Question
The operations aim to correct distorted and degraded image data to create a more faithful representation of the original Earth features during disaster is known as:
The correct answer is
Image preprocessing
Defining Image Preprocessing Operations
The process of correcting distorted and degraded image data to achieve a more accurate representation of original Earth features, especially during disasters, is termed Image preprocessing. This stage is crucial for enhancing image quality and preparing the data for subsequent analysis.
Understanding Image Preprocessing
- Goal: To fix errors and improve the quality of raw image data.
- Application: Essential for tasks like disaster assessment where clear imagery is vital.
- Function: It involves techniques to remove noise, correct geometric distortions, and adjust radiometric values, leading to a more faithful representation of the Earth's surface.
Analyzing Incorrect Options
- Image distortion: This refers to the inaccuracies or alterations present in an image, which preprocessing aims to correct. It is the problem, not the solution.
- Image classification: This is the process of categorizing pixels or objects within an image into predefined classes (e.g., identifying water bodies, urban areas). It typically follows preprocessing.
- Image fusion: This involves combining information from multiple images (e.g., different spectral bands or sensors) into a single, more informative image. It is a different technique from correcting degradation in a single image.
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Important Questions from Remote Sensing
- Which of the following are major applications of Remote Sensing and GIS in disaster management ?
A. Real time flood monitoring
B. Hazard Zonation mapping
C. Post disaster damage assessment
D. Earthquake prediction with precise timing
Choose the correct answer from the options given below : - List-I with List-II:
List-I
(Types of resolution)List-II
(Description)A. Spatial Resolution I. Number of independent channels B. Temporal Resolution II. Sensitivity of the detectors C. Spectral Resolution III. Frequency of measurement D. Radiometric Resolution IV. Smaller spatial measurement
Choose the correct answer from the options given below : Among the following sensors, which are the most efficient for detecting forest fire ?
A. Optical Sensor
B. Thermal Infrared Sensor
C. Microwave Sensor
D. Smoke Detector Sensor
E. Ultrasonic Sensor
Choose the correct answer from the options given below :
- Match List - I with List - II.
List - I Resolution List - II Capabilities A. Spatial Resolution I. Narrowness of the spectral bands B. Spectral Resolution II. Variations in brightness C. Radiometric Resolution III. Revist capability D. Temporal Resolution IV. Size of the pixel
Choose the correct answer from the options given below : - Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): A variety of Remote Sensing methods can be used to detect, monitor and respond to natural disaster as well as to assess disaster vulnerability.
Reason (R): Tonal values are important because they often form distinct image patterns that may be of great significance in image interpretation.
In the light of the above statements, choose the most appropriate answer from the options given below:
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