quiverm

Project 2-D quiver plot on map axes

Syntax

h = quiverm(lat,lon,deltalat,deltalon)
h = quiverm(lat,lon,deltalat,deltalon,LineSpec)
h = quiverm(lat,lon,deltalat,deltalon,LineSpec,'filled')
h = quiverm(lat,lon,deltalat,deltalon,scale)
h = quiverm(lat,lon,deltalat,deltalon,LineSpec,scale,'filled')


Description

h = quiverm(lat,lon,deltalat,deltalon) displays velocity vectors with components (deltalat,deltalon) at the geographic points (lat,lon) on displayed map axes. All four inputs should be in the AngleUnits of the map axes. The inputs deltalat and deltalon determine the direction of the vectors in latitude and longitude, respectively. The function automatically determines the length of these vectors to make them as long as possible without overlap. The object handles of the displayed vectors can be returned in h.

h = quiverm(lat,lon,deltalat,deltalon,LineSpec) specifies the line style, marker, and color. If you use markers, they are plotted at the start points of the vectors, i.e., the input points (lat,lon).

h = quiverm(lat,lon,deltalat,deltalon,LineSpec,'filled') results in the filling in of any symbols specified by LineSpec.

h = quiverm(lat,lon,deltalat,deltalon,scale) and h = quiverm(lat,lon,deltalat,deltalon,LineSpec,scale,'filled') alter the automatically calculated vector lengths by multiplying them by the scalar value scale. For example, if scale is 2, the displayed vectors are twice as long as they would be if scale were 1 (the default). When scale is set to 0, the automatic scaling is suppressed, and the length of the vectors is determined by the inputs. In this case, the vectors are plotted from (lat,lon) to (lat+deltalat,lon+deltalon).

Examples

Plot Quiver Vectors Corresponding to Latitude and Longitude

Load the coast lines dataset.

load coastlines

Setup an axes specifying latitude and longitude limits. Plot the coast line data.

axesm('eqaconic','MapLatLimit',[30 60],'MapLonLimit',[-10 10])
framem; 
plotm(coastlat,coastlon)

Plot quiver vectors in a direction corresponding to +5 degrees latitude and +3 degrees longitude. Use automatic scaling.

lat0 = [50 39.7]; 
lon0 = [-5.4 2.9];
deltalat = [5 5]; 
deltalon = [3 3];
quiverm(lat0,lon0,deltalat,deltalon,'r')

More About

Line Style, Marker, and Color

Specify the line style, marker, and color as a character vector or string containing symbols. The symbols can appear in any order. You do not need to specify all three characteristics (line style, marker, and color). For example, specify a red dashed line using '--r'.

Line Style	Description	Resulting Line
'-'	Solid line
'--'	Dashed line
':'	Dotted line
'-.'	Dash-dotted line

Marker	Description	Resulting Marker
'o'	Circle
'+'	Plus sign
'*'	Asterisk
'.'	Point
'x'	Cross
'_'	Horizontal line
'|'	Vertical line
's'	Square
'd'	Diamond
'^'	Upward-pointing triangle
'v'	Downward-pointing triangle
'>'	Right-pointing triangle
'<'	Left-pointing triangle
'p'	Pentagram
'h'	Hexagram

Color Name	Short Name	RGB Triplet	Appearance
'red'	'r'	[1 0 0]
'green'	'g'	[0 1 0]
'blue'	'b'	[0 0 1]
'cyan'	'c'	[0 1 1]
'magenta'	'm'	[1 0 1]
'yellow'	'y'	[1 1 0]
'black'	'k'	[0 0 0]
'white'	'w'	[1 1 1]

Version History

Introduced before R2006a