8.3.8.1 Quality-Control
Level of expertise required for this Chapter: Advanced; specifically for LUPMIS @ TCPD
Automatic check of following features are made for GIS files:
- Feature types (should contain only polygons or lines or points or text, but not a combination of those)
- Local Plans should have only polygons
- Invalid labels or ids
- Plans should have a planning zone (style)
- Streetlines should have unique names and not be broken
- Local Plans should have a UPN
- Coordinate system should be valid (GTM or UTM)
- No duplicate features should exist
- No micro polygons or micro gaps should exist in polygon maps
- Vertex points should be snapped in polygon maps
- Local Plans should have an address (street name and property number)
- Local Plans should not have more than 6000 parcels
- Detection of label points in polygon maps, which are outside of the polygon
- Identification of polygons, which are not correctly 'snapped' and form overlapping or missing areas (semi-automatic)
- Complete with addresses (for Local Plans)
- Complete with UPN (for Local Plans)
- Complete with planning zones (for Local Plans)
This QC check can be invoked through Processing Tools > Other GIS Tools > Quality-control of GIS file > Select file > Select type of check (there are basic and complete tests) > Execute:
The check will either show failure:
or passing:
To show the location and easy fix, 'Error maps' are generated at the end of the quality-control process, with dots either in the centre of a feature or at the polygon boundary (actually, 1.vertex) of the failed parcel.Different colours (in different GIS files) indicate the problems. For example:- Brown: Small sliver polygons
- Red: Wrong features (e.g. lines in a polygon map)
- Green: Missing planning zone (style)
- Blue: Missing address/street name
- Yellow: Missing UPN
- Purple: Micro polygons
- Magenta: Labels outside polygons