points sampling

Question

Hi everyone,

I have 35,000 points datasets. It is tedious to incorporate all points for my analysis. I am trying to generate random sample points in ArcGIS 9.3.1 platform. Is it possible run sampling technique in ArcGIS 9.3.1?

Thanks!

SteveLynch · Answer

or you can read the post (05-19-2011 02:13 PM) in this thread

Steve

Eric6346 · Answer

You can also use Python's random number generator to get random subsets.

Let's say you have 100 points in your feature class, and you want a subset of 70 random points.  Make a new Short Integer field in the feature class, then use Calculate Field.  Make sure you change from VB to Python, and use this code:
arcgis.rand("Integer 1 100")

Then sort the Attribute table by the random number, and select the first 70 records.

TarunJaiswal · Answer

I dont have Geoestatistical analyst and I want to make a random selection over points. I need help urgently!!!

You can always get a 60 day trial version of Geostatistical Analyst.