Modeling of the earth’s surface and extraction of topographic information has become an important research topic in the Remote Sensing and Photogrammetry domain. In the last 18 years high resolution satellites have been providing images with spatial resolution of 1 meter or better, with stereoscopic coverage. They can replace conventional aerial photography for urban mapping, including detailed 3D modeling of buildings. These data are especially important in many developing countries, where for several reasons aerial photography is much more expensive. Many cities in the third world are developing very fast, requiring frequent map updating and assessment of changes in urban areas. Furthermore, fast evaluations are often required, because of the need of near real-time applications, for example in case of natural disasters evaluations.
In the world of geospatial data, the best way to visualize a city is by applying depth rather than just a flat plane surface, this is known as 3D modeling.
Geo surveying services has the capability of producing 3D city models at various levels of detail. These city models can be used in various applications.
When it comes to elevation, we have three different ways to model elevation.
· DEM – Digital Elevation Models
· DSM – Digital Surface Models
· DTM – Digital Terrain Models and even
GeoSurveying Services has a wide experience in the generation of accurate digital terrain and surface models that are used in the production of Orthoimages, 3D city modeling, volume computations, drainage, water flow directions, and many more.
Our range of services covers all your needs: GIS consulting and expertise, Spatial Data Engineering, realization and integration of customized solutions.
Remote sensing is the process of detecting and monitoring the physical characteristics of an area by measuring its reflected and emitted radiation at a distance (typically from satellite or aircraft). Special cameras collect remotely sensed images, which help researchers “sense” things about the Earth.
Orthorectification is the process of removing the distortion within an image caused by terrain relief and the camera. This is done by modeling the nature and magnitude of geometric distortions in the imagery. Camera or satellite models in conjunction with limited ground control, allow construction of correction formulae that produce accurate, geometrically correct, map-oriented imagery. SATPALDA uses Leica Photogrammetric Suite to produce ortho images.
Geo Surveying Services offers various options of terrain datasets for orthorectification. The choice of DTM used for this process depends upon customers accuracy requirements.
The planet is continually being observed and imaged by satellites.
Before 1972, satellites weren’t designed to study or monitor Earth’s surface. Instead, they were mainly used for military missions. Imagery was commercialized in 1984.
Earth observation satellites specifically intended for non-military applications were designed for long-term global observations of the land surface, oceans, biosphere, and atmosphere.
Satellite instruments became equipped to measure vegetation coverage, sea-ice fluctuation, sea level and sea surface temperatures, concentrations of atmospheric gases, and many others. These observations are applied to meteorological forecasting, environmental monitoring, disaster monitoring, and cartographic purposes.
Our support team is committed to providing a consistent level of personalized support to our user community. Support analysts are available and prepared to provide assistance to our customers on first contact.
We understand the changing needs of individuals and businesses, and work with our customers to provide skilled specialists based on customer requirements and schedules
We offer the basic and advanced training courses for surveying and GIS
Types of surveys
Introduction to Global Positioning System, GNSS, RTK, Static, Post Processing, Create 7 Parameters
Levelling – methods, equipment, field procedures, computation and adjustment
Profile surveying – Longitudinal and cross section
Traversing – Types, field procedures, computation and adjustments
Topographic surveying – data format, data downloading/uploading data processing in CAD
Introduction to setting out survey
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