Seagrass_1943

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Title: Seagrass_1943
Geospatial_Data_Presentation_Form: vector digital data
Online_Linkage:
\\palfile\sjrx\ES\IRL\projects\seagrass\layers\Seagrass_1943.shp
Description:
Abstract:
DATA LINEAGE REPORT

DATA LAYER: Seagrass-Indian River Lagoon-1943 LOCATION: Library Index24
NAMING CONVENTION: Seagrass43
DATA TYPE: polygon MAP TILE: 7.5 Minute Quad
SOURCE SCALE: 1:20,000 with some variation DATUM: HPGN, GRS1980 Spheroid
MAP PROJECTION: UTM, Zone 17
MAP UNITS: Meters
LAST TEXTFILE UPDATE: June 8, 1998
SOURCE MEDIA: 1943-44 Soil Conservation Service B & W Aerial Photos
DATE OF SOURCE MATERIAL: 1943 - 1944
CREATOR: Dynamac Corporation, under District Contract #95w205 DERIVATION METHOD FOR DATA: Photointerpreted
DATE OF DIGITIZATION:
DISTRICT COVERAGE STATUS: Complete, IRL basin, within District boundaries
COVERAGE: Indian River Lagoon - from Ponce DeLeon Inlet to District boundary at Indian River/St. Lucie County boundaries
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METHODS: Direct interpretation of the 1943 aerial photography was used to map 1943 seagrass (submerged aquatic vegetation-SAV). The black and white aerial photographs (1:20,000-scale) were provided by Soil Conservation Service (SCS). Additional prints were purchased to complete aerial coverage of the entire project area. All photos are in the District Photo Library. Individual photograph frames were registered to 7.5 minute USGS quads using Bausch and Lomb Zoom Transfer Scope. Mylars illustrating the 1990 shore line were overlaid on each USGS quad. A blank sheet of mylar was overlaid on top of the shoreline mylar and USGS quads, and 1943 shoreline polygons were delineated and labeled directly from aerial photographs onto the mylars. The mylars then were proofed and edgematched to the surrounding quads before digitizing. SAV polygons were classified based on density and a confidence code used to define interpreter's confidence in the SAV density. Refer to tables below: SAV codes used for interpretation of 1943 photography. Code# SAV Shoreline --------------------------------------------------------- 0 None Water 1 Patchy Seagrass Water 2 Dense, Continuos Beds of Seagrass Water 3 Unknown Water 4 Potential Emergent Marsh Water 1943 photography interpretation confidence codes. Confidence ('savconf' item) --------------------------- 1 Low 2 Moderate 3 High The 1943 hand-drawn SAV and shoreline mylars were digitized separately to allow the same 1943 shoreline coverage to be used for both 1943 SAV and 1943 shoreline coverage. The digitizing steps were as follows:
1) Register mapping mylar. 2) Digitize using standard configuration. 3) Label SAV code. 4) Add confidence item to the coverage labels. 5) Edgematch coverage to surrounding coverages. The final SAV coverage was then unioned with the 1990 shoreline coverage. A "savshore" item was added. This item was calculated by summing the 1990 shoreline label values with the 1943 SAV label values. This summation resulted in the final SAV codes. Refer to table below: Seagrass codes (item "savshore") ----------------------------------------------------------------------------------- SAV Item Shoreline ----------------------------------------------------------------------------------- 1943 1990 Savshore SAV code Description code Description -------- --- ---- ----------- ---- ----------- 0 None 0 Water 0 Water 1 Patchy Seagrass 0 Water 0 Water 2 Dense, Continuos Beds of Seagrass 0 Water 0 Water 3 Unknown 0 Water 0 Water 4 Potential Emergent Marsh 0 Water 0 Water 10 None 0 Water 10 Land 11 Patchy Seagrass 0 Water 10 Land 12 Dense Continuos Beds of Seagrass 0 Water 10 Land 13 Unknown 0 Water 10 Land 14 Potential Emergent Marsh 0 Water 10 Land 40 None 40 Land 0 Water 50 None 40 Land 10 Land NOTES:
Because of the poor water penetration of black and white photography, seagrass beds in deep water were not detectable. Seagrass bed edges were therefore delimited only where seagrass could be visually identified. As a result, a confidence item value of 1 was given indicating uncertainty in the coding of 0 or 10 for the SAV item. It should be noted that for sections of the lagoon, where SAV item was marked 0 or 10 with a confidence item of 1, does not imply there was no SAV. This combination implies that SAV could not be detected by the photography. In sections of photography where the bottom could be seen without the SAV, a coding of 0 or 10 was labeled along with a confidence item of 2 or 3.
There is an item in the attribute table 'DEN43'. Ron Brock Meyer spoke to Dr. Robert Virstein and reviewed the features involved. These polygons are in Mosquito Lagoon in an area that is substantially deeper than where seagrass was present then or now. After looking at all available information, it was decided that these were not likely to be seagrass, but rather more likely to be drift algae. The code was added to indicate our uncertainty...and our "feeling" that it was more likely drift algae. Considering this was done from 60 year old black and white photography and that there was obviously no chance to ground truth, it was our attempt to correct what we thought was miscoded. DATE OF QA: May/June 1998
METHOD OF QA: The coverages were received in batches on a 8mm tape. The coverages were in double precision. The coverages were reprojected to UTM, HPGN and the units to meters. An item 'EDGE' was added to the arc attribute tables of all the coverages and CALCULATEd as "leftpoly = 0 OR rightpoly = 0". This was done so that during mapjoing process, the quad boundaries were dissolved. Individual quad maps of seagrass coverages were printed at the same scale as the source mylars (1:24,000) and checked for errors. The printouts were overlaid on the source mylars and checked for daylight as well as coding errors. Few minor errors were detected and corrected. Printouts of digitized maps were overlaid (at same scale) with aerial photographs. Dr. Robert Virstein compared a sample of 15 photos to digital maps, checking each polygon within the photo boundaries for polygon coding and location. Known errors were corrected.
ACCURACY OF SOURCE MATERIALS: as detailed as possible
QA STATUS: complete through date of textfile -------------------------------------------------------------------------------- PAT ITEM DEFINITIONS:
COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME INDEXED? 1 AREA 8 18 F 5 - 9 PERIMETER 8 18 F 5 - 17 SEAGRASS# 4 5 B - - 21 SEAGRASS-ID 4 5 B - - 25 SAVSHORE 4 5 B - - 29 SAVCONF 4 5 B - -

