I am confused about how to calculate the NPV raster for coastal Blue Carbon. Should I directly sum all the values, or should I multiply each pixel by its area in hectares?
Thanks
Hello @Raid,
Could you say more about what you are trying to calculate, and from which of the model outputs? Are you trying to create a net present value for the entire raster? Or something else?
In case it’s helpful, the InVEST Coastal Blue Carbon model already calculates per-pixel net present value based on the pricing table you provide as an input, which can be found in the model’s workspace in the output folder. as net-present-value-at-<year>.tif, which is represented in currency per hectare.
James
My analysis in Coastal Blue Carbon valuation is as follows:
I input LULC data from 2009, 2014, 2019, 2024, … up to 2044. The final output I focused on is the Net Present Value (NPV) for the years 2024 and 2044.
I have two questions:
- Does the NPV for 2024 represent the carbon sequestration that occurred from 2009 to 2024? And does the NPV for 2044 represent the sequestration from 2009 to 2044?
- How can I calculate the carbon sequestration (Ton Carbon) that occurred between 2009 and 2024, and then from 2024 to 2044 separately?
Does the NPV for 2024 represent the carbon sequestration that occurred from 2009 to 2024? And does the NPV for 2044 represent the sequestration from 2009 to 2044?
The User Guide has a Valuation section that describes the calculations that are done for NPV. According to the description of equation 14, yes, you’re correct about what the NPV outputs represent.
How can I calculate the carbon sequestration (Ton Carbon) that occurred between 2009 and 2024, and then from 2024 to 2044 separately?
The model provides outputs “carbon-stock-at-[snapshot year].tif”, and you could take the difference between the 2009 and 2024 snapshots, and the 2024 and 2044 snapshots to get sequestration. That’s also what’s described in equation 14 for valuation.
~ Stacie