<div dir="ltr">I can't speak for the Google projection but when using the WGS84 UTM zones (EPSG:32617 for my test) for the projection the measure tool for vectors is working accurately. I'd have to say that this is a projection based issue that might only be resolved by using proj4js.<br clear="all">
--<br>Nathan Gerber<br>
<br><br><div class="gmail_quote">On Sun, Sep 7, 2008 at 11:17 PM, Jennifer Strahan <span dir="ltr"><<a href="mailto:jennifer@greeninfo.org">jennifer@greeninfo.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Thanks for the tip. I switched to satellite view and the measurement is<br>
still pretty far off (around 20 acres when it should be 13 acres). Also<br>
distances measured seem to be wrong. Any other ideas?<br>
<br>
Regards,<br>
<font color="#888888">Jennifer<br>
</font><div><div></div><div class="Wj3C7c"><br>
Adams wrote:<br>
> Keep in mind that at that zoom level, the width of the road is much more than is shown there.<br>
><br>
> The polygon that represents that area, was most likely constructed out of street intersections, i.e. the centre of the roads.. just so it looks better.<br>
><br>
> If you switched to satellite view you could probably get a better estimate with the measurement tool.<br>
><br>
> ----- Original Message -----<br>
> From: "Jennifer Strahan" <<a href="mailto:jennifer@greeninfo.org">jennifer@greeninfo.org</a>><br>
> To: <a href="mailto:users@openlayers.org">users@openlayers.org</a><br>
> Sent: Sunday, September 7, 2008 3:03:56 PM (GMT-0400) America/Glace_Bay<br>
> Subject: [OpenLayers-Users] Measure tool in 2.7 RC1<br>
><br>
> Hello,<br>
><br>
> Thanks for including the measuring tool! I'm wondering if there are any<br>
> guidelines for use that I should follow. I added a Google map layer to<br>
> the measure example and am finding some error with the measurements. Is<br>
> it possible that my map settings are wrong?<br>
><br>
> I measured Alamo Square in San Francisco and the area result is around<br>
> 92557 square meters (nearly 23 acres). The actual measurement should be<br>
> around 13 acres.<br>
><br>
> My test map is here:<br>
> <a href="http://www.parkinfo.org/review/measure.html" target="_blank">http://www.parkinfo.org/review/measure.html</a><br>
><br>
> Any suggestions as to how I can adjust my settings to get the correct<br>
> results?<br>
><br>
> Thanks,<br>
> Jennifer<br>
><br>
><br>
><br>
><br>
><br>
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</div></div></blockquote></div><br></div>