Submerged Aquatic Vegetation of Coastal Alabama - Fall Polygon Data (MBNEP Survey 2015)

Dataset extent

This data set consists of digital vector data describing the location and species composition of submerged aquatic vegetation in coastal Alabama during fall 2015, including Mississippi Sound, Mobile Bay, Mobile-Tensaw Delta, Little Lagoon, Bay La Launch, Perdido Bay, and their communicating tributaries. The data set includes 1,068 orthophotograph frames and a MrSID mosaic produced from digital aerial imagery acquired on October 10 through 15. SAV was concentrated in upper Mobile Bay and the Mobile-Tensaw Delta, Mississippi Sound, and the Perdido Key area of southeast Baldwin County. Most of the 2015 SAV acreage occurred in the lower Mobile-Tensaw Delta, particularly in the Bridgehead Quadrangle, which contained 63% (4,984.8 ac) of the total 7,923.1 acres mapped. Other areas of substantial acreage included the Mobile Quadrangle (929.2 ac) in the Delta and the Grand Bay Quadrangle (413.5 ac) in Mississippi Sound. 60 percent of the total SAV acreage (4,792.0 acres) was mapped as continuous (>50%) coverage. Overall, there were 1,201.2 fewer acres mapped in fall 2015 than in the 2015 summer survey. The decrease was mostly due to a 920.2-ac decrease in the Bridgehead Quadrangle and a 203.1-ac decrease in the Daphne Quadrangle. In addition to a fall decrease in the overall extent of SAV, there were changes in the proportion of patchy SAV in fall (40%) compared to the summer (22%), particularly in upper Mobile Bay and the lower Delta, Of the 28 habitat categories, most were comprised of mixtures of species occurring in oligohaline systems of the study area.

Data and Resources

Additional Info

Field Value
Author Mimi Tzeng
Maintainer data@disl.org
Last Updated July 22, 2022, 22:52 (UTC)
Created July 22, 2022, 22:52 (UTC)
Content Create Date 2016-09-01
ISO.author Barry A. Vittor and Associates, Inc.
ISO.custodian Roberta Swann <mbnep@mobilebaynep.com>
ISO.originator Quantum Spatial, Inc.
ISO.pointOfContact Mimi Tzeng <metadata@disl.org>
ISO.principalInvestigator Barry A. Vittor and Associates, Inc.
ISO.publisher Mobile Bay National Estuary Program
ISO.resourceProvider Roberta Swann <mbnep@mobilebaynep.com>
Place Keywords Dauphin Island Sea Lab, DISL, Mobile Bay National Estuary Program, MBNEP, Alabama, Mobile County, Baldwin County, Mississippi Sound, Mobile Bay, Mobile-Tensaw Delta, Little Lagoon, Bay La Launch, Perdido Bay, Perdido Key
Temporal Begin 2015-10-10
Temporal End 2015-10-15
Theme Keywords submerged aquatic vegetation, SAV, species composition, coastal habitats
Use Constraints Acknowledgment of the Dauphin Island Sea Lab (DISL), Mobile National Estuary Program (MBNEP), Alabama DCNR State Lands Division - Coastal Section, and Barry A. Vittor and Associates, Inc. is required in products developed from these data, and such acknowledgment as is standard for citation and legal practices for data source is expected by users of these data. Users should be aware that comparison with other data sets for the same area from other time periods may be inaccurate due to inconsistencies resulting from changes in mapping conventions, data collection, and computer processes over time. The distributor shall not be liable for improper or incorrect use of these data, based on the description of appropriate/inappropriate uses described in the metadata document. These data are not legal documents and are not to be used as such.
spatial { "type": "Polygon", "coordinates": [ [ [ -88.401933, 30.829179 ], [ -87.449668, 30.829179 ], [ -87.449668, 30.228693 ], [ -88.401933, 30.228693 ], [ -88.401933, 30.829179 ] ] ] }