Suffolk County 30 centimeter Resolution Natural Color Orthoimagery

Metadata:


Identification_Information:
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Identification_Information:
Citation:
Citation_Information:
Originator:
Publication_Date: Summer 2005
Title:
Suffolk County 30 centimeter Resolution Natural Color Orthoimagery
Geospatial_Data_Presentation_Form: remote-sensing image
Series_Information:
Series_Name: NYS Digital Orthoimagery Program (NYSDOP)
Publication_Information:
Publisher: NYS Office of Cyber Security
Description:
Abstract:
These files contain 2004 digital orthoimagery of Suffolk County, New York.
Image pixel size is 30 cm. GSD. Image type is natural color. Image
horizontal accuracy is +/-4 ft. at the 95% confidence level. Each file
contains an image covering 750 meters by 750 meters 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: -73.507684
East_Bounding_Coordinate: -71.835033
North_Bounding_Coordinate: 41.330098
South_Bounding_Coordinate: 40.574627
Keywords:
Theme:
Theme_Keyword_Thesaurus: Orthophoto, ortho
Theme_Keyword: Digital orthoimagery
Access_Constraints:
Use_Constraints:

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:

Native_Data_Set_Environment:
TIFF images scanned on a Z/I high-resolution photoscanner.
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Data_Quality_Information:
Lineage:
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Data_Quality_Information:
Logical_Consistency_Report:
The dataset contains raster images 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
e_10470162_12_07200_col_2004.tif Consistency of file naming was ensured by
the batch process.
Completeness_Report:
The project consisted of 5623 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. 
Final quality control for horizontal accuracy and image
quality was performed by New York State.
Cloud_Cover: <1%
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Spatial_Data_Organization_Information:
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Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Pixel
Row_Count: 2500
Column_Count: 2500
Vertical_Count: 1
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Spatial_Reference_Information:
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Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: Universal Transverse Mercator
Universal_Transverse_Mercator:
UTM_Zone_Number: 18
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.999600
Longitude_of_Central_Meridian: -75.000000
Latitude_of_Projection_Origin: 0.000000
False_Easting: 500000.000000
False_Northing: 0.000000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: row and column
Coordinate_Representation:
Abscissa_Resolution: 0.300000
Ordinate_Resolution: 0.300000
Planar_Distance_Units: meters
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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Entity_and_Attribute_Information:
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Distribution_Information:
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Distribution_Information:
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Transfer_Size: 5623
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Metadata_Reference_Information:
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Metadata_Reference_Information:
Metadata_Date: 20041231
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_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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