Create Buffer Error

[digitalaviator]

Hi Mike,

Attempted to use new create buffer for polygon area for all California Counties...

Number of buffer zones for each feature: 1
Buffer Distance: 100m
Combine overlapping buffer areas: unchecked

Getting the following error a few times on the state:

Error creating buffer for feature.
Error joining areas for buffer

PolygonUtils.cpp - 83
Version: v11.02
Build Time: Feb 22 2010 15:37:36

Attached the .shp file...

It appears from the error it's trying to combine overlapping buffer areas but I'm wondering what may be causing this error?

Kindest Regards,
Dean.

[global_mapper]

Dean,

I'll take a look and see if I can track down the problem.

Thanks,

Mike
Global Mapper Support
support@globalmapper.com

[global_mapper]

Dean,

I was able to get this fixed so now you shouldn't get that error. I have placed a new build at http://www.globalmapper.com/global_mapper11.zip with the change for you to try. Simply download that file and extract the contents into your existing v11.xx installation folder to give it a try. If you are using the 64-bit v11 version there is a new build at http://www.globalmapper.com/global_mapper11_64bit.zip .

Let me know if I can be of further assistance.

Thanks,

Mike
Global Mapper Support
support@globalmapper.com

[digitalaviator]

Hi Mike,

I just tried this and still no joy:

Error creating buffer for feature.
Error joining areas for buffer

PolygonUtils.cpp - 93
Version: v11.02
Build Time: May 2 2010 21:58:42

Settings are:

Select all areas first...
Number of Buffer Zones = 1
Buffer Distance = 100m (also tried 10m)
Combine Overlapping Buffer Areas = Off

Dean.

[global_mapper]

Dean,

I was able to reproduce the problem and fix it. I have placed a new build at http://www.globalmapper.com/global_mapper11.zip with the change for you to try. Simply download that file and extract the contents into your existing v11.xx installation folder to give it a try. If you are using the 64-bit version, there is a new build available at http://www.globalmapper.com/global_mapper11_64bit.zip .

Let me know if I can be of further assistance.

Thanks,

Mike
Global Mapper Support
support@globalmapper.com

[digitalaviator]

Hi Mike,

Looks good so far :-) Thanks... Will see if I manage to break it on a bigger dataset

Cheers,
Dean.

[digitalaviator]

Hmm, okay it worked for one file but for a different shp file:

---------------------------
Global Mapper
---------------------------
Error creating buffer for feature Alameda
Error joining areas for buffer
Polygon join failed! Invalid polygon.

PolygonUtils.cpp - 107
Version: v11.02
Build Time: May 3 2010 21:51:23
Use Ctrl+V to Paste Error
---------------------------
OK
---------------------------

[digitalaviator]

Hi Mike,

I'm still getting errors in trying to generate buffers...

I'm not sure what's going on but yesterday when I created buffers for California (off a tiger county boundary dataset), it choked on 3 of the counties and gave the same error messages as before about "Error joining areas for buffer".

I went back and manually selected those counties by themselves and created a buffer without any problems.

However today with Florida and Uath I've been taking the same approach to work around the bug, but even the individual counties are giving me grief and I can't even create a buffer around the areas selected individually without getting the above "Error joining areas for buffer" bug.

Is there anything more I can to to help track down this bug?

[global_mapper]

Dean,

Can you provide the Florida and Utah file that are causing problems? The true issue here is that the 3rd-party area combining library used in side Global Mapper has problems in a lot of cases, but so far I've been able to fix/work-around them, although the lack of robustness in the library is really straining things.

Note that even though you are combining buffers, there are still a large number of area combines done when creating buffers as buffers create range rings around each vertex as well as rectangular corridors around each segment, then combine those areas to create the buffers.

Thanks,

Mike
Global Mapper Support
support@globalmapper.com

[digitalaviator]

Hi Mike,

I've attached the zip file and will PM you the password...

Note that even though you are combining buffers, there are still a large number of area combines done when creating buffers as buffers create range rings around each vertex as well as rectangular corridors around each segment, then combine those areas to create the buffers.

Note: I have combining buffers checked as off as I'm trying to keep all area files separate, unless I'm not understanding the above