Step Increment/decrement - LULC model - Step 10 - Functor Edition FOR

[Jean Campos]

Greetings,
I am working with two maps: 2013 and 2023, and I am simulating changes for the years 2030, 2040, 2050 and 2060. In step 10 of the land use and land cover model in DINAMICA EGO, in Functor Editor FOR, I enter the following information: First Iteration Step: 2024; Last Iteration Step: 2060; Step Increment: 1. I used several values in Step Increment: 1, 2, 5, 10 and the results were different in each of them for the years 2030, 2040, 2050 and 2060. I'm not sure which step increment to use. In the visualization, step increment 5 seems more appropriate. Has anyone had the same experience?

[Hermann Oliveira Rodrigues]

Hi,

Think of the time specification as a convenience rather than a strict yearly reference. You can replace the For with a Repeat and define the total number of steps without mentioning years explicitly.

When you adjust the Step Increment, you’re actually changing the number of time steps assumed between the first and last iteration steps. For example:

- If First Iteration Step = 2024, Last Iteration Step = 2060, and Step Increment = 1, you have 37 time steps (2024 to 2060, inclusive).
   
- If you change Step Increment to 3, then you only have 13 time steps (2024, 2027, 2030, etc.).

The concept of years is just a construct to make calibration easier to understand—it doesn’t affect the underlying analysis. What truly matters is the total number of time steps used in the model.

To directly answer your question: Use Step Increment = 1, because increasing it only reduces the number of steps in your simulation, effectively altering the temporal resolution rather than improving the accuracy.

Best,
Hermann

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