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I am using the Buffer tool in QGIS to put a 30 Meter buffer around a number of points. When I do this the buffer ends up taking over the entire map. enter image description here

initial points

buffer tool

Finished buffer 1

Finished buffer 2

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    Check the coordinate system of your source data that it is in a UTM or other system defined in METRES - otherwise, you're likely in WGS84, where '30' decimal degrees is MASSIVE... – DPSSpatial Jun 2 '16 at 21:09
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    I would guess that your data are in EPSG:4326 and the buffer of 30 units is not 30 meters but 30 degrees. – user30184 Jun 2 '16 at 21:10
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you could also do the conversion from degrees to meters which changes depending on the coordenates , on my case NE of Spain 0.000004°=0.9 mts approx. There are on line calculators like http://msi.nga.mil/MSISiteContent/StaticFiles/Calculators/degree.html

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The solution was:

Right-Click on the Layer > Save As > Change the CRS to (NC State Plane) > New Project > Project > Project Properties > On the Fly > NC State Plane > Vector > Geoprocessing Tools > Buffer > Unit = 98.424 (30 * 3.2808)

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