Developing Sub-models in Land Change Modeler (LCM)
You can only have 9 transitions in a sub-model. Although this is a hard limitation, when there are more than 9 it can be difficult to say that all transitions can be explained by the exact same drivers of change. To get around this limitation and to develop a more realistic model of historical change, create additional sub-models with similar, but different drivers. Here are the steps to do this.
1. Identify which transitions can be explained by the same drivers. If, for example, you have 3 sets of transitions, you would create 3 sub-model names in the first panel (Transitions Sub-Models: Status) by selecting each of your 18 transitions and assigning them a name in the Sub-Model Name entry box.
In the above example, you may have three transitions to model, deforest, urban, grassland. For each transition pair, enter one of these three sub-model names.
2. In the Transition Sub-model Structure panel, enter the drivers for the sub-model selected. You select the sub-model in the first panel using the drop-down menu for "Sub-model to be Evaluated".
3. After identifying the drivers for the sub-model, create the transition potential map under the Run Transition Sub-Model panel.
4. Go through the process above for each sub-model. Using the above example, you would do this three times for each of your sub-models. Once you have each transitions potential map for each sub-model, then proceed to the prediction.
What this allows you to do is evaluate each sub-model separately. It sounds complicated at first, but in the long run it reduces the complexity of developing a model of change. In the example above with 18 transitions, you need to think through carefully which transitions to group based on determinants of change.
Thank you, but is there any need for additional legend below the change map (to explain the clors for instance) as produced by the modeler: Example below.
I have a problem! When I choose to work with the nine transition classes. And later, I go to the Run transition sub-model menu and ask to create the potential transition files, the program is not generating all the possible transitions archives. A message like: Map 1_5 not found appears. And consequently, I can not go forward in the generation of future scenarios. What should I do to be able to generate all possible transitions files for each sub-model?
i want to generate two comparisons maps in LCM, the problem is that i don´t habe a background or 0 class value for create de news ID in harmonize legends step. it is posible to not modify the original legends?
Hi, I have the following doubt: what if I can not enter the drives for the sub model, since I do not have them? In what would change the results?