3D scanning a Skatepark

I’m planning to 3D scan my local skatepark and manually retopologize it to create a custom map for a skateboarding game.

I’ve tried ro scan it using my iPhone’s Lidar but the result is not good enough, and regular photogrammetry doesn’t work neither because the surface color is too homogeneous and also quite shiny.

I’m wonderig if adding some kind of markers would make a difference, but my options are limited since I don’t want to permanently stain the concrete with chalk getting into the pores.

Any ideas and tips are welcome!