GRB

Based on HK80 datum, it is a territorial grid constructed on the Transverse Mercator Projection

Referred sea depths of Hong Kong, sitauated at 1.38m below Mean Sea Level.

Referred land levels for Hong Kong, situated at 1.23m below Mean Sea Level.

It is established through survey of measuring horizontal distances and angles to maintain horizontality of traverse survey.

Points' real positions are known exactly in some XY coordinate systems.

Collection of points on Earth with identified position defined in North-South direction and East-West direction.

Horizontal component of DOP (Latitude, Longitude).

This projection is used to prove the point that although a projection may preserve areal integrity, it may not preserve shape integrity and can render the map illegible.

HandOver Word

High Precision Geodetic Networks

Hue Saturation Lightness

Hue Saturation Value

Horizontal Time Dependent Positioning

Shade of colour.

Errors incured by observer causing inaccuracy in measurements, which can be minimized through multiple observations or stict procedures.

Hyperspectral Digital Image Collection Experiment

A measure for efficiency of flow in a channel.

Measure of frictional resistance water (fluid) can experience when passing over features (e.g. land, channel).

An oscillator that uses the properties of hydrogen atom to serve as a frequency reference.

Surveys to define shoreline and water depths in water bodies (e.g. lake, streams, reservoirs, oceans, etc…)

Measurements and description of features that can affect maritime navigation.

See definition on Water Cycle.

Microphone designed to be used underwater to pickup underwater sound.

Hyperspectral mapping, a system with an across-track aerial hyperspectral scanner established by Intergrated Spectronics with up to 200 available bands

Smoth curve on a plan defined by geometric equations for which there is a solution set.

Analogs of the ordinary trigonometric or circular functions.

Positioning method using radio signals transmitted by two different stations, where the difference in received signals is claculated and recorded, the loactions with same amount of time differences are plotted as a line.

Technique for collecting and processing information using electromagnetic spectrum, where each pixel on the image will have a spectrum to help with identifying objects.

Obtain images in many narrow contiguous spectral bands throughout the visible,near-infrared,mid-infrared and thermal infrared by hyperspectral sensors.

Usually seen together with contour lines, it is used to indicate elevation ranges as bands of colours.

Input/Output

Metadata category, information about dataset (e.g., title, geographic coverage, etc…)

Recognizing ideas, concepts and situations within domain of study.

Topological overlay to calculate the intersection of two or more layers.

Integrated Data Management System

Intermediate Frequency

Instantaneous Field of View

Rock formed from the coolding and solidification of magma or lava.

Intermediate Level

Representation of real-life situations on a medium.

The implementation of standard arithmetic operations, such as addition, subtraction, multiplication, and division, on images.

See the description of Classification.

Procedures aim to reduce the irrelevance and redundacy of image data.

The procedure aims to improve the visual interpretability of an image by increasing the apparent distinction between the features in the scene.

To obtain useful spatial information from images,including image detection,identification,delineation,enumeration and mensuration.

The measure of finding a similar image through the similarity analysis, consistency coherence and corresponding analysis of the content, characteristic, structure, relationship, texture,gray scale of the image.

See the description of Image Restoration.

The operation aims to correct distored or degraded image data to generate a more faithful representaion of the original situation.

Environments where users can experience non-real situations and/or interact with non-real elements.

Model for finding path of least resistance, most likely the shortest path in the network.