Orthophotography

Geophex Surveys has extensive experience producing orthophotography for projects of all sizes ranging from small sites to large multi-county and water district projects. Our refined production processes and experienced staff ensures that our clients receive the highest quality orthophotography available.

Natural Color Orthophotography

Natural color orthophotography is the most commonly requested type of orthophotography and consists of 3-band (RGB) imagery that has undergone aerial triangulation processing and been rectified to an elevation model. Pixel resolution varies from approximately 3-inches to 3-feet depending on the source (aircraft or satellite), requirements of the project and level of detail required. Geophex Surveys also color balances, radiometrically corrects and seamlessly mosaics the orthophotogaphy to provide a tonally consistent and aesthetically pleasing product.

Orthophoto accuracy is defined by the requirements of the project and is dependent on several factors including flying height, terrain, DEM quality and the use and distribution of ground control points. For projects that require medium accuracy or are over inaccessible areas, the aerial triangulation can be processed utilizing only the airborne positioning and orientation data (or satellite ephemeris data), whereas projects requiring high accuracy will require establishment or use of existing surveyed ground control points.

Near Infra-Red Orthophotography

The near infra-red band of imagery is available on many modern large format digital aerial photography cameras and is often captured simultaneously with the Red, Green, Blue Bands (Natural Color) as a fourth band and delivered to the client as an RGBNiR file. Applications of near infra-red orthophotography include vegetation studies, moisture analysis, impermeable surface analysis and engineering design.