Fig. 1

Left panel A map of the area covered by the testline flight. The planned flightpath is shown in red and the dotted box shows the zoomed section shown in the right panel. In particular note the various crossings with roads and settlements, as these are a potential cause for outlying data points. Right panel A zoomed-in section of the test line showing data which were obtained for individual flights. Data points marked in red were removed from the analysis as they were too far away from other flights to allow for repeatability testing. Irish NG X and Y refer to the Irish National Grid x and y coordinate respectively. (Copyright OSI, Licence Number: EN 0047209)