High Resolution Orthophotography (HRO)
High resolution orthorectified images combine the image characteristics of an aerial photograph with the geometric qualities of a map. An orthophoto is a uniform-scale image where corrections have been made for feature displacement such as building tilt and for scale variations caused by terrain relief, sensor geometry, and camera tilt. A mathematical equation based on ground control points, sensor calibration information, and a digital elevation model is applied to each pixel to rectify the image to obtain the geometric qualities of a map.
All HRO imagery has a UTM NAD83 Zone 12 North meters projection. The naming convention for the imagery tiles are
based off the U.S. National Grid (USNG) , opens in a new tab . The .XML files for each image tile contain the metadata for the imagery and CALDATE contains
the date the imagery was flown and collected.
2012 HRO
6-inch (12.5 cm) resolution 4-band aerial photography from the spring of 2012 for the Wasatch Front and mid-summer for the Uintah Basin. Although this imagery is generically referred to as 6-inch imagery it is actually 12.5 centimeter or 4.92 inch resolution. The imagery in the Uintah Basin is 1-foot resolution and was collected June 4th, 2012.
The image tile boundaries and USNG tile names can be viewed in the HRO2012 Index shapefile , opens in a new tab .
2009 HRO
1-foot (25 cm) resolution color aerial photography from 2009 for the Wasatch Front, Canyonlands National Park, and Moab. Although this imagery is generically referred to as 1-foot imagery it is 25 centimeter or 9.84 inch resolution.
The image tile boundaries and USNG tile names can be viewed in the HRO2009 Index shapefile , opens in a new tab .
2006 HRO
1-foot (25 cm) resolution color aerial photography from 2006 for many areas across the state of Utah. Although this imagery is generically referred to as 1-foot imagery it is 25 centimeter or 9.84 inch resolution. Some tiles are incomplete and have black areas as a result of the proximity to the flight boundary.
The image tile boundaries and USNG tile names can be viewed in the HRO2006 Index shapefile , opens in a new tab .
2003 HRO
1-foot resolution color aerial photography from 2003 for the Wasatch Front north of Utah County.
The image tile boundaries and USNG tile names can be viewed in the UAO Index shapefile , opens in a new tab . For more information on the collection take a look at the project metadata , opens in a new tab .