SEWRPC 1995 Digital Orthophotography

Metadata:

1.  Identification_Information:

Citation:
Citation_Information:
Originator:
Southeastern Wisconsin Regional Planning Commission, GIS Division
Publication_Date: 1995
Title: SEWRPC 1995 Digital Orthophotography
Geospatial_Data_Presentation_Form: raster digital data
Publication_Information:
Publication_Place: Waukesha, Wisconsin
Publisher: Southeastern Wisconsin Regional Planning Commission
Description:
Abstract:
This data set consists of digital orthophoto images obtained from 1:20,000 scale black-and-white aerial photography acquired in the spring of 1995. Each image nominally covers four U.S. Public Land Survey System sections, for a total of 703 digital image files in the data set. The pixel resolution of the imagery is two feet on the ground. The files are in TIFF format.
Purpose:
This data set was collected to provide an inventory of orthophoto images of Southeastern Wisconsin and to be used for broad regional planning purposes.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1995-04
Currentness_Reference: ground condition at the time of aerial photography (April 1995)
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -88.800
East_Bounding_Coordinate: -87.712
North_Bounding_Coordinate: 43.561
South_Bounding_Coordinate: 42.484
Keywords:
Theme:
Theme_Keyword_Thesaurus: none
Theme_Keyword: orthophotography
Theme_Keyword: aerial photography
Theme_Keyword: image data
Theme_Keyword: raster data
Place:
Place_Keyword_Thesaurus:
Counties and County Equivalents of the States of the United States and the District of Columbia (FIPS Pub 6-3)
Place_Keyword: Kenosha County
Place_Keyword: Milwaukee County
Place_Keyword: Ozaukee County
Place_Keyword: Racine County
Place_Keyword: Walworth County
Place_Keyword: Washington County
Place_Keyword: Waukesha County
Place_Keyword: State of Wisconsin
Access_Constraints:
There are no legal prerequisites for accessing this data set. Potential users should contact the Southeastern Wisconsin Regional Planning Commission GIS Division.
Use_Constraints:
The orthophotography in this data set was acquired in the spring of 1995 and may not reflect current ground conditions.

2.  Data_Quality_Information:

Logical_Consistency_Report:
This raster data set contains pixels with values that represent relative brightness. Each pixel represents two feet on the ground. The orthophoto images were reviewed for positional accuracy by comparison of the imagery with ground survey control features (section and quarter-section corners of the U.S. Public Land Survey System).
Completeness_Report:
The digital orthophoto images in this data set cover the entirety of Kenosha, Milwaukee, Ozaukee, Racine, Walworth, Washington, and Waukesha Counties, and small portions of Dodge, Jefferson, and Rock Counties in Wisconsin.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
This data set was prepared to meet National Map Accuracy Standards for 1:4800 scale mapping. The resolution of each pixel in the raster files is two feet on the ground. Therefore, ninety percent or more of all clearly-defined planimetric features visible in the imagery are within approximately 15 feet of their true position on the ground.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator:
Ayres Associates, Inc., and the Southeastern Wisconsin Regional Planning Commission
Publication_Date: 1995
Title: 1995 Regional Aerial Photography
Geospatial_Data_Presentation_Form: raster digital data, aerial photography, orthophotography
Publication_Information:
Publication_Place: Madison and Waukesha, Wisconsin
Publisher:
Ayres Associates, Inc., and the Southeastern Wisconsin Regional Planning Commission
Source_Scale_Denominator: 20000
Type_of_Source_Media: aerial photography negatives
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 199504
Source_Currentness_Reference: ground condition at date of aerial photography (April 1995)
Source_Citation_Abbreviation: 1995 Regional Orthophotography
Source_Contribution:
The 1995 orthophoto images were obtained by scanning 1:20,000 scale aerial photograph negatives.
Process_Step:
Process_Description:
This data set was prepared from aerial photography taken in April 1995. The aerial photo negatives were scanned and the resulting files were processed to prepare digital orthophoto images.
Process_Date:
1995

3.  Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: raster
Raster_Object_Information:
Raster_Object_Type:
pixel

