1997 Digital Orthophotos, Twin Cities Metropolitan Area

This page last updated: 06/25/2015
Metadata created using Minnesota Geographic Metadata Guidelines

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1. Overview
2. Data Quality
3. Data Organization
4. Coordinate System
5. Attributes
6. Distribution - Get Data
7. Metadata Reference

Section 1 Overview
Originator Metropolitan Council
Title 1997 Digital Orthophotos, Twin Cities Metropolitan Area
Abstract This dataset contains 265 digital, black and white orthophoto quarter-quadrangles (DOQs), 3.75' x 3.75', covering the 7 county Twin Cities (Minneapolis and St. Paul) Metropolitan Area in Minnesota. Each CD-ROM contains up to 4 quarter-quadrangles of a USGS 7.5 minute quadrangle, where a quarter-quadrangle is included IF it's coverage includes any portion of the Twin cities 7 county area. The orthophotos are in UTM, Zone 15, NAD83 projection. Each image is approximately 120 Mb, with a .6 meter image pixel, and available in TIFF format. There are a total of 76 CD-ROMs plus one CD-ROM that contains one metadata record for the dataset and a header file (.hdr) for each image. These DOQs were produced using the USGS DOQ specifications except for the scan resolution (pixel size is .6m rather than 1 meter) and the file format. The original imagery was collected at 20,000 ft and centered on USGS quarter-quads.

This dataset is available for direct use via the MnGeo Geospatial Image Service (Twin Cities metro layer). More information at http://www.mngeo.state.mn.us/chouse/wms/geo_image_server.html
Purpose Metropolitan Council purchased digital aerial photography for their 1997 generalized land use interpretation project. Digital orthophoto production from this digital imagery was found to be more useful to this project, other divisions and projects within Metropolitan Council, as well as many other organizations in the metropolitan area. Costs of the digital orthophoto productions were shared by partners with Metropolitan Council.
Time Period of Content Date 04/1997
Currentness Reference The dates of the original aerial photography were April 13 and April 14, 1997 with a couple of reflights in late April.
Progress Complete
Maintenance and Update Frequency Unknown. The Metropolitan Council is required to collect Generalize Land Use data at the same time as the Census. The Met. Council plans to acquire aerial imagery for that project again in 2000, but not necessarily DOQs.
Spatial Extent of Data Twin Cities 7 County Metropolitan Area. This includes the counties of Anoka, Carver, Dakota, Hennepin, Ramsey, Scott and Washington in Minnesota.
Bounding Coordinates -94.06
Place Keywords Twin Cities, Anoka County, Carver County, Dakota County, Hennepin County, Ramsey County, Scott County, Washington County
Theme Keywords orthophotography, ortho, orthophoto, DOQ, DOQQ, imagery, image, digital ortho, aerial photography, aerial photos, digital aerial photography
Theme Keyword Thesaurus
Access Constraints None.
Use Constraints None,
Contact Person Information Tanya Mayer, GIS Specialist
Metropolitan Council
390 Robert Street North
St. Paul, MN  55101-1805
Phone: 651.602.1604
Email: tanya.mayer@metc.state.mn.us
Browse Graphic Click to view a data sample
Associated Data Sets 2000 Metropolitan Council Digital Orthophotos,
1991 USGS DOQs

Section 2 Data Quality
Attribute Accuracy
Logical Consistency
Horizontal Positional Accuracy NMAS @ 1:24000 scale, 7.4 rms 1 - sigma (or 12.2m @ 90% confidence), DOQQ Spec.
Vertical Positional Accuracy Not applicable
Lineage Orthophotos were developed under contract with Horizons, Inc.

