Photogrammetry, digital orthophotography, oPhotogrammetry is defined by the American Society for Photogrammetry and Remote Sensing (ASPRS) as “the art, science, and technology of obtaining reliable information about physical objects and the environment, through processes of recording, measuring, and interpreting imagery and digital representations of energy patterns derived from noncontact sensor systems”
(Colwell, 1997:3).
Photogrammetry, as its name implies, is a three-dimensional coordinate measuring technique that uses photographs as the fundamental medium for metrology or measurement. The fundamental principle used in photogrammetry is triangulation.
Digital Photogrammetry
Drone Mapping
This is the use of UAVs to survey an area of land. A surveyor/ drone Operator flies the drone over an area of land, capturing pictures. The end result is then processed with help of computer software to produce a site model. The images are stitched together.
Photogrammetry, digital orthophotography, orthophoto & orthoimage
Photogrammetry is a sophisticated process by which information is extracted from photographs to create accurate three-dimensional maps and models. Using ultra-high-resolution aerial photographs, this practice combines UAV-mounted overhead sensors with powerful GIS mapping systems to create dynamic, measurable documents for a number of real-world situations and uses. Digital photogrammetry operates on images of objects captured from different locations and angles using a standard digital camera, and having the computer detect overlapping patterns to build up a 3D reconstruction of the photographed model
3D Building Models
We offer a suite of 3D building products for 3d visualization, GIS applications and architectural modeling. Our products are accurate, geo-registered (x,y,z) models provided in formats ready for most 3D application tools. Accurate geo-registered 3D “block-style” building models that provide users with block geometry and elevations.
• Accurate geo-registered (x, y, z) models
• Common coordinate systems
• Block geometry with flat roof elevations
• Multiple building roof elevations captured every 33 feet or greater
• Standard building models can also be generic or photo-real textured
• Common output model formats:
• ESRI z-shapefiles, Google KML, AutoCAD (.dwg/.dxf), SketchUp (.skp), Openflight (.flt)