The Sidwell Company Unpublished Material Unknown remote-sensing image The Sidwell Company Unknown Unknown The LiDAR data for this Jefferson County, Illinois auto-generated 2 foot contours project was acquired on March 09, & March 10, 2012 with a Leica Aerial LiDAR Sensor. The LiDAR data was delivered in 632 LAS tiles and 12 blocks of 2foot contour data in .dwg file format. The project coordinates are in Illinois State Plane, East Zone, North American Datum (NAD) 1983 with the elevations based on Mean Sea Level (MSL) North American Vertical Datum (NAVD) of 1988. The purpose of this LiDAR project is to update the land topographics for the entire county. 20120425 unknown 20120430 unknown ground condition Complete As needed -91.349666 -91.342460 39.758308 39.752746 LiDAR LiDAR Auto Generated 2 foot Contours LiDAR Light Detection and Ranging Bare Earth Topography Contours Jefferson County Illinois IL UNKNOWN UNKNOWN The Sidwell Company POC Arron Lee Manager of Photogrammetry physical and mailing address

675 Sidwell Court

St Charles Illinois 60174 USA 630-549-1019 alee@sidwellco.com Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.1850 The LiDAR data was post-processed and a QA/QC performed to be consistent with the project requirements in terms of post spacing and the absence of artifacts. The point cloud underwent classification to determine bare-earth points and non-ground data. NONE 100% Complete 30 GPS measured ground control points were targeted along the perimeter and within the project area to control the LiDAR dataset. The project coordinates are in Illinois State Plane, East Zone, North American Datum (NAD) 1983 30 GPS measured ground control points were targeted along the perimeter and within the project area to control the LiDAR dataset. The vertical datum used for the project was referenced to NAVD 1988 in US Survey feet. The Sidwell Company Unknown Unknown External Hard Drive 2012/04/25 unknown 2012/04/30 unknown ground condition Contours LiDAR Adquisition: LiDAR data was acquired on March 09, & March 10, 2012 with a Leica ALS-50-II LiDAR Sensor along with an IMU and AbGPS receiver at an average post spacing of 1.4 meter. The LiDAR data was collected to be capable of supporting 1” = 100’ scale 2-foot and 5-foot contour generation. LiDAR data acquisition occurred in leaf-off conditions when the sky was sufficiently clear of clouds, smoke, and atmospheric haze. The LiDAR data was processed immediately after the acquisition to verify the coverage had no voids. 2ft-Contours_Tile_Layout.xml 20120429 13110000 None Vector G-polygon 6384 Transverse Mercator 0.999941 -90.166667 36.666667 2296583.333333 0.000000 row and column 0.500000 0.500000 survey feet North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 2ft-Contours_Tile_Layout shapefile LiDAR The Sidwell Company Arron Lee Manager of Photogrammetry mailing and physical address

675 Sidwell Court

St. Charles Illinois 90174 USA 630-549-1019 630-549-1111 alee@sidwellco.com 8 pm - 4:30 pm Downloadable Data NONE shapefile 1 Unknown NONE unknown 20120429 The Sidwell Company Arron Lee Manager of Photogammetry mailing and physical address

675 Sidwell Court

St. Charles Illinois 60174 USA 630-549-1000 630-549-1111 alee@sidwellco.com 8 am - 4:30 pm FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time http://www.esri.com/metadata/esriprof80.html ESRI Metadata Profile http://www.esri.com/metadata/esriprof80.html ESRI Metadata Profile