Aerial Data Acquisition
Aerial photography has existed for well over a century and occupies a special place among the many segments of photography, not only because of a history dating back to the earliest periods of photographic discovery but also for the images aerial photographers were able to capture that would not have been attainable from any other perspective.
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Image Processing
Groupe Alta's specialized personnel utilize state-of-the-art technologies and equipement to process and enhance all images prior to customer delivery.
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LiDAR
The revolutionary multi-pulse technology incorporated within the ALTM Gemini, gives users the ability to double conventional operating altitudes without compromising data density. With an effective pulse repetition rate of up to 165 KHz and the latest in inertial technology, the ALTM Gemini maximizes base mapping collection efficiency for a wide range of applications.
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Georeferencing
Georeferencing is used to “reference” something to define its existence in physical space. That is, establishing a relation between raster or vector images to produce accurate map projections or to coordinate systems. When data from different sources need to be combined and then used in a GIS application, it becomes essential to have a common referencing system.
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Aerial Triangulation
The purpose of aerial triangulation is to produce from ground control, sufficient points in the photogrammetric models to ensure these are oriented accurately to ground coordinates as required for stereo compilation in either orthophoto or mapping products.
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GPS & IMU Georeferencing
Groupe Alta’s aircraft is equipped with Applanix airborne GPS/IMU systems that record the position and orientation of our cameras during the aerial acquisition mission. Aerial triangulation is usually not required when using GPS & IMU technologies.
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Photogrammetry
Historically, photogrammetry is as old as photography itself, and dates all the way back to the mid-nineteenth century. Photogrammetry is the first remote sensing technology ever developed, in which geometric properties about objects are determined from photographic images. Today all kinds of photogrammetry applications are widely spread and are used to identify all objects in terms of what they are, what type, quality and quantity, in addition to their location, form and size.
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Customized Mapping Solutions
Our team of specialists provide you with customized digital mapping products, including digital terrain, elevation and surface models, urban maps, orthophotos, orthomosaics, 3D models and more... Groupe Alta has provided quality mapping products at all scales and resolutions for numerous GIS applications and users around the world for over 50 years.
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