The interface for editing a point rule looks like this:
Specify Whether the Rule Is Used in the Inference
Check the box next to "will be in used" to make the rule be used in the inference. Uncheck the box to disable the rule.The rule is editable only when it is in use.
Specify Curve Type:
Select a curve type from the drop down list "Curve Type". The curve can be bell-shape, S-shape or Z-shape.
Edit the Rule
In the graphic area, the green curve is a graphic representation of the rule. There are some small square handles attached to the curve. The square handle on the top of the curve indicates the value at which the environmental variable is the most optimal for the soil type. The value is decided by the coordinates (central x, central y) of the central point. The two square handles on the sides of the curve indicate the values where optimality value is equal to 0.5. They are decided by left width and right width.
You can directly enter values for central x, central y, left width and right width in the text area to adjust the rule. When modifications are made, click on "Update Rule" button to submit. This will also cause the curve displayed in graphic area to change accordingly.
You can also use the mouse to adjust the rule in the graphic area in a click on-and-drag manner. For point rule, drag the handles for left and right width which are highlighted with right circles which will cause the values in the text area to change accordingly. It must be noted that the central point can only be modified by enter values in the text area.
Change Point Rule to Freehand Rule
Click on "Change to Freehand Rule" . Current point rule can be converted to freehand rule. You can edit the key points to edit the rule.
Set the Display Range of the Graphic Area
Display range decides the maximum range on the x-axis of the graph area. To set the display range, use the arrows at each end of the display range control bar.
On the left, click on "<" to decrease the low display limit, click on ">" to increase the low display limit.
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On the right, click on ">" to increase the high display limit, click on "<" to decrease the high display limit.
Current display range decides the range for the current x-axis in the graphic area. To set current displaying range,drag the handles on the display range control bar.
Select Attached Layer
If you attached a layer when creating the rule, the linked layer will be displayed.
Otherwise, the program will tell you "No data layer linked. Please set data layer".
You can attach a layer at any time by using the drop-down list. You have two options here:
1) choose one existing layer to attach.
2) choose one layer which is not in the GIS database. In this case, if the selected layer file is valid and the name of the layer is not any of these of the existing layers in GIS database, SoLIM will add the layer to GIS database, and the program will also show that the layer has already been attached with current rule. If the selected layer is valid, but there is already one layer with the same name in GIS database, the program will bring up a dialog to ask if you will replace existing layer with the new one. If you click on OK, it will replace the existing layer in the GIS Database, and the program will also show that the layer has already been attached with current rule.
If the selected layer is invalid, the program will pop up an error dialog.
Tip: A rule will take part in inference only if it is attached with a layer.
Apply the Rule to The Layer
If the rule has an attached layer, you can see the effect of applying the rule to the layer.