QGIS Techniques Viewsheds & Advanced Calculations

Neil Benny November 2016

So What’s New….

There’s a new QGIS….

thinkWhere’s new advanced QGIS training courses… http://www.thinkwhere.com/ for more info….

Heikki Vesanto thinkWhere 2012 - 2016

Views & How to Analyse them….

More Robust Ways of Doing this….

• R.Viewshed

• Viewshed Plugin

Demonstration….

Advanced Analysis Where is the Centre of Scotland?

West 141602

North 976821

East 414230

South 529982

277916,753401 Near Shiehallion

As with all things, how you frame the question gets more interesting answers.

Population Centre

MEAN LOCATION

Mean Location

This effectively has to be a population weighted average x,y coordinate of the centroid of each individual census output area.

Why the population weighting?

Population Centre

MEDIAN LOCATION

Mean Location

The would be the centre point which divides the Scottish Population into four equal parts

Slamannan Scotland’s Heart