Topographic survey, Cartographies and Cadastres.Digital models and Satellite topographies.
SOLUTIONS
Digital models and Satellite topographies
Topographies and cartography
Satellite surveying, also known as satellite surveying or remote sensing, is performed using global positioning system (GPS) technologies, Earth observation satellites, and geographic information systems (GIS).
By using optical satellite images it is possible to carry out a photogrammetric restitution process to obtain topographic and cartographic products such as:
- Topographic map: 1 m accuracy.
- Digital terrain model (MDT): accuracy 50 cm.
- Digital elevation model (MDE): accuracy 50 cm.
- Cartographies: Land use plan.
- Cartographies: Identification plan of polygons or lines of interest such as buildings, linear infrastructure, bodies of water, etc.
Cadastres
Cadastral updating with satellite involves the use of satellite images and remote sensing technologies to obtain updated information on land properties and use in a given area through the following process:
- Definition of the study area and objectives of the update such as detecting changes in the property, new constructions, changes in land use, etc.
- Selection of satellites and sensors: QuickBird, WorldView, Pleaides, Landsat, Sentinel, among others, are frequently used.
- Satellite Data Acquisition: High resolution satellite images of the area of interest are acquired. The frequency of acquisition may depend on how quickly changes occur in the area.
- Image Processing: Georeferencing and radiometric and geometric corrections to improve the precision and quality of the images.
- Analysis and Detection of Changes: Analysis of differences, classification of land use and identification of structural changes.
- Integration with the Cadastral Database to update it with the new information obtained with the objective of including changes in property boundaries, new buildings, changes in land use, etc.