Suffolk County 12-inch Resolution Natural Color Orthoimagery

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: NYS Office of Cyber Security
Publication_Date: Spring 2004
Title:
Suffolk County 12-inch Resolution Natural Color Orthoimagery
Geospatial_Data_Presentation_Form: remote-sensing image
Series_Information:
Series_Name: NYS Digital Orthoimagery Program (NYSDOP)
Publication_Information:
Publisher: NYS OCS
Description:
Abstract:
These files contain 2004 digital orthoimagery of Suffolk County, New York. Image pixel size is 1.0 ft. GSD. Image type is natural color. Image horizontal accuracy is +/-4 ft. at the 95% confidence level.  Each file contains an image covering 3000 ft. by 2000 ft. on the ground.
Purpose:
This digital orthoimagery can serve a variety of purposes, from general planning to field reference for spatial analysis to a tool for revision of vector maps. It can also serve as a reference layer for GIS.
Supplemental_Information:
Digital elevation models used for orthorectification were compiled from several sources, all of which were compiled photogrammetrically.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: April 2004
Currentness_Reference:
ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: Irregular
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -73.503917
East_Bounding_Coordinate: -71.838844
North_Bounding_Coordinate: 41.323849
South_Bounding_Coordinate: 40.585951
Keywords:
Theme:
Theme_Keyword_Thesaurus: Orthophoto, ortho
Theme_Keyword: Digital orthoimagery
Access_Constraints: Some imagery tiles are classified and are only available to the public through a separate request procedure.
Use_Constraints:
Use of sensitive imagery, if granted, is only for the use specified in the request.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Tim Ruhren
Contact_Organization: NYS Office of Cyber Security
Contact_Position: NYS GIS Clearinghouse
Contact_Address:
Address_Type: mailing and physical address
Address:
30 South Pearl Street
City: Albany
State_or_Province: New York
Postal_Code: 12207-3425
Country: USA
Contact_Voice_Telephone: 518-474-5212
Contact_Facsimile_Telephone: 518-473-5848
Contact_Electronic_Mail_Address: nysgis@dhses.ny.gov
Data_Set_Credit:
NYS Office of Cyber Security
Native_Data_Set_Environment:
TIFF images scanned on a Z/I high-resolution photoscanner
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Data_Quality_Information:
Logical_Consistency_Report:
The dataset contains raster or digital ortho images so the logical consistency report is not applicable. The file naming convention was supplied by New York state and is based on the co-ordinate pair of the lower left corner of the ortho tile. When the ortho tiles were created the file names were restricted to a numeric value representing the lower left corner of the ortho tile. 10470162 which represented a tile with the lower left corner of 1047000, 162000. These tiles were then all renamed using a batch script so that they reflected the N.Y. state standard I_10470162_12_5000_col_2000.tif Consistency of file naming was ensured by the batch process. 
Completeness_Report:
The project consisted of 5665 final tiles 
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
+/-4 ft. at the 95% confidence level (NSSDA)
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
Not applicable.
Lineage:
Process_Step:
Process_Description:
1:14,400 scale aerial photography with airborne GPS was acquired April 6 to
16, 2004 with a Wild RC-30 aerial camera system. The imagery was scanned at 14 microns directly from the aerial negatives.  The aero triangulation process utilized an airborne gps survey undertaken during the flight to provided geodetic coordinates and elevation of photo centers. Also, image targeted ground control points where visible on the 2004 aerial flight and were used as control.  Aerial triangulation was performed using softcopy workstations and Mira Solutions AT bundle
adjustment program, Mira-AT. Details of the aerial triangulation process can be found in the Suffolk County, New York 2004 Orthophoto Update Project Aerial Triangulation Report. For the 2001 orthophoto project only minimum DTM was collected in the center area of each aerial photo model creating an uneven distribution of terrain data throughout the project area. This process created what has been called "donut-holes" in the DTM and limited the usefulness of the data set for
future ortho photo projects and other applications for this level of DTM. The 2004 project requirement was to fill in these sparse areas of DTM to create a consistent pattern digital terrain points throughout the project area. This was done by using a softcopy workstation with the AMSA-Softcopy program, overlaying the existing DTM on the stereo model and then adding points or breaklines to create a uniform level of digital terrain data. During this process the aerial photography was inspected for new roads and
bridges that required collection of a bridge polygon that was used to correct the shape of the bridge during the orthophoto process. The photo inspection was assisted by information provided by Suffolk County as to the location of new roadways since 2001. The images were then ortho rectified using Mira Solutions Mira Ortho software. Mira Solutions Mira Mosaic program was used for the mosaicking, color balancing and tiling of the imagery. During the orthophoto process Mira Ortho software processed the bridges so one or both sides of an
elevated bridge had a solid black apron created to eliminate any signs of image smearing. The Mira Solutions process produced the same effect for bridges as was required to meet the previous ortho photo project. Quality control was maintained throughout the process using internal QA programs within the Mira Solutions suite of orthophoto production software. Final files were then compressed using MrSID. Final deliverables in TIFF format with TFW files and MrSID files where placed on DVD Media.
Cloud_Cover: <1%
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Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Pixel
Row_Count: 2000
Column_Count: 3000
Vertical_Count: 1
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Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: State Plane Coordinate System 1983
State_Plane_Coordinate_System:
SPCS_Zone_Identifier: 3104
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.999900
Longitude_of_Central_Meridian: -74.500000
Latitude_of_Projection_Origin: 38.833333
False_Easting: 492125.000000
False_Northing: 0.000000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: row and column
Coordinate_Representation:
Abscissa_Resolution: 1.000000
Ordinate_Resolution: 1.000000
Planar_Distance_Units: survey feet
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137.000000
Denominator_of_Flattening_Ratio: 298.257222
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Entity_and_Attribute_Information:
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Distribution_Information:
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Transfer_Size: 5665
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Metadata_Reference_Information:
Metadata_Date: 20050705
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: NYS OCS
Contact_Person: Tim Ruhren
Contact_Address:
Address_Type: mailing and physical address
Address:
30 South Pearl Street
City: Albany
State_or_Province: New York
Postal_Code: 12207-3425
Country: USA
Contact_Voice_Telephone: 518-474-5212
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
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