With the Uniform Interpolation Grid dialog window you may define the region to be kriged or interpolated as well as the intensity at which the interpolation is to take place. This method for specifying interpolate locations is appropriate for interpolations at regular intervals across an area; if the interpolations are to be performed at odd locations, use the NonUniform Interpolation Grid. If the outline of the area is a complex polygon you should still use this dialog but then specify the shape of the polygon from the Krig window. Note that for 1-dimensional data sets (e.g. transects or time series) only the X direction is displayed in the dialog window.
Specify the beginning and ending values for the region to be interpolated. The region may exceed the Data Range, which is noted on the right side of the dialog window. Irregularly-shaped areas within the bounds of the interpolation range may be interpolated by specifying polygon masks from the Krig window.
The number of decimal places used to define the range is limited to the number of decimal places specified for the given coordinate field in the Data Worksheet Window. Changing the number of decimal places for a coordinate in the Data Worksheet Window changes the number of decimal places reported here. Changing the range will change the Number of points value.
Note that interpolation will begin at the minimum X and Y values, but may not reach the maximum values if the total distance (e.g. the maximum X value less the minimum X value) is not evenly divisible by the distance interval. For example, interpolation of an X Range of 0 – 105 with a distance interval of 10 will stop interpolating at X = 100, prior to exceeding the maximum range of 105.
This is the range covered by the actual data set; these are read-only values, they cannot be changed by the user from this dialog window.
Specify the distance interval between locations within the interpolation range. A distance interval of 2.0 over a range of 0 to 10.0 means that interpolations will be made at points 0.0, 2.0, 4.0, 6.0, 8.0, and 10.0. Changing the distance interval will change the number of points value.
For any given range to be interpolated, the number of points will be the range divided by the distance interval plus 1. For a range of 0 to 10.0 with a distance interval of 2.0, the number of points will be [(10.0 – 0)/2.0]1 = 6 points at locations 0.0, 2.0, 4.0, 6.0, 8.0, and 10.0.
The Optimize command sets the number of points to 61 for both the X and Y directions (101 points for a single-dimension transect) and calculates the appropriate Distance Interval. The Interpolation Range is not affected.
The Reset command restores the default grid settings. The Interpolation Range is set to the Data Range, and the number of points is set to 61 for both the X and Y directions (101 points for a single-dimension transect).
OK/Cancel
Press OK to save changes and close the window; press Cancel to close the window without saving changes.