adams county lidar project “lidar enhanced” soil survey

Adams County Lidar Project

“Lidar Enhanced” Soil Survey

Three Townships Surrounding Quincy

Approximately 112 Square Miles

Background Information

Mapper: Kucera International Inc.;

Willoughby, Ohio

Data processing and base mapping production work were performed from April 2006 through March 2007.

Aerial Photography and LIDAR Dates

• Aerial photos flown on March 15, 2006

• Aerial Lidar Survey flown on April 11, 2006

General Scope of County Project

• Color and black & white digital orthophoto production at 1”=100’ scale with 0.5’ pixel resolution

• Aerial Lidar Survey with DEM production

• 2’ contour topographic mapping

• Limited planimetric feature mapping at 1”=100’scale

Light Detection and Ranging; or Laser Imaging Detection and Ranging

A laser pulse is sent out from a transmitter and the light particles are returned back to the receiver. 

The laser pulses paint the ground very accurately mapping the ground.

LIDAR

LIDAR is a multiple-return LIDAR is a multiple-return system for each laser shot.system for each laser shot.

Captures anything above the Captures anything above the surface, such as forest canopy, surface, such as forest canopy, buildings, power lines, roads.buildings, power lines, roads.

Captures the earth surface.Captures the earth surface.

DEM and DTM• A digital elevation model (DEM) - generally refers to a

representation of the earth's surface (or subset of this), including features such as vegetation, buildings, bridges, etc. The DEM often comprises much of the raw dataset, which may have been acquired through techniques such as photogrammetry, LiDAR, land surveying, etc.

• A digital terrain model (DTM) on the other hand is (generally) a filtered version of this surface, and hence can be a post-processed version of what was originally a DEM. The DTM provides a so-called bare-earth model, devoid of landscape features. While a DEM may be useful for landscape modeling, city modeling and visualization applications, a DTM is often required for flood or drainage modeling, land-use studies, geological applications, and much more.

• (Wikipedia)

Planimetric Feature Mapping

• Stereocompiled

– Building footprints & road centerlines– Hydrology & road edge planimetry– Railroad centerline planimetry

IOWA LiDAR Interactive Mapping Partners

• Iowa Department of Transportation

• Iowa Department of Agriculture and Land Stewardship

• Natural Resources Conservation Service

• The DNR will contract with the U.S.G.S. to gather LiDAR data statewide.