Hi @MegC, Thinking it through a bit more, there are a few challenges with breaking up an analysis into multiple AOIs and then getting results that can be compared from one AOI to the next.
Equation 1 is the final index equation (http://releases.naturalcapitalproject.org/invest-userguide/latest/coastal_vulnerability.html#exposure-index). In order to compare the final Exposure Index from a point in AOI_1 with a point in AOI_2, all the
R_ terms data from both areas must be included the calcuation. Those
R_ data are in the
coastal_exposure.gpkg output. So one could combine the tables of multiple
coastal_exposure.gpkg outputs and then recalculate the Exposure Index.
But before that, some of those
R_ terms are relative rankings themselves. In other words, in order for an
R_relief value from AOI_1 to be comparable to an
R_relief from AOI_2, all of the relief data from both areas must be included in the “ranking” of
R_relief. Those intermediate relief values are in
intermediate_exposure.gpkg. And the same applies to
R_surge, R_wind, R_wave. Table 4.1 shows how the
R_ values are assigned for each of these variables - basically just splitting the raw values into 5 quantile groups.
So that’s kind of a lot of work, but this sort of thing has been done before. For example, another use-case for re-calculating the final exposure index is to compare values across different scenarios within the same AOI.