Spatial sampling design using information more than spatial coordinates [SEC=UNCLASSIFIED]

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.Li at 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.Bivand at 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.Bivand at nhh.no]
Sent: Friday, 3 April 2015 2:06 AM
To: Li Jin
Cc: r-sig-geo at 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.Li at 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 ______________________________

--
Roger Bivand
Department of Economics, Norwegian School of Economics, Helleveien 30,
N-5045 Bergen, Norway.
voice: +47 55 95 93 55; fax +47 55 95 91 00
e-mail: Roger.Bivand at nhh.no


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