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How to Mark Control Points


Now that you’ve captured your data, it’s time for processing! Marking control points helps to increase the accuracy of your data. Please note that our control points marking tool is currently only available to HPP and premier plan customers. If you’re interested in trying out the marking tool, don’t hesitate to contact us at support@skycatch.com.

If you’re using our Skycatch control points, our software automatically detects your control points and you don’t have to manually mark them. If you’re using non-Skycatch control points, you will have to manually mark them.

Before marking control points in your images, properly format your control points file and upload your control points. You’ll want to be sure that the coordinate system of your control points file matches the coordinate system of your outputs.

After uploading your control points, follow these steps to manually mark your control points:


1. Click Mark GCP or Mark CHP on the first control point you wish to mark.

2. You will be displayed with a set of images that most closely correspond with the control point’s coordinates.

3. Click on an image to get an enlarged view for locating the control point.

4. Here’s a few things you can do when you’re in the enlarged view of an image to identify the control point’s location:

     a. Zoom in and out of the enlarged image by using your mouse scroll wheel.

     b. Click and hold the image to drag your view across different points of

     interest.

     c. Reset the default zoom view

     d. See the number of marked photos of the control point of interest

     e. Browse between photos

     f. Navigate back to the gallery of photos

5. Once you’ve located the control point’s location, place your cursor over the control point and click to mark it.

6. After you place the control point mark on the photo, you can:

     a. Zoom-in on the mark with one click

     b. Remove the mark

7. After zooming in on the mark, you can:

     a. Re-click on the photo to adjust the mark location to the center of the control point. (You should always place your marks in the center of control points for the best accuracy).

     b. After the mark is placed in the center, you can continue to the next photo until the control point has been marked in at least 5 photos.

8. Repeat the marking process so that your control point is marked in at least 5 separate images. Once you’ve done so, you should see a screen similar to the following screenshot. Click the Complete button to move on to the next control point.

9. When you have marked all of your control points:

     a. Make sure that all the non-automated control points have been marked

     b. Confirm control points step is complete

     c. Validate that the correct number of control points has been added to the uploader

     d. When ready, click the green NEXT button to go to the next step

Note: You are required to upload or mark at least 4 GCPs. There is no minimum or maximum number of checkpoints required for upload.

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