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 10, 2014, at 10:45 AM is shown in pink, while widening and advancement of the flow as mapped on November 12, at 7:00 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 tip of the flow is not active, but there are active breakouts on the north side of the flow field about 400 meters (437 yards) upslope. The flow tip is 155 meters (170 yards) from Pāhoa Village Road. Surface activity also continues elsewhere on the flow. Surface breakouts on the north side of the flow field range from about 435 meters (475 yards) mauka to 440 meters (481 yards) makai of the AP‘A‘ā Street. One of the breakouts is moving northeast and inside the fence of the Transfer Station. A breakout moved northward along AP‘A‘ā street and eastward onto a property, destroyed a house, continued northeast and has reached 270 meters (295 yards) makai of AP‘A‘ā Street. A breakout 760 meters (831 yards) mauka of AP‘A‘ā Street has continued to move northeastward and has flowed to within 375 meters (410 yards) of AP‘A‘ā Street. Other breakouts continued to flow on the north (2.4 kilometers; 1.5 miles) and on the south (1.2 kilometers; 0.75 miles) sides of the flow field. 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: