# Documentation

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# quiver3m

Project 3-D quiver plot on map axes

## Syntax

```h = quiver3m(lat,lon,alt,u,v,w) h = quiver3m(lat,lon,alt,u,v,w,linestyle) h = quiver3m(lat,lon,alt,u,v,w,linestyle,'filled') h = quiver3m(lat,lon,alt,u,v,w,scale) h = quiver3m(lat,lon,alt,u,v,w,linestyle,scale) h = quiver3m(lat,lon,alt,u,v,w,linestyle,scale,'filled') ```

## Description

`h = quiver3m(lat,lon,alt,u,v,w)` displays velocity vectors with components `(u,v,w)` at the geographic points `(lat,lon)` and altitude `alt` on a displayed map axes. The inputs `u`, `v`, and `w` determine the direction of the vectors in latitude, longitude, and altitude, 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 = quiver3m(lat,lon,alt,u,v,w,linestyle)` where `linestyle` is a `linespec` that controls the type of line used. If you use symbols, they are plotted at the start points of the vectors, i.e., the input points (`lat`,`lon`,`alt`).

`h = quiver3m(lat,lon,alt,u,v,w,linestyle,'filled')` results in the filling in of any symbols specified by `linespec`.

`h = quiver3m(lat,lon,alt,u,v,w,scale)`, ```h = quiver3m(lat,lon,alt,u,v,w,linestyle,scale)``` and ```h = quiver3m(lat,lon,alt,u,v,w,linestyle,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`,`alt`) to (`lat+u`,`lon+v`,`alt+w`).

## Examples

collapse all

Plot 3-D quiver vectors from London (51.5°N,0°) and New Delhi (29°N,77.5°E), both at an altitude of 0. Suppress the automatic scaling. Terminate both vectors at an altitude of 1; the London vector should terminate 100° southward and 70° eastward, while the New Delhi vector should terminate 50° northward and 10° eastward.

```load coastlines axesm miller; view(3) plotm(coastlat,coastlon) lat0 = [51.5,29]; lon0 = [0 77.5]; alt = [0 0]; u = [-40 50]; v = [-70 10]; w = [1 1]; quiver3m(lat0,lon0,alt,u,v,w,'m') tightmap```