Dalton Flooding information from TerraSAR-X

Detecting River Changes SAR imagery can be used to assess changes in a river’s position even in snow or icy conditions. X-Band SAR can penetrate dry snow Required air temps <20ºF River ice typically provides a strong return due high surface roughness The vertical displacement of a river bank makes it easier to delineate the land/water boundary GeoNorth, LLC confidential

TerraSAR-X Overview res. 18 m 100 x 150 km² Detailed maritime monitoring & detection ScanSAR res. 3 m 30 x 50 km² Detection & classification of vessels, infrastructure, etc. StripMap SpotLight res. 1 m 10 x 5 km² Recognition of objects (airplanes, hangars, vessels,..) Staring Spotlight Staring SL res m 4 x 3.7 km² or 2.5 x 7.5 km², Identification of objects Wide SC res. 40 m 200 – 270 x 200 km² Large area maritime monitoring of traffic, oil spills, sea ice,.. Wide ScanSAR Multiple Collection Modes

Image Info TerraSAR-X Collected April 8, 2015 StripMap Mode Product Resolution ~3m EEV Processing Geo-referenced, terrain correction applied HH Polarization Historic Electro-Optical Image 1.5m SPOT 6 Collection date: September 9, 2014 GeoNorth, LLC confidential

Section 1 Section 2 Section 3 Section 4 Section 5

Section #1 GeoNorth, LLC confidential Dalton Highway Standing water and/or smooth ice Water likely over running the roadway ~750m

Section #2 GeoNorth, LLC confidential Dalton Highway Standing water and/or smooth ice Water likely over running the roadway Standing water and/or smooth ice Unknown Feature, possibly a berm or dike ~700m

Section 3 & 4 GeoNorth, LLC confidential Dalton Highway Water on roadway, roadway likely washed out Water on roadway Roadway may be washed completely away (~200m) Standing water and/or smooth ice

Section 5 GeoNorth, LLC confidential Dalton Highway Water on roadway Standing water and/or smooth ice Other roadway