A Geo Data Combiner is a data set where the value at each location is calculated
by applying a function to one or more child geo data providers of the same type.
You can use combiners to apply various functions to your data, such as "Add", "Subtract",
"Max", "Min" and so on. The set of functions is different for combiners of each
Geo Data
type.
Example
We will now show how to use a distance combiner to add per-clutter type height adjustments
to a source of terrain data. This example assumes that you have the
US Data
Module installed.
You first need to locate the
Distance Geo Data
collection. This can be reached from the menu option. When you have opened this, click the
Add button and select "Combiner" from the pulldown list:
The function that will be applied wis stored in the
Operation property; for this example this should be set to "Sum". The
set of child geo data providers that the combiner will operate on is stored in the
List property. Clicking the
... button opens a new collection editor for the child geo data providers:
Click the Add button and select "Terrain (Data
Manager)" to add terrain data from the
US Data
(see
here
for more information), then click the Add button
again and select "Distance from Categories"; this will act as our source of per-clutter
type height values.
We now need to configure the per-clutter type height values. We need to add a clutter
provider; we can do this by selecting the Categories
Provider property of the "Distance from Categories" component, and then
choosing the Edit List option. This opens the
Categorical Geo Data
collection:
Click the Add button and then choose "Us National
Land Cover Database" from the pulldown list. This add the clutter data provider
from the US Data (see
here
for more information). Now click the OK button
to return to the "Distance from Categories" component.
We now need to provide the per-clutter type height offsets. Select the
Overrides property and click the ...
button to open the editor:
Enter the values for the Developed categories as above, then click
OK to return to the "Distance from Categories" component. This is now
ready to use; click OK to return to the
Distance
geo data collection, and OK again to return
to the main screen.
The whole process looks something like this:
