proposals from vendors and contractors.

The relative accuracy of height values resulting from the global-geopotential-model method are dependent on the grid spacing of the geopotential model used.

~ is a measure of the accuracy of individual features on a map when compared to other features on the same map. Absolute accuracy is a measure of the location of features on a map compared to their true position on the face of the Earth.

The grouping of observations into control and check points is useful for estimating the ~ of the geometric transformations. This measure of accuracy is relative to how well the distortions have been sampled while it also reflects the adequacy of the model for these points.

Different maps differ in the ~ of the depiction of the area, the shapes of objects, actual distances, and compass direction. Maps that accurately relect area are often called equal-area maps (an example is the Albers equal-area conic map).

DOP: Dilution of Precision is a term used to describe the ~ of a GPS position.
When satellites are spread across the sky far from each other, the triangulation calculations result in precise locations.

Without an understanding of the ~ and interpolation error of the base maps, one cannot be sure of the recommendations and decisions derived from the interpolated data.

When data is captured, the user should consider if the data should be captured with either a ~ or absolute accuracy, since this could not only influence how information will be interpreted but also the cost of data capture.

Refers to the position of an object position in relation to a control survey network. (See also Accuracy and Compare with ~.)
Absolute Coordinate
Coordinate in a unified reference system expressed in the geographic or the X,Y,Z geocentric system.

The quality of a DEM is a measure of how accurate elevation is at each pixel (absolute accuracy) and how accurately is the morphology presented (~). Several factors play an important role for quality of DEM-derived products: ...

A measure of the geometric quality of a GPS satellite configuration in the sky. HDOP is a factor in determining the ~ of a horizontal position. The smaller the DOP number, the better the geometry. [Category=Geospatial ] ...

According to the information provided by NIMA, the model has the absolute accuracy of 30m, while the ~ is better than 20m. To achieve the goal of homogeneous accuracy in Hungary, the coverage of [43,5° j 51° and 13°l25°] was used from the global model.

Land base that supports a management system, land use and/or infrastructure master plans, or environmental impact assessments. A recommended standard in this case would be all control points having an absolute accuracy of 5 feet or better and all referenced points having a ~ of 20 ...

See also: What is the meaning of Accuracy, Location, Information, Surface, Geographic?

 Topic: GIS © MiMi