Simulate population using external spatial predictions

[AngeliaMiller]

• [x] Obtain population dynamic parameters for summer flounder
• [x] Insert external spatial predictions from sdmTMB from sseep-analysis repo into sim_distribution() and override this part of SimSurvey (hardwire distribution predictions from sdmTMB )

[AngeliaMiller]

Hi @gavinfay,

I've started working through attempting to hardwire a single year's distribution from summer flounder from sdmtmb in place of simulating a distribution from sim_distribution() in SimSurvey. The script can be found from commit 95d304f.

Based on reviewing the outputs from dummy data of sim_abundance and sim_distribution, I think my path forward, and referring to the script, is

• lines 49-73: simulate summer flounder abundance based on stock assessment values, sim_abundance()
• lines 74-80: append the output list from sim_abundance() with the sdmtmb grid as a raster
• lines 81-100: append the output list from sim_abundance() with an xy data.table from the raster grid extrapolated by the number of years and ages that are being simulated
• lines 101-102: append the output list from sim_abundance() with the sdmtmb distribution from one year.

However, in looking under the hood of sim_distribution.R in the SimSurvey repo, I can't quite decifer how to calculate the abundance as a function of age.

Let me know your thoughts, and if I need to pivot my thinking in another direction.

Thanks!

Data: sseep-sim-issue3.zip

[AngeliaMiller]

See commit 90785c1.