Avineon, Inc., 20040820, Seagrass_2003:, Avineon, Inc., Clearwater, FL.Online Links:
- \\Windex\sjr\irl\projects\seagrass\layers\Seagrass.mdb
This is a Vector data set. It contains the following vector data types (SDTS terminology):
The map projection used is Transverse Mercator.
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 0.001000
Ordinates (y-coordinates) are specified to the nearest 0.001000
Planar coordinates are specified in meters
The horizontal datum used is D_North_American_1983_HARN.
The ellipsoid used is Geodetic Reference System 80.
The semi-major axis of the ellipsoid used is 6378137.000000.
The flattening of the ellipsoid used is 1/298.257222.
Coordinates defining the features.
Sequential unique whole numbers that are automatically generated.
Positive real numbers that are automatically generated.
Positive real numbers that are automatically generated.
Sequential unique whole numbers that are automatically generated.
Coordinates defining the features.
Positive real numbers that are automatically generated.
Positive real numbers that are automatically generated.
Sequential unique whole numbers that are automatically generated.
IRL03_UTM.PAT:
COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME
1 AREA 8 18 F 5
9 PERIMETER 8 18 F 5
17 IRL03_UTM# 4 5 B -
21 IRL03_UTM-ID 4 5 B -
25 HABITAT 16 16 C -
AREA - predefined coverage field.
PERIMETER - predefined coverage field.
IRL03_UTM# - predefined coverage field.
IRL03_UTM-ID - predefined coverage field.
HABITAT - polygons will be annotated using a modification of the Florida Land Use
and Cover Classification System (FLUCCS). The categories to be used are
listed and described below.
FLUCCS code 9116, Seagrass, continuous, dense -- The dominant feature of these
seagrass beds is that they are continuous in nature, with
interconnected areas of seagrass. These beds may contain many
small interspersed patches of sparsely vegetated or unvegetated
bottom, and thus would have a lower limit of about 50 - 60%
cover of seagrass. Only sand patches greater than 0.25 acres
should be distinguished within a continuous, dense bed. Species
composition is not mapped.
FLUCCS code 9113, Areas 0.25 acres or greater in size that consist of primarily
(greater than 50%) bare bottom in which many small patches
(each less than 0.25 acres) of seagrass are scattered, and
where the seagrass patches are not interconnected. (For this
study, the lower limit of what constitutes a seagrass bed is
approximately 10% cover; areas with <10% cover are considered
"unvegetated bottom"
FLUCCS code 5400, Barren substrate with little or no perceptible seagrass (<10%)
or only algae.
FLUCCS code 9121, In a few cases, beds of algae may be distinguishable from
seagrass. Where these areas are identifiable on the photography
AND field checked during field trips conducted for seagrass
mapping they should be mapped (if >10% cover), although this is
not a high priority and there is no intent to accurately map all
algae beds as part of this project. (In some cases, drift algae
will accumulate in seagrass beds. In these cases, the area should
be mapped as seagrass, and the density should be based on seagrass
density only, not algae.)
IRL03_UTM.AAT:
COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME
1 FNODE# 4 5 B -
5 TNODE# 4 5 B -
9 LPOLY# 4 5 B -
13 RPOLY# 4 5 B -
17 LENGTH 8 18 F 5
25 IRL03_UTM# 4 5 B -
29 IRL03_UTM-ID 4 5 B -
All Arc Attribute Table items are predefined by Arc/Info. There is no linear
attribution in this coverage.
Avineon Inc. Photointerpretation Staff- Michael White, Daniel Bubser, Lesley Ward SJRWMD Project Manager- Robert Virnstein SFWMD Project Manager- Becky Robbins
(727)539-1661 (voice)
(727)539-6954 (FAX)
kpatterson@avineon.com
A primary objective of the Indian River Lagoon (IRL) Surface Water Improvement and Management (SWIM) Plan is to protect and restore seagrasses. The IRL SWIM Plan directs the South Florida and St. Johns River Water Management Districts to map seagrasses in the Indian River Lagoon at two to three year intervals. Accordingly, Indian River Lagoon seagrass maps have been prepared for the following years: 1986, 1989, 1992, 1994, 1996, 1999 and 2001.These lagoon-wide maps, based on aerial photographs, provide an overall picture of the seagrass resources in the IRL. These maps serve as important management tools for obtaining a current inventory of this resource, identifying "healthy" areas that may deserve special protection efforts, and identifying potential "problem" areas that require further investigation. The maps can also document large-scale trends in the status of this resource.
Imaging, US, Indian River Lagoon:,.
The values for the points provided from the 1996 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.
Data sources used in this process:
,.Online Links:
Attribute accuracy was tested by visual comparison of the aerial photographs with the seagrass data to ensure consistency with the classification system and photo signatures. Pre-interpretation groundtruthing was also performed to aid in delineation and classification of photo signatures. Additional checks for valid attributes, as defined by the SJRWMD/SFWMD modified FLUCCS, were performed. A classification accuracy assessment was conducted 0n 200 random generated points covering the entire lagoon system the resulting accuracy for this project were 89.5%.
Ground controlpoints were provided by the SJRWMD from the 1996 and 1999 mapping efforts. These points included both GPS survey points and control points collected from USGS 1m DOQQ's. Horizontal positional accuracy of the data meets NMAS for 1:24000 scale maps, approximately +/- 40 feet. Digital linework was reviewed over USGS DOQQ and the 1999 seagrass data. Well defined features on the images and 1999 and 2001 data were inspected for comparison to 2003 linework collected representing those features. GPS points were also collected during 2003 seagrass field work at well defined features and compared against coordinates for the same features on the 2003 data.
Minimum mapping unit for seagrass, algae beds and unvegetated bottom polygons is 0.25 acres. The study area boundary for the project was defined by the SJRWMD. Features were captured and classified according to the minimum mapping unit guideline and the SJRWMD/SFWMD modified FLUCCS.
Polygon and chain-node topology present. NODEERRORS run with Dangle option. No dangles present. UNSPLIT used to remove superfluous pseudo-nodes. LABELERRORS run, with all polygons attributed. RELATE was employed to check for contiguous arcs. No arcs have the same attribute on both sides.
Are there legal restrictions on access or use of the data?
- Access_Constraints: none
- Use_Constraints:
- Acknowledgement of Avineon Inc. would be appreciated in products derived from this data. The positional accuracy of this data meets USGS NMAS for 1:24000 scale maps (+/- 40 feet). A thematic accuracy for interpreted polygons representing habitat was conducted on 200 points with an overall accuracy of 89.5%.
386-329-4362 (voice)
rvirnstein@sjrwmd.com
Downloadable Data
| Data format: | Size: 14.760 |
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727-539-1661 (voice)
727-539-6954 (FAX)
kpatterson@avineon.com