Beginning in the 6th century BC, geodesy was enlightened by Eratosthenes, a prominent Greek astronomer who discovered the globe in spherical form and measured the length of the meridian. It has opened up a new era for geodetic research. Typically, in the 13th to 19th centuries, China has found a compass, the cartographer of Mercator, the corner to draw maps or the scientist Venice has set itself on the leash, and in recent decades new achievements in science and technology have made geodesic science a thriving step- Remote sensing (remote sensing) has allowed mapping from aerial photographs, satellite imagery. Many industrialized countries have produced many small, high-precision geodetic probes, using electronic calculators to solve large-scale geodesy problems, etc. The latest achievements of science applied in surveying. So what is geodesy? What is the role of geodesy?
Surveying, surveying or measuring is generally the science of the Earth – measuring coordinates and elevation, shape, size, the direction of terrain and terrain on the ground. In addition, the products of the industry have important contributions and are closely related to many fields of society, especially in the field of: mapping national cadastral, research and planning, design, construction works, land management, mineral resources management, forest management, climate change management, traffic management, electricity, telecommunications, irrigation ….
These are divided into the following groups:
Surveying and mapping: is the field mapping and surveying services for civil purposes – cadastral work, construction planning … and military service as coordinates in the South China Sea.
The geodetic survey is the survey of the design before, during and after the construction. Monitoring of displacement monitoring and prediction of deformation of works, foundations throughout the life of the project. Instruments are mainly measured by conventional surveying machines: theodolite, water leveling machine, laser dimming machine, electronic totaling machine, etc.
Photogrammetry: This is a field study of the mapping of airplanes, terrestrial imagery, satellite imagery, using imagery instead of traditional methods to build specialized maps. for land management. At the same time, the land surveyor will process the results of the survey.
Higher geodesy: is a global scale measurement used to apply or solve global problems.
Mining geodesy: This sector has its own characteristics and is divided into two minor disciplines: mining geodesy – works and application of geo-informatics in researching and monitoring natural resources. To detect and conduct the prediction of the location of ore mines and minerals.
Remote Sensing: This is a subdivision of surveying from aerial photography (aircraft, …) after the flight, by ship (drawing continental shelf, ocean floor, …). Measurement tools can be cameras, ultrasound devices, radio radar, …
Satellite positioning (GPS): locating and geotagging (special remote sensing)
Geographic Information System (GIS): is specialized in software and geographic databases (information technology).
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