LatLon2XY.centered

The function LatLon2XY.centered(MyMap, lat,lon,zoom) computes the coordinate transformation from lat/lon to map tile coordinates given a map object.

Serves two purposes: (i) Provide a
comfortable R interface to query the Google server for static
maps, and (ii) Use the map as a background image to overlay
plots within R. This requires proper coordinate scaling.

Markus Loecher

RgoogleMaps

Overlays on Static Maps

LatLon2XY.centered function

<dl> <dt>MyMap</dt>
<dd>map object</dd> <dt>lat</dt>
<dd>latitude values to transform</dd> <dt>lon</dt>
<dd>longitude values to transform</dd> <dt>zoom</dt>
<dd>optional zoom level. If missing, taken from <code>MyMap</code></dd></dl>

Arguments

Author

computes the centered coordinate transformation from lat/lon to map tile coordinates — LatLon2XY.centered

<dl>



 <dt>MyMap</dt>
<dd>map object</dd>



 <dt>lat</dt>
<dd>latitude values to transform</dd>



 <dt>lon</dt>
<dd>longitude values to transform</dd>



 <dt>zoom</dt>
<dd>optional zoom level. If missing, taken from <code>MyMap</code></dd>



</dl>

LatLon2XY.centered: computes the centered coordinate transformation from lat/lon to map tile coordinates

Description

Usage

Value

Arguments

Author

See Also