[Geomoose-users] Scalebar measurement in Demo

[Kevin Grootendorst]

Thanks, I may be able to sacrifice the EPSG 3857 data once I get my hands
on another imagery source.
Cheers.
Kevin

On Wed, Dec 14, 2016 at 12:39 PM, James Klassen <klassen.js at gmail.com>
wrote:

> The scalebars are generated by MapServer and the measure tool is done
> within GeoMoose.
>
> I know GeoMoose does some trickery to get semi-accurate measurements in
> the awfulness that is the web-merc (3857) projection.
>
> It looks like MapServer is using the web-merc coordinates directly as
> "meters" to generate the scalebar.
>
> I am not sure if anything can be done to resolve this short of using an
> appropriate local projection (and thus sacrificing compatibility with the
> web-merc based tile sets).
>
> On Dec 14, 2016 11:09, "Kevin Grootendorst" <kgrootendorst at gmail.com>
> wrote:
>
>> Dear users,
>> I noticed in the v2.9 demo that the scalebars are not accurate.
>> I measured a line (red line in graphic) adjacent to the scalebar and
>> found a difference in length (~462ft measured vs ~640ft on the scalebar).
>> What is the reason for this? Projection issue?
>>
>> [image: Inline image 1][image: Inline image 2]
>>
>> Cheers,
>> Kevin
>>
>> _______________________________________________
>> Geomoose-users mailing list
>> Geomoose-users at lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/geomoose-users
>>
>
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