Map layer parameters are selected independently

[eatyourgreens]

https://jamaica.infrastructureresilience.org/exposure?lat=17.87511&lon=-77.24007&zoom=12.78&assets=true&hazards=true&buildings=true&regions=false&terrestrial=false&marine=false

Hazard layer parameters (and parameters for other layers too) are stored independently, so I can select river flooding for 2050, but surface flooding for 2080 and cyclones for the present day. I'm not sure if this is a bug as such, but I think that I'd expect epoch to be set globally for all layers, when I change it for one layer. Otherwise, I have to go through all my currently selected layers and change the epoch for each one, if I want to see exposure for 2050, say.

[eatyourgreens]

Each of the hazard options has a different list of epochs, so one global epoch variable might not work after all.

eg.

• fluvial: https://github.com/nismod/irv-jamaica/blob/1fbf59b5db30ad9c676d41efae26197db86bf806/frontend/src/config/data-layers/hazards/domains.ts#L16
• coastal: https://github.com/nismod/irv-jamaica/blob/1fbf59b5db30ad9c676d41efae26197db86bf806/frontend/src/config/data-layers/hazards/domains.ts#L58

[eatyourgreens]

I'm ignoring hazard parameters in the URL for the time being. URLs record the selected hazard, but layer parameters are set to the defaults.