There are 180 cases of unidentified human remains in BC. These are cases that have been cold for years, some for decades. Ian Charlton, a spatial analyst with BC Coroner's Services at the time, thought by putting the information about the remains on an interactive map he might engage the public and spark some new leads. The success of the map was beyond Ian's expectation. He talked to Guan about the journey and how GIS helped solve a missing person case.