[Qgis-user] OpenLayers plugin bug

[Lynkos]

I have the same problem in Italy. A shape file of points in WGS84 displays
perfectly on other bases, but if I use an OpenLayers map such as Google as
the base, the points disappear, Sarah.


2013/10/23 Brent Wood <pcreso at pcreso.com>

>
> Hi,
>
> I have a problem with this very useful plugin.
>
> If I load a Postgis dataset which includes points across 180, for data
> captured around New Zealand, using longitudes in the 0-360 space (which is
> valid data for EPSG:4326) they plot fine in QGIS.
>
> If I then start the plugin & use a Google/Yahoo/etc basemap, the points
> are (usually) initially in the correct place and plot OK. Sometimes the
> points in the W hemisphere fail to render, sometimes they are OK. This is
> on a zoomed out map.
>
> As I zoom in, QGIS starts to omit the points in the W hemisphere
> altogether, even in the configurations that were OK when zoomed out. QGIS
> also sometimes starts to offset the points from the basemap, so that the
> western points on the map plot at an increasingly offset position, and the
> eastern points are missing. As I zoom back out, this offset is retained and
> the map fails to overlay the points correctly.
>
> I'm assuming this is related to the plugin switching the canvas to
> EPSG:3857 and failing to support the 0-360 longitude coordinates. Given
> Proj.4 is used as the reprojection engine, there should be no problems with
> the 0-360 coords being correctly mapped to EPSG:3857, as in my experience
> Proj.4 (cs2cs) has supported 0-360 input seamlessly for some years now.
>
>
> Is there any simple fix I can apply? If some funding is required to make
> the plugin work correctly across 180 with 0-360 longitude data, this is
> possible.
>
>
> inTHANKSvance
>
>
> Brent Wood
>
>
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>



-- 
*Sarah Gregg*
immagini - parole - territorio - natura
Web: www.wild-eyes.eu
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