| Section 1 | Overview | |||
| Originator | U.S. Geological Survey (USGS) | |||
| Title | USGS High Resolution Orthoimagery, Minneapolis - St. Paul, MN, Spring, 2008 | |||
| Abstract | This dataset consists of 0.3-meter pixel resolution (approximately 1-foot), natural color orthoimages covering the Minneapolis-St. Paul urban area footprint.
An orthoimage is remotely sensed image data in which displacement of features in the image caused by terrain relief and sensor orientation have been mathematically removed. Orthoimagery combines the image characteristics of a photograph with the geometric qualities of a map. [Note: this metadata record was reformatted at the Minnesota Geospatial Information Office (MnGeo) from the record provided by USGS - several of the fields were changed to reflect MnGeo's seamless WMS data delivery] | |||
| Purpose | These data have been created as a result of the need for having geospatial data immediately available and easily accessible in order to enhance the capability of Federal, State, and local emergency responders, as well as plan for homeland security efforts. | |||
| Time Period of Content Date | 04/23/2008 | |||
| Currentness Reference | Data collected in 2008 | |||
| Progress | Complete | |||
| Maintenance and Update Frequency | Unknown | |||
| Spatial Extent of Data | Minneapolis and St. Paul, Minnesota (Twin Cities metropolitan area) | |||
| Bounding Coordinates | -93.3109 -93.0253 45.0135 44.8384 | |||
| Place Keywords | Minnesota, MN, Twin Cities metropolitan area, Minneapolis, St. Paul, Saint Paul | |||
| Theme Keywords | imageryBaseMapsEarthCover, orthophoto, air photo, aerial photo, aerial photography, image map | |||
| Theme Keyword Thesaurus | ISO 19115 Topic Category | |||
| Access Constraints | Any downloading and use of these data signifies a user's agreement to comprehension and compliance of the USGS Standard Disclaimer. Insure all portions of metadata are read and clearly understood before using these data in order to protect both user and USGS interests. | |||
| Use Constraints | Acknowledgement of the USGS as a data source would be appreciated in products developed from these data, and such acknowledgment as is standard for citation and legal practices for data source is expected by users of this data. Sharing new data layers developed directly from these data would also be appreciated by USGS staff. Users should be aware that comparison with other data sets for the same area from other time periods may be inaccurate due to inconsistencies resulting from changes in photo-interpretation and mapping conventions over time. Users should be aware that temporal changes may have occurred since this data set was collected and that some parts of this data may no longer represent actual surface conditions. Users should not use this data for critical applications without a full awareness of it's limitations. These data are not legal documents and are not to be used as such. | |||
| Contact Person Information | Customer Services,
U.S. Geological Survey EROS Data Center, 47914 252nd Street Sioux Falls, SD 57198-0001 Phone: 800-252-4547 Fax: 6055946589 Email: custserv@usgs.gov | |||
| Browse Graphic | None available | |||
| Associated Data Sets | For information on other air photos available for Minnesota, see https://www.mngeo.state.mn.us/chouse/airphoto/index.html | |||
| Section 2 | Data Quality | |||
| Attribute Accuracy | ||||
| Logical Consistency | GeoTIFFs conform to the specifications set forth by the USGS for the similar production of 133 Urban Areas orthophotos. | |||
| Completeness | Orthoimages are visually inspected for completeness to ensure that no gaps or image misplacements exist within and between adjacent images. These images are derived by mosaicking multiple images to ensure complete coverage. Source imagery is cloud free. | |||
| Horizontal Positional Accuracy | The ortho-rectified image frames and mosaics have a horizontal positional accuracy not exceeding 3 meters root mean square error (RMSE) XY (2.12 meter RMSE x or y) for 95% of measured points according to National Standard for Spatial Data Accuracy (NSSDA) guidelines. The Band Co-Registration offsets are less than 1 pixel. No double-images or ghosts from interleaving of overlapped image frames are present.
