What is the different between orthorectification and rectification?

As a remote sensing practisioner, once should know the main difference between orthorectification and rectification process.

Airborne / satellite Image Rectification involve the process of correcting the x and y coordinate of the distorted image. It does not consider the terrain relief displacement of the image. Common technique that can be used are by using ground control point, map-to-image rectification, and image-to-image rectification.

For orthorectification, it involve the process of correcting the x, y, and z coordinate of the distorted image. It will consider the  terrain relief displacement. Generally, digital elevation model (Dem) is used as the reference to correct the image. However, ground control point that has height information ( x, y, z) can also be used.

That it for today. I try my best to share as much knowledge as i know. And do correct me if i am wrong. Thanks you.

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Posted on April 16, 2013, in Remote Sensing & GIS and tagged , , , , , , , . Bookmark the permalink. Leave a comment.

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