[Qgis-user] Antarctic polar stereographic graticules (composer)

[Lester Anderson]

Hi Nicolas,

The grid I have is already projected in an Antarctic South polar, so that
was not the issue with on the fly projection. I just fail to understand why
the graticules in map composer seem odd in Polar views. As you say, the
other option is to generate a vector grid and densify, however you then
lose the label function that you have in the composer.

Coastline data reproject fine on both South and North Polar views. Will
keep investigating this one

Lester



On 1 June 2016 at 17:40, Nicolas Cadieux <nicolas.cadieux at archeotec.ca>
wrote:

> Hi,
>
> When crossing the equator, 0 or 180 degrees, you will always have
> difficulty reprojecting shapes on the fly.  That is what you are doing.
> Your project is in polar but you are creating a grid in WGS84.
>
> That grid is being reprojected on the polar project.  That will always
> happen when you try mix a more "global" CRS and a "local" projection.
>
> Make sure everything is in the same CRS. (Save as.. change CRS).
>
> Do not reprojection anything including the grids in the map composer.
>
> If that does not work, you could always create the grid that you need (You
> may need to densify the shape).  Save it in the correct CRS. You could then
> probably add a transparent grid in the map composer.  This way, you would
> get the coordinates around the map but not the problems with the grid.
>
> Hope this helps.
>
> Nicolas
> On Jun 1, 2016 11:14 AM, Lester Anderson <arctica1963 at gmail.com> wrote:
>
> Hi Nicolas,
>
> The problem is not so much with the grid as that displays fine. The issue
> crops up with the map composer, and even with the grid as WGS-84 the same
> problem persists. Looked at both North and South polar views and the 180
> graticule is always missing irrespective of the increment used. The
> latitude lines do not change and are clear line segments; these should be
> smoother.
>
> Data that are in UTM and with WGS-84 graticules look fine (smooth latitude
> lines). Is there an issue with Polar views and graticules?
>
> Lester
>
>
>
> On 1 June 2016 at 11:41, Nicolas Cadieux <nicolas.cadieux at archeotec.ca>
> wrote:
>
> Hi,
>
> Try saving the layer in WGS-84. Then make sure the project is also in the
> same projection.  It can help sometimes to make a spatial index.
> Keep me posted.
>
> Nicolas
> On Jun 1, 2016 05:35, "Lester Anderson [via OSGeo.org] " <[hidden email]
> <http:///user/SendEmail.jtp?type=node&node=5269320&i=0>> wrote:
>
> Hello,
>
> I had some Antarctic polar stereographic data and when applying a
> WGS-84 long-lat grid in map composer it generated most of the
> longitude lines (180 missing), and very crude latitude lines (clearly
> visible straight line segments).
>
> Is there any way to improve the latitude lines?
>
> Lester
>
> Tested in 2.10, 2.12, 2.14
>
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