# angle

Angle between sites

## Description

example

[az,el] = angle(site1,site2) returns the azimuth and elevation angles between site1 and site2.

example

[az,el] = angle(site1,site2,path) returns the angles using a specified path type, either a Euclidean or great circle path.

[az,el] = angle(___,Name,Value) returns the azimuth and elevation angles with additional options specified by name-value arguments.

## Examples

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tx = txsite('Name','MathWorks','Latitude',42.3001,'Longitude',-71.3504);
rx = rxsite('Name','Fenway Park','Latitude',42.3467,'Longitude',-71.0972);

Get the azimuth and elevation angles between the sites.

[az,el] = angle(tx,rx)
az = 14.0142
el = -0.2816

Get the azimuth angle between sites in degrees clockwise from north.

azFromEast = angle(tx,rx); % Unit: degrees counter-clockwise from east
azFromNorth = -azFromEast + 90 % Convert angle to clockwise from north
azFromNorth = 75.9858

tx = txsite('Name','MathWorks','Latitude',42.3001,'Longitude',-71.3504);
rx = rxsite('Name','Fenway Park','Latitude',42.3467,'Longitude',-71.0972);

Get the azimuth and elevation angles between the sites.

[az,el] = angle(tx,rx,'greatcircle')
az = 14.0635
el = 0

## Input Arguments

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Transmitter or receiver site, specified as a txsite or rxsite object. You can use array inputs to specify multiple sites.

Measurement path type, specified as one of the following:

• 'euclidean' — Use the shortest path through space connecting the antenna center positions of the sites.

• 'greatcircle' — Use the shortest path on the surface of the earth connecting the latitude and longitude locations of the sites. This path uses a spherical Earth model.

Data Types: char

### Name-Value Arguments

Specify optional pairs of arguments as Name1=Value1,...,NameN=ValueN, where Name is the argument name and Value is the corresponding value. Name-value arguments must appear after other arguments, but the order of the pairs does not matter.

Before R2021a, use commas to separate each name and value, and enclose Name in quotes.

Example: 'Map','siteviewer1'

Map for visualization or surface data, specified as a siteviewer object, a triangulation object, a string scalar, or a character vector. Valid and default values depend on the coordinate system.

Coordinate SystemValid map valuesDefault map value
"geographic"
• A siteviewer objecta.

• A terrain name, if the function is called with an output argument. Valid terrain names are "none", "gmted2010", or the name of the custom terrain data added using addCustomTerrain.

• The current siteviewer object or a new siteviewer object if none are open.

• "gmted2010", if the function is called with an output.

"cartesian"
• "none".

• A siteviewer object.

• The name of an STL file.

• A triangulation object.

• "none".

a Alignment of boundaries and region labels are a presentation of the feature provided by the data vendors and do not imply endorsement by MathWorks®.

Data Types: char | string

## Output Arguments

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Azimuth angle between site1 and site2, returned as M-by-N arrays in degrees. M is the number of sites in site1 and N is the number of sites in site2. The azimuth angle is expressed in degrees counter-clockwise from the east (for geographic sites), or from the global x-axis around the global z-axis (for Cartesian sites), ranging from -180 to 180 degrees.

Elevation angle between site1 and site2, returned as M-by-N arrays in degrees. M is the number of sites in site2 and N is the number of sites in site1. The elevation angle is expressed in degrees from the horizontal (or X-Y) plane, ranging from -90 to 90 degrees.

When you specify the path type as 'greatcircle', the elevation angle is always zero.

## Version History

Introduced in R2017b