[mapserver-users] Possible to let the user measure distances and areas?

[Daniel Morissette]

Stephen, Peter,

The ROSA applet supports this.  However it has no knowledge of
projections, so the measured distance is just an approximation as stated
in the documentation.

For an example of a site using this, see:
  http://www.sis.ec.gc.ca/msapps/ec_species/htdocs/ec_species_e.phtml

and for the docs, look for "Distance Measurement Tool" in 
  http://www2.dmsolutions.ca/webtools/rosa/rosa_params.html

Daniel



Stephen Woodbridge wrote:
> 
> Peter,
> 
> I don't think the current Rosa or mapplet applets support this
> functionality, but if any of our Java programmers (hint, hint, wink,
> nudge) where inclined to add it that would be cool functionality to
> have. You would have to extend the applet interface to include some
> knowledge about the projection to get accurate computations. At smaller
> scales you can probably make some assumptions that make the calculations
> simplier by assuming that the points are on a flat plain and not on the
> curvature of the earth.
> 
> -Steve W.
> 
> Peter wrote:
> >
> > Hi listers!
> >
> > Is it possible to get the distances and areas with mapserver-projects?
> > The user should click two times on the map and get the length in meters...
> > We have the mapimage within an applet...
> >
> > Thanks
> >
> > Peter