681 reputation
518
bio website
location England, United Kingdom
age 38
visits member for 3 years, 9 months
seen 2 days ago
I am a GIS Consultant. I love C# and Java type languages and have dabbled in VB a long time ago.

Aug
30
awarded  Popular Question
Jul
22
awarded  Yearling
Jun
6
awarded  Notable Question
Jun
6
revised Quick way to make a convex hull
Update of findings.
Jun
5
comment ListFeatureClasses brings back more than expected
Yep, tried both, same result.
Jun
4
comment ListFeatureClasses brings back more than expected
Doesn't work, tried with just an "*" and "Point", it still brings back all point featureclasses and all grids.
Jun
4
asked ListFeatureClasses brings back more than expected
May
10
comment Quick way to make a convex hull
@whuber - yeh, those are really good ideas - I think the only drawback on this methodology are the actual spatial and attribute selection functions - they take an absolute age!, and I have put a spatial index on the point featureclasses! However this may be due to fact SDE is running on a crappy desktop box, I am now in the middle of transferring the data onto a proper server with the appropriate SDE tuning for vector data. I will feed back when I get a result. PS - I think it may be worth writing this up as an answer then I can award you the points etc.
May
10
comment Quick way to make a convex hull
@whuber - I have put your idea into Python code now and it seems to have worked excellently for a feature class of 11 million points - it cut down the processing to 750K points and the convex hull was perfect. Now doing a 16 million one, but alas no luck yet - I have applied a new spatial index in the hope it will speed things up.
May
10
comment Quick way to make a convex hull
@Hornbydd - I didn't actually know that, but thanks, I will look into that.
May
8
comment Quick way to make a convex hull
@whuber - yep totally agree with your thoughts. Just trying to work out whether your original idea would work...there's definitely something it it :)
May
8
comment Quick way to make a convex hull
@whuber - the performance issue is: looping through ALL the points in the search cursor to put them into an array in order to make a multipoint out of them - that takes a crazy amount of time!
May
8
comment Quick way to make a convex hull
No - using Oracle. That's an option, to use the database side - but I'm just working through Python at the moment.
May
8
comment Quick way to make a convex hull
No - I am creating a convex hull FROM the points, but first you must create a mulitpoint first, then call the convexHull() function.
May
8
asked Quick way to make a convex hull
May
5
accepted ITopologicalOperator and Z Values
May
2
awarded  Popular Question
Oct
31
comment How to migrate an extension from ArcGIS 9.3.1 to 10?
@KirkKuykendall - yep, that microsoft article worked for me too - it was so obvious in the end (NOT!). Thanks, this has been a lifesaver.
Sep
25
awarded  Popular Question
Jul
22
awarded  Yearling