In this lecture, we introduce the term resampling, which is the process of determining actual pixel values in an image to place onto a map grid using mapping polynomials. We'll delve into how we use control points to find unknown coefficients, apply these polynomials to identify points in the image, and how to handle cases when these points do not fall exactly on a pixel grid center.
Key Topics Covered:
• Mapping Polynomials: Using control points to find coefficients.
• Image-to-Map Correspondence: Relocating pixels onto correct positions
on the map grid.
Resampling Methods:
• Nearest Neighbor Resampling: Choosing the nearest recorded pixel when grid spacings match.
• Bilinear Interpolation: Linear interpolations over four surrounding pixels to estimate brightness.
• Cubic Convolution Resampling: Using cubic polynomials for smoother image correction.
• Geometric Correction and Co-Registration: Using mapping polynomials for removing geometric distortions and co-registering multiple images.
• Geocoding/Geo-referencing: Registering images to map coordinates (latitudes and longitudes).
We'll explore the practical aspects of these techniques and their applications, especially focusing on the importance of ground control points. Be sure to consider the questions at the end to prepare for our next lecture.
Introduction to Remote Sensing (Theoretical Lecture)
Part 1 | A Comprehensive Guide to Remote Sensing Image Acquisition, Analysis, and Real-World Applications
• A Comprehensive Guide ...
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Part 2 | Understanding Earth's Atmosphere: A Key to Remote Sensing 🛰️
• 🌍 Understanding Earth'...
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Part 3 |Types of Platforms for Imaging the Earth’s Surface
• Introduction to Remote...
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Part 4 | How do we record images of the Earth's surface
• Introduction to Remote...
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Part 5 | What are we trying to Measure in the Earth's Surface
• What are we trying to ...
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Part 6 | Distortions in Recorded Satellite Images | Part 6
• Introduction to Remote...
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Part 7 | Geometric Distortions in Recorded Images
• Introduction to Remote...
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Part 8 | Correcting Geometric Distortion in the Image
• Introduction to Remote...
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Part - 9 | Correcting Geometric Distortion using Mapping Functions and Control Points
• Correcting Geometric D...
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Part 10 | Introduction to Resampling Techniques
• Introduction to Remote...
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