Attempted to extract raster by mask layer in QGIS 2.18.15 and for one of my shapefiles, the command could not be executed. The error message reads "Warning 1: Ring Self-intersection at or near point 97.520362854004077 18.494590759277401 ERROR 1: Cutline polygon is invalid."
In trying to correct this 1 error, I have tried the following
- (1) added a zero distance buffer using QGIS default plugin
- (2) added a zero distance buffer using GRASS v.buffer.distance
- (3) used multiple permutations of GRASS's v.clean & v.clean.advanced
But none of the above has rectified this issue i.e. when I run the Check Validity function, the error still persists. I have browsed through several threads within this forum but their solutions don't seem to work for me.