maptrimp - Trim polygons to latitude-longitude quadrangle

Syntax

[latTrimmed,lonTrimmed] = maptrimp(lat,lon,latlim,lonlim)

Description

[latTrimmed,lonTrimmed] = maptrimp(lat,lon,latlim,lonlim) trims the polygons in lat and lon to the quadrangle specified by latlim and lonlim. latlim and lonlim are two-element vectors, defining the latitude and longitude limits respectively. lat and lon must be vectors that represent valid polygons.

Remarks

maptrimp conditions the longitude limits such that:

lonlim(2) always exceeds lonlim(1)
lonlim(2) never exceeds lonlim(1) by more than 360
lonlim(1) < 180 or lonlim(2) > -180
Should the quadrangle span the Greenwich meridian, then that meridian appears at longitude = 0.

Example

Display a world map of coastline data, trim the dataset to a specific geographic area, and display a map of this trimmed data.

coast = load('coast.mat');
figure
mapshow(coast.long, coast.lat, 'DisplayType', 'polygon');

Original Map

latlim = [-50 50];
lonlim = [-100 50];
[latTrimmed, lonTrimmed] = maptrimp(coast.lat, coast.long, ...
   latlim, lonlim);
figure
mapshow(lonTrimmed, latTrimmed, 'DisplayType', 'polygon');

Map with Trimmed Data

maptrimp - Trim polygons to latitude-longitude quadrangle

Syntax

Description

Remarks

Example

See Also

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