All pertinent information for each dataset is contained in a header file (.HDR) which has been provided for each image. An example of these header files is shown below:
WEST_LONGITUDE -93 33 45.000 *
EAST_LONGITUDE -93 30 0.000 *
NORTH_LATITUDE 45 26 15.000 *
SOUTH_LATITUDE 45 22 30.000 *
PRODUCTION_DATE 1998 05 11 *
SAMPLES_AND_LINES 9266 12650 *
XY_ORIGIN 455640.000 5032010.000 *
SECONDARY_XY_ORIGIN 455657.365 5031796.177 *
NW_QUAD_CORNER_XY 456005.090 5031706.845 *
NE_QUAD_CORNER_XY 460893.411 5031674.551 *
SE_QUAD_CORNER_XY 460850.262 5024731.100 *
SW_QUAD_CORNER_XY 455956.546 5024763.395 *
SECONDARY_NW_QUAD_XY 456003.779 5031489.290 *
SECONDARY_NE_QUAD_XY 460892.246 5031456.995 *
SECONDARY_SE_QUAD_XY 460849.097 5024513.595 *
SECONDARY_SW_QUAD_XY 455955.235 5024545.891 *
RMSE_XY 1.2 *
IMAGE_SOURCE black & white film *
SOURCE_IMAGE_ID 93-09-686 *
SOURCE_IMAGE_DATE 1997 04 14 *
SOURCE_DEM_DATE 0000 00 00 *
AGENCY Metropolitan Council *
PRODUCER Horizons, Inc. *
PRODUCTION_SYSTEM KLT v1.0 10/97 MDOQ v1.0 12/97 *
METADATA_DATE 1998 05 11 *
DATA_FILE_SIZE 117224166 *

Section 3 Spatial Data Organization (not used in this metadata)

Section 4 Coordinate System
Horizontal Coordinate Scheme Universal Transverse Mercator
UTM Zone Number 15
Horizontal Datum NAD83
Horizontal Units meters
Cell Width 0.6
Cell Height 0.6

Section 5 Attributes
Detailed Citation
Table Detail:

Section 6 Distribution
Publisher Metropolitan Council
Publication Date 02/1999
Contact Person Information Tanya Mayer, GIS Specialist
Metropolitan Council
390 Robert Street North
St. Paul, MN  55101-1805
Phone: 651.602.1604
Email: tanya.mayer@metc.state.mn.us
Distributor's Data Set Identifier orthos1997
Distribution Liability NOTICE: The Geographic Information System (GIS) Data to which this notice is attached are made available pursuant to the Minnesota Government Data Practices Act (Minnesota Statutes Chapter 13). THE GIS DATA ARE PROVIDED TO YOU AS IS AND WITHOUT ANY WARRANTY AS TO THEIR PERFORMANCE, MERCHANTABILITY, OR FITNESS FOR ANY PARTICULAR PURPOSE. The GIS Data were developed by the Metropolitan Council for its own internal business purposes. The Metropolitan Council does not represent or warrant that the GIS Data or the data documentation are error-free, complete, current, or accurate. You are responsible for any consequences resulting from your use of the GIS Data or your reliance on the GIS Data. You should consult the data documentation for this particular GIS Data to determine the limitations of the GIS Data and the precision with which the GIS Data may depict distance, direction, location, or other geographic features. If you transmit or provide the GIS Data (or any portion of it) to another user, it is recommended that the GIS Data include a copy of this disclaimer and this metadata.
Ordering Instructions This dataset is available for free direct use via the MnGeo Geospatial Image Service (Twin Cities metro layer). More information at www.mngeo.state.mn.us/chouse/wms/geo_image_server.html

This was formerly a licensed dataset. This data is no longer distributed by the Metropolitan Council on any other media. The original copies of these files on CD were donated to the U of MN Borchert Map Library in 2006.
Online Linkage None available

Section 7 Metadata Reference
Metadata Date 06/25/2015
Contact Person Information Tanya Mayer, GIS Specialist
Metropolitan Council
390 Robert Street North
St. Paul, MN  55101-1805
Phone: 651.602.1604
Email: tanya.mayer@metc.state.mn.us
Metadata Standard Name Minnesota Geographic Metadata Guidelines
Metadata Standard Version 1.2
Metadata Standard Online Linkage http://www.gis.state.mn.us/stds/metadata.htm

This page last updated: 06/25/2015
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