I am having some slight problems with what you are saying, firstly If I use<br><br>proj -I +init=epsg:28355<br><br>I get a long list of different projections but no new numbers or anything.<br><br>Also secondly I am not exactly sure what input values I have to put it. Is it my current extent or is it the longitude latitude values which match this?
<br><br>What I want to get out is the correct extent for my map in EPSG:4326.<br><br>Its current extent using EPSG:28355 is 301964.225304 6172911.602455 439497.461276 6230476.242273<br><br>With latitude and longitude 146.123
-34.2918 146.152 -34.2685<br><br><br><div><span class="gmail_quote">On 7/18/07, <b class="gmail_sendername">Frank Warmerdam</b> <<a href="mailto:warmerdam@pobox.com">warmerdam@pobox.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;">
Bradley Mclain wrote:<br>> What I am trying to do is get the extent of my data which is on<br>> SRS:28355 and convert it too SRS:4326 so my map will display correctly.<br>><br>> I used the command<br>><br>> proj +proj=longlat +ellps=WGS84 +datum=WGS84 <
geogdata.txt >results.txt<br>><br>> but it returned<br>><br>> +proj=latlong unsuitable for use with proj program<br><br>Bradley,<br><br>With the proj command transformation is always implicitly between a<br>
projected coordinate system and the corresponding geographic coordinate<br>system.<br><br>So you could do:<br><br> proj -I +init=epsg:28355<br><br>to translate from EPSG:28355 coordinates to GDA_1994 coordinates (essentially
<br>WGS84 as I understand it). (Note the -I, to invert the normal lat/long to<br>projected transformation)<br><br>If you want to more explicitly control things, use cs2cs.<br><br>eg.<br>cs2cs +init=epsg:28355 +to +proj=latlong +datum=WGS84
<br><br>Best regards,<br>--<br>---------------------------------------+--------------------------------------<br>I set the clouds in motion - turn up | Frank Warmerdam, <a href="mailto:warmerdam@pobox.com">warmerdam@pobox.com
</a><br>light and sound - activate the windows | <a href="http://pobox.com/~warmerdam">http://pobox.com/~warmerdam</a><br>and watch the world go round - Rush | President OSGeo, <a href="http://osgeo.org">http://osgeo.org
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