This is an old revision of the document!
Perform Kriging on a scenario
Given the values of a number of discrete, individual locations, the Kriging algorithm interpolates the value of each location in a region containing these input locations. Due to resource constraints (e.g. number of responders), it is not realistic to collect a sample from every person who was potentially radiated and needs treatment in the region where the nuclear scenario occurred. Therefore, the Kriging result of a scenario illustrates a fast estimation on the impact of the nuclear event, computationally inferred from the small number of samples.
To perform Kriging on a scenario, after displaying its sample locations on a map (see the previous section), first select the dose version (i.e. the combination of a curve and an image selection model) you want to use for each sample set in the 'Sample locations' pane, then click the ‘Perform Kriging’ menu item under the ‘Geoprocessing’ menu. If it is the first time to perform Kriging on this dose version of this scenario (i.e. this combination of dose versions of the contained sample sets), a progress dialog will appear.
The following figure shows that the Kriging result will be displayed on the map using the colors (i.e. dose ranges) in the legend, and a Kriging pane will appear in the botton-right control. Checking the 'Kriging result' checkbox will display the filled areas with different dose ranges on the map; checking the 'show contours' checkbox will display the contours of these areas on the map. Thus using these two checkboxes, you can achieve four different views of the Kriging layer, i.e. displaying both the filled areas and contours (the default), either one of them, or neither (see the following three figures).
Since a sample set can have multiple dose versions under different curves/image selection models, a scenario can have multiple Kriging results between which the dose version of at least one sample set differs. The drop-down list in the Kriging pane contains all Kriging results that have been produced for the scenario. Selecting another item in this drop-down list will result in the display of the corresponding Kriging result on the map.
