SEWRPC 2007 Digital Orthophoto Elevation Model Files

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:

Aero-Metric, Inc., Sheboygan, Wisconsin, on behalf of the U.S. Geological Survey and the Southeastern Wisconsin Regional Planning Commission

Publication_Date: 2007

Title: SEWRPC 2007 Digital Orthophoto Elevation Model Files

Geospatial_Data_Presentation_Form: vector digital data

Publication_Information:

Publication_Place: Waukesha, Wisconsin

Publisher: Southeastern Wisconsin Regional Planning Commission

Description:

Abstract:

This data set consists of digital map files containing elevation data covering the entirety of Milwaukee, Ozaukee, and Waukesha Counties; the southern three survey townships of Washington County; and an approximately 20-square-mile area in the southeast corner of Dodge County in Southeastern Wisconsin. The digital files contain point features ("mass points") and line features ("breaklines"). The files also contain boundaries of areas where the elevation model was revised from 2005 to 2007. Available in MicroStation 3-D DGN format, the set of 384 digital map files in this data set were created to support the preparation of digital orthophotography compiled at one-inch-equals-200-feet (1" = 200') scale. The elevation model files were prepared as part of the 2007 Orthophotography Program administered by the Southeastern Wisconsin Regional Planning Commission.

Purpose:

This data set was prepared to facilitate the preparation of orthophotography for the 2007 Orthophotography Program in Southeastern Wisconsin.

Time_Period_of_Content:

Time_Period_Information:

Multiple_Dates/Times:

Single_Date/Time:

Calendar_Date: 20070420

Single_Date/Time:

Calendar_Date: 20070421

Currentness_Reference:

ground condition at the time of aerial photography (April 20 and 21, 2007)

Status:

Progress: Complete

Maintenance_and_Update_Frequency:

The orthophoto elevation model files and regional orthophotography are generally updated at five-year intervals.

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -88.567

East_Bounding_Coordinate: -87.712

North_Bounding_Coordinate: 43.561

South_Bounding_Coordinate: 42.826

Keywords:

Theme:

Theme_Keyword_Thesaurus: none

Theme_Keyword: digital orthophoto elevation model

Theme_Keyword: aerial photography

Theme_Keyword: terrain model

Theme_Keyword: DEM

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: Milwaukee County

Place_Keyword: Ozaukee County

Place_Keyword: Washington County

Place_Keyword: Waukesha County

Place_Keyword: Dodge 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 elevation features in this data set were updated in the spring of 2007 and may not reflect current ground conditions. These elevation model files were prepared for use in the creation of one-inch-equals-200-feet scale orthophotography. The data set is specifically identified as a digital orthophoto elevation model, rather than a digital terrain model (DTM) or digital elevation model (DEM). Due to the relative density of elevational features in areas of revision in these files, the orthophoto elevation model files are to be used for orthophoto production only and are not suitable for preparation of large-scale topographic or contour mapping.

2.  Data_Quality_Information:

Logical_Consistency_Report:

The features in this data set were collected from aerial photography utilizing stereo-photogrammetric methods. The digital map files in the data set were reviewed to insure that all features are correctly represented and properly symbolized. The files were also inspected to insure that all features are complete and correctly organized in the files.

Completeness_Report:

The elevation features in this data set cover the entirety of Milwaukee, Ozaukee, and Waukesha Counties; the southern three survey townships of Washington County; and an approximately 20-square-mile area in the southeast corner of Dodge County in Southeastern Wisconsin. This data set was compiled by a photogrammetric engineering firm under subcontract to the Southeastern Wisconsin Regional Planning Commission. To the best knowledge of the Commission, this data set includes all of the intended features acquired from the aerial photography.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

The digital map files in this data set were prepared to meet National Map Accuracy Standards (NMAS) for one-inch-equals-200-feet scale (1:2400 scale) mapping. Therefore, ninety percent or more of all well-defined planimetric features in this data set are within approximately 6.6 feet of their true position on the ground. This data set generally does not depict "well-defined planimetric features" but does show mass points and breaklines to the accuracy of the NMAS specifications.

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

Certain areas in the digital elevation model files in this data set do not contain a sufficient density of mass points and breaklines such that the files can be used for the preparation of large-scale contour mapping. Specifically, this 2007 orthophoto elevation model data set was created by revisions of portions of 2005 orthophoto elevation models in some counties and revisions of portions of 2004 and 2005 digital terrain model (DTM) files in other counties.

