Carbon Storage and Sequestration model - Annual Price Change (VALUE)

Software Support
1

Hello, I am using the InVEST Carbon Storage and Sequestration model and I have a question about the Annual Price Change parameter.

The user guide mentions that this rate can be positive or negative, depending on the interpretation:

positive → if carbon sequestered today is considered more valuable than in the future;

negative → if carbon sequestered in the future is considered more valuable than today.

However, in the InVEST 3.16.2 graphical interface, the field only accepts values between 0 and 100. When I try to enter –1, I get the error message: “Value –1.0 is not in the range [0, 100]”.

My questions are:

Does the model actually accept negative values for Annual Price Change (perhaps only via code/Python)?

Or has the implementation changed, and now InVEST only allows positive values?

I would like to confirm this, since I want to simulate scenarios where the price of carbon increases in the future (i.e., future tons are worth more than today).

Thanks.

2

Thanks for pointing this out. Yes, the workbench should allow you to enter negative values, and this will be fixed in the next release. In the meantime, you could run the model via a python script to get around the issue.