land surveying process

Hydrographical Surveying

Hydrographical survey belongs to the science of measurement and explanation of features which impact maritime navigation, marine construction, dredging, offshore oil exploration/offshore oil drilling and relevant activities. Astronomical Surveying

An astronomical survey refers to a general map or image of a area of the sky which requires a definite observational target. On the other hand, an astronomical survey may contain a set of various images or spectra of objects which contribute to a common type or feature. To get more detailed information, watch the following video tutorial.