don't forget to make descriptive maps of the species, nests, surrounding
features, land use etc - include scale bars, north arrows (if not obvious)...
Lee De Cola
- Original Message -
From: "Lutfor"
To: r-sig-geo@r-project.org
Sent: Wednesday, February 19, 2014 4:06:22 AM
Subject:
Tiago, if you're not familiar with geographic projections:
1. look at the wikipedia article,
2. check out (from the library) a geography textbook, and
3. try out the examples at the end of the helpfile for spTransform-methods
{rgdal} - add plenty of plot() commands to see what's go
when confronted with a large dataset i usually begin by trying methods out on
subsets, e.g. start with 2^n for n = 8 and work your way up to 2^17... you
might find convergence to the answer to your questions before analyzing the
full dataset.
Lee De Cola
- Original Message -
From: "R
you can find a first cut at presenting BASE and SPATIAL objects at :
http://ldecola.net/programs/R/bestiary.R
i'll be using this in spatial R workshops i conduct and would appreciate
comments!
Lee De Cola.
- Original Message -
From: "Etienne B. Racine"
To: "Lee De Cola"
Cc: r-s
Racine and Rowlingsonâs pages are a nice ways of presenting information. Now
suppose we start with the simplest genus â points, which have 3 species:
matrix {base}
ppp {spatstat}
SpatialPoints {sp}
For an object of one of these classes a student would want to know how to:
1. construct
2
Iâve been teaching and using R (and S-PLUS) for a couple of decades, and
using its spatial libraries for about half of that, but i still get confused by
the various âgeographically-awareâ data objects that are supported.
Although Bivandâs Spatial.html page is quite helpful, I wonder i
so i may quote Prof Rowlingson as stating that
"...coordinate labels, ...a scale bar, north arrow...[are] chart junk"?
Lee De Cola
- Original Message -
From: "Barry Rowlingson"
To: "Marcelino de la Cruz"
Cc: r-sig-geo@r-project.org
Sent: Thursday, December 5, 2013 6:04:27 AM
Subje
here's what i'll do:
mult <- 130
trees <- ppp(
mult * redwoodfull$x, mult * redwoodfull$y,
c(0, mult), c(0, mult),
unitname = c('meter', 'meters')
)
it is unscientific to analyze empirical data in other than the original
geographic units - how else can we speak meaningfully e.g. of 'bandw
my apologies for failing to read the help file...now i wonder who found the
original measurements!
Lee De Cola.
- Original Message -
From: "Marcelino de la Cruz"
To: r-sig-geo@r-project.org
Sent: Wednesday, December 4, 2013 3:01:51 PM
Subject: Re: [R-sig-Geo] original coordinates o
does anyone know the original, true coordinates of the spatstat redwoodfull
data? i can't find them in:
Strauss, D. J. (1975). "A Model for Clustering." Biometrika 62(2): 467-475.
i think reporting spatial data in rescaled units is unscientific.
Lee De Cola, PhD, MCP.
DATA to Insight
lde
don't forget to do this at multiple raster resolutions in order to compute the
box-count dimension!
Lee De Cola, PhD, MCP.
DATA to Insight
ldec...@comcast.net
Reston, Virginia
703 709 6972
571 315 0577 mobile
- Original Message -
From: "Alexandre Villers"
To: "Aide R SIG GEO"
that worked...thanks - i'm giving a workshop next week and will ask
participants to be running the latest version.
Lee De Cola, PhD, MCP.
DATA to Insight
- Original Message -
From: "Sarah Goslee"
To: ldec...@comcast.net
Cc: "r-sig-geo"
Sent: Wednesday, November 27, 2013 1:19:53 PM
i would not think the version would have anything to do with the packages
available on the sites...anyway, here's what's reported at startup:
R version 3.0.1 (2013-05-16) -- "Good Sport"
Copyright (C) 2013 The R Foundation for Statistical Computing
Platform: x86_64-w64-mingw32/x64 (64
i install packages on my windows7 pc by clicking packages > install and then i
select a mirror site, which brings up a list of 100s of packages in alpha
order, including SpatioTemporal followed by spBayes.
