The check geometry tool is nice but it is lacking an option to output the problematic coordinate locations. How is someone supposed to fix self-intersecting polygons when it does not report the suspect coordinate?
Comparing this tool to other 3rd party or open source tools they seem to be able to report the problem very accurately running specific methods.
Example:
org.apache.solr.common.SolrException: Couldn't parse shape 'POLYGON ....
because: com.spatial4j.core.exception.InvalidShapeException: Ring Self-intersection at or near point (-xxx.xxxx, xx.xxxx, NaN)