Geographic Information Systems for Public Policy - Lecture IX

Creating and Fixing Vector Data

Sergio Rey

Last Time

  • Working with Vector Data
  • Symbology
  • Classifying Vector Data
  • Color

Today

  • Detecting Geometry Problems
  • Understanding Geometry Problems
  • Fixing Geometry Problems

Detecting Geometry Problems

SCAG Shapefile (Exer 2)

Splitting by Attribute

scag

Splitting by Attribute: Menu

scag

Splitting by Attribute: Dialog

scag

Splitting by Attribute: Error

scag

Processing Toolbox

  • GUI for Processing
  • Native and 3rd Party GIS Algorithms
  • Organized by Provider

Processing Toolbox Menu

scag

Check Geometry Validity

scag

Check Geometry Results

scag

Check Geometry New Layers

scag

Check Geometry Canvas

scag

Invalid Ouptut Layer Table

scag

Understanding Geometry Problems

Self-intersecting Ring

scag

Self-intersecting Ring

  • Problem with area calculations
  • Other GIS operations

Polygon Area

Fixing Geometry Problems

Remove Other Layers

scag

Search for Buffer

scag

Buffer Dialog: Set Distance=0

scag

Buffer Log

scag

Check Validity of Buffered Layer

scag

Check Validity of Buffered Layer

scag

Check Validity of Invalid Output

scag

Check Validity of Invalid Output

scag

Split by Attribute Revisited

Back to original tract layer

scag

Buffer the original tract layer

scag

New Buffered Layer

scag

Check Validity of Buffered

scag

Check Validity of Buffered

scag

Make Layer Permanent

scag

Split Vector Layer

scag

Split Vector Layer: Set Output Directory

scag

Split Vector Layer Results

scag

Split Vector Layer Results

scag

Next Up

  • Vector Analysis

Creative Commons License
GIS for Public Policy’20 by Sergio Rey is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.