16 Strata gallery

This packages comes with several built-in datasets of geographic strata that are commonly used in NOAA/NMFS surveys. The functions strata_explore() and strata_select() were developed to help you explore those built-in options.

Central North Pacific

strata_explore('cnp')

To acquire the filepath to one of these strata, pass the index (or indices) printed in the map titles above to the function strata_select():

strata <- strata_select(selections = c(2,3),
                              region = 'cnp')

This function returns a named list that can be passed directly to the strata argument in load_settings().

strata %>% names
[1] "OtherCNP" "MHI"     

strata
$OtherCNP
   Lon   Lat
1 -131 40.00
2 -126 32.05
3 -120 25.00
4 -120 -5.00
5 -185 -5.00
6 -185 40.00
7 -131 40.00

$MHI
       Lon   Lat
1  -156.00 22.00
2  -154.40 20.60
3  -153.50 19.20
4  -154.35 18.55
5  -155.20 17.75
6  -157.00 18.25
7  -157.50 19.20
8  -161.00 21.84
9  -160.00 23.00
10 -157.00 22.50
11 -156.00 22.00

California Current

strata_explore('ccs')

ETP

You can do the same for the Eastern Tropical Pacific (ETP); there are about 70 polygons built-in to LTabundR for this region. We will just show a few of them here, using the start_at argument.

strata_explore('etp',
               start_at = 64)