This LiDAR data is within Illinois Department of Transportation District 1 and includes McHenry County, Illinois. The data is updated from its original format to LAS version 1.2. The LiDAR data was collected in April 2008 as 'McHenry Co., IL LiDAR' and was Task Order Number: 3. Data was acquired by Quantum Spatial as project 1080208 with an Optech ALTM 3100 sensor equipped with an inertial measuring unit (IMU) and GPS receiver. The acquisition was to produce bare earth ASCII, LAS data and 2 foot contour Shapefiles.