[Qgis-user] Buffersize circa 0.666

[Alexandre Neto]

Like Maurício said, the origin of the "problem" might come from the use of
different projections for layer and project.

The buffer tool will use the input layer's units (from the layer's
projection), and it will calculate it with precision. On the other hand,
the measure tools use the project's Coordinate System units. Due to the
differences\distortion between the projections, the values will probably
not be the same.

If you need the buffers at the project CRS, you should convert the original
data to it first.

Hope it helped,

Alexandre Neto

On Thu, Jul 25, 2013 at 2:51 PM, Mauricio de Paulo
<mauricio.dev at gmail.com>wrote:

> I'm guessing here, but are you using on the fly projection? I'm not
> entirely sure if the buffer works on the displayed projection or the
> layer's projection, but I'm guessing that it's in the layer's.
> All the best,
> Maurício de Paulo
>
> On 07/25/2013 10:09 AM, qgis-user-request at lists.osgeo.**org<qgis-user-request at lists.osgeo.org>wrote:
>
>> Message: 1
>> Date: Thu, 25 Jul 2013 11:44:08 +0200
>> From: "Koning, Bart" <B.Koning at vrzw.nl>
>> To: <qgis-user at lists.osgeo.org>
>> Subject: [Qgis-user] Buffersize circa 0.666
>> Message-ID:
>>         <1AA138CF303B78408EC8F0F30EEF4**58C0491E4ED at RBZW-SRV10.RBZW.NL<1AA138CF303B78408EC8F0F30EEF458C0491E4ED at RBZW-SRV10.RBZW.NL>
>> **>
>> Content-Type: text/plain; charset="us-ascii"
>>
>>
>> Dear all,
>>   When adding a buffer to a centroid (VECTOR --> GEOPROCESSING TOOLS -->
>> BUFFER(S)), the size of the buffer is circa 0.666 * smaller than I
>> expect. E.G. Buffersize input 100, results in a 66,67 m buffer.
>>   I now must multiply the real buffersize by 1.65 to get the desired
>> result.
>>   Who knows what the problem is?
>>   Kind regards,
>> Bart Koning
>>
>>
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