Carolina Bay Survey Maps

The Map show below is interactively driven by a Google Fusion table. The green rectangles identify regions to be surveyed, and link to 1/3 arc-second DEM imagery available at the 1º Quad level. Clicking on one of these placemarks will bring up a bubble with links to return the KML metadata file to your computer for viewing USGS 1/3 arc second DEM hsv-shaded maps within Google Earth.

he next Google Fusion map here identifies 1/4 degree "octants" (yellow & green placemarks) being surveyed for possible Carolina Bay landforms. Due to the numerical count of these landforms in our survey (currently >22,000), we are looking for collaborators who would be kind enough to annotate our Google Fusion Table structure with their observation of bay locations.

The Map next is also interactively driven by a Google Fusion table, and shows the progress of the survey. Yellow placemarks identify octants to be surveyed, and indicate that only 1/3 arc-second DEM imagery is available, while the green placemarks signify that LiDAR-quality DEM imagery has been created for that 0.25degree x 0.25 degree octant. Clicking on one for any of these placemarks will supply the user with the KML file for use in the
Google Earth Application.

The next interactive plug-in map is a hybrid, showing all 48,000 + bays surveyed to date (the small round placemark dots). Clicking on those placemarks will bring up a popup with a link to the relevant KMZ file for downloading into the Google Earth application. Fusion Tables has the ability to sub-set the displays icons to a maximum of 500, keeping the viewer from overloading with too many placemarks. As the viewer zooms in or out, the field of view (FOV) will be updated with a maximum of 500 elements, eventually dropping off as the number of bays in that FOV drops below 500 - at which point all the bays within that FOV will be displayed. The icons are color-coded to indicate the elevation above sea level of that bay’s “floor”, as reported by the USGS’s elevation server at the time of encoding of the metrics.

Note that the plug-in window here does not function like the full Google Earth application would, as you can not load the bay planform overlays from the pop-up links into this window. Instead, the KMZ file will be downloaded to your system for use directly in Google Earth.

These maps are created using a process discussed in our 2011 USGS
National Map Mashathon entry. A detailed slide show of the process is available as a slide show HERE on our site, or can be downloaded as an 18 MB PDF flie.