Re: manipulate n insert field values

#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.

On Tue, May 3, 2016 at 3:22 PM, Erik Cederstrand <erik+lists@cederstrand.dk> wrote:

> Den 3. maj 2016 kl. 02.45 skrev Shameema Mohsin <itz.shameema@gmail.com>:
>
>
> Stil stuck with the z order calculation and usage of the property field. Kindly help. I am new to Django, only knows php well.

Where are you stuck? Show your error messages, current non-working code and expected result, or describe your problem in more detail.

I assume you have code to calculate the z order (I have no idea what it is). Otherwise, other forums would be better for help on this. Assuming that, you would do:

def get_z_order(lat, long):
   # Jiggle those numbers
   return z_order


class Employees(models.Model):
   [...]
   @property
   def zval(self):
       return get_z_order(self.empLat, self.empLong)


You can then access zval as if it was a model field.

Erik

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