calaculate values in feild calculator ysing python

matu89 — Thu, 16 Jun 2022 15:05:29 GMT

hello , i have 8 points with Z value .

each 2 points is a pair ( see the colors in the image attached).

i created a new feild calles "Delta" that in their i want the result of the difference between a pair..

for example the difference between point 2 to 1 is 4.66 meters..

is there a way to do this via while or for loop ?

thanks for the help!

Re: calaculate values in feild calculator ysing python

JesseWickizer — Mon, 20 Jun 2022 20:27:05 GMT

Using the field calculator with a Python 3 expression, use this formula to populate the records with an even OBJECTID with the Delta between the current and previous Z value.

Expression:

GetDelta(!OBJECTID!, !Z!)

Code Block:

previousZ = 0 def GetDelta(objectId, zValue): global previousZ # Don't calculate Delta for odd numbered OBJECTIDs if (objectId % 2 != 0): previousZ = zValue return None if (previousZ): #Get the absolute value of the difference difference = abs(zValue - previousZ) else: difference = 0 #Update the previousZ global variable with the latest Z value previousZ = zValue return difference

This would have to be run on all records or an even number of records starting with an odd value.

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calaculate values in feild calculator ysing python

Re: calaculate values in feild calculator ysing python