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This page last updated: 11/12/2003
Metadata created using Minnesota Geographic Metadata Guidelines
| Originator | Metropolitan Council |
| Abstract | This dataset contains 267 black and white digital 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 115 Mb, with a .6 meter image pixel, and available in TIFF format. There are a total of 78 CD-ROMs. These orthophotos were produced using the USGS DOQ specifications except for the file format and the scan resolution (pixel size is .6m rather than 1 meter). The original imagery was collected at 20,000 ft. and centered on USGS quarter-quads. |
| Browse Graphic | View a sample of the data. |
| Time Period of Content Date | 05/2000 |
| Currentness Reference | The dates of the original aerial photography were May 1, 2000 (West Half of the metro) and May 2, 2000 (East Half of the metro). |
| Access Constraints | Subject to License Agreement with the Metropolitan Council. |
| Use Constraints | Subject to License Agreement with the Metropolitan Council. |
| Distributor Organization | Metropolitan Council |
| Ordering Instructions | For more information about about licensing and purchasing the data, go to http://gis.metc.state.mn.us/data_information/order_info_doq.asp or call the Metropolitan Council Regional Data Center at 651-602-1140. To view DOQs online, see the DataFinder orthophoto online mapping application at http://www.datafinder.org/website/DF_Orthophotos/viewer.htm . (You will need to zoom in significantly before orthophotos will apprear.) This application includes the DOQs, highways, and quadrangle boundaries which may help you select the quadrangle that contains the DOQs you want to order. Additionally, this dataset is available for direct use via one or more map services. More information about what a web mapping service is can be found at http://www.datafinder.org/services/ . The specific map service and layer name for this dataset can be found by clicking the blue or green boxes under the map service column of the DataFinder Catalog at http://www.datafinder.org/catalog/ . |
| Online Linkage | none available |
Go to Section:
1. Identification Information
2. Data Quality Information
3. Spatial Data Organization Information
4. Spatial Reference Information
5. Entity and Attribute Information
6. Distribution Information
7. Metadata Reference Information
| Section 1 | Identification Information | Top of page | ||
| Originator | Metropolitan Council | |||
| Title | 2000 Digital Orthophotos, Twin Cities Metropolitan Area | |||
| Abstract | This dataset contains 267 black and white digital 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 115 Mb, with a .6 meter image pixel, and available in TIFF format. There are a total of 78 CD-ROMs. These orthophotos were produced using the USGS DOQ specifications except for the file format and the scan resolution (pixel size is .6m rather than 1 meter). The original imagery was collected at 20,000 ft. and centered on USGS quarter-quads. | |||
| Purpose | The digital orthophotos will be used for the 2000 Metropolitan Council land use interpretation project as well as for many other mapping and analysis functions. A note about zooming: The scale of the original photos (from which the digital data were created) was 1:40,000. Generally photogrammetrists suggest that the integrity of a photo image degrades noticeably after 5 times the negative scale (1:8,000 in this case), and that 10 times the negatives scale is the absolute maximum one should enlarge a photo (1:4,000). |
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| Time Period of Content Date | 05/2000 | |||
| Currentness Reference | The dates of the original aerial photography were May 1, 2000 (West Half of the metro) and May 2, 2000 (East Half of the metro). | |||
| 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 again by 2005. | |||
| 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 -92.69 45.44 44.44 |
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| Place Keywords | Twin Cities, Anoka County, Carver County, Dakota County, Hennepin County, Ramsey County, Scott County, Washington County | |||
| Theme Keywords | orthophotography, ortho, orthophotos, DOQ, DOQQ, imagery, images, digital ortho, aerial photography, aerial photos, digital aerial photography | |||
| Theme Keyword Thesaurus | ||||
| Access Constraints | Subject to License Agreement with the Metropolitan Council. | |||
| Use Constraints | Subject to License Agreement with the Metropolitan Council. | |||
| Contact Person Information | Tanya Mayer,
GIS Coordinator Metropolitan Council 390 Robert Street North St. Paul, Minnesota 55101-1805 Phone: 651-602-1604 FAX: 651-602-1674 E-mail: tanya.mayer@metc.state.mn.us | |||
| Browse Graphic | View a sample of the data. | |||
| Browse Graphic File Description | Sample map showing the 2000 digital orthophoto layer. | |||
| Associated Data Sets | 1997 Metropolitan Council Digital Orthophotos, 1991 USGS DOQs |
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| Section 2 | Data Quality Information | Top of full metadata | Top of page | |
| Attribute Accuracy | ||||
| Logical Consistency | ||||
| Completeness | Entire seven county metro area is covered. | |||
| Horizontal Positional Accuracy | NMAS @ 1:12,000 scale, 90% of well-defined points fall within 33.3 ft | |||
| Vertical Positional Accuracy | Not applicable | |||
