[Qgis-user] Mapinfo and qgis file's datum problem

[nagellette]

Hi André,

I know that EPSG:4326 units are in degrees, so that I calculated the degree
equvelant of 100m asuming my 100m lies on sphere. 

I get what you mean but 100degree circle is really big but this is not the
situation. As you can see from the comparison images, the radius is ok in
one axis. 

Thank for your time.



Andre Joost wrote
> Am 29.11.2013 15:48, schrieb nagellette:
>> his post has NOT been accepted by the mailing list yet. Hi All,
>>
>> I am new at Qgis and I enjoyed and find it usefuşş for most parts. I
>> am currently using map info for some buffer analysis and had some
>> problems about trying to do same analysis in qgis.
>>
>> I am trying to put a ring buffer for 100m. I converted 100m into
>> degrees since my default projection in qgis is wgs84 epsg:4326. I
>> putted a point got a ring in qgis.
>>
>> Ring created in qgis
>> <http://osgeo-org.1560.x6.nabble.com/file/n5091891/ring_qgis.jpg>
> 
> If your projection is EPSG:4326, units are in degrees. So your buffer in 
> QGIS is not 100m, but 100°. You have to reproject your data to a CRS 
> that has metres as units, like UTM for your part of the world.
> 
> 
> HTH,
> André Joost
> 
> 
> 
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