Open danlooo opened 1 year ago
Hi @danlooo , DGGRID has been updated again and the manual has been updated as well. @sahrk will know better, but I think seqnums are globally stable when the DGGS is instantiated with same parameters, but I am not sure how they are calculated/generated. I think it depends on the internal data structure how cells are created and then its just a linear enumeration.
Thanks a lot for updating DGGRID with new address types for indexing cells! The order of the cells matter a lot when it comes to chunking the data so that geographically nearby cells are stored and compressed in the same chunk. However, I still try to understand how the cells are ordered according to the various indexing methods:
How are SEQNUM values in ISEA actually being calculated? Is there a specific way to iterate over the cells in each icosahedral face? Is SEQNUM like a linear version of PROJTRI?
ZORDER refers to Morton space-filling curves aka, Lebesgue curve, right?
What exactly is Z3? Does it relate to this Z3 index?
SUPERFUND uses hierarchical Central Place Indexing (CPI) as described in (Sahr, 2011; Sahr, 2019). I think this index is well documented in the manual.