The output raster remains unchanged and resembles the initial LULC map

Software Support
1

I encountered an issue while running the Coastal Blue Carbon model. The spatial distribution of coastal habitat LULC in the input rasters for 2009 and 2024 is different due to transitions such as reclamation and other changes. However, when I ran the model, the output raster remained the same in distribution as the 2009 map, even though there were significant LULC changes by 2024.
How could this happen? And could you help me solve this issue?

2

Welcome to the forum @Raid!

Which output raster remains the same? Do they have exactly the same values for both 2009 and 2024, or just the same pattern, but with different values per pixel?

~ Stacie

3

The output displays the same spatial pattern as in 2009, but with different raster values. Could this be because the value I entered for soil-high-impact-disturb, following the guideline recommendation, was less than 1—thus allowing some carbon to remain stored in the sediment? However, my intention was to assume a 100% carbon loss due to reclamation for industrial development, such as the construction of jetties and shipyards within the observation area.

4

I have another question. Does the Coastal Blue Carbon model in InVEST not include an output report (HTML) like the one generated by the Carbon Storage and Sequestration model?

5

Hi @Raid -

Is “the output” you’re referring to carbon-stock-at-[year][Suffix].tif or a different model result? And how are the values different? Higher, lower, something else? Please be specific, else it’s hard to comment on the values you’re seeing, and how they may be impacted by disturbance.

No, Blue Carbon does not provide an HTML report. But you can generate those values easily by summing the model output results that you’re interested in within your area of interest.

~ Stacie

6

I input three LULC maps: 2009, 2024, and 2044 (the latter being a simulation result). However, the decrease in carbon storage only appears in the year 2044, even though in 2024 there is a loss of seagrass areas. Surprisingly, the carbon value in 2024 increased instead of decreasing.