[Qgis-user] Beginner: scanned and georeferenced map looks stretched

Alister Hood alister.hood at synergine.com
Fri Jul 29 19:15:56 PDT 2011


Hi Magnus,
For on-the-fly reprojection to work, also check that the layer has the CRS assigned (right click on the layer > "set CRS").

Regards,
Alister

> Date: Fri, 29 Jul 2011 19:32:06 +0200
> From: Magnus Ekhall <magnus.ekhall at gmail.com>
> Subject: Re: [Qgis-user] Beginner: scanned and georeferenced map looks
>	stretched
> To: tech at wildintellect.com
> Cc: qgis-user at lists.osgeo.org
> Message-ID:
>	<CADHdaBQcJ0QXpW7HLeGKXf30Xf5cWiAYxB4aJ6T2maaA+EyF8A at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> I've tried that by going to Settings -> Project Settings and switching
> to SWEREF99 there (immediate coordinate transformation box is ticked).
>
> But nothing happens at all which is surprising.
>
> When I look at the paper map I can see that indeed the SWEREF99
> coordinates are square, but the WGS84 are stretched vertically.
>
> Am I doing something wrong with the reprojection?
>
> Regards,
> Magnus
>
> On 29 July 2011 19:27, Alex Mandel <tech_dev at wildintellect.com> wrote:
>> On 07/29/2011 09:49 AM, Magnus Ekhall wrote:
>>> I'm a beginner with qgis and need some help.
>>>
>>> I've scanned a map and georeferenced it using the plugin.
>>>
>>> When it appears in qgis it looks stretched: about double as wide as on paper.
>>> However, the coordinates are correct. I can load a gpx-file into a
>>> vector layer, and it gets overlaid on the correct parts of the raster
>>> map.
>>>
>>> Is there a way to change horizontal and/or vertical scale on the screen?
>>>
>>> I think the reason might be (please correct me if I'm wrong) that the
>>> paper map is originally in SWEREF99, but I georeferenced in using
>>> points of WGS84...
>>>
>>> I tried to georeference it in SWEREF99 directly, but then the gpx
>>> tracks would load to completely different areas.
>>>
>>> Regards,
>>> Magnus
>>
>> Try reprojecting it to the SWEREF99 and it will likely look more like
>> the paper map.
>>
>> Enjoy,
>> Alex
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