MN GIS/LIS NEWS
The Newsletter of the Minnesota GIS/LIS Consortium
Table of Contents
MN GIS/LIS Consortium
From the Chair
Annual Report Online
GLO Field Note Project
FSA Photos 2010
Metro Air Photo Update
Eagan Tracks Diseased Trees
Goodhue Co Historical Features
GISSO Job Fair Report
2010 Metro Orthoimagery; 2011 Planned Flights in Southern MN
By Chris Cialek, MnGeo
Eleven of thirteen East-Central Minnesota counties were flown this spring for high-resolution 4-band digital imagery from which stereo and ortho-rectified data products will be produced.
The project is being funded by the Minnesota Department of Natural Resources, the Metropolitan Council, the National Geospatial-Intelligence Agency (NGA) and the Metropolitan Mosquito Control District. MnGeo is managing federal and vendor contracts and interagency agreements.
Surdex Corporation began flying on April 7. Due to early spring weather, flights were curtailed after April 18. Data collection status:
Wright, Sherburne, Isanti and Chisago counties were collected at 20-inch resolution, the nominal resolution specified by the DNR and Met Council.
Anoka, Carver, Hennepin, Ramsey and Washington counties were collected at 1-foot resolution thanks to a grant from the NGA, which requires that resolution to support its 133 Urban Areas Program.
Dakota and Scott counties took advantage of this regional data collection opportunity to buy up to a 6-inch resolution.
Rice and Goodhue counties, which were scheduled for 20-inch resolution coverage, were not collected so will be rescheduled for Spring 2011
The state is also exercising an unsolicited option proposed by the vendor for increased horizontal accuracy.
Figure 1. The 2010 East_Central Minnesota ortho imagery project contains 13 counties. Data were collected at three resolutions. Due to early Spring weather, two counties were not flown this year and are scheduled for flights in 2011.
Image processing is currently underway, including aerial triangulation (the calculation of true ground co-ordinates allowing aerial imagery to be properly aligned and geo-referenced), color balancing and creation of county composite mosaics.
2011 Planned Flights in Southern MN
Thirty-six southern Minnesota counties will be flown next spring as the next phase of this project (see map). Informational materials are being prepared and two or three regional meetings are being planned to gauge interest in local partnerships.
Figure 2. Anticipated data collection schedule for statewide high resolution ortho-imagery collection in Minnesota.