Lee De Cola. - Original Message -
From: "Sarah Goslee"
To: ldec...@comcast.net
i don't see it among available packages to install...
Lee De Cola, PhD, MCP.
DATA to Insight
ldec...@comcast.net
Reston, Virginia
703 709 6972
571 315 0577 mobile
[[alternative HTML version deleted]]
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R-sig-Geo mailing list
R-sig-Geo
i'm trying to overlay a grid on a SpatialLines object but over() doesn't work,
even if i load rgeos...
library(sp)
library(rgeos)
# SPATIAL LINES OBJECT
tmp_sl <- SpatialLines(
list(
Lines(
list(
Line(matrix(c(0, 1, 1, 0, 0, 1), 3))
),
ID = 'a'
)
)
)
plot(tmp_sl, axes = T
I'm teaching a GIS data structures using sp and I'd like to give a class on
basic graphs. Does anyone have any experience with the various R packages in
this area - what I have found so far:
diagram Functions for visualising simple graphs (networks), plotting flow
diagrams
GrapheR A multiplat
how can i use the 3 bands from the result of readGDAL('picture.jpg') to render
a color image?
i guess i need to know how RGB2PCT() works.
Lee De Cola, PhD, MCP.
DATA to Insight
ldec...@comcast.net
Reston, Virginia
571 315 0577 mobile
703 709 6972 home & fax
[[alternative HTML v
during the past month i've built a page for my students that has links to other
documents as well as code i've revised to teach sp:
http://ldecola.net/edu/vt/asdar.html
Lee De Cola, PhD, MCP.
DATA to Insight
ldec...@comcast.net
Reston, Virginia
571 315 0577 mobile
703 709 6972 home & fax
Christoph, your question is rather general...specifically WHICH kinds of
graphics did you wish to combine?
Lee De Cola, PhD, MCP.
DATA to Insight
ldec...@comcast.net
Reston, Virginia
571 315 0577 mobile
703 709 6972 home & fax
- Original Message -
From: "Christoph Mülligann"
look at help for prcomp() to find the correct spelling of this technique.
- Original Message -
From: "piero campa"
To: r-sig-...@stat.math.ethz.ch
Sent: Monday, February 14, 2011 10:23:47 AM
Subject: Re: [R-sig-Geo] how to do a principle component analysis with
geo-referenced points
first, i agree with the responses that this isn't a point pattern, but i'm also
concerned about your investigating any kind of process that would apply to such
a HUGE region over such a LONG period of time.
lots of descriptive work should be done first, and most attractively with a
nice-lookin
i'd suggest using table() to generate the frequencies then displaying as a
barplot(..., horiz = T) .
Lee De Cola, PhD, MCP.
DATA to Insight
ldec...@comcast.net
Reston, Virginia
571 315 0577 mobile
703 709 6972 home & fax
- Original Message -
From: "Jaime Burbano Girón"
To: "r
i would think topography and other climatic variables would be at least as
important as spatial statistical factors!
Lee De Cola, PhD, MCP.
DATA to Insight
ldec...@comcast.net
Reston, Virginia
571 315 0577 mobile
703 709 6972 home & fax
- Original Message -
From: "nikos"
To: r
i just use R to compute NORTH in terms of 10^7 meters/degree and EAST as the
same factor multiplied by cos(mean latitude).
you can select the a 'pretty' version of min(LON, LAT) for your (0, 0).
Lee De Cola, PhD, MCP.
DATA to Insight
ldec...@comcast.net
Reston, Virginia
571 315 0577 mobile
i'm teaching a course on geospatial data structures that will in part be using
the sp package.
does anyone know of a tutorial that introduces the fundamentals?
Lee De Cola, PhD, MCP.
DATA to Insight
ldec...@comcast.net
Reston, Virginia
571 315 0577 mobile
703 709 6972 home & fax
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