topic Re: statistical calculation using moving wondows with different sizes in ArcGIS Spatial Analyst Questions

statistical calculation using moving wondows with different sizes

PengGao3 — Fri, 10 Apr 2015 17:04:52 GMT

I have a raster distributed rainfall data for a local
watershed. I want to use moving window of different sizes to calculate the mean
of precipitation within the window and find out the highest mean among all
windows of the same size.

Thanks.

Peng

Re: statistical calculation using moving wondows with different sizes

DarrenWiens2 — Fri, 10 Apr 2015 17:46:30 GMT

Have you tried Focal Statistics?

Re: statistical calculation using moving wondows with different sizes

PengGao3 — Fri, 10 Apr 2015 17:53:42 GMT

Not yet, but I just found that this might work. So, I will try it.

Thanks a lot.

peng

Re: statistical calculation using moving wondows with different sizes

PengGao3 — Sat, 11 Apr 2015 03:05:21 GMT

?yes, it worked -- thank you !

peng

Re: statistical calculation using moving wondows with different sizes

SepheFox — Sat, 11 Apr 2015 03:51:05 GMT

Hey Peng, It's customary to mark an answer as correct if it worked for you. Thanks!

Re: statistical calculation using moving wondows with different sizes

PengGao3 — Sat, 11 Apr 2015 03:55:40 GMT

Thanks for letting me know.

Just did it.

Peng

Re: statistical calculation using moving wondows with different sizes

DanPatterson_Retired — Sat, 11 Apr 2015 07:22:11 GMT

To be complete, one should realize that there are at least two types of statistical groupings when working with raster data...those that work with overlapping neighborhoods and those that work with adjacent neighborhoods

...focal vs block statistics. Both have their place. Details of both are documented in their respective help topics

How block statistics works the neighborhood 'jumps' by its size and shape to the right (then down)

...How focal statistics works the neighborhood 'moves' the neighborhood shape one cell to the right (then down)

Then don't forget there is Line Statistics and Point Statistics ... so the choice really depends upon the neighborhood type, shape and configuration and how you want to implement the movement.

Re: statistical calculation using moving wondows with different sizes

PengGao3 — Sat, 11 Apr 2015 14:35:59 GMT

This is an important point to make. Your explanation is very thorough -- thanks. For my analysis, I need overlay effect, which means I need to use 'Focal Statistics'.