Seagrass cover type boundaries were photogrammetrically digitized using CadMap/dgn software in conjunction with ISSD, running on Pentium workstations with Windows 2000. This software directly captures digital data into MicroStation (Bentley Microsystems, Inc.) for later importation to ARC/INFO.
Photointerpreters utilized previously collected field data along with other available collateral data to assist in their interpretation. Throughout the photointerpretation process, positional accuracy of seagrass boundaries was maintained according to the photographic signatures apparent on the photography. The minimum mapping unit for classification is 0.25 acres (=0.1 hectares). The horizontal accuracy of the data meets NMAS for 1:24,000 scale maps (+/- 40 feet). A thematic accuracy assessment was performed on this dataset. Pre-interpretation groundtruthing was also performed on the aerial photography, 75 field points.
The values for the points provided from the 2006 project were expressed as geographic coordinates (latitude/longitude), NAD83, Feet. The values for the points collected from DOQ were expressed in UTM coordinates, NA83, Meters. All coordinates were transformed; using a conversion program called Corpscon, to Stateplane coordinates, NAD83, Feet.