subject: Photogrammetry, Aerial Triangulation, Lidar [print this page] Basically, photogrammetry can be referred as the science of making accurate measurements from photographs which form the input information. We obtain the outputs of photogrammetry as maps, drawing, measurement, or a 3D model of some real-world object or even a scene. Many of the maps in use today are either made from photographs taken from aircrafts or the maps crested using photogrammetry. Though there are many methods to classify photogrammetry, a basic method is to divide the area based on the location of the camera used to take the photographs. One of the main divisions of photogrammetry is Aerial Photogrammetry.
Aerial Photogrammetry needs the camera to be mounted in an aircraft. Numerous overlapping photos of the ground are taken from the aircraft. The photos thus obtained are used in the automated processing for Digital Elevation Model (DEM) creation.
Through the application of aerial triangulation in aerial photogrammetry, we can make an assessment of 3-dimensional coordinates for elements on almost any object. Some points with known position which can be seen in the photographs are required. These are called ground control points which need to be an important factor in aerial triangulation. The basic inputs of aerial triangulation are Scanned Images, Camera Report, and Ground Control Data/ Ground Control Point
An accurate and convenient way to capture elevation information is LiDAR technology. LiDAR data can be processed directly producing detailed bare earth models in multiple formats. The solutions and services of SBL help in creating operational efficiency, improved decision-making and a competitive edge to the clients worldwide.
SBL Geomatics, the Geomatics division of Infopark-based ITES company in Cochin, India, provides complete solutions for all standard tasks in digital photogrammetry services such as aerial triangulation, DEM / DTM generation, photogrammetry mapping, stereo compilation, topographic and planimetric feature extraction, orthophoto production, color balancing, mosaicking and tile generation, pan sharpening, contour generation, 3D terrain visualization, orthophotography services and LiDAR data processing. SBLs services allow accurate and cost-effective data collection that proves to be an important input for planning and designing of photogrammetric GIS projects.
