asam_subregions: Retrieve ASAM subregions polygons

In hrbrmstr/asam: Read and work with Anti-shipping Activity Messages (ASAM) database files

Description

Returns the official ASAM Subregions polygons as a SpatialPolygonsDataFrame or a simple features collection.

Usage

asam_subregions()

Details

There are 9 ASAM global regions and 52 ASAM global subregions. These are referenced in REGION and SUBREGION fields in the returned object.

What is a region/subregion? The world is divided into nine regions; each corresponding to the geographic limits of one of the nine regions in the National Imagery and Mapping Agency (NIMA) Catalog of Hydrographic Products.As shown in the graphic below, each Region is further divided into numbered Subregions. The first digit of all five-digit chart numbers indicates the geographic region while the first two digits of all five-digit chart numbers refer to the geographic subregion.

Examples

## Not run: 
plot(asam_subregions())

## End(Not run)

hrbrmstr/asam documentation built on Nov. 8, 2019, 8:57 a.m.