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publications > open file report > OFR 2007-1200 > spatial resolution, location and extent

Conceptual design of the Everglades Depth Estimation Network (EDEN) grid

Spatial resolution

Introduction
Conversion Factors
Map projection and coordinate system
>Spatial resolution, location and extent
Cell identifier assignment
Geographic data formats
Grid cell attribution
Data distribution
Acknowledgements
References Cited
Figures
PDF
To match the Airborne Height Finder (AHF) system sample spacing, the spatial resolution or the dimensions (in ground distance) of each grid cell is 400m on each side. The AHF is the helicopter-based high accuracy elevation data (HAED) measuring system that has been used over the past several years to collect Everglades ground surface elevations to an accuracy specification of +/-15cm (Desmond, 2003). These data constitute the foundation for the EDEN grid as nearly 50,000 AHF points will be used to initially assign elevation values to each cell. The 400m spacing for AHF data collection was selected so that ground elevation data were collected at closer intervals than the spatial resolution planned for developing high-resolution hydrodynamic models for sub-regions of the Everglades (Schaffranek, 2001).

Spatial location and extent

The origin and extent of the EDEN grid were selected to cover not only existing AHF data and current regions of interest for Everglades restoration, but to cover a rectangular area that includes all landscape units (USACE, 2004) and conservation areas in place at the time of its development (Figure 1). This will allow for future expansion of analyses throughout the Greater Everglades region should resources allow and scientific or management questions require it. Combined with the chosen extent, the 400m cell resolution produces a grid that is 675 rows and 375 columns (253,125 cells total).

map showing overall extent of the EDEN grid
Figure 1 Overall extent of the EDEN grid is indicated by the large black-lined rectangle. Boundaries of the Everglades landscape units are shown in purple. For scale, USGS 1:24,000 quadrangle boundaries are shown in light yellow. Major highways are shown in red and yellow. Both minor roads and county boundaries are depicted using light grey lines. [larger image]

< Map projection and coordinate system | Cell identifier assignment >



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Last updated: 13 September, 2007 @ 01:58 PM(KP)