geodev-hackerlabs

Smart Mapping - Proportional Styling

Smart Mapping provides some powerful ways to style your data on the map in a way that highlights the data’s properties.

In this lab you will see how we can display population totals as a population density by dividing the totals by area.

Steps

1. Go to www.arcgis.com and login.

2. Click this map and open it in the Map Viewer. Or just continue using your own map from the last step.

3. Click PDX Neighborhoods Enriched > Change Style.

   1. 1. Choose to show Total Population in the drop-down.

   Notice how the neighborhoods are automatically re-styled.

   1. 1. Click Options on Counts and Amounts.
   2. In the Divided by dropdown, select Area.

   See how many of the neighborhoods that were previously highlighted fade slightly to maintain focus on densely populated neighborhoods. Note, the Area values are in Square Miles.

   1. Click OK.

   2. Click DONE.

Your map should look something like this map.

Bonus

• In the Change Style > Counts and Amounts > Options panel:
  • Drag the sliders up and down the color-ramp to see how the visualization changes to highlight extremes or just deviations from the mean.
  • Use the Theme dropdown and the Symbols panel to view the data in other ways:
    • Highlight high and low population densities with the Extremes theme and see how the distribution sliders change the focus of the map.
    • Select different color ramps in the Symbols panel.
    • Use the Invert color ramp icon in the Symbols panel.
  • Select Classify Data and play with the options to see how this alters the style.
    • Set the Round Classes option to 1000 to see how the classifications and classification legend changes.
    • Click on Legend and edit the lowest class to read Under 2,000 per square mile (assuming it previously read 0 to 2,000).