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Hi:

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<br>

I am an land surveyor and programmer in Spain.

<br>

I would like to talk about the projection used in JOSM and in

OpenStreetMap. I was studying the projection in Google Earth and World

Wind, and i think that they have a good choice.

<br>

<br>

They work always in the geodetic coordinates-<b>plate carrée</b>:

<br>

<br>

x=longitude

<br>

y=latitude

<br>

<a class="moz-txt-link-freetext"

 href="http://en.wikipedia.org/wiki/Plate_carr%C3%A9e_projection">http://en.wikipedia.org/wiki/Plate_carr%C3%A9e_projection</a>

<br>

<br>

<br>

Using this method you can always measure distances and angles over the

ellipsoid using the Vicenty method and don´t need projection

conversions:

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Here the document:

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<a class="moz-txt-link-freetext"

 href="http://www.ngs.noaa.gov/PUBS_LIB/inverse.pdf">http://www.ngs.noaa.gov/PUBS_LIB/inverse.pdf</a>

<br>

Here source code in javascript and c#:

<br>

<a class="moz-txt-link-freetext"

 href="http://www.movable-type.co.uk/scripts/latlong-vincenty.html">http://www.movable-type.co.uk/scripts/latlong-vincenty.html</a>

<br>

<a class="moz-txt-link-freetext"

 href="http://www.gavaghan.org/blog/free-source-code/geodesy-library-vincentys-formula/">http://www.gavaghan.org/blog/free-source-code/geodesy-library-vincentys-formula/</a>

<br>

<br>

Our ellipsoid is always WGS84

<br>

<br>

<br>

<br>

<br>

My web is

<br>

<a class="moz-txt-link-abbreviated" href="http://www.opengeomap.org">www.opengeomap.org</a>

<br>

<br>

<br>

Regards.

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