Figure 3
From: Assessing cetacean surveys throughout the Mediterranean Sea: a gap analysis in environmental space
Geographic coverage of effort for: (a) all surveys, (b) aerial surveys only and (c) shipboard surveys only. Effort was aggregated on a 20 × 20 km grid for visualization (10 × 10 km cells used for the analysis were too small to be visible on a map of the entire Mediterranean Sea). The colour scale represents effort in km per 20 × 20 km grid cell and is the same for all three maps. Blank cells represent zero effort. The maps were generated with R (https://www.r-project.org/) (version 3.1.1).
