Re: How is 50% MCP calculated?

[GIS in Ecology]

Hi Morgan,

In order to be able to help you with this, can you provide more information about the package you used to generate your 50% MCP (i.e. rhr), such as a link it its webpage. Ths is because I'm not familiar with it, and need this information to find out more about it, and how it works.

All the best,

Colin

On Friday, September 7, 2018 at 11:09:52 AM UTC+1, Morgan Piczak wrote:

How is the 50% MCP estimated? The 50% most concentrated points? I do not think it is based off a centroid. I cannot seem to find this anywhere. I am thinking it is the 50% closest points relative to each other. I've attached the 100 and 50% mcp I estimated using rhr.

[James Grecian]

Hi Morgan,

The 100% MCP is the minimum convex polygon that will surround 100% of the points, so I would imagine the 50% MCP is simply the smallest shape that will surround 50% of your points.

Best,

James

On 3 Sep 2018, at 15:44, Morgan Piczak <morgan...@gmail.com> wrote:

How is the 50% MCP estimated? The 50% most concentrated points? I do not think it is based off a centroid. I cannot seem to find this anywhere. I am thinking it is the 50% closest points relative to each other. I've attached the 100 and 50% mcp I estimated using rhr.

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<Pop MCP.png>

[Chavoux Luyt]

Hi Colin,

Signer & Balkenhol 2015 gives a description of hrh and the reasons behind it, if this will help. https://onlinelibrary.wiley.com/doi/abs/10.1002/wsb.539

Regards,

Chavoux

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[Peevee See]

Hello,

I am reading this thread now (2020) since i need to figure out Home Ranges for 15 different Golden Eagles in ArcGIS. I have 2 different tools installed in ArcMap 10.6.1 (HRT2.0, ArcMET and Home Range Extn Toolbox). With HRT 2. 0 I made progress and was able to get a KDE for 5000 points highly autocorrelated dataset with a 50% isopleth configuration. But, MCP isn't working at all in this tool along with the Remove X/Y Duplicates which the author (Dr. Rodgers) adviced me to first try before running MCP. Both don't work. So I switched to ArcGIS HR toolbox and it created the percentiles but I see nothing represented in the map ( there is no manual) and i am not sure why i can't see the percent contours for the exact same dataset I tried with HRT. So now i am wondering if rHr is a better option(??) Can anyone give me some guidance here?

thank you

Prabha Venu

[Alex Nguepkap]

Hi Peevee See. 

I had the same difficulties using Arcgis to calculate MCP. Finally I used Qgis, extension "Animove" and it worked perfectly. 

regards. 

Le ven. 2 oct. 2020 à 11:02, Peevee See <prabha...@gmail.com> a écrit :

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Alex Nguepkap      GIS Officer     Wildlife Conservation Society (WCS)     Cameroon Program     Tel: (+237) 676 163 774 / 698 610 926     E: angu...@wcs.org     S: christianlemegne     Web: http://cameroon.wcs.org

[Jodi Whittier]

You might consider using R. R tends to process spatial files faster the ArcGIS and there are more options for calculating MCP.

https://www.r-bloggers.com/2016/04/home-range-estimation-mcp/

https://jamesepaterson.github.io/jamespatersonblog/03_trackingworkshop_homeranges

https://www.rdocumentation.org/packages/adehabitatHR/versions/0.4.18/topics/mcp

https://rdrr.io/rforge/rhr/man/rhrMCP.html

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[Chavoux Luyt]

Hi Prabha,

rHr will work. However, it is a plugin to R, which means that you will need to know a little bit of R (at least enough to know how to import .shp files), import your data (from ArcGIS or qGIS) into R, ran rHr in R and then export your results back into a .shp file that you can open in qGIS (or ArcGIS) for your final maps. For me it was worthwhile, since it does make your results more reproducible and makes it easier to compare results across studies and areas. YMMV

Good luck!

Regards,

Chavoux

[Prabha Venu]

Thank you for the recommendation. Unfortunately, I couldn't run rHr since the link doesn't work anymore. I did succeed in using HRT 2.0 and the Home Range toolbox for ArcGIS. Both work and it is imperative that the correct field choices are made, smoothing parameter/bandwidth/Search Radius, Extent and Cell Size. It did not work before since my choices for these were incorrect. I also realized MCP=Minimum Bounding Geometry (MBG) in ArcGIS so that solves the problem of MCP not working since i just used MBG instead.

thanks

Prabha

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[Jodi Whittier]

As Chavoux indicated, R does help provide reproducible results and is also a great way to remind yourself of the steps you used if you have to come back to this at a later time. If you are somewhat familiar with R, I can share some code for importing spatial files which might save you some time. Chavoux may have some coding too.

Best,

Jodi

Chavoux

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