The changing nature of violence in Sydney's CBD since the introduction of the NSW government's lock-out laws is now there for all to see.

The NSW Bureau of Crime Statistics and Research on Friday used data collated for a full year since the 1.30am lock-out and 3am last drink laws were implemented to create two heat maps.

A night in Kings Cross after the lock-out laws were introduced. Credit:Wolter Peeters

The first shows assault hotspots over the year before the changes came into place. The second shows the violence hot spots in the 12 months since the laws have been in place.

They show a decrease in density of assaults on Sydney's George Street, in the Rocks and on Oxford Street. Violence has also decreased slightly in Kings Cross and Woolloomooloo.

The maps reveal an increase in violence density in Pyrmont and in sections of Surry Hills and Redfern, all areas which fall outside the government's lock-out zone.