Fledermaus Scene of the Central Portion of the Pulley Ridge Study Area

Metadata:

• Identification_Information
• Data_Quality_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: VeeAnn A. Cross

Publication_Date: 2005

Title:

Fledermaus Scene of the Central Portion of the Pulley Ridge Study Area

Online_Linkage:

<http://pubs.usgs.gov/of/2005/1089/data/visualization/centralpulley_ivs.zip>

Larger_Work_Citation:

Citation_Information:

Originator: VeeAnn A. Cross

Originator: David C. Twichell

Originator: Robert B. Halley

Originator: Kate T. Ciembronowicz

Originator: Bret D. Jarrett

Originator: Erika S. Hammar-Klose

Originator: Al C. Hine

Originator: Stan D. Locker

Originator: Dave F. Naar

Publication_Date: 2005

Title:

GIS Compilation of Data Collected from the Pulley Ridge Deep Coral Reef Region

Series_Information:

Series_Name: Open-File Report

Issue_Identification: 2005-1089

Publication_Information:

Publication_Place: Woods Hole Science Center, Woods Hole, MA

Publisher: U.S. Geological Survey, Coastal and Marine Geology Program

Online_Linkage: <http://pubs.usgs.gov/of/2005/1089>

Description:

Abstract:

Pulley Ridge is a series of drowned barrier islands that extends almost 200 km in 60-100 m water depths. This drowned ridge is located on the Florida Platform in the southeastern Gulf of Mexico about 250 km west of Cape Sable, Florida. This barrier island chain formed during the initial stage of the Holocene marine transgression. These islands were then submerged and left abandoned near the outer edge of the Florida Platform. The southern portion of Pulley Ridge hosts zooxanthellate scleractinian corals, green, red and brown macro algae, and a mix of deep and typically shallow-water tropical fishes. This reef community is in unusually deep water, and its extent and the controls on its distribution were unknown. To address these questions scientists from the U.S. Geological Survey Coastal and Marine Geology Program in cooperation with scientists from the University of South Florida Department of Marine Sciences have completed a detailed mapping of the southernmost 35 km of Pulley Ridge. The area was mapped using multibeam bathymetry, sidescan-sonar imagery, and high-resolution seismic-reflection profiling to define the geologic framework on which the reef is established. Submersible dives, remotely operated vehicle (ROV) transects, and transects of bottom photographs and video were collected to identify the corals and to map their distribution. This extensive suite of data has been compiled and preliminary analysis of the data suggests that the reefs are not tied to the ridge system, but instead are more broadly distributed. Whether reef distribution is controlled by oceanographic conditions or by subtle differences in the substrate that overlies the barrier island system is unclear, and are topics of continued research.

Purpose:

This animation is provided to provide the 3D visualization relating the SeaBOSS bottom photographs with the high-resolution bathymetry collected in the study area.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2005

Currentness_Reference: publication date

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -83.792254

East_Bounding_Coordinate: -83.591486

North_Bounding_Coordinate: 25.000776

South_Bounding_Coordinate: 24.671257

Keywords:

Theme:

Theme_Keyword_Thesaurus: General

Theme_Keyword: Coastal and Marine Geology Program

Theme_Keyword: CMGP

Theme_Keyword: OF 2005-1089

Theme_Keyword: Open-File Report

Theme_Keyword: reef

Theme_Keyword: bathymetry

Theme_Keyword: SeaBOSS

Theme_Keyword: U.S. Geological Survey

Theme_Keyword: USGS

Theme_Keyword: Woods Hole Science Center

Theme_Keyword: scene

Theme_Keyword: Fledermaus

Place:

Place_Keyword_Thesaurus: General

Place_Keyword: Florida

Place_Keyword: Florida Shelf

Place_Keyword: Gulf of Mexico

Place_Keyword: North America

Place_Keyword: Pulley Ridge

Place_Keyword: United States

Access_Constraints: None.

Use_Constraints:

The U.S. Geological Survey must be referenced as the originator of the dataset in any future products or research derived from these data.

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: VeeAnn A. Cross

Contact_Organization: U.S. Geological Survey

Contact_Position: Marine Geologist

Contact_Address:

Address_Type: mailing and physical address

Address: 384 Woods Hole Rd.

City: Woods Hole

State_or_Province: MA

Postal_Code: 02543-1598

Contact_Voice_Telephone: (508) 548-8700 x2251

Contact_Facsimile_Telephone: (508) 457-2310

Contact_Electronic_Mail_Address: vatnipp@usgs.gov

Native_Data_Set_Environment:

Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.0.0.535

Data_Quality_Information:

Lineage:

Process_Step:

Process_Description:

High-resolution swath bathymetry was converted into a Fledermaus file format (data object) with a colormap applied using the IVS DMAGIC software package.

