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 as mapped on November 12 and 13, 2014, is shown in pink, while widening and advancement of the flow as mapped on November 14, at 1:40 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). At the time of mapping there were active breakouts on the north side of the flow field 700 meters (0.4 miles) upslope 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 230 meters (250 yards) to 2.7 kilometers (1.7 miles) mauka of AP‘A‘ā Street. The breakout that has been the most active in the past few days is approximately 230 meters (250 yards) mauka of AP‘A‘ā Street. Other scattered breakouts on the south side of the flow range from 230 meters (250 yards) to 1.2 kilometers (0.75 miles) along the flow margin mauka of AP‘A‘ā 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/.

Details

Image Dimensions: 1056 x 816

Date Taken: