OKLAHOMA CITY, Okla., – Lemke Land Surveying, an Enviro Clean company, hosted free GIS demonstrations at this years’ Oklahoma Oil & Gas Expo. The demonstrations were conducted by Lemke’s own, Gary Smith, Director of Geographic Information Systems. Smith has over 25 years of GIS experience and routinely prepares custom GIS solutions for small, independent oil and gas operators. The Oklahoma Oil & Gas Expo is the largest event of its kind in Oklahoma and is the only one organi