Figure 4 : Measurement positions of the drift indicated by the blue colored dots and the satellite altimetry indicated by the gray colored dots.

From: Assimilation of the seabird and ship drift data in the north-eastern sea of Japan into an operational ocean nowcast/forecast system

Figure 4

(a) The seabird drift and satellite altimetry in the 2010 season, (b) in the 2011 season, and (c) the ship drift and satellite altimetry in the 2011 season. Contours with red color indicate iso-depth lines with 400 m, 800 m, and 1500 m levels. Numerics at the top of the figure denote the period. These figures were created by using the Grid Analysis and Display System (GrADS) Version 2.0.