Question

Identify the CORRECT statement(s).

• A. External geometric errors in satellite images can be corrected using GCPs and an appropriate mathematical model.
• B. During rectification, transformation coefficients are used to rectify remote sensing images to a standard datum and map projection.
• C. Spatial interpolation models take care of four kinds of distortions in the remote sensing images.
• D. Registration is done between a satellite image and field data.

Hint:

When rectifying satellite images, always use GCPs and transformation coefficients to align the image to a standard datum.

Answer 1

The Correct Option is A, B

- Option (A) is correct because external geometric errors (such as errors due to the satellite's position or orientation) can indeed be corrected using Ground Control Points (GCPs) and a mathematical model that relates the image coordinates to real-world coordinates.
- Option (B) is correct because, during the process of image rectification, transformation coefficients are applied to correct the image’s spatial alignment with a known standard datum and map projection.
- Option (C) is incorrect because spatial interpolation models typically handle missing data or resampling and are not specifically used to correct distortions in remote sensing images.
- Option (D) is incorrect because image registration is usually done between a satellite image and another reference image, not just field data. Step 1: Conclusion
The correct statements are (A) and (B).