Problema con GCP

Al procesar un levantamiento con drone phantom 4 con GCP tomados con la unidad RTK, el error es mayor a 1 metro, por lo que no corrige la cota. el valor de X e Y es correcto. como puedo corregir este problema?

Adjunto el informe del paso 1

I looked at your quality report and it appears you have some issues in how your marked your GCPs. I suggest only marking 10-15 of your best images. Try to select the images where the GCP is more at the center of the image and not at the side. Furthermore, you will want to make sure your projection error is less that 1. To reduce the projection error zoom in as close as you can when marking the GCP. You have four GCPs where the error is above 1. This should help correct your RMS error.