Biz<br><br><div><span class="gmail_quote">On 10/18/05, <b class="gmail_sendername">Biz King</b> <<a href="mailto:biz.king@mac.com">biz.king@mac.com</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
The problem I have is that I am being given GPS (WGS84) co-ordinates and need to convert them<br>for use within the same data sets.<br></blockquote></div><br>
Are these WGS84 coordinates in a shapefile or some GIS data format
already? If so, Mapserver can handle data in disparate projections by
reprojecting "on-the-fly":<br>
<br>
1. Your MAP's projection ("init=epsg:4326") will be the common output projection.<br>
2. Your LAYER's projection will define the actual native coordinate
system of the dataset (One would be UTM the other latlong, etc) If the
layer projection differs from the map projection, it will be
reprojected everytime you request an image. <br>
<br>
The reprojection is pretty fast but keep in mind that reprojecting HUGE
datasets will slow things down so it's best to preprocess them in that
case. A tool like ogr2ogr (<a href="http://gdal.maptools.org/ogr/ogr2ogr.html">http://gdal.maptools.org/ogr/ogr2ogr.html</a>)
can reproject vector data.<br>
<br>
Hope this helps,<br>-- <br>Matt Perry<br><a href="mailto:perrygeo@gmail.com">perrygeo@gmail.com</a><br><a href="http://www.perrygeo.net">http://www.perrygeo.net</a>