Orthophoto map

Orthophoto map...

Detailed Description

This map uses a satellite image acquired in March 2014 (provided by Digital Globe) as a base at 1:13,000 scale to show the area around the front of the June 27th lava flow. The area of the flow on November 7, 2014, at 3:30 PM is shown in pink, while expansion of the flow as mapped on November 10 at 10:45 AM is shown in red. The latitude and longitude of the front of the narrow finger of lava advancing toward Pāhoa was 19.49590, -154.95256 (Decimal Degrees; WGS84). The dotted blue lines show steepest-descent paths in the area, calculated from a 1983 digital elevation model (DEM). The flow front has not advanced during the last 24 hours. At the time of mapping, the tip of the flow was stalled 155 meters (170 yards) from Pāhoa Village Road, but there were active breakouts on the north side of the flow field 300 meters (328 yards) upslope of the flow tip. Surface activity also continues elsewhere on the flow field. Breakouts on the north side of the flow field range from about 450 meters (492 yards) upslope to 190 meters (207 yards) downslope of AP‘A‘ā Street / Cemetery Road. One of the breakouts is moving northeast and is about 20 meters (22 yards) from the southwest corner fence of the transfer station. A breakout moving northwest from the street has moved onto private property across the street from the transfer station, where it set an unoccupied house on fire at 11:55 AM, HST. A breakout 760 meters upslope of AP‘A‘ā Street / Cemetery Road has sent a narrow finger of lava moving to the northeast. Other breakouts occurred on the north (2.4 kilometers; 1.5 miles) and on the south (1.2 kilometers; 0.75 miles) sides of the flow field upslope of the street. Steepest-descent path analysis is based on the assumption that the DEM perfectly represents the earth's surface. DEMs, however, are not perfect, so the dotted blue lines can be used to infer only approximate flow paths. For calculation details, see http://pubs.usgs.gov/of/2007/1264/.


Image Dimensions: 3300 x 2550

Date Taken: