Westchester County 6-inch Resolution Natural Color Orthoimagery

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: NYS Office of Cyber Security
Publication_Date: Spring 2004
Title:
Westchester County 6-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 Westchester County, New York. Image pixel size is 0.5 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: -73.990558
East_Bounding_Coordinate: -73.472964
North_Bounding_Coordinate: 41.374354
South_Bounding_Coordinate: 40.871435
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
Back to Top
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 2427 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:
The aerial film was acquired in April 2004. The imagery was scanned at 14 microns using a Z/I Imaging PhotoScan 2000 scanner.  The Ground control used to support the ortho mapping was collected by either paneling and targeting of permanent monuments or photographic identification of strategic points. The coordinates were collected via  ground survey techniques. The Aerial Triangulation was performed on softcopy workstations using Leica Orima software.  The final bundle adjustment was performed using PAT-B software.  Digital Elevation Models were updated from previous, year 2000, Westchester County DTM. The northern border DTM was provided by VARGIS (Putnam County).  The west border DTM was provided by VARGIS (Rockland County).  DTM outside the County boundary on the CT and NYC sides was stereo-compiled from the 2004 imagery.
      All DTM were reviewed for changes to the terrain and updated on softcopy workstations using the 2004 photography. All bridges were modeled in 3-D to properly rectify them on the imagery.  They were captured using standard photogrammetric stereo-compilation techniques on softcopy workstations.  Sanborn's Metro process is able to rectify bridges with the same methodology used to model all other ground features.  The bridges area coded uniquely and later removed from the final DTM file. The images were ortho-rectified using METRO, Sanborn's proprietary software. Color balancing was performed using METRO_NICE software. The resulting images are seamlessly mosaiced into orthophoto tiles.  Images were quality controlled using Adobe PhotoShop software.  Final deliverables in geotiff format with tfw files and metadata files where placed on DVD Media.
Cloud_Cover: <1%
Back to Top
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
Back to Top
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: 3101
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: 2.000000
Ordinate_Resolution: 2.000000
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
Back to Top
Entity_and_Attribute_Information:
Back to Top
Distribution_Information:
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Transfer_Size: 9180
Back to Top
Metadata_Reference_Information:
Metadata_Date: 20041229
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
Back to Top