Spatial join issues

[Greg Troxel]

Shaozhong SHI <shishaozhong at gmail.com> writes:

>   Visually, there appears some matching polygons.  Even if two geometries
> represent the same shape visually, they might not be considered equal due
> to tiny differences in precision or metadata.  Have you encountered
> problems of failure of spatial join?  How did you overcome the problems?
> Regards, David

Could you post your example polygons, and the queries you are using?
Your question is much too open ended.  It even sounds like it might be a
request for help with GIS homework, but it's hard to tell :-)