4.  Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: State Plane Coordinate System 1927
State_Plane_Coordinate_System:
SPCS_Zone_Identifier: 4803
Lambert_Conformal_Conic:
Standard_Parallel: 42.733300
Standard_Parallel: 44.066700
Longitude_of_Central_Meridian: -90.00
Latitude_of_Projection_Origin: 42.00
False_Easting: 2000000.000000
False_Northing: 0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.0001
Ordinate_Resolution: 0.0001
Planar_Distance_Units: survey feet
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1927
Ellipsoid_Name: Clarke 1866
Semi-major_Axis: 6378206.400000
Denominator_of_Flattening_Ratio:
294.980000

5.  Entity_and_Attribute_Information:

Overview_Description:
Entity_and_Attribute_Overview:
This data set consists of a set of 703 black-and-white orthophoto images, with each image covering four U.S. Public Land Survey System sections. Each digital raster image file is approximately 32 megabytes in size, and is formatted in standard "TIFF" tagged image file format. The pixel resolution of the images is two feet on the ground. The orthophoto files are named according to the U.S. Public Land Survey Syatem township, range, and four-section area covered by the image. In addition, a number of ancillary digital files are available that complement the orthophoto image files. These include: 1) a generic ASCII-format text file containing the State Plane coordinates of the extent of the image (".bnd" file extension); 2) an ESRI-format world file containing the coordinate information used to display and register the image in ESRI software (".tfw" file extension); 3) a GenaMap-format registration file containing the coordinate information required to display the image in GenaMap software (".IF" file extension); 4) a symbolized vector and text file containing U.S. Public Land Survey System section and quarter-section corners and lines and map legend and title information in MicroStation format (".dgn" file extension); and 4) a text resource file containing font information for display of the vector and text file in MicroStation format ("SEW.rsc" file name).
Entity_and_Attribute_Detail_Citation:
Additional information about the orthophoto images and ancillary files is contained in the one-page document entitled "Digital Orthophoto File Naming Convention" available from the Southeastern Wisconsin Regional Planning Commission GIS Division.

6.  Distribution_Information:

Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
Southeastern Wisconsin Regional Planning Commission, GIS Division
Contact_Position: GIS Manager
Contact_Address:
Address_Type: mailing address
Address: P.O. Box 1607
City: Waukesha
State_or_Province: Wisconsin
Postal_Code: 53187-1607
Contact_Voice_Telephone: (262) 547-6721
Contact_Facsimile_Telephone: (262) 547-1103
Resource_Description: 1995 Regional Orthophotography
Distribution_Liability:
This digital data set was created for use by the Southeastern Wisconsin Regional Planning Commission for regional planning purposes. Any other use/application of this information is the responsibility of the user and such use/application is at the user's own discretion and risk. The Southeastern Wisconsin Regional Planning Commission disclaims all liability regarding fitness of the information for any use other than Commission applications.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: "TIFF" Tagged Image File Format
Format_Information_Content: Digital image
Transfer_Size: 22500
Digital_Transfer_Option:
Offline_Option:
Offline_Media: CD-ROM
Recording_Capacity:
Recording_Density: 640
Recording_Density_Units: megabytes
Recording_Format: data written to CD-ROM, "Joliet, Mode 2" option
Fees:
Digital orthophoto files and attendant digital map files containing control survey information are packaged on CD-ROMs, with each CD-ROM containing files that nominally cover one U.S. Public Land Survey System township. The cost per CD-ROM is $50 plus tax and shipping. Requesters should inquire of contact organization and contact person.
Ordering_Instructions: Written requests are preferred.
Turnaround:
Varies

7.  Metadata_Reference_Information:

Metadata_Date: 2000, 2002-09-06
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
Southeastern Wisconsin Regional Planning Commission, GIS Division
Contact_Position: GIS Manager
Contact_Address:
Address_Type: mailing address
Address: P.O. Box 1607
City: Waukesha
State_or_Province: Wisconsin
Postal_Code: 53187-1607
Contact_Voice_Telephone: (262) 547-6721
Contact_Facsimile_Telephone: (262) 547-1103
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Generated by mp version 2.8.11 on Wed Sep 01 09:35:57 2004