Re: [R-sig-Geo] NDVI time-series filter

2010-02-03 Thread Jonathan Thayn
, January 29, 2010 5:02 PM To: r-sig-geo@stat.math.ethz.ch Subject: [R-sig-Geo] NDVI time-series filter I need to smooth a collection of annual NDVI time-series data for a fairly large image. Right now I am using an interruptive method that compares the difference between each point

Re: [R-sig-Geo] NDVI time-series filter

2010-01-30 Thread Tomislav Hengl
, January 29, 2010 5:02 PM To: r-sig-geo@stat.math.ethz.ch Subject: [R-sig-Geo] NDVI time-series filter I need to smooth a collection of annual NDVI time-series data for a fairly large image. Right now I am using an interruptive method that compares the difference between each point

[R-sig-Geo] NDVI time-series filter

2010-01-29 Thread Jonathan Thayn
I need to smooth a collection of annual NDVI time-series data for a fairly large image. Right now I am using an interruptive method that compares the difference between each point and the mean of its two neighbors. This process repeats until a threshold is reached. It works well, but it takes a