limit : posint; specifies the maximum number of points that a WorldMap object is allowed to store. By default, the value of limit is 100.

The WorldMap command creates a WorldMap object that can be used to display maps of the world in various ways.

If no argument is specified, the command returns a WorldMap object with no point stored.

If a ref to the GeoNames dataset is given, the WorldMap object created loads all data points in ref.

If a nested list of points is given, the WorldMap object created stores all points in the nested list. Each sublist in points must be a list of at least two elements: the first being the longitude (x-coordinate in the Geographic projection) and the second being the latitude (y-coordinate in the Geographic projection). The optional third element is a string label for the point.

The longitude must lie in the interval [-180,180], and the latitude must lie in the interval [-90,90].

Note that the number of points in both ref and points cannot exceed limit.

Here is the list of commands defined for WorldMap objects:

The Project command, used to project longitude-latitude pairs to different projections, does not operate on a WorldMap object, unlike most other commands in the WorldMap package.

For a list of supported map projections, see the List of Projections help page.

$m≔\mathrm{DataSets}:-\mathrm{Builtin}:-\mathrm{WorldMap}\left(\right)$

$m≔\left(\begin{array}{cc}\left[\mathrm{PLOT}\left(\mathrm{...}\right)\right]& \begin{array}{c}\mathrm{A\; map\; of\; the\; world}\\ \mathrm{projection:\; MillerCylindrical}\end{array}\end{array}\right)$

$\mathrm{Display}\left(m\right)$

$\mathrm{m2}≔\mathrm{DataSets}:-\mathrm{Builtin}:-\mathrm{WorldMap}\left(\left[\left[121.5\,31.2\,''Shanghai''\right]\,\left[-123.1\,49.25\,''Vancouver''\right]\,\left[-118.25\,34.05\,''Los\; Angeles''\right]\right]\right)$

$\mathrm{m2}≔\left(\begin{array}{cc}\left[\mathrm{PLOT}\left(\mathrm{...}\right)\right]& \begin{array}{c}\mathrm{A\; map\; of\; the\; world\; with\; 3\; points}\\ \mathrm{projection:\; MillerCylindrical}\end{array}\end{array}\right)$

$\mathrm{Display}\left(\mathrm{m2}\right)$

$\mathrm{ref}≔\mathrm{DataSets}:-\mathrm{Builtin}:-\mathrm{Reference}\left(''Geonames''\right)\left[\left[\mathrm{Country}=''Canada''\,\mathrm{Name}=''Waterloo''\right]\right]$

$\mathrm{ref}≔\left[\right]$

$\mathrm{m3}≔\mathrm{DataSets}:-\mathrm{Builtin}:-\mathrm{WorldMap}\left(\mathrm{ref}\right)$

$\mathrm{m3}≔\left(\begin{array}{cc}\left[\mathrm{PLOT}\left(\mathrm{...}\right)\right]& \begin{array}{c}\mathrm{A\; map\; of\; the\; world\; with\; 3\; points}\\ \mathrm{projection:\; MillerCylindrical}\end{array}\end{array}\right)$

$\mathrm{Display}\left(\mathrm{m3}\right)$

The DataSets[Builtin][WorldMap] command was introduced in Maple 2017.

For more information on Maple 2017 changes, see Updates in Maple 2017.