We design and propose a method that can be used to evaluate the quality of glacier velocity maps. The method is composed of two numbers that we can calculate for every velocity map. Based on statistics and ice flow physics, velocity maps with numbers close to the recommended values are considered to have good quality. We release an open-sourced software tool called GLAFT to help users assess their velocity maps. GLAFT is available by local installation and cloud access with executable documentation and demos, suitable for research and educational purposes.