| Lineage | Orthophotos were developed under contract with MARKHURD Inc. The contractor acquired new, vertical black and white aerial photography at a photo scale of 1=3333' (1:40,000 scale or at an altitude of 20,000 ft), following the USGS NAPP specifications. There were 22 flight lines, 612 exposures, 590 exposures used for aerotriangulation (AT), 60% forward overlap and 30% side lap, flown in a north/south orientation covering the project area. The contractor acquired and processed airborne GPS data for the center of each photo. This was used as input in to the AT solution. The contractor scanned each film diapositive at a setting of 14 microns to yield a 2' ground resolution pixel size (.6 meter). TIFF images were exported for use in the softcopy workstation for the AT and ortho processing. A Fully Analytical Aerotriangulation (AT) of the aerial photography was developed to be used in the orthorectification process. This increases the density of the ground control network, verifies the accuracy of the GPS survey check points, and provides independent comparison of the existing ground control points. The Council provided the USGS 30 Meter DEM to the contractor in ArcInfo GRID and in ASCII format, in UTM, NAD 83, horizontal units in meters, vertical units (Z-units) in feet, tiled by USGS quadrangle. The DEM files are used in the orthorectification process. The contractor used a softcopy process to create the final digital orthophotos. Digital Orthophoto Quarter-Quads were developed following the USGS standards for digital orthophotos (DOQs) with the exception of pixel resolution (.6 meter), file format (TIFF with world files). USGS header (.hdr) file were not included as a deliverable. 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. Each image is approximately 115 Mb, with a .6 meter image pixel, and available in TIFF format. There are a total of 78 CD-ROMs. These orthophotos were produced using the USGS DOQ specifications except for the file format and the scan resolution (pixel size is .6m rather than 1 meter). The original imagery was collected at 20,000 ft. and centered on USGS quarter-quads. |
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| Source Scale Denominator | 40000 | |||
| Section 3 | Spatial Data Organization Information | Top of full metadata | Top of page | |
| Native Data Set Environment | ||||
| Geographic Reference for Tabular Data | ||||
| Spatial Object Type | Raster | |||
| Vendor Specific Object Types | ||||
| Tiling Scheme | 3.75 minute quadrangle sheets (USGS 7.5 minute ''quarter quads'') | |||
| Section 4 | Spatial Reference Information | Top of full metadata | Top of page | |
| Horizontal Coordinate Scheme | UTM | |||
| Ellipsoid | GRS80 | |||
| Horizontal Datum | NAD83 | |||
| Horizontal Units | Meters | |||
| Distance Resolution | ||||
| Altitude Datum | NAVD88 | |||
| Altitude Units | Meters | |||
| Cell Width | 0.6 | |||
| Cell Height | 0.6 | |||
| UTM Zone Number | 15 | |||
| Section 5 | Entity and Attribute Information | Top of full metadata | Top of page | |
| Entity and Attribute Overview | |
| Entity and Attribute Detailed Citation | ||||
| Section 6 | Distribution Information | Top of full metadata | Top of page | |
| Publisher | Metropolitan Council | |||
| Publication Date | 10/2000 | |||
| Contact Person Information | Regional Data Center Metropolitan Council 390 Robert Street North St. Paul, Minnesota 55101-1805 Phone: 651-602-1140 FAX: E-mail: datacenter@metc.state.mn.us |
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| Distributor's Data Set Identifier | orthos2000 | |||
| Distribution Liability | See Metropolitan Council GIS Data Base License Agreement | |||
| Transfer Format Name | TIFF (.tif) with world files (.tfw) for geographic reference. | |||
| Transfer Format Version Number | TIFF version 6.0 | |||
| Transfer Size | Approximately 115 Mb per quarter-quadrangle | |||
| Ordering Instructions | For more information about about licensing and purchasing the data, go to http://gis.metc.state.mn.us/data_information/order_info_doq.asp or call the Metropolitan Council Regional Data Center at 651-602-1140. To view DOQs online, see the DataFinder orthophoto online mapping application at http://www.datafinder.org/website/DF_Orthophotos/viewer.htm . (You will need to zoom in significantly before orthophotos will apprear.) This application includes the DOQs, highways, and quadrangle boundaries which may help you select the quadrangle that contains the DOQs you want to order. Additionally, this dataset is available for direct use via one or more map services. More information about what a web mapping service is can be found at http://www.datafinder.org/services/ . The specific map service and layer name for this dataset can be found by clicking the blue or green boxes under the map service column of the DataFinder Catalog at http://www.datafinder.org/catalog/ . |
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| Online Linkage | none available | |||
| Section 7 | Metadata Reference Information | Top of full metadata | Top of page | |
| Metadata Date | 11/12/2003 | |||
| Contact Person Information | Tanya Mayer,
GIS Coordinator Metropolitan Council 390 Robert Street North St. Paul, Minnesota 55101-1805 Phone: 651-602-1604 FAX: 651-602-1674 E-mail: tanya.mayer@metc.state.mn.us |
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| 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: 11/12/2003
