GIS Dictionary

[data editing] In ArcGIS, a part of the topology validation process in which vertices are created at the intersection of feature edges.

1 [surveying] A special-case, least-squares-based method for adjusting the closure error in a traverse. The Crandall rule is most frequently used in a closed traverse that represents a parcel from … Read more

[ESRI software] In Survey Analyst for field measurements, an attribute of the computation that records the date of origin.

[ESRI software] In Survey Analyst for field measurements, an attribute of the computation that records the date of origin.

[ESRI software] The time it takes to initialize an instance of a server object when server objects are created in the GIS server either as a result of the server … Read more

[spatial statistics use for geostatistics] The specific cutoff point that determines acceptance or rejection of a hypothesis. Critical values are determined by the choice of a level of significance ().

[printing] Marks that indicate the edge of the page of a finished, printed map. Cropmarks are used as a reference for trimming excess paper after printing.

[spatial statistics use for geostatistics] Statistical correlation between spatial random variables of different types, attributes, names, and so on, where the correlation depends on the distance or direction that separates … Read more

[statistics] The statistical tendency of variables of different types, attributes, names, and so on, to vary in ways that are related to each other. Positive cross covariance occurs when both … Read more

1 [data analysis] In a GIS, comparing attributes in different coverages or map layers according to location. 2 [statistics] A method for showing the relationship between two or more data … Read more

[statistics] A procedure for testing the quality of a predicted data distribution. In cross validation, a piece of data whose value is known independently is removed from the dataset and … Read more

[spatial statistics use for geostatistics] A function of the distance and direction separating two locations, used to quantify cross correlation. The cross variogram is defined as the variance of the … Read more

[ESRI software] A database containing tables with information defining the mapping between a data source schema and an output geodatabase schema. Cross-reference databases are used by the PLTS data loader … Read more

[ESRI software] A technique for indexing features that cross tile boundaries in a map library by storing them as one or more features in each tile, instead of storing them … Read more