Process_Step:

Process_Description:

An ArcView avenue script was used to derive the x and y corner point locations of a SeaBOSS bottom photograph if the photograph was made vertical. This was done by taking the polyline shapefile of the photograph locations to get the direction of travel. Since this polyline shapefile was generated from the point shapefile of photograph locations, each vertex in the polyline represents a photo location. A graphic line, perpendicular to the direction of travel of the polyline, was generated at each vertex of the SeaBOSS polyline. The length of this graphic is a constant value as defined in the script. For this work, the length of the graphic line was set to 200m. This in-house generated script is called createtransectsatvertices.ave.

Process_Step:

Process_Description:

These graphic lines were then converted to a polyline shapefile.

Process_Step:

Process_Description:

These polylines were then rotated 45 degrees using the in-house script vac_rotatepolyline.ave.

Process_Step:

Process_Description:

The script track_startend.ave was then used to add the start and end points (x and y) to each polyline. Other attributes that correspond to each photo location were incorporated into this shapefile. These include the bottom photograph filename corresponding to each line, approximate depth at the center of each transect line, and an upper z-limit (10 meters above the seafloor elevation).

Process_Step:

Process_Description:

This table of information was then exported to a delimited text file and reformatted using an awk script. The new format incorporated the command line version of the IVS vertical image creator. This command requires the following information:

mkvimage < -in <imageFile>> [-out <sdOutFile> ] < -start xval yval > < -end xval yval > < -zrange zmin zmax >

For use within a script running from a command prompt, the text "cmdop" needs to be added at the beginning of the line. This program takes as input an image file that represents a vertically oriented image plane along with the starting and ending locations and z-range. It then creates a Fledermaus formatted SD file representing a vertical slice that can be used in a Fledermaus 3D scene.

Process_Step:

Process_Description:

A subset of the total number of SeaBOSS bottom photographs was selected. These points were also extracted from the photopnts shapefile into a separate shapefile, while the remaining points were left in a separate shapefile.

Process_Step:

Process_Description:

The study area was roughly divided into 3 areas: southern, central and northern. This was necessary due to the large number of vertical images that were going to be used. The bathymetry SD files and the point shapefiles representing the selected images and remaining images were loaded into Fledermaus. In addition, the vertical image files corresponding to the central portion of the study area were also loaded. The following projection parameters were used for the scene: near clipping plane: 0.01 far clipping plane: 250000 scene pushback: 250 global scene scale: 28

In addition to the data files, a polyline shapefile was also added to the scene which was to represent the approximate flight path for the animation. A vertical exaggeration of 18 was applied to the scene. This exaggeration also applied to the vertical images. The initial vertical extent of each image was 10 meters, but with this additional exaggeration applied, the images remained proportional based on a 200 m width for each image.

Distribution_Information:

Distributor:

Contact_Information:

Contact_Person_Primary:

Contact_Person: VeeAnn A. Cross

Contact_Organization: U.S. Geological Survey

Contact_Position: Marine Geologist

Contact_Address:

Address_Type: mailing and physical address

Address: 384 Woods Hole Rd.

City: Woods Hole

State_or_Province: MA

Postal_Code: 02543-1598

Contact_Voice_Telephone: (508) 548-8700 x2251

Contact_Facsimile_Telephone: (508) 457-2310

Contact_Electronic_Mail_Address: vatnipp@usgs.gov

Resource_Description: Downloadable Data

Technical_Prerequisites:

The user must have either IVS Fledermaus software, or the free viewer iView3D (available from

IVS) to view this visualization file. (<http://www.ivs.unb.ca/>)

Metadata_Reference_Information:

Metadata_Date: 20050513

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: VeeAnn A. Cross

Contact_Organization: U.S. Geological Survey

Contact_Position: Marine Geologist

Contact_Address:

Address_Type: mailing and physical address

Address: 384 Woods Hole Rd.

City: Woods Hole

State_or_Province: MA

Postal_Code: 02543-1598

Contact_Voice_Telephone: (508) 548-8700 x2251

Contact_Facsimile_Telephone: (508) 457-2310

Contact_Electronic_Mail_Address: vatnipp@usgs.gov

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: local time

Metadata_Extensions:

Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>

Profile_Name: ESRI Metadata Profile