The following table lists the available Mapping Toolbox™ patch polygon display functions.
|
Function |
Used For |
|---|---|
|
Filled 2-D map polygons | |
|
Filled 3-D map polygons in 3-D space | |
|
Display map latitude and longitude data in 2-D | |
|
Display map data without projection in 2-D | |
|
Patch objects projected on map axes | |
|
Patches projected as individual objects on map axes |
The fillm function makes use of the low-level function
patchm. The toolbox provides another patch drawing function
called patchesm. The optimal use of either depends on the application
and user preferences. The patchm function creates one displayed
object, which can contain multiple faces that do not necessarily connect. Mapping
Toolbox data arrays contain NaNs to separate unconnected patch faces, unlike
MATLAB® patch display functions, which cannot handle NaN-delimited data for
patches. The patchesm function, on the other hand, treats each face
as a separate object and returns an array of patch objects. In general,
patchm requires more memory but is faster than
patchesm. The patchesm function is useful
if you need to manipulate the appearance of individual patches (as thematic maps often
require).
The geoshow and mapshow functions provide a
superset of functionality for displaying unprojected and projected geodata,
respectively, in two dimensions. These functions accept geographic data structures
(geostructs and mapstructs) and coordinate vector arrays, but can also directly read
shapefiles and geolocated raster files. With them, you can map polygon data, controlling
rendering by constructing symbolspecs, data structures that you can
construct with the makesymbolspec function. You can easily
construct symbolspecs for point and line data as well as polygon data to control its
display in geoshow, mapshow, and
mapview.