We acknowledge the authors of the following works cited in this paper and sincerely appreciate their efforts in making their code publicly available.
[STD] https://github.com/hku-mars/STD.git
[scan context] https://github.com/gisbi-kim/scancontext_tro.git
[itensity scan context] https://github.com/hku-mars/STD.git
[HELIPR dataset] https://github.com/minwoo0611/HeLiPR-File-Player.git