UNIQUE PAT ITEM VALUES AND DEFINITIONS:
ITEM VALUE DESCRIPTION ---- ----- -----------
SAVSHORE 0 none 1 Patchy Seagrass 2 Dense, Continuos Beds of Seagrass 3 unknown 4 potential emergent marsh 10 none 11 Patchy Seagrass 12 Dense, Continuos Beds of Seagrass 13 unknown 14 potential emergent marsh 40 none 50 none
SAVCONF 1 low 2 moderate 3 high
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ANNOTATION: None
Purpose:
REQUIRED: A summary of the intentions with which the data set was developed.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
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Status:
Progress: REQUIRED: The state of the data set.
Maintenance_and_Update_Frequency:
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Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -80.999779
East_Bounding_Coordinate: -80.239151
North_Bounding_Coordinate: 29.125318
South_Bounding_Coordinate: 27.499194
Keywords:
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Native_Data_Set_Environment:
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.1.1332
Data_Quality_Information:
Lineage:
Process_Step:
Process_Description: Metadata imported.
Source_Used_Citation_Abbreviation: V:\irl\projects\seagrass\Metadata\seagrass43.txt.xml
Process_Step:
Process_Description: Dataset copied.
Source_Used_Citation_Abbreviation: \\Windex\sjr\irl\projects\seagrass\layers\Seagrass.mdb
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.000000
Ordinate_Resolution: 0.000000
Planar_Distance_Units: meters
Geodetic_Model:
Horizontal_Datum_Name: D_North_American_1983_HARN
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137.000000
Denominator_of_Flattening_Ratio: 298.257222
Vertical_Coordinate_System_Definition:
Altitude_System_Definition:
Altitude_Resolution: 1.000000
Altitude_Encoding_Method:
Explicit elevation coordinate included with horizontal coordinates
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: ESLIB.SEAGRASS43_SHORELINE99
Attribute:
Attribute_Label: OBJECTID
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain:
Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: LD_TARGETS
Attribute:
Attribute_Label: AREA_ACRES
Attribute:
Attribute_Label: SHORELINE_YR
Attribute:
Attribute_Label: SEAGRASS_YR
Attribute:
Attribute_Label: SEAGRASS
Attribute:
Attribute_Label: HABITAT
Attribute:
Attribute_Label: Shape
Attribute_Definition: Feature geometry.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Coordinates defining the features.
Attribute:
Attribute_Label: SHAPE.AREA
Attribute:
Attribute_Label: SHAPE.LEN
Distribution_Information:
Resource_Description: Downloadable Data
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Transfer_Size: 9.650
Metadata_Reference_Information:
Metadata_Date: 20070308
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Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
Generated by mp version 2.9.12 on Wed Jul 01 15:52:14 2015