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 3, 2014, at 11:30 AM is shown in pink, while widening and advancement of the flow as mapped on November 5 at 1:00 PM 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 has not advanced during the last 24 hours. At the time of mapping, the tip of the flow was stalled, but two days ago there was an active breakout on the north side of the flow field 130 meters (140 yards) upslope of the flow tip. As of today that flow has not moved. The tip of the flow was 155 meters (170 yards) from Pāhoa Village Road. pāhoehoe flows did not move significantly closer to the two story structure along the southeast margin of the flow. Surface activity also continues elsewhere on the flow. A surface breakout behind the flow front about 115 meters (125 yards) makai of the Cemetery. Breakout activity, mauka of AP‘A‘ā street, occurred along the north margin of the flow at 335 meters (366 yards), 2.5 kilometers (1.5 miles) and along the south margin at 1.2 kilometers (0.75 miles). 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: