The "clhs" package (http://cran.r-project.org/web/packages/clhs/) has
some functionality for latin-hypercube sampling hence it is suitable for
your case. Here are some code examples:
http://gsif.isric.org/doku.php?id=wiki:tutorial_eberg#testing_the_feature_space_coverage
I have also recently (experimentally) implemented a function to test
'efficiency of any sampling plan' which looks at both geographical space
and feature space representation:
http://gsif.r-forge.r-project.org/spsample.prob.html
If you discover a bug or some 'strange behavior', please let me know.
HTH,
T. (Tom) Hengl
Researcher @ ISRIC - World Soil Information
Team member Africa Soil Information Services http://africasoils.net
Url: http://www.wageningenur.nl/en/Persons/dr.-T-Tom-Hengl.htm
Network: http://profiles.google.com/tom.hengl
Publications: http://scholar.google.com/citations?user=2oYU7S8AAAAJ
On 8-4-2015 2:24, jin...@ga.gov.au wrote:
Sorry for not ccing to the list!
-----Original Message-----
From: Li Jin
Sent: Tuesday, 7 April 2015 9:36 AM
To: 'roger.biv...@nhh.no'
Subject: RE: [R-sig-Geo] Spatial sampling design using information more than
spatial coordinates [SEC=UNCLASSIFIED]
Thanks a lot, Roger! Yes, we have looked at spsurvey and it does not meet the
needs of our client.
Kind regards,
Jin
-----Original Message-----
From: Roger Bivand [mailto:roger.biv...@nhh.no]
Sent: Friday, 3 April 2015 2:06 AM
To: Li Jin
Cc: r-sig-geo@r-project.org
Subject: Re: [R-sig-Geo] Spatial sampling design using information more than
spatial coordinates [SEC=UNCLASSIFIED]
On Thu, 2 Apr 2015, jin...@ga.gov.au wrote:
Hi All,
I need to consider both spatial information and another variable (e.g.
elevation, soil type) in a sampling design. It seems the available
libraries (e.g. sp and spcosa) in R for spatial sampling design are
unable to handle it. Please correct me if I am wrong. Before I start
to develop my own function for it, I would like to confirm if I have
missed some other functions that are available for it in R. Any
suggestions and advice? Thanks in advance!
Have you looked at spsurvey? It may not provide what you need, but checking it
would probably help you see whether there is anything meeting your needs.
Otherwise you might need to stratify first on your covariates.
Roger
Regards,
Jin
Jin Li, PhD
Spatial Modeller/Computational Statistician | National Earth and
Marine Observations Group Environmental Geoscience Division |
GEOSCIENCE AUSTRALIA
____________________________________________________________
Phone: +61 2 6249 9899 Fax: +61 2 6249 9999
Email: jin...@ga.gov.au<mailto:jin...@ga.gov.au> Web:
www.ga.gov.au<http://www.ga.gov.au/>
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Bergen, Norway.
voice: +47 55 95 93 55; fax +47 55 95 91 00
e-mail: roger.biv...@nhh.no
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