The 2007 orthophoto elevation model files are suitable for the preparation of 10-foot contour interval mapping to National Map Accuracy Standards, but should not be used to create contour lines for an interval smaller than 10 feet. Because of the relative density of elevation points and lines, 10-foot interval contour lines generated from these orthophoto elevation model files may not look similar to, or be as accurate as, 10-foot interval contour lines generated from large-scale DTM files. Accordingly, ninety percent or more of all elevational features in these orthophoto elevation model files are within approximately 5.0 feet of their true vertical position.

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator:

Aero-Metric, Inc., Sheboygan, Wisconsin; Wisconsin land surveyors; various other originators

Publication_Date: unknown

Title:

SEWRPC 2007 aerial photography, control survey information, legacy orthophoto elevation model files

Geospatial_Data_Presentation_Form:

digital aerial photography, control survey documents, vector digital data

Publication_Information:

Publication_Place: Waukesha, Wisconsin, and other locations

Publisher: various publishers

Source_Scale_Denominator: 1200, 2400

Type_of_Source_Media:

digital aerial photography, horizontal and vertical control survey information, legacy digital orthophoto elevation model files

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: unknown

Source_Currentness_Reference: ground condition

Source_Citation_Abbreviation: none

Source_Contribution:

The orthophoto elevation model files were prepared from aerial photography using legacy digital orthophoto elevation model files and control survey information.

Process_Step:

Process_Description:

This data set was prepared from aerial photography taken in April 2007. The aerial photography was collected using a Digital Mapping Camera from a nominal flight elevation of 10,000 feet. The project contractor, Aero-Metric, Inc., was provided with existing digital orthophoto elevation model files obtained from the year 2005 orthophotography program carried out in the Southeastern Wisconsin Region. The contractor compared the elevation surface visible from the newer 2007 aerial photography with the 2005 elevation model and noted areas where change had ocurred since the year 2005. New elevation features (mass points and breaklines) were collected for those areas that required updating. Mass points for large areas were collected by an auto-correlation process that generated a regular grid of elevation points for the selected area. The updated orthophoto elevation model was arranged into 384 MicroStation 3-D DGN format files and used to prepare the 2007 digital orthophotograpy for Milwaukee, Ozaukee, and Waukesha Counties and portions of Dodge and Washington Counties.

Process_Date: 2007

3.  Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: vector

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: String

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 digital map files containing elevation data covering the entirety of Milwaukee, Ozaukee, and Waukesha Counties; the southern three survey townships of Washington County; and an approximately 20-square-mile area in the southeast corner of Dodge County in Southeastern Wisconsin. The digital files contain point features ("mass points") and line features ("breaklines"). The files also contain boundaries of areas where the elevation model was revised from 2005 to 2007. Available in MicroStation 3-D DGN format, the set of 384 digital map files in this data set were created to support the preparation of digital orthophotography compiled at one-inch-equals-200-feet (1" = 200') scale. The elevation model files were prepared as part of the 2007 Orthophotography Program administered by the Southeastern Wisconsin Regional Planning Commission. The entire set of 384 MicroStation DGN format files is approximately 200 megabytes in size.

These digital elevation model files were prepared for use in the creation of one-inch-equals-200-feet scale orthophotography. The data set is specifically identified as a digital orthophoto elevation model, rather than a digital terrain model (DTM) or digital elevation model (DEM). Due to the relative density of elevational features in these files, the orthophoto elevation model files are to be used for orthophoto production only and are not suitable for preparation of large-scale topographic or contour mapping.

Entity_and_Attribute_Detail_Citation: none

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: SEWRPC 2007 Orthophoto Elevation Model Files

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: MicroStation 3-D DGN format

Format_Information_Content: point and line features with elevational attributes

Transfer_Size: 200

Digital_Transfer_Option:

Offline_Option:

Offline_Media: CD-ROM or DVD

Recording_Capacity:

Recording_Density: 650, 4800

Recording_Density_Units: approximately 650 megabytes per CD-ROM or 4.8 gigabytes per DVD

Recording_Format: ISO 9660 Level 3

Fees:

Cost is $50 per CD-ROM 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: 20071130

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