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ArcGIS 10 Desktop : buffers are being cut off

YvanStg

Hello,

I recently encountered a problem with the Geoprocessing/buffer tool : I want to create 186km individual (disolve=NONE) buffers around a set of points and the resulting buffers located on the edge of my dataset are being cut off.
I thought it could be due to a wrong map extent but it doesn't seem to be the case.
Moreover, when adding new points outside of my dataset, their buffers are also being cut off. See screenshot (pink : full dataset/ blue: new points).[ATTACH=CONFIG]26700[/ATTACH]

Any idea what could cause this ?
It is not the first time I use the buffer tool and I haven't had any problems with it in the past.

Thanks a lot,
Yvan

buffer.PNG

PhilipWilson_0-1631592752835.png

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Hornbydd

Are they actually being cut? You can test this just by looking at the area of the buffer polygon. If they are the same then it would suggest you have a clipping extent set on the DataFrame.

If they are genuinely being cut this would suggest an extent has been set on the tools environment settings, or the applications environment settings or the the model environment settings.

YvanStg

Hi Duncan, thanks for your reply.

yes, they are being cut "for real": the polygons' areas are not equal (nor close to equal). See the screenshot of the attribute table: polygon2, which is the blue one at the bottom left corner, as an area half the size of the others in the same layer.[ATTACH=CONFIG]26704[/ATTACH]

The extent varies with the datasets (blue and pink buffers are cut at different extents), so it seems right that the extent has been set on the tool environment settings.
Is there any way to change that ?

AttributeTable.PNG

ChrisSnyder

Looks like you are using a geographic projection. What are the lat/lng of some of the ones being cut off. Do the buffers extend into another hemisphere?

YvanStg

Hi Chris,

I do use a projection (WGS 1984 World Mercator). All of my points are in the Northern hemisphere, between -40/-90 Lon and 50/9 Lat. See map attached[ATTACH=CONFIG]26706[/ATTACH]

map.PNG

ChrisSnyder

Hmmm... You didn't accidently set the analyis extent environment variable (http://resources.arcgis.com/en/help/main/10.1/index.html#/Output_Extent/001w00000009000000/)? Although I wouldn't think it would cut off the buffer like that, but maybe.

YvanStg

My Processing Extent in Environment Settings is "Default". [ATTACH=CONFIG]26707[/ATTACH]
So, if I understand well, this means that the extent is based on the input of the Buffer tool. Now, it could explain why I have different extents for different datasets/inputs, but not why the results of the tool are cut off. Or that can be the reason ?...

environmentsettings.PNG

ChrisSnyder

I'm baffeled - what if you use a non-geographic coordinate sytem? Try projecting your points to something like Albers Equal Area Coinic and then try buffering (or maybe just try to specify Albers as the output Spatial ref in the envr variables). Do you get the same issue?

ChrisSnyder

Can you post your point FC (should be small enough to post here, right?)?

YvanStg

I just tried projecting in North America Albers Aqual Area Conic and the buffer polygons come out whole: none of them are being cut off.
Now why this happens, I don't understand...

YvanStg

Can you post your point FC (should be small enough to post here, right?)?

I'm afraid I don't know how to do that... but also, the data is not mine, so I don't feel confident about giving it away.
However, I had the same issue with the smaller, custom-made dataset attached.
My geographic coordinate system is GCS_WGS_1984, projected with WGS 1984 World Mercator

Book3.xls

ChrisSnyder

don't feel confident about giving it away

Gotcha.

Well, using a projected coordinate system seems to be a work around...

You should contact ESRI support.

YvanStg

You should contact ESRI support.

Yeah, I guess that will be the only way to know why this happens.

Well, thanks a lot for your help Chris and Duncan !

YvanStg

Follow-up :
I contacted ArcGIS Support but didn't get an answer yet.

Re-projecting in WGS 1984 World Mercator my dataset that's already in WGS 1984 World Mercator (Data Management/ Project), works fine too.

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