gmt-fork/doc/rst/source/coast_notes.rst_

Bugs
----

The options to fill (**-C** **-G** **-S**) may not always work if the
Azimuthal equidistant projection is chosen (**-Je**\|\ **E**). If the
antipole of the projection is in the oceans it will most likely work. If
not, try to avoid using projection center coordinates that are even
multiples of the coastline bin size (1, 2, 5, 10, and 20 degrees for
**f**, **h**, **i**, **l**, **c**, respectively). This projection is not
supported for clipping.

The political borders are for the most part 1970s-style but have been
updated to reflect more recent border rearrangements in Europe and
elsewhere. Let us know if you find something out of date.

The full-resolution coastlines are also from a digitizing effort in the
1970-80s and it is difficult to assess the accuracy. Users who zoom in
close enough may find that the GSHHG coastline is not matching other
data, e.g., satellite images, more recent coastline data, etc. We are
aware of such mismatches but cannot undertake band-aid solutions each
time this occurs.

Some users will not be satisfied with what they find for
the Antarctic shoreline. In Antarctica, the boundary between ice and
ocean varies seasonally and inter-annually. There are some areas of
permanent shelf ice. In addition to these time-varying ice-ocean
boundaries, there are also shelf ice grounding lines where ice goes from
floating on the sea to sitting on land, and lines delimiting areas of
rock outcrop. For consistency's sake, we have used the World Vector
Shoreline throughout the world, as described in :doc:`/datasets/gshhg`.
Users who need specific boundaries in Antarctica
should get the Antarctic Digital Database, prepared by the British
Antarctic Survey, Scott Polar Research Institute, World Conservation
Monitoring Centre, under the auspices of the Scientific Committee on
Antarctic Research. This data base contains various kinds of limiting
lines for Antarctica and is available on CD-ROM. It is published by the
Scientific Committee on Antarctic Research, Scott Polar Research
Institute, Lensfield Road, Cambridge CB2 1ER, United Kingdom.