5. Lab

Created Monday 10 November 2014 - Map Class

Available Data to experiment

• Bangalore Data (Ward maps, BBMP election results, census data at BBMP level)
• BMTC Data (Bus stops and routes)
• BWSSB data (Water boundaries)
• PC and AC data, Election results

DO

• Conversions
  • Address to GeoCode
    • GeoNames API
    • In Google Docs
    • Google Places API
  • GeoCode to Address
  • Raster to Vector
    • Raster to Vector is straight forward if the raster image has gis info ex: GeoTiff
    • GeoReferecing
  • Vector to Raster
    • Vector to Raster is easy
  • Expore different type of map file formats and conversions within QGIS or on web

• With QGIS or Leaflet
  • Simple Choropleth or On Google Maps or On Leaflet
  • Plotting points, lines and polygons
  • HeatMap QGIS or Leaflet BBMP maps or

• GIS DB & GIS functions
  • Find center of Polygons
    • Go to the menu -> Vector -> Geometry tools -> polygon centroid and create a centroid point layer
  • Find if a point is inside a polygon (which ward do i belong)
    • Intersect between points layer polygon layer
    • Join attributes by location
    • Add polygon attributes to points
    • Terraformer JS script
    • SpatialLite DB (spatialite_gui)

select * from BBMP_wards_2011_region 
where  
ST_Within(ST_GeomFromText("POINT(77.59456269966904 12.971598700795482)"),Geometry)

• Difference between layers
  • Old BBMP
  • New BBMP

• Intersection (common area)
  • BBMP
  • Pincode