[Qgis-user] Problems with clipper and snappin options

[Mariana Buzzi]

Good night people!
I'm making masks that correspond to landscape units (LU). The polygon
corresponds to the LU called pampas. This polygon was done through the
creation of a vector and scanned with mouse function of landscape features
shape. As you can see, my first problem emerges at that I can not cut the
pampa (light blue) with clipper program.
The second problem arises with me snnapping options. I need to do two
polygons .. rudimentary scanning did not want to, but I wanted to use the
snapping options so that the edges are accurate. But I could not.

I hope you can help me.
Thank you.
A big hello from Patagonia.
Mariana
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