Habitat Risk Assessment in Scenarios

Software Support
1

Hi.
I am Mohsen Japelaghi. I am a Ph.D student. I’m using HRA in my dissertation.
I have determined 2 scenarios in habitat risk assessment.

  1. Present state with current stressors.
  2. Future state with current and planned human-made stressors.
    in future state much more stressors will affect habitats vs current state, but results show that TOTAL_RISK_ECOSYSTEM in scenario 2 is less than first scenario while my assumption is that total risk ecosystem should be so more in second scenario. I am amazed. Can any one help me to notify is my results true?
    How should I interpret my results?
    Best Regards.
2

Hello @Mohsen ,

It is very possible that what you describe from scenario 2 is correct model behavior. The output TOTAL_RISK_Ecosystem.tif is not a simple sum of risk, it is normalized. If you’re looking for a sum of all of the risk across all stressors, you might want to look at TOTAL_RISK_<habitat>.tif, or a sum of those rasters. The user’s guide has more information about these outputs for reference: Habitat Risk Assessment — InVEST documentation

If it still seems like this is a bug, please be sure to share your model inputs for both scenarios with us so we can take a closer look.

Thanks,
James

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3

Hello James.
Thanks for quick reply.
In scenario 2 with much more stressors, total risk habitat in all habitats is less than scenario 1!!!
Is it true?
How should I interpret this result?
When TOTAL RISK habitat shows cumulative risk, therefore increasing of stressors should lead to more habitat risk while my results doesn’t show this.

4

It really depends on the details of your inputs, so I can’t say for sure if this behavior is expected. Would you please share your complete set of inputs here so we can take a closer look?

Thanks,
James

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5

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