The New South Wales Government Chief Information Office is asking the public what data it wants opened up in an upcoming refresh of the state's public data catalogue.

DataNSW asked for suggestions through a Twitter post last week to over 350 followers.

“Catalogue is due for a refresh. Any ideas?” said the post.

Interested parties are invited to submit their requests through the department's online contact form at data.nsw.gov.au/contact.

The state’s data catalogue was launched in 2009 and makes public sector information available to anyone online.

The recently completed mashup competition, "apps4nsw", provided an example of how government data could be used to make a number of applications, including one that allows users to overlay demographic information of the Australian population onto a map of Australia.