For example, the MASIE-NH coastline has slight differences with the Arctic coastline available from the Toolik-Arctic Geobotanical Atlas (http://www.arcticatlas.org/maps/themes/cp/cpcoast). The differences are most apparent on the north east coast of Greenland.

There are numerous images and maps of coastlines available from various sources and many data sets at NSIDC, such as MASIE-NH, also have their own land, ice and ocean masks. Overall, at large scales, coastlines from different sources agree with each other (Figure 1). However, please be aware that at smaller scales (a few km) there can be some slight disagreements in certain areas of coastline (Figure 2). None of the coastlines seem to match each other exactly for the entire coastline. These small variations could be due to different spatial resolutions, how and when the image/map was generated and what data the images/maps are based on.