Trace Plots from Master Plan

• 1.) Go to Settings -> Snapping Options... In the dialog box, make the following changes:
• Snapping mode: all layers
• Snap to: To Vertex and segment
• Tolerance: 10, pixels

• 2.) In the Attribute table dialog box, click on "Add field". In the dialog box, make the following changes:
• Name: plot_ratio
• Type: Decimal number (real)
• Length:2
• Precision:1

• 3.) Right click on the "punggol_buildings" layer -> Save as... Save the layer as "punggol_plots" (Refer to Chapter: Extract OSM map to QGIS Step 9 on how to export a layer).
  • i.) click on the "punggol_plots" layer.
  • ii.) click on the "Open Attribute Table" icon.
  • iii.) click on the "Toggle Editing Mode" icon.
  • iv.) Use the keyboard shortcut key "Crtl + a" to select all rows in the attribute table. Click on "Delete selected feature".

• 4.) Trace the plots. Make sure the punggol_plots layer is below the punggol_buildings.
  • i.) Select the punggol_plots layer. Click on the "Add Feature" icon.
  • ii.) Trace the plot, right click when done tracing. Fill in the plot_ratio and landuse attributes according to the master plan. The legends of the master plan can be downloaded from the URA website.
  • iii.) Input one of this pre-specified landuse categories to describe the landuse:
  • residential
  • transport
  • recreation_ground (all parks and open space are labelled as recreation_ground)
  • education
  • commercial
  • civic
  • mixed
  • place_of_worship
  • reserve
  • utility
  • health

• 4.) Adjust the punggol_buildings layer according to all the overlays of shapefiles.
  • i.) Trace missing buildings from the OSM layers according to the master plan.
  • ii.) Remove redundant buildings.
  • iii.) verify the information with other sources, such as google earth.