The Spatial correlation operation be directly executed by typing one of the following expressions on the command line of the Main window:
OUTTABLE |
= |
TableSpatCorr(InputPointMap) |
OUTTABLE |
= |
TableSpatCorr(InputPointMap, LagSpacing) |
OUTTABLE |
= |
TableSpatCorr(InputPointMap, LagSpacing, Direction) |
OUTTABLE |
= |
TableSpatCorr(InputPointMap, LagSpacing, Direction, Tolerance) |
OUTTABLE |
= |
TableSpatCorr(InputPointMap, LagSpacing, Direction, Tolerance, Bandwidth) |
OUTTABLE |
= |
TableSpatCorr(InputPointMap, LagSpacing, plane | sphere) |
where:
OUTTABLE |
is the name of your output spatial correlation table. |
TableSpatCorr |
is the command to start the Spatial correlation operation. |
InputPointMap |
is the name of your input point map (value map). When you want to use a Class or ID point map with an attribute table linked to the map, you can use: InputPointMap.ColumnName |
LagSpacing |
is an optional parameter to specify the length in meters for the linear distance intervals that should be used. When this parameter is not used, logarithmic distance intervals will be calculated. |
Direction |
To use the 'bidirectional' method: an optional parameter to specify an angle in degrees for the direction in which point pairs should be found. Direction 0� is North; direction 90� is East. The direction is a clockwise angle from the Y-axis. 0� � direction � 90�. |
Tolerance |
is an optional parameter to specify half of the opening angle in degrees with which point pairs in a certain direction should be found. 0� < tolerance � 45�. |
Bandwidth |
is an optional parameter to specify half of the maximum width in meters within which point pairs within a certain angle and in a certain direction should be found. By specifying a band width, you will limit the opening angle to a certain width; the opening width with which point pairs can be found in a certain direction will never be broader than twice the specified band width. |
plane | sphere |
When using the 'omnidirectional' method: an optional parameter to calculate distances in a plane (plane), or on the sphere by using the projection of the coordinate system of the input point map (sphere). |
When the first formula is used, only spatial autocorrelation and spatial variance are calculated, i.e. no semi-variogram values. Furthermore, instead of linear distance classes, you will obtain a number of logarithmic distance classes.
When the definition symbol = is used, a dependent output table is created; when the assignment symbol := is used, the dependency link is immediately broken after the output table has been calculated.
See also: