Remote sensing is an object or phenomenon related distanced information gathering, without any contact with them (at a distance). Now, the term refers to the technologies of aerial data acquisition, based on the use of sensors enabled to recognize objects on the earth's surface (and on / under the water surface and in the atmosphere), emitting or reflecting waves in different bands. Remote sensing can be divided into two categories - passive and active. In passive sensing (perception of the signal), the sensor captures the signal emitted or reflected by an object (mainly sunlight).
These sensors are cameras (including digital), thermal imagery device, passive sonars, radiometers, seismographs, etc. When in the active mode, the sensor emits a signal, and then registers its reflection from the object. These sensors include laser scanners, radars and sonars.
Data processing includes:
Integration of terrain and vector objects3D-models
Processed remote data allows quick and efficient fulfillment of the following tasks:
Textured orthophotomaps triangulation terrain model. Location - Republic of Tuva, south-west of the town of Kyzyl
TIN (triangulated irregular network) model presented as a wireframe.
Engineering surveys, airborne laser scanning, digital aerial photography, creating digital elevation models (DTM), orthophotos and special topographic maps scale 1:1000 and special topographic plan of scale 1:500.
Engineering investigations using mobile laser scanning (MLS), terrestrial laser scanning (TLS) on the "Moscow - Saint-Petersburg" railway line.
Engineering investigations, MLS and MLS –based development of 3D-models and digital topographic mapping(scale 1:1000) of 1400 km of the Moscow railway network and infrastructure.
Engineering investigations based onaerial laser scanning data of the center part of the Ulug-Khem coal basin in the Republic of Tuva.
Obtained as a result of laser scanning, a three-dimensional model of an urban land area has been complemented by data on the underground utility lines and attribute-based information.
This consists of a combined application of three-dimensional modeling technology with date obtained by aerial photography, terrestrial surveys and thermal imaging, as well as the application of automated pipelines tracing to the engineering design, construction and operation of pipelines.
The video presentation highlights the mobile laser scanning (point cloud) data obtained by the railway survey. The points can be textured based on the color of the photographs obtained by scanning with the digital cameras integrated into the system, as well as colorized in accordance with various parameters, such as laser reflection intensity or elevation.
The process of surveying with the use of a mobile laser scanner; system mounting and dismounting on a vehicle; an example of the data obtained during the survey.