The Reprojection Error can be used to refine ground control point adjustment by eliminating or adjusting image links that have too high of a reprojection error. Once a ground control point has been adjusted, each individual image links within the Image Links Editor will also display a Reprojection Error above the image viewer. Values closer to zero are generally considered to be more accurate to the GCP's original location. These values are the ground control points shift from their initial position after the block adjustment has been run. When you process a project with linked ground control points, each point is provided an accuracy value in meters for x (dX), y (dY), and z (dZ) in the Control Manager window. Remove selected -See Remove control for removing select control points from your project.Not available, that filter will be disabled. To filter by control point type, click the Filter control drop-down list Filter control -Allows you to filter control points by type.Import control -See Import control for importing control points from an external source.Add control from map -See Add control from map for adding control points using a basemap.Image links editor -See Image links editor for linking your control points with your images.Use the Control Manager to access the following: To open the Control Manager, click the Control Manager button on the Home tab. Click Yes to confirm you want to remove the selected control.On the Home tab, click the Control drop-down list.Use the Select tool to select the control points you want to remove.To set the control type using the control tool, complete the following steps: There are two ways to set your control type. The difference between the initial and the computed positions of the checkpoints is displayed in the Processing Report, and it gives an estimation of the absolute accuracy of the model in the region. This way, the relative accuracy in the area of the checkpoints may improve. The image links for the checkpoints are used to estimate the model's 3D position as well as potential errors in the placement of the check points. GCPs improve the relative and the absolute accuracyĬheckpoints (CPs) are used to assess the absolute accuracy of the model. Some of the GCPs can be used as checkpoints to assess the accuracy Project than necessary to accurately scale, rotate, and locate, Ground control points (GCPs) are used to georeference the model. Control typeĭrone2Map allows you to set your control as a Ground Control Point or Check Point. For more accurate adjustments, use a local DEM and ensure it is the top layer in the Elevation Surfaces section when adding ground control points from the map. If there is an offset between output products and the elevation surface, it is likely that the WorldElevation3D/Terrain3D layer was used for adjustment. By default, ground control points added from the map will take the z-values from the topmost elevation surface in the Elevation Surfaces section of the Contents pane.
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