Today's Topics:
1. calculating integral for spectral signatures (Enrico Guastaldi)
2. posting on behalf of Kevin, Yen (Roger Bivand)
3. Re: WMS, WFS, WCS an WPS for R (Roger Bivand)
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Message: 1
Date: Sat, 22 Nov 2008 12:59:51 +0100
From: "Enrico Guastaldi" <enrico.guastaldi at gmail.com>
Subject: [R-sig-Geo] calculating integral for spectral signatures
To: r-sig-geo at stat.math.ethz.ch
Message-ID:
<7ce8d7d30811220359n755d2e22k488ca33c10a6d509 at mail.gmail.com>
Content-Type: text/plain
Dear list members,
Does anyone know how to calculate in R integral of bivariate distribution of
discrete points suche as the following
x y
1 1
2 2
3 9
5 11
7 7
12 20
13 10
But I've thousands of x,y points with x always increasing: I'm talking about
spectral signature.
I think I need some function that "constructs" (not interpolates) a polyline
from these x,y points and then calculate the underlying area, because I've
to compare several distributions.
Could anyone help me?
Thanks
--
Enrico Guastaldi
Centro di GeoTecnologie dell'Universit? degli Studi Siena,
Via Vetri Vecchi, 34
52027 - San Giovanni Valdarno (AR)
Italy
Tel. +39 349 4025017
Fax. +39 055 9119439
url: www.geotecnologie.unisi.it
Io uso Linux!
user #466775 counter.li.org
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Message: 2
Date: Sat, 22 Nov 2008 13:42:39 +0100 (CET)
From: Roger Bivand <Roger.Bivand at nhh.no>
Subject: [R-sig-Geo] posting on behalf of Kevin, Yen
To: r-sig-geo at stat.math.ethz.ch
Message-ID: <alpine.LRH.2.00.0811221337310.7189 at reclus.nhh.no>
Content-Type: text/plain; charset="iso-8859-15"; Format="flowed"
I'm posting this on behalf Kevin, Yen - the same text was trapped
yesterday as spam, so this is also a technical issue, and the reason for
helping in this way:
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Hi, lists,
I am reading meterials about GWR, but there are some problems puzzling me
very much:
If there are N observations at N locations g(g1,????gn),the dependent and
independent variables are Y(y1,...yn) and X(x1,...xn). The formula for the
regression is Y=X*Beta, where Beta is the function of location g.
My questions are as follows:
1.How many groups should be grouped for regressing? N groups for the N
locations or M groups (M is a arbitrary number less than N)?
2.When the parameter beta(gi) at location gi is estimated, weight Wi is
used. So how is W used? Are the neighboring k(with in the bandwidth h)
observations used for calculation?
3.Beta is the function of location. Is Beta same as W or expressed as a
function including W like Beta=W*f(g)?
Many thanks and best wishes
Kevin,Yen
LIESMARS,Wuhan University,China
--
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no
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Message: 3
Date: Sat, 22 Nov 2008 14:01:16 +0100 (CET)
From: Roger Bivand <Roger.Bivand at nhh.no>
Subject: Re: [R-sig-Geo] WMS, WFS, WCS an WPS for R
To: Barry Rowlingson <b.rowlingson at lancaster.ac.uk>
Cc: r-sig-geo at stat.math.ethz.ch
Message-ID: <alpine.LRH.2.00.0811221357040.7189 at reclus.nhh.no>
Content-Type: text/plain; charset="iso-8859-15"; Format="flowed"
On Sat, 22 Nov 2008, Barry Rowlingson wrote:
2008/11/22 Hisaji ONO <hi_ono2001 at ybb.ne.jp>:
Hello.
There are lots of services of OGC(Open Geospatial
Consortium:http://www.opengeospatial.org/)'s standard
based Geo-Web ervices incluing WMS(Web Map Service),
WFS(Web Feature Service), WCS(Web Coverage Service) and
WPS(Web Processing Service) all over the world.
Does anyone try to use these services from R?
Any access to WMS and WFS would probably be best done using GDAL and
OGR via the rgdal package.... Let's see...
GDAL has a WMS driver, but it seems you do have to create a 'local
service description' file. www.gdal.org seems down at the moment, so
here's a google cache link:
http://216.239.59.132/search?q=cache:21OOLtr9yj0J:www.gdal.org/frmt_wms.html+gdal+wms&hl=en&ct=clnk&cd=1&gl=uk
For WFS, there's some recent discussion on the gdal-dev list:
http://www.nabble.com/OGR-WFS-driver-td20485363.html
so it might be coming soon. Can you wait?
To do WFS from scratch in R is probably going to need XML parsing,
and then it'll probably also need OGR too unless you want to hand-code
understanding the returned GML...
Yes, so OGR needs to be built against the Xerces libraries. I agree that
WMS and WFS are best handled by using work that is already going on in the
OSGeo community. An example of R in a a WPS setting is:
Katharina Henneb?hl, Edzer Pebesma:
Providing R functionality through the OGC Web Processing Service
given at useR! 2008 in Dortmund in August - there is an abstract on the
conference website. I think that their trial site may be ready before
long, together with the underlying software.
Roger