Geodetic Datum Transformation System (GDTS) - Hydrographic Surveying (GLS 614)

   
Geodetic system is a coordinate system, and a set of reference points, used to locate places on the earth. Datums are used in geodesy, navigation, and surveying by cartographers and satellite navigation systems to translate positions indicated on maps to their real position on earth. Each starts with an ellipsoid and then defines latitude, longitude and altitude coordinates. The difference in co-ordinates between datums is commonly referred to as datum shift. Because the Earth is an imperfect ellipsoid, localised datums can give a more accurate representation of the area of coverage.

   In surveying and geodesy, a datum is a reference system or an approximation of the Earth's surface against which positional measurements are made for computing locations. Horizontal datums are used for describing a point on the Earth's surface, in latitude and longitude or another coordinate system. Vertical datums are used to measure elevations or underwater depths. Generally, especially in survey life the coordinate system need to change especially we conduct a survey in different place with different coordinate system to match the data and to gain the good result.

Software Used :

1. GDTS 4.1 
2. GPSCAS 1.02

Our Report and Procedure :

GDTS Report - Hydrographic Surveying

Hydrographic Surveying Syllabus Notes - Hydrographic Surveying (GLS 614)

     Hydrography focuses on the measurement of physical characteristics of waters and conditions of navigable waters and adjoining coastal areas, including oceans, rivers, and lakes. It involves geodesy, physical oceanography, marine geology, geophysics, photogrammetry (in coastal areas), remote sensing, and marine cartography. Basic parameters observed during a hydrographic survey are time, geographic position, depth of water, and bottom type. However, observation, analysis, and prediction of tides and currents area are also normally included in order to reduce depth measurements to a common vertical datum. A principal objective of hydrography is to provide for safe navigation and protection of the marine environment through the production of up-to-date nautical charts and related publications.

 

Lecture Notes :

1. Introduction to Hydrographic Surveying
2. Introduction to Underwater Acoustic
3. SONAR Principles
4. Introduction to Underwater Equipments
5. Underwater Positioning System
6. Geophysical Equipment
7. Interfacing and Sounding Line
8. Tide
9. Tidal Levels and Datums
10. Law of The Sea

Password : WSA1513

Assignment 2 The Basic Principle of LiDAR Bathymetry - Hydrographic Surveying (GLS614)

LiDAR is a Light Detection and Ranging is an optical remote sensing technology that can measure the distance to, or other properties of target by illuminating the target with light using a pulse from a laser. It uses shorter wavelength of EM-spectrum uses to measure properties of scattered light. LIDAR technology has application in many geographic sciences as well as in laser altimetry and LIDAR Contour Mapping. In hydrography, Airborne LiDAR Bathymetry (ALB) has become a conventional method to measure both the topography and bathymetry of nearshore coastal waters and lakes from a low-altitude aircraft using a scanning, pulsed laser beam.

My Assignment File :

Assignment 2 - LiDAR Bathymetry (GLS614)