latlong2km

Convert longitude and latitude co-ordinates to kilometres west-east and
south-north from axes through (<code>lon0</code>,<code>lat0</code>) using the
"spherical law of cosines".

Density surface modelling of line transect data. A Generalized
Additive Model-based approach is used to calculate spatially-explicit estimates
of animal abundance from distance sampling (also presence/absence and strip
transect) data. Several utility functions are provided for model checking,
plotting and variance estimation.

Laura Marshall

Density Surface Modelling of Distance Sampling Data

latlong2km function

<dl><dt>lon</dt>
<dd>longitude</dd>
<dt>lat</dt>
<dd>latitude</dd>
<dt>lon0</dt>
<dd>longitude reference point (defaults to mean longitude)</dd>
<dt>lat0</dt>
<dd>latitude reference point (defaults to mean latitude)</dd></dl>

Arguments

Author

Convert latitude and longitude to Northings and Eastings — latlong2km

<dl>

<dt>lon</dt>
<dd>longitude</dd>


<dt>lat</dt>
<dd>latitude</dd>


<dt>lon0</dt>
<dd>longitude reference point (defaults to mean longitude)</dd>


<dt>lat0</dt>
<dd>latitude reference point (defaults to mean latitude)</dd>

</dl>

latlong2km: Convert latitude and longitude to Northings and Eastings

Description

Usage

Value

Arguments

Author

Details