Geomatics Engineering
What is Geomatics Engineering?
Data that describes both the location and the geographic or spatial distribution of features and events.
Key formula / rule: Distance Formula (2D)
Key points
- Understand the principles of surveying and its various methods.
- Learn about geodesy and Earth's reference systems.
- Comprehend photogrammetric principles and applications.
- Grasp the fundamentals of remote sensing and image interpretation.
Common exam trap
Confusing map projections and their inherent distortions.
Definitions
- Term
Geospatial Data
- Meaning
Data that describes both the location and the geographic or spatial distribution of features and events.
- Term
Datum
- Meaning
A reference system or model used to define the position of a coordinate system on the Earth's surface.
- Term
Map Projection
- Meaning
A systematic transformation of the latitudes and longitudes of locations from the surface of a sphere or spheroid into locations on a plane.
- Term
Remote Sensing
- Meaning
The science and art of obtaining information about an object, area, or phenomenon through analysis of data acquired by a device that is not in contact with the object, area, or phenomenon under study.
- Term
GIS
- Meaning
A system designed to capture, store, manipulate, analyze, manage, and present all types of geographically referenced data.
- Term
GNSS
- Meaning
A satellite system that provides autonomous geospatial positioning with global coverage. Includes GPS, GLONASS, Galileo, BeiDou.
- Term
Accuracy
- Meaning
The ° of closeness of measurements of a quantity to that quantity's actual (true) value.
- Term
Precision
- Meaning
The ° to which repeated measurements of the same quantity agree with each other.
Learning objectives
Understand the principles of surveying and its various methods.
Learn about geodesy and Earth's reference systems.
Comprehend photogrammetric principles and applications.
Grasp the fundamentals of remote sensing and image interpretation.
Understand GIS concepts, data models, and spatial analysis techniques.
Learn about GNSS principles and positioning methods.
Formulae
- Name
Distance Formula (2D)
- Note
Used in plane surveying for calculating horizontal distances.
- Expression
d = sqrt((x2-x1)2 + (y2-y1)2)
- Name
Elevation Difference (Leveling)
- Note
BS = Backsight, FS = Foresight. Used in differential leveling.
- Expression
Elevation(B) = Elevation(A) + BS - FS
- Name
Area by Coordinates (Surveying)
- Note
Used for calculating area from coordinates of vertices.
- Expression
Area = 0.5 * |(x1y2 + x2y3 + ... + xny1) - (y1x2 + y2x3 + ... + ynx1)|
- Name
Scale Factor
- Note
Relates measured distances to actual distances on the ground.
- Expression
Scale Factor = Measured Distance / True Distance
- Name
Central Meridian Convergence (UTM)
- Note
Correction for grid bearing in UTM projection.
- Expression
CM Convergence = (Easting - 500000) * tan(Latitude) / Radius of Earth
- Name
Scale Distortion in Map Projection
- Note
Indicates how scale changes across a map projection.
- Expression
Scale Distortion = (Scale on Map) / (Scale on Globe)
Prerequisites
Basic Mathematics (Trigonometry, Algebra)
Physics (Optics, Waves)
Computer Fundamentals
Basic understanding of Earth sciences.
Common mistakes
Confusing map projections and their inherent distortions.
Incorrectly applying coordinate systems or datums.
Overlooking the importance of data accuracy and precision in surveying.
Misinterpreting spectral signatures in remote sensing data.
Keywords
Geomatics
Surveying
Geodesy
Photogrammetry
Remote Sensing
GIS
GPS
GNSS
Spatial Data
Coordinate Systems
Map Projections
Datums
Accuracy
Precision
Geospatial Analysis
Cartography
Remote Sensing Satellites
Digital Elevation Model (DEM)
Vector Data
Raster Data
Practice preview
What is the process of determining the relative positions of points on or near the Earth's surface called?…
easy
Which type of surveying is used when the curvature of the Earth is taken into account?…
easy
Which of the following statements is INCORRECT regarding the principles of surveying?…
medium