SEWRPC 2000 Digital Orthophotography

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

1.  Identification_Information:

Citation:

Citation_Information:

Originator:

Southeastern Wisconsin Regional Planning Commission, GIS Division

Publication_Date: 2000

Title: SEWRPC 2000 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 2000. The orthophoto files are prepared at two different scales: 1"=400' and 1"=200'. Each 400-scale image nominally covers four U.S. Public Land Survey System sections, for a total of 703 digital image files in the 400-scale data set. The pixel resolution of the 400-scale imagery is two feet on the ground, and the files contain overlap between images. Each 200-scale image covers an area of 5,000 by 5,000 feet on the Wisconsin State Plane Coordinate System, South Zone, for a total of 3,250 images in the 200-scale data set. The pixel resolution of the 200-scale imagery is one foot on the ground, with zero overlap between images. All orthophoto files are in GeoTIFF format with accompanying "world" (tfw) files.

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: 2000-03 or 2000-04

Currentness_Reference:

ground condition at the time of aerial photography (March or April 2000)

Status:

Progress: Complete

Maintenance_and_Update_Frequency: Regional orthophotography is updated at five-year intervals.

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: digital 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 2000 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 (400-scale images) or one foot on the ground (200-scale images). 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:

The 400-scale orthophoto images in this data set were prepared to meet National Map Accuracy Standards for 1:4800 scale mapping. The resolution of each pixel in the 400-scale files is two feet on the ground. Therefore, ninety percent or more of all well-defined planimetric features visible in the 400-scale imagery are within approximately 15 feet of their true position on the ground. The 200-scale orthophoto images in this data set were prepared to meet National Map Accuracy Standards for 1:2400 scale mapping. The resolution of each pixel in the 200-scale files is one foot on the ground. Therefore, ninety percent or more of all well-defined planimetric features visible in the 200-scale imagery are within approximately 8 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: 2000

Title: 2000 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: 200003 or 200004

Source_Currentness_Reference:

ground condition at date of aerial photography (March or April 2000)

Source_Citation_Abbreviation: Year 2000 Regional Orthophotography

Source_Contribution:

The year 2000 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 March or April 2000. The aerial photo negatives were scanned and the resulting files were processed to prepare digital orthophoto images.

Process_Date:

2000

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:

The 400-scale 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 GeoTIFF (Tagged Image File Format). The pixel resolution of the images is two feet on the ground, with areas of overlap between adjacent images. The orthophoto files are named according to the U.S. Public Land Survey System 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 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 (DGN file) in MicroStation format ("ortho.rsc" file name).

The 200-scale data set consists of a set of 3,250 black-and-white orthophoto images, with each image covering a 5,000 by 5,000 foot area or "tile" on the Wisconsin State Plane Coordinate System, South Zone. Each digital raster image file is approximately 26 megabytes in size, and is formatted in GeoTIFF (Tagged Image File Format). The pixel resolution of the images is one foot on the ground, with zero overlap between adjacent images. The orthophoto files are named according to the State Plane Coordinate System easting coordinate and northing coordinate, in thousands of feet, of the southwest corner of the image. Each image file includes an accompanying ESRI-format world file containing the coordinate information used to display and register the image in ESRI software.

Entity_and_Attribute_Detail_Citation:

Additional information about the orthophoto images and ancillary files is contained in a two-page document entitled "Year 2000 SEWRPC Regional Orthophotography Program: Description of Digital Products" 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: 2000 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: GeoTIFF (Tagged Image File Format)

Format_Information_Content: Digital image

Transfer_Size: 100000

Digital_Transfer_Option:

Offline_Option:

Offline_Media: CD-ROM

Recording_Capacity:

Recording_Density: 650

Recording_Density_Units: megabytes

Recording_Format: data written to CD-ROM, "Joliet, Mode 2" option

Fees:

The 400-scale digital orthophoto files and attendant digital map files containing control survey information and world files are packaged on CD-ROM, with each CD containing files that nominally cover one U.S. Public Land Survey System township. The 200-scale digital orthophoto files and accompanying world files are also packaged on CD-ROM with 25 images on each CD. 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: 2001, 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