2
votes
3answers
102 views

Iterating using search cursor and layer selection performance?

I'm trying to use the results of a search cursor to iteratively make selections on a feature class and then create new feature classes (so you get a new feature class or shp for each unique value in a ...
5
votes
2answers
136 views

Creating numpy.array with variable number of fields to test arcpy.da.ExtendTable performance?

There was an ArcPy Café blog posting entitled Adding Fields: Performance Tips which advocated: Two approaches to help increase performance when adding numerous fields to a table or feature ...
4
votes
2answers
160 views

How to transfer attributes to thousands of local points from ArcSDE feature class with millions of polygons?

I have a set of points and a huge feature class with topographic information (OS MasterMap for who knows it). I'm talking millions of polygons huge. I want to transfer attributes of the polygons to ...
0
votes
0answers
94 views

ArcMap: Append is really slow

I'm writing a Python script for ArcGIS 9.3.1 which is supposed to do the following: Create a new feature class in local FGDB Loop over a set of IDs (~40,000) Select features from an Oracle GDB with ...
3
votes
1answer
184 views

IO Performance of ArcPy in virtual machine

The following script just copies a file into RAM, performs some simple operations and writes the result back to hard disc: import arcpy import random import time arcpy.management.Delete("in_memory") ...
1
vote
0answers
79 views

Why might ArcPy, TableToTable, MakeQueryTable and ArcSDE have performance issue in IDLE?

I have written a Python script tool to do: Make Query Table Table To Table (with fieldmapping). The code is nothing more than arcpy.MakeQueryTable("table1;table2;table3", ...
8
votes
1answer
163 views

Difference between python window and toolbox

Are there differences in performance or other potentially critical area between running a python script in the python window versus running it from the toolbox in ArcGIS 10.0? I am asking in cases ...
2
votes
1answer
154 views

Clipping buffers to census tracts

I have donut buffers generated to protect anonymity of household locations. They need to be clipped so that they are only inside the census tract that the original point was in. The code takes about 8 ...
5
votes
2answers
836 views

How to improve Python script processing speed (performance)?

I've been working on a script which essentially reads in a large amount of point and polygon data and generates frequency values for a featureclass of 2.5 acre hexes covering California. I have found ...
11
votes
1answer
2k views

Fastest way to count the number of features in a feature class?

With the introduction of the Data Access module in arcpy (30x faster search cursors), I want to know if counting features matching sql criteria is faster than the traditional MakeTableView + GetCount ...