topic Dynamic segmentation + Arcpy in Python Questions

Dynamic segmentation + Arcpy

ChukwuemekaEzeiruaku — Tue, 05 May 2015 21:29:17 GMT

Item ID	Begin	End	TestDate	Construction
1000	0	1	1998	2000
1001	0	5	2001	2000
1002	1	4	1998	2000
1003	4	5	1998	2000
1004	3	5	2005	2000

Requirments include:-

- I would like to segment the dataset to eliminate records with older TestDate to Construction date

- Output table should be non overlapping (begin/end)

Should look like below:-

Item ID	Begin	End	TestDate	Construction
1001	0	3	2001	2000
1004	3	5	2005	2000
1002	5	7	1999	1998

Thanks

Re: Dynamic segmentation + Arcpy

JaiSiva1 — Fri, 10 Dec 2021 22:57:02 GMT

Hi Chukwuemeka,

If these are the attributes of a feature class , the following code might help :

import arcpy
fc = "c:/data/base.gdb/construct"
fields = ('TestDate', 'Construction')
with arcpy.da.UpdateCursor(fc, fields) as cursor:
    for row in cursor:
       if row[0] < row[1]:
          cursor.deleteRow ()

Hope you would find this useful.

Re: Dynamic segmentation + Arcpy

ChukwuemekaEzeiruaku — Thu, 07 May 2015 14:54:43 GMT

Thanks so much for the code, i was able to get that part done.

Is there a way either with python scripts or other solution to segment the following table to get the result below?

Input table (not a feature class)

Item ID	Begin	End	TestDate
1000	0	1	1998
1001	0	5	2001
1002	1	7	1999
1003	4	5	1998
1004	3	5	2005

Each segmented section (from-to) should have all the item numbers written to a field that is within a certain range. From the input table, the final table should look like the one below:

Output table

Begin	End	TestDate	Item ID	Item ID
0	1	1998	1000	1001
1	3	2001	1001	1001; 1002
3	4	1999	1002	1001; 1002; 1004
4	5	1998	1003	1001; 1002; 1003; 1004
5	7	2005	1004	1002

Again Thanks.

Re: Dynamic segmentation + Arcpy

JaiSiva1 — Fri, 08 May 2015 05:31:21 GMT

Hi Chukwuemeka,

From the comparing the input table and output table , it is hard for me to find a condition using which the output table is generated.

If you can explain the condition & logic involved in detail , it will be helpful.

Re: Dynamic segmentation + Arcpy

BlakeTerhune — Fri, 08 May 2015 13:10:44 GMT

This appears to be a duplicate post. The other thread has more responses.

Dynamic segmentation with respect to a control factor