1) A few days ago, I run "clip" tool on some shapefile.
Green shapefile was obviously full of the area, but after clip process, some regions are lose their area...
Why does this error occur?
2) I edit shapefile in QGIS, for example... In editing mode, I'm edited some object use by tool like "divide object" & "merge selected object"
Before editing, shapefile show me image like lower jpg.
But after editing... QGIS show me image like below jpg.
Result contain sliver...
I run same process in ArcMap, and ArcMap give me a correct result...
Is it just an error in QGIS?