[Talk-ca] Using ImportImagePlugin in JOSM

[Peter Freeman]

Hi Stewart,

Thanks!  I have just installed Quantum GIS (I'm running Ubuntu 10.10)
and have loaded the JPEG as a raster file and am now learning how do do
what you suggested. 

Cheers,

Peter

Peter Freeman
180 Musgrave Place
Salt Spring Island, V8K 1V5
British Columbia, Canada
(250) 653-4623
http://members.shaw.ca/petersfreeman

On 11-01-30 11:24 AM, Stewart C. Russell wrote:
> Hi Peter,
>
> It's been a while since I hand-rolled a world file. If you can, install
> a recent version of QGis, as it has a truly excellent georeferencer. You
> click on control points on the bitmap, indicate the coordinates they
> represent in the real world, then set the system off transforming the map.
>
>
>> The map file is called map.jpg and I have created a world file called
>> map.wld
> I'd call that map.jgw, which is the convention for JPEG world files.
> (TIFF has tfw, PNG pgw, and so on.)
>
>> 100.0
>> 0.0
>> 0.0
>> -100.0
>> 103.5
>> 1.5
> Ooh, that can't be right. Lines 1 and 4 are units/pixel; if you're using
> geographic coordinates, that's 100°/pixel. This wants to be a small number.
>
>
>> Can you give me reasonably correct values for my world file?
> Lines 1 and 4 might want to be 0.01 and -0.01 respectively for 100
> pixels/degree.
>
>> Do I need to create a projection file
> It helps, but these are even harder to produce by hand than world files.
> I think that QGis can produce them in the georeferencer.
>
>  Stewart
>
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