Hi Shen - The state-of-the-art spatiotemporal database systems are based on topological embedding and geometric interval computation (hyper-rectangle cell&#x2F;simplicial complex <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Simplicial_complex" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Simplicial_complex</a>).<p>And while I don&#x27;t know of any open-source systems based on this design, SpaceCurve is publicly available  (<a href="http:&#x2F;&#x2F;www.spacecurve.com" rel="nofollow">http:&#x2F;&#x2F;www.spacecurve.com</a> <a href="http:&#x2F;&#x2F;www.jandrewrogers.com&#x2F;2015&#x2F;10&#x2F;08&#x2F;spacecurve&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.jandrewrogers.com&#x2F;2015&#x2F;10&#x2F;08&#x2F;spacecurve&#x2F;</a>) , and I&#x27;ve heard systems like this exist within IBM and Google.<p>Have you looked into this approach?