Carolina bay Survey
A detailed Carolina bay survey (Survey) has been underway since 2010 [1]. Our motivation is to socialize the bays - for the pressing ecological reasons, but also to encourage scientists to consider research into how they were created. All our Survey work product is provided freely on the web. Quadrants of 1º x 1º are the upper gridding elements, and are geospatially accessible through 1ºx1º DEM Map the Google Fusion map shown here, and loadable into a browser using link Clicking on a tile will yield a link to a low-resolution DEM for the Google Earth app, where a placemark popup will yield all survey information for that quad. To deliver reasonably sized LiDAR DEMs, we have subdivided each quadrant into 16 sub-grids. Imagery layers are 1ºx1º Index supplied interactively from our cloud service as required by the user’s field of view.

A live geospatially hyperlinked map, generated by the Google Fusion table facility (below), can also be opened in an independent browser window (LINK) to locate and inspect all 51,000 + bays surveyed (the small round placemark dots). Clicking on a placemark raises a popup with a links to KMZ files for visualization on the Google Earth virtual globe. 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.

As an example of the statistical studies that can be made from the Survey data, an inverse distance weighted (IDW) interpolation of bay orientations on the East Coast is shown below. The false-color map demonstrates the clockwise rotation of major axis when traveled north to south. When geophysical mass flows are modeled to consider ballistic trajectories over a rotating globe, our analysis suggests the orientations can be triangulated to the Michigan LP [2].

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