Local developers have introduced an iPhone application that gives users access to reams of public data.Michael Schnuerle and Eric Roland are co-creators of the “Your Mapper” app. Like Schnuerle's website of the same name, the app allows users to see public data on everything from home foreclosures, pollution emissions and political contributions by address. “So if you’re in Old Louisville you can see the crime that happened there the day before or the week before, you can go back in time too," said Schnuerle.There are up to 50 data sets from local, state and national databases. The app detects the user's location and brings up data for the surrounding area. "You can see what sort of construction work is being done on commercial and private residences. You can property values," he said.Schnuerle and Roland have spent the past few months developing and testing the app, which is now available for free at the iTunes store.Schnuerle said he hopes the app can be used as a national model as he continues making modifications.