High Resolution Orthoimagery

High resolution orthorectified images combine the image characteristics of an aerial photograph with the geometric qualities of a map. An orthoimage 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.

A digital orthoimage may be created from several photographs mosaicked to form the final image. The source imagery may be black-and-white, natural color, or color infrared with a pixel resolution ranging from 6" to 1-meter. With orthoimagery, the resolution refers to the distance on the ground represented by each pixel.

Georeferenced orthoimages support a variety of geographic information analysis and mapping applications, and provide the foundation for most public and private Geographic Information Systems (GIS).

Orthoimagery is available for download in a Mr.Sid File Format (SID).

Florida Statewide Base Digital Orthophoto Program

The High Resolution Orthoimagery collection has been acquired in partnerships with other state, or regional agencies. Primarily, the data will be 1 foot resolution in a 5000' x 5000' tiling scheme using the State Plane Coordinate System. Some data may be a different resolution, file size, and projection based on the needs of the county. Image Services maintains and distributes this orthoimagery, which can include black-and-white, natural color, and color infrared.