Survey Results based on USGS 100K Quadrants
A detailed survey of all Carolina bays is underway here. The map below identifies the 1/4 degree “octants” populated by LiDAR-quality imagery. These efforts are being undertaken to expand on the LiDAR imagery available in the predecessor “Fields” project. A more detailed review of the comprehensive collaborative bay-level survey is discussed in our sister web site HERE.
The Map show below is interactively driven by a Google Fusion table, and shows the progress of the re-building efforts. The green rectangles identify octants to be surveyed, and link to 1/3 arc-second DEM imagery available at the 100K Quad level.
The Map show below is interactively driven by a Google Fusion table, and shows the progress of the re-building efforts at the Octant level of detail. Yellow placemarks identify octants to be surveyed; while the green placemarks signify LiDAR-quality DEM imagery has been created for that 0.25º x 0.25º octant. Clicking on one for any of these placemarks will supply the user with a starter KML file to work with.
Chart displays the distribution of bays by their size
A Google Fusion map is available HERE, which displays all currently surveyed bays.
Structure of the KML File
Each 100K USGS Quadrant is described in a kml file named with our latitude and longitude derived name. The number is composed of the number of 0.5º grids north of the equator concatenated with the number of 1.0º grids east of the Prime Meridian. The following graphic show the DOM of Google Earth Elements in a given survey 100K Quadrant ( Florence ), including the eight Octants and contents thereof. The Octant naming system is similar to that of the 100K quads, but with a 0.25 degree grid. LiDAR is available as either “full”, or “part”, in which the overlay drops out when below ~3KM eye altitude. This makes comparing bay planforms in the LiDAR with its visual presence in Google Earth’s satellite imagery easier. The 4-digit “bay” number (vvhh) is similarly derived from the latitude and longitude, this time referencing 100 vertical grids and 100 horizontal grids (10,000 possible locations within each octant) in which the bay’s central point lies. Each bay is described in the DOM by a named folder containing a named placemark and a named overlay. This structure allows for a user to click on a placemark to edit the overlay, as the DOM tree will move to and highlight the selected bay. This becomes useful when an Octant contains several hundred bays.
Google Earth DOM
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