https://fr.mathworks.com/help/map/ref/tissot.html
tissot - Project Tissot indicatrices on axesm-based map - MATLAB
This MATLAB function plots the default Tissot diagram, as described above, on the current axesm-based map and returns handles for the displayed indicatrices.
tissotprojectindicatricesbasedmap
https://fr.mathworks.com/help/map/visualize-spatial-error-using-tissot-indicatrices.html
Visualize Spatial Error Using Tissot Indicatrices - MATLAB & Simulink
A standard method of visualizing map projection distortion is to project small circles spaced at regular intervals across the globe.
visualizespatialerrorusingtissot