#Z value calculation #................................ #step1: converting lat and long to int
latitude int = (latitude + 90) × 10^6 longitude int = (latitude + 180) × 10^6 #note 10^6 = 1000000 We compute the Morton value for a spatial point P (x, y) by interleaving the bits of x and y. For example, when x = 3(011 ) and y = 4(100), the Morton value for P is 100101 = 37 #step2: convert int (base 10) to binary digits (base 2) ..........? #step3: interleave both values bits and compute z value #take first bit from y cordinate (longitude) : 1 #take first bit from x cordinate (lat) : 0 #take 2nd bit from y cordinate (longitude) :0 #take 2nd bit from x cordinate (lat) : 1 #take 3rd bit from y cordinate (longitude) : 0 #take 3rd bit from x cordinate (lat) : 1 therefore z binary value is 100101 and z value is 37 #this is the technique used to convert spatial 2D indexing to 1D to improve efficiency. I do not know the python syntax. Kindly help. -- You received this message because you are subscribed to the Google Groups "Django users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/django-users. To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/11aa86cc-0a4d-41be-b759-9a2ac83099cc%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
