replace james and robson

source/using.rst

@@ -124,18 +124,12 @@ Bowling effect on point cloud over 13,000+ image dataset collected by World Bank
 
 To mitigate this effect, there are a few options but the simplest are as follows: fly two patterns separated by 20°, and rather than having a nadir (straight down pointing) camera, use one that points forward by 5°.
 
-.. figure:: images/flight_lines_20deg.png
-   :alt: figure showing camera flight line
-   :align: center
-
-From James and Robson (2014), `CC BY 4.0 <https://creativecommons.org/licenses/by/4.0/>`_
+.. figure:: images/flightplanning.gif
+  :alt: animation showing optimum
+  :align: center
 
 As this approach to flying can be take longer than typical flights, a pilot or team can fly a small area using the above approach. OpenDroneMap will generate a calibration file called cameras.json that then can be imported to be used to calibrate another flight that is more efficiently but, from a self calibration perspective, less accurately.
 
-  .. figure:: images/flightplanning.gif
-    :alt: animation showing optimum
-    :align: center
-
 Vertically separated flight lines also improve accuracy, but less so than a camera that is forward facing by 5°.
 
 .. figure:: images/forward_facing.png