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Question on area codes #4

Closed kmaspelund closed 4 months ago

kmaspelund commented 5 months ago

Hi Min-Yang, I took a first look at the data. I want to understand these NAFO statistical area codes a little better. Three questions on that area coding:

  1. Is there a crosswalk/map/data file somewhere describing how the area codes match to the NAFO statistical areas (the area variable)? I know there's the lat-long points, so I can visualize it that way, but it would be good to get some outside source on them. I could only find pretty general maps from a quick perusal but thought I'd just ask.

  2. Similarly, are there shapefiles available of the access areas year to year (Closed Area 1, Elephant Trunk, etc.)? Should I ask Jonathon or Travis? I know there are plenty of maps in the NEFMC documents so it must exist somewhere. My first aim is to reverse-engineer where the access areas are by seeing where boats fish (in lat-long space) only when they are on access area trips (this is the accessarea variable right? And activity_code?), but it would be good to also just know what areas were labeled access areas year to year. I can overlay a shapefile myself.

  3. I know that we want to align our work with the GEO-SAMS model. What are the area designations used in GEO-SAMS? I think for a choice model of fishing location, it'd be best if we aim to match up to whatever areas (grids, some other regulatory areas, etc.) that GEO-SAMS will be based on.

Thanks so much as always! Karl

mle2718 commented 5 months ago

@kmaspelund

Is there a crosswalk/map/data file somewhere describing how the area codes ...

You are referring to the area column in cams_subtrip, right? If so, you can it get that here: https://www.fisheries.noaa.gov/resource/map/greater-atlantic-region-statistical-areas

Similarly, are there shapefiles available of the access areas year to year?...

Yes. We have the shapefiles of access areas through 2015. I have added to them to this repository in the /data/external/spatial folder. Get in touch with Travis at GARFO for 2016-2023 shapefiles. 4ac7cbf243ba76803c3d58fa24932bb636717d4c

It looks like accessarea has coded as "AA" for access area and "OPEN" for DAS fishing

The activity_code_1 and _2 can be parsed to figure out the fishery, and area. Take a look at https://github.com/NEFSC/READ-SSB-Lee-KA_Scallop/blob/main/documentation/external%20documentation/vms_declaration_code_glossary_may_2018.pdf. 2576150f22ffebd097a1b244f8deff3222fbce09

I know that we want to align our work with the GEO-SAMS model

Based on my admittedly hazy recollection, the GEO-SAMS grid was at a very fine spatial scale, something that was nearly continuous. I looked briefly at the https://github.com/NEFSC/READ-PDP-GeoSAMS and saw a total of 18,000 grid cells for the combined MA and GB stock areas. I will check with Dvora on this.

kmaspelund commented 5 months ago

Thanks, this is all perfect. And right, it does seem the GEO-SAMS grid is extremely spatially fine. Good to know, then I think starting with the area codes is probably fine, and if we adjust to something finer it still shouldn't cause too many hiccups with the GEO-SAMS model. I'll email Travis about the shapefiles. Thanks!!

mle2718 commented 4 months ago

closing this, @kmaspelund -- reopen if you are unsatisified.