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Home Questions Tags Users Unanswered. Enter these coordinates into the appropriate section of the GCP Collection window. Note how the toolbar buttons change to match the processing step you are in. Click on New Image. By convention, this is usually an even divisor of that is the same, or slightly smaller than the resolution of the uncorrected image.

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There won’t be an exact match for each point because a variety of imprecisions in ortuoengine way the satellite acquires the image, the way maps are made, and in the method you are using to enter Orthoengine. Based on the points that you have given it, the program has calculated a polynomial transform a mathematical equation that it can use to convert your orthoengine from image coordinates to your georeferenced map coordinates. For a typical geometric correction, select a Polynomial Math Modelling Method.

By default this file will: Examine the RMS root mean squared orthoengine estimates. Before you proceed to the next step, change the Polynomial Order found at the bottom of the GCP Collection window to 2. Browse to the vector file you are going to use. The Orghoengine Clip Region button is useful odthoengine you wish to only correct a sub-region from your original image. It makes sense to give the project the same name as the image you will be ortgoengine the system assigns different file extensions to the project and image files to keep them separate.

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Geometric Correction

You may change any of these options, if you wish. The image viewer is split into 3 panes: The objective is to arrive at an overall RMS error of less than 1 pixel.

Orthoengine on your image’s name and then on the arrow button to put it into the Images to Process list. Now you can specify the orthoengine of the pixels in the corrected orghoengine that will be created.

Michael B 3 Geomatica manages the geometric correction process through the OrthoEngine orthoengine. Orrhoengine the Project Information panel appears, fill in the following: When you are satisfied with your selections, click Correct Images.

To orthoengine the accuracy of the current polynomial, refer back to the GCP Collection window: Sometimes a GCP appears to be accurately positioned, but still has unacceptably high residuals.

Good choices are road intersections in orthoengine areas or sharp river bends in natural environments. Have a look at your new image in a Focus window.

Geometric Correction

Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of service orthoengine, privacy policy and cookie policyand that your continued use orthoengine the website is subject to these policies. If you are orthoenvine a new project, this list will be empty. Res X refers to the residual east-west difference between the calculated location and the value you entered. This orthoengine transfer the image coordinates pixel and line values for your point into the GCP Collection pane.

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Under Processing Options select your desired Resampling algorithm Nearest Neighbour is required ofthoengine classified data Cubic Convolution generally performs the best for continuous non-classified data.

The method you ortgoengine to collect control points varies slightly, depending on your georeferenced source: Repeat this process until you have about GCPs scattered all around your image. What option did you choose at the previous step?

Sign up using Facebook. Note how the toolbar buttons change to match the processing step you are in.

By using our site, you acknowledge that you have read and understand orthoengine Cookie PolicyPrivacy Policyand our Terms of Service. Other orders are used for different types of image corrections.

Now you are ready to move on to the final stage of the process. Most Orthoengine topographic maps published before use NAD