Approximately twenty (20) photo identifiable control points were measured in the orthos and compared to the surveyed locations to ensure the horizontal accuracy. | |||
| Vertical Positional Accuracy | N/A | |||
| Lineage | USGS Processing Steps, April 2008
All photography was acquired using film cameras and accompanied by the collection of airborne Global Positioning System (GPS) data. All imagery was collected using Inertial Measurement Units (IMU) as a means to control the imagery. Orthorectification was performed with Intergraph's ImageStation OrthoPro software and the USGS National Elevation Dataset was used for the elevation model. Digital orthophotos were also radiometrically balanced in Intergraph's OrthoPro software. Land Management Information Office (LMIC), now MnGeo, Processing Steps, August 2008 USGS delivered the imagery to the Land Management Information Center (now MnGeo) in TIF format in 195 tiles with no overlap. LMIC staff read them directly into a database and serves the images over the web via a WMS server in JPG format. | |||
| 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 | 0.3 | |||
| Cell Height | 0.3 | |||
| Section 5 | Attributes | |||
| Overview | The original dataset consists of natural color imagery orthorectified to .3 meter pixel resolution, mosaicked into 1,500m tiles and delivered in GeoTIFF format. [Imagery delivered from MnGeo's site is in JPG format] | |||
| Detailed Citation | ||||
| Table Detail: | ||||
| Section 6 | Distribution | |||
| Publisher | Minnesota Geospatial Information Office (MnGeo) and USGS | |||
| Publication Date | 08/21/2008 | |||
| Contact Person Information | MnGeo, GIS Specialist
Minnesota Geospatial Information Office (MnGeo) 658 Cedar Street St. Paul, MN 55155 Phone: 651-201-2499 Email: gisinfo.mngeo@state.mn.us | |||
| Distributor's Data Set Identifier | doq_msp08, Twin Cities high resolution DOQs 2008 | |||
| Distribution Liability | 1. USGS disclaimer: Although these data have been processed successfully on a computer system at the USGS, no warranty expressed or implied is made by the USGS regarding the use of the data on any other system, nor does the act of distribution constitute any such warranty. Data may have been compiled from various outside sources. Spatial information may not meet National Map Accuracy Standards. This information may be updated without notification. The USGS shall not be liable for any activity involving these data, installation, fitness of the data for a particular purpose, its use, or analyses results.
MnGeo's data disclaimer is online: https://www.mngeo.state.mn.us/chouse/disclaimer.html | |||
| Ordering Instructions | 1. MnGeo's Geospatial Image Server
The imagery is available to view via WMS (Web Mapping Service) from MnGeo's Geospatial Image Server. Click on 'Online Linkage' field below to see a webpage that provides the url to connect to the Geospatial Image Server as well as information about how to use WMS services. 2. NorthStar Mapper View and download imagery from MnGeo's NorthStar Mapper online interactive map at: https://www.mngeo.state.mn.us/chouse/northstarmapper.html After you click on "Start Mapping", find these photos as the "USGS Twin Cities Air Photos 2008" layer under "Air Photos and Basemaps" For help using NorthStar Mapper, see: https://www.mngeo.state.mn.us/chouse/northstarmapper_help.html 3. EarthExplorer USGS distributes archived air photos from their EarthExplorer site at: http://earthexplorer.usgs.gov Search for Dataset Name: 200804_minneapolis-st_paul_mn_0x3000m_utm_clr under "Additional Criteria". For help using EarthExplorer, see: http://earthexplorer.usgs.gov/help/ | |||
| Online Linkage | I AGREE to the notice in "Distribution Liability" above. Clicking to agree will either begin the download process, link to a service, or provide more instructions. See "Ordering Instructions" above for details. | |||
| Section 7 | Metadata Reference | |||
| Metadata Date | 12/31/2014 | |||
| Contact Person Information | MnGeo, GIS Specialist
Minnesota Geospatial Information Office (MnGeo) 658 Cedar Street St. Paul, MN 55155 Phone: 651-201-2499 Email: gisinfo.mngeo@state.mn.us | |||
| Metadata Standard Name | Minnesota Geographic Metadata Guidelines | |||
| Metadata Standard Version | 1.2 | |||
| Metadata Standard Online Linkage | https://www.mngeo.state.mn.us/committee/standards/mgmg/metadata.htm | |||