The following normative documents contain provisions that, through reference in this text, constitute provisions of this document. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. For undated references, the latest edition of the normative document referred to applies.
ISO/OGC: [ISO 19111:2019] Geographic information — Referencing by coordinates. 2019 (February 8, 2019).
ISO/OGC: OGC SF [99-036/ISO 19125]: Geographic information - Simple feature access - Part 1: Common architecture. 2005. .
ISO/OGC WKT CRS [12-063r5/ISO 19162:2019]: Geographic information — Well known text representation of coordinate reference systems. 2019 (August 8, 2019)
"Octree". https://en.wikipedia.org/wiki/Octree. Not Published (N.P.), 2016. Web. 20 Oct. 2016.
“Quadtree”. https://en.wikipedia.org/wiki/Quadtree. N.P. 2017. Web. 20 Jan. 2017
“R-Trees”. https://en.wikipedia.org/wiki/R-tree. N.P. 2017. Web. 20 Jan. 2017