[Michelle McLellan]

Hello group,

I am using the "Build network and map linkages" tool from Linkage Mapper 2.0 in ArcMap 10.4. I have successfully run similar analyses in the past with a smaller subset of the data. It was several years ago now but I don't remember it taking this long.

The analysis I am currently running has been at the same point in the process for over 30 hours (see screenshot). I have not done anything else but write this email using this computer, everything is running locally and I have no firewall. I am running it via ArcMap and the project only has the core and resistance layers in it.

I am looking for advice as to whether the time to run this analysis is expected and I should wait it out? 

Or whether it is hung up and I should cancel the process and restart? 

Or whether there is a faster way and I should cancel the process and do it differently?

I have attached the dialog print out for more info. Any advice is appreciated!

Cheers,

Michelle

[John Gallo]

Hi Michelle,

530 cores and 3031 core pairs is a lot.  Depending on the extent of your 100 m resistance raster, and the RAM of your computer, this will indeed take many hours.

You can see if it is hung, I believe, by monitoring the Datapass folder to make sure that new pairwise rasters are being created (it will make up to 3031 of them I think). 

While you are waiting, you can take a look at the manual to see the various options for limiting the number of core-pairs that are analyzed.  For instance, if there is a pair of cores that are many times further away from each other thanthe dispersal distance of your species in question, if you are using a species, then you can set the model to NOT analyze such pairs of such distance.

Note also we have a survey open to determine development priorities: https://www.surveymonkey.com/r/LinkageMapper

Thanks,

John

John Gallo, Ph.D.
Senior Scientist
Conservation Biology Institute
136 SW Washington Avenue, Suite 202
Corvallis, OR 97333
Remote Office: Inglenook, CA

Phone: 707.962.9078
Twitter: @johnagallo

Updates: Action Research Newsletter

--
You received this message because you are subscribed to the Google Groups "Linkage Mapper" group.
To unsubscribe from this group and stop receiving emails from it, send an email to linkage-mappe...@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/linkage-mapper/CAG8d5b6vAJ6wr%2B9cpc-L3FHJW%2BtuXQgOtek%2B%3Dnd5fy1fs5GuGg%40mail.gmail.com.

[mclellan.wild...@gmail.com]

Hi and thank you for responding, I really appreciate the feedback.

In case others are interested in the details:

After three days I cancelled the program and I think it had been hung up based on the time taken for subsequent analyses. 

The resistance raster is (3567x3874). I ended up systematically reducing then number of core areas across the study area to~200 and reducing the number of core pairs allowed for the linkage mapper to complete (4) in about 6.5 hours. 

Thanks

Michelle

[John Gallo]

Hi Michelle and All,

Michelle, great glad it worked out and kudos to you for taking the time to circle back and report your findings!  We should all aspire to follow that lead.

Thanks,

John

John Gallo, Ph.D.
Senior Scientist
Conservation Biology Institute
136 SW Washington Avenue, Suite 202
Corvallis, OR 97333
Remote Office: Inglenook, CA

Phone: 707.962.9078
Twitter: @johnagallo

Updates: Action Research Newsletter

To view this discussion on the web visit https://groups.google.com/d/msgid/linkage-mapper/bece145e-8c8f-4137-8087-51e6227a8b5dn%40googlegroups.com.