|
Supplementary material to “Improving Stream Studies With a Small-Footprint Green Lidar”
Published 29 September 2009
Jim McKean and Dan Isaak, Rocky Mountain Research Station, U.S. Forest Service, Boise, Idaho
Wayne Wright, Florida Integrated Science Center, U.S. Geological Survey, St. Petersburg
Citation:
McKean, J., D. Isaak, and W. Wright (2009), Improving stream studies with a small-footprint green lidar, Eos Trans. AGU, 90(39), 341–342. [Full Article (pdf)]
The supplementary materials illustrate several other important components and capabilities of the EAARL system. The technical specifications of the main sensors are shown in Table S1. The EAARL sensor package includes color and high-resolution digital color-infrared (CIR) cameras. An example of the combined CIR data and green laser bathymetry is shown in Figure S1. Further information about the instrument package can be retrieved from: http://ngom.usgs.gov/dsp/tech/eaarl/.
EAARL data are processed using the Airborne Laser Processing Software (ALPS) implemented in the Linux operating system and run on PCs. Data can be processed under contract to the USGS or users can receive ALPS training and process their own data.
An ArcGIS tool is under development that will automatically extract common hydrologic and ecologic measures of channels from high resolution bathymetric data produced by any method. The hydrologic metrics include standard characteristics measured at specific channel locations; e.g. width/depth at any flow stage and stream gradient. The aquatic habitat measures will include features such as the locations and volumes of pools and the surface areas of “off-channel” habitat still connected to the main channel at any flow stage. Figure S2 is a preview of this tool which will be freely available from a website when completed in mid-2010.
Table S1 Reference:
J. McKean, D. Nagel, D. Tonina, P. Bailey, C. W. Wright , C. Bohn, A. Nayegandhi Remote Sensing of Channels and Riparian Zones with a 7 Narrow-Beam Aquatic-Terrestrial Lidar
Remote Sens. 2009, 1, 1-x manuscripts; doi:10.3390/rs10x000x 1
Figure S1. Example of EAARL bathymetry and color-infrared photography. Left panel is from the digital color-infrared camera. Right panel has lidar-generated bathymetric contours overlaid on color-infrared data. Bathymetric contour interval is 30 cm for clarity; data normally support a 20 cm contour interval. Camera resolution is ~15 cm.
Figure S2. ArcGIS toolkit graphical user interface for automated interrogation of high-resolution aquatic-terrestrial digital elevation models (DEMs). Cross-sections of the channel are extracted at user-defined locations and hydraulic geometry measures are calculated and stored as metadata. Data and graph in the inset figure are from the cross-section identified by light blue line on the channel map. Other cross-section locations are shown in red lines.