Hello everybody,
I’d like to use the harmonic mean method just to have a “mean position” of
all my fixes and then estimate the homing movement pattern of my fishes
after I tagged and released them.
Looking to my data, I can see that all the fixes are close to the refuge
used by each individual, so I can consider the HM as the representative
position of fish’ home. Once release, I can calculate distance between fixes
and the “home” so that I can see that 1) fish moves to home because 2)
distance decreases over time until a minimum value, then 3) I can appreciate
how many hour fish spent to reach his home.
None implication or relationship on/with home-range calculation!!
Bye,
Max
-----Messaggio originale-----
From: animov-requ...@faunalia.it
Sent: Friday, January 13, 2012 12:00 PM
To: animov@faunalia.it
Subject: AniMov Digest, Vol 74, Issue 5
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Today's Topics:
1. Re: site fidelity test and harmonic mean (Anne Ghisla)
2. Re: site fidelity test and harmonic mean (Paolo Cavallini)
3. Re: HR analysis, etc. (Roberts, Dan)
4. Re: HR analysis, etc. (Paolo Cavallini)
5. Re: HR analysis, etc. (Giovanni Manghi)
----------------------------------------------------------------------
Message: 1
Date: Thu, 12 Jan 2012 15:46:26 +0100
From: Anne Ghisla <a.ghi...@gmail.com>
To: Animal Movement <animov@faunalia.it>
Subject: Re: [AniMov] site fidelity test and harmonic mean
Message-ID: <20120112154626.718a6c73@galadriel.localdomain>
Content-Type: text/plain; charset="utf-8"
On Mon, 09 Jan 2012 10:34:52 +0000
Giovanni Manghi <giovanni.man...@gmail.com> wrote:
Hi,
On Thu, 2012-01-05 at 02:22 -0800, Maximiliano wrote:
> Hi,
> does anybody know if there?s an application of Qgis to perform SITE
> FIDELITY TEST, like in arcview3?
> I?d like to know if I calculate the harmonic mean of all my fixes
> and the distance of each fixes from this ?home range? centre?
> thanks a lot!!
don't think there is something ready for QGIS, but it would be a nice
addon for the Home Range or for the triangulation plugin. Any interest
in supporting its development?
Hello Maximiliano, Giovanni,
the literature on harmonic mean is quite old: the method dates back to
1980 and the Animal Movements documentation [0] warns about the known
problems in home range estimates.
I won't implement this specific method in HomeRange plugin, as I don't
support the idea of implementing a method that has such known biases.
Also, as HR plugin is a interface to adehabitat, I would ask Cl?ment
Calenge his opinion about adding this method to adehabitat directly.
As an alternative to harmonic means, to individuate the core centres of
the home range, I suggest to calculate homeranges with kernel method and
select the 90% isopleth. (90% is a common value to identify core areas.
However, better run an incremental core area analysis [1] to identify
the correct limit of the core area for each animal). Then, calculate the
center of each core area polygon and use it instead of the harmonic
mean.
This is my suggestion, of course comments and improvements are welcome!
[0]
http://alaska.usgs.gov/science/biology/spatial/gistools/animal_mvmt.php#harm_mean
[1] http://wiki.faunalia.it/dokuwiki/doku.php/public/animove_howto#analyses
Best regards,
Anne
--
http://gis.cri.fmach.it/ghisla/
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Message: 2
Date: Thu, 12 Jan 2012 15:46:28 +0100
From: Paolo Cavallini <cavall...@faunalia.it>
To: animov@faunalia.it
Subject: Re: [AniMov] site fidelity test and harmonic mean
Message-ID: <4f0ef244.3060...@faunalia.it>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Il 12/01/2012 15:46, Anne Ghisla ha scritto:
I won't implement this specific method in HomeRange plugin, as I don't
support the idea of implementing a method that has such known biases.
Agreed fully. HM is rubbish.
All the best.
--
Paolo Cavallini - Faunalia
www.faunalia.eu
Full contact details at www.faunalia.eu/pc
------------------------------
Message: 3
Date: Thu, 12 Jan 2012 11:20:45 -0500
From: "Roberts, Dan" <dan.robe...@myfwc.com>
To: "cavall...@faunalia.it" <cavall...@faunalia.it>, Animal Movement
<animov@faunalia.it>
Subject: Re: [AniMov] HR analysis, etc.
Message-ID:
<d679ab09bfe3074c8d3961b08b99f965297bf13...@fwc-tlex10.fwc.state.fl.us>
Content-Type: text/plain; charset="us-ascii"
I have been using ARCGIS, Spatial Analyst, and Hawthes Tools to analyze fish
movements in rivers and estuaries. We have been using various home range
analyses to characterize habitat. I no longer have access to ARGIS. Can
you point me to resources for beginners using ANIMOVE, etc.? Thanks in
advance for any suggestions.
Waterinterface
------------------------------
Message: 4
Date: Thu, 12 Jan 2012 17:35:40 +0100
From: Paolo Cavallini <cavall...@faunalia.it>
To: "Roberts, Dan" <dan.robe...@myfwc.com>
Cc: Animal Movement <animov@faunalia.it>
Subject: Re: [AniMov] HR analysis, etc.
Message-ID: <4f0f0bdc.9080...@faunalia.it>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Il 12/01/2012 17:20, Roberts, Dan ha scritto:
I have been using ARCGIS, Spatial Analyst, and Hawthes Tools to analyze
fish movements in rivers and estuaries. We have been using various home
range analyses to characterize habitat. I no longer have access to ARGIS.
Can you point me to resources for beginners using ANIMOVE, etc.? Thanks in
advance for any suggestions.
Waterinterface
http://www.faunalia.it/animove
https://trac.faunalia.it/animove/wiki/AnimoveHowto
All the best.
--
Paolo Cavallini - Faunalia
www.faunalia.eu
Full contact details at www.faunalia.eu/pc
------------------------------
Message: 5
Date: Thu, 12 Jan 2012 18:28:12 +0000
From: Giovanni Manghi <giovanni.man...@gmail.com>
To: Animal Movement <animov@faunalia.it>
Subject: Re: [AniMov] HR analysis, etc.
Message-ID: <1326392892.2238.16.camel@sibirica>
Content-Type: text/plain; charset="UTF-8"
Hi Robert,
all the steps to put the HR plugin, R and QGIS work together are
described in this screencast and wiki page
http://ubuntuone.com/p/zon/
http://hub.qgis.org/wiki/quantum-gis/HomeRange_plugin
cheers
-- Giovanni --
On Thu, 2012-01-12 at 11:20 -0500, Roberts, Dan wrote:
I have been using ARCGIS, Spatial Analyst, and Hawthes Tools to analyze
fish movements in rivers and estuaries. We have been using various home
range analyses to characterize habitat. I no longer have access to ARGIS.
Can you point me to resources for beginners using ANIMOVE, etc.? Thanks in
advance for any suggestions.
Waterinterface
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