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Chapter: Civil : Remote Sensing Techniques and GIS : Image Interpretation And Analysis

Important Questions Answers - Image Interpretation And Analysis

Civil - Remote Sensing Techniques and GIS - Image Interpretation And Analysis



1.What is image interpretation?


Image interpretation is defined as the extraction of qualitative and quantitative information in the form of a map, about the shape, location, structure, function, quality, condition, relationship of and between objects, etc. by using human knowledge or experience.


2. What are all the Types of image interpretation?


Photo interpretation photographic interpretation and image interpretation are the terms used to interpret the Visual Image Interpretation.


3. What is Visual Image interpretation?


Visual Image interpretation is the act of examining photographs/images for the purpose of identifying objects and judging their significance'

4. What is Photo interpretation?


Photo interpretation is defined as the process of identifying objects or conditions in aerial photographs and determining their meaning or significance.


4.What is image reading?


Image reading is an elemental form of image interpretation. It corresponds to simple identification of objects using such elements as shape, size, pattern, tone, texture, color, shadow and other associated relationships. Image reading is usually implemented with interpretation keys with respect to each object .


5.What is image measurement?


Image measurement is the extraction of physical quantities, such as length, location, height, density, temperature and so on, by using reference data or calibration data deductively or inductively.

6. What is image analysis?


Image analysis is the understanding of the relationship between interpreted information and the actual status or phenomenon, and to evaluate the situation. 7. What is thematic map?


Extracted information will be finally represented in a map form called an interpretation map or a thematic map.


8. What are the Image interpretation elements ?


The eight elements of image interpretation are shape, size, tone, shadows, texture, site, pattern and association.


9. What is Digital Image Processing?


Digital Image Processing is a collection of techniques for the manipulation of digital images by computers. The raw data received from the imaging sensors on the satellite platforms contains flaws and deficiencies. To overcome these flaws and deficiencies in order to get the originality of the data, it needs to undergo several steps of processing. This will vary from image to image depending on the type of image format, initial condition of the image and the information of interest and the composition of the image scene.


10. What are the general steps of image processing? The three steps of image processing are ,




        Display and enhancement


        Information extraction


11.Write about pre processing?


In the preprocessing ,prepare data for subsequent analysis that attempts to correct or compensate for systematic errors.


12. What is Image Enhancement?


The operations are carried out to improve the interpretability of the image by increasing apparent contrast among various features in the scene. The enhancement techniques depend upon two factors mainly l The digital data (i.e. with spectral bands and resolution)


14. Write the objectives of interpretation?


The objectives of interpretation as an image enhancement technique often drastically alters the original numeric data, it is normally used only for visual (manual) interpretation and not for further numeric analysis. Common enhancements include image reduction, image rectification, image magnification, transect extraction, contrast adjustments, band ratioing, spatial filtering, Fourier transformations, principal component analysis and texture transformation.

15.What is digital image?

Digital Image is the matrix of 'Digital Numbers'. A digital mage is composed of thousands of pixels. Each pixel represents the brightness of small region on the

earth surface.Digital Image processing involves the manipulation and interpretation of digital image with the aid of computer.


16.What is filtering?


Filtering means the smoothening of an image using different Masks or Kernels.\

17.What is spatial filtering?

' Spatial Filtering can be described as selectively emphasizing or suppressing information at different spatial scales over an image. '


Spatial operation consists in changing the values of each pixels according to the values of the pixels in the neighborhoods.


18.What is convolution?


A convolution is an integral which expresses the amount of overlap of one function g as it is shifted over another function f. '


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