Seabed area estimation – an example in Subarea 48.6

Estimating planimetric seabed area (i.e., the area between two isobaths) is a common task in CCAMLR works (e.g., in the Trend Analysis). The R script linked below provides an example in which seabed area is estimated for the entire Subarea 48.6 and its Research Blocks (Fig. 1).

Download R script

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Figure 1. Map of Subarea 48.6 and its Research Blocks (Source). The “fishable area” (seabed area between 600 and 1800m) is shaded in green.

Steps

1. Create a folder, a new R project in that folder, and put the R script in that folder,

2. Download the un-projected bathymetry from here (link to come) and put it in that folder,

3. Run the script. A csv file should have been created in your folder (Table 1).

Table 1. Seabed area (km$^2$) between 600 and 1800m (referred to as “Fishable area”) in Subarea 48.6 and its Research Blocks.

GAR_Long_Label	Fishable_area
48.6	80964.82
48.6_2	9330.55
48.6_3	943.37
48.6_4	10511.03
48.6_5	8390.91