2018 | Richard Carstensen | 2 geoPDFs

High-resolution GeoPDF pair for field navigation on the Airport Dike Trail and adjacent tidal wetlands. Also shows coastline on the Sayéik (Douglas) side. In apps such as Avenza, on your phone or tablet, you can see your GPS/cell-triangulation position on this image, and lay a track.

First choice below is a LiDAR-derived bare-earth hillshade with modeled streams and 2-foot contours. Other layers, exported from ArcMap, are named roads and hiking trails, and our wetland units from the CBJ wetland survey project. Thick blue lines are “subsheds,” also mapped during that project. The bold blue line at Extreme High Water outlines spoil islands from dredging of the channel in the 1960s. Upper limits of the green tint at 32 feet show maximum tidal incursion at peak Little Ice Age.

The second choice is a 2013 orthophoto with overlain streams and trails. More information on geoPDFs and use of Avenza is at Media types>Maps&geoPDFs., and at Tools>Field navigation.

Download hillshade geoPDF here (9MB)

Download aerial geoPDF here (13MB)