Flow front map at 1:12,000 scale

Flow front map at 1:12,000 scale...

Detailed Description

This map uses a satellite image acquired in March 2014 (provided by Digital Globe) as a base to show the area around the front of the June 27th lava flow. The area of the flow on October 26, 2014, at 12:30 PM is shown in pink, while widening and advancement of the flow as mapped on October 27 at 11:30 AM is shown in red. The dotted blue lines show steepest-descent paths in the area, calculated from a 1983 digital elevation model (DEM). The flow advanced about 180 meters (200 yards) during the preceding 23 hours, and reached thick vegetation beyond the northeast edge of the lush pasture that the flow had been traversing. At the time of mapping, the flow was 540 meters (590 yards) directly upslope from Pāhoa Village Road. The latitude and longitude of the front of the narrow finger of lava advancing toward Pāhoa was 19.49307, -154.95469 (Decimal Degrees; WGS84). Though not shown on this map, the flow advanced an additional 30 meters (33 yards) by 4:30 PM. 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: