[Qgis-user] Map graticules in QGIS

[Alex Mandel]

On 03/10/2013 03:49 PM, Lester Anderson wrote:
> On 10 March 2013 22:22, Alex Mandel <tech_dev at wildintellect.com> wrote:
> 
>> On 03/10/2013 03:13 PM, Lester Anderson wrote:
>>
>>> Hello,
>>>
>>> The one major element missing from the otherwise great Quantum GIS, is
>>> that
>>> of easy setup map graticules. There is a basic way of doing simple ones in
>>> the print composer which is fine for geographic (WGS84) or UTM etc type
>>> projections, but will not work for conic or stereographic etc.
>>>
>>> Is there a plugin for doing this work (that is built-in to layout mode in
>>> ArcGIS) or is this an upgrade/update that will be available in a new
>>> release?
>>>
>>> Generating a vector grid does not work properly in 1.8.0, and certainly
>>> only partially completes a Polar Stereographic layout. There are clearly
>>> flaws that need to be addressed. If there is a reliable workaround for
>>> this, it would be good to know.
>>>
>>> Lester
>>>
>>>
>> A workaround is to make the graticule in WGS84 and reproject it to the
>> desired end projection. I found that it doesn't curve well so I wrote this
>> script to make graticules with a higher points density that projects well.
>>
>> https://github.com/**wildintellect/pyGraticule<https://github.com/wildintellect/pyGraticule>
>>
>> I hope to work it into QGIS at a later point, but you can use it
>> standalone with python to make what you need, import and reproject.
>>
>> Thanks,
>> Alex
>>
>>
> Hi Alex,
> 
> I have tried the route you suggested. I am working on Antarctic data, so
> generated a vector grid for 0-360 in X (at 10 degrees) and latitude (-90 to
> -60) in 10 degrees. That all worked fine in WGS84. However, reprojecting to
> Antarctic Polarstreographic did not project correctly with less than half
> the meridians and no latitudes.
> 
> Cheers
> Lester
> 

This will probably get stripped from the list but I've attached a shp I
made that should be what you need. Let me know if you need me to upload
it to server for download.

Note projection on the fly has some odd bug that makes 180/-180
disappear, I've not spent enough time to figure out what that is.

What I did:
Used my pyGraticule script modified to go from -90,1
Reprojected to Polar EPSG:3031 as a shapefile

I'm trying to remember how I did
http://geography.ucdavis.edu/image/499
If I remember I'll post some more details.

Thanks,
Alex


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