Make Layer Valid
It is
accessible through:
Tools > Make Layer Valid...
The Make Layer Valid is used
to
try to correct the geometries of a layer. Valid/corrected
geometries
are saved in the first output file. Those that still invalid
after
this process are saved in the second output file (it can be empty
at
the end). Thus, the user can safely observe and decide what to do
with
these geometries.
Under the "Operation" tab :
- Input data:
Select
the layer that will be analyzed (Only vector layers).
- Define a name for the first layer where the
valid geometries will be stored.
- Define a name for the second layer where the invalid
geometries will be stored.
Under
the "Options" tab :
- Output geometry type: The
output geometry type will be automatically detected if this
field is left blank. Depending on the input data
source/geometry type the output geometry type must be set
manually. Example: Given an input shape file data set of
polygons/multi-polygons the output geometry type must be set
to "PolygonType".
Once
all the input parameters were set, to execute the operation:
- Click on

- Click Yes to add the layer to the TerraView Project. (Most of
the time the second layer will be empty, so remove it).
The vertical tab Report
give you a summary of the operation.