From the course: Drone Analysis with Drone2Map and ArcGIS Online

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What is a true ortho?

What is a true ortho?

From the course: Drone Analysis with Drone2Map and ArcGIS Online

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What is a true ortho?

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- [Instructor] Esri documents that there are different kinds of products you can create from your drone imagery in Drone2Map. In this video session, we are going to focus on the creation of a true ortho, or sometimes called a true ortho mosaic. Now, when you fly your drone imagery and collect the Earth approximately vertical to the ground, the results are always full of distortion. For example, in this image here, let me click on this one. All right, great. We have an image that is at Nadar in the center, basically directly overhead the center. But as we go to the sides, it's almost like the buildings are tilted away from our camera. If we zoom here to North Hall, we can see the stonework around North Hall, but we see the sides of the building, right, as if they're tilted away from us. This concept is really called a central projection, and it's the idea from a camera view. Now, ortho rectification can help correct this geometric reality to basically situate the buildings so that…

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