Hi,
I am curious if spgwr or some other spatial packages estimate local
variances. I am particularly interested if gwr residuals are locally
siginificant or not. In this case, I believe I should estimate local
variances. I though an alternative to spgwr is gam in mgcv.
Suppose I have xy coor
Hi,
I am reading sp and trellis manuals, but how can I change a bar scale? I
am looking for something like zlim=c()
Thank you!
tk
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I figured it out. Thanks for taking a look. thanks
Takatsugu Kobayashi wrote:
> Hi, I must apologize both for this lengthy thread and for posting a
> thread based on the same example I have been using.
>
> I successfully created a code that re-arrange 10*10 grid cells of the
>
Hi, I must apologize both for this lengthy thread and for posting a
thread based on the same example I have been using.
I successfully created a code that re-arrange 10*10 grid cells of the
same size into new grid cells of varying sizes. Now I am attempting to
create grid cells of the same si
hi,
I have read a couple of threads about png and jpg not being supported in
R CMD BATCH. So I decided to use bitmap() instead. I would like to
repeat printing jobs 1000 times. I only got empty png files. Doesn't
this loop open bitmap, plot, close bitmap everytime?
rm(list=ls(all=T))
### Incl
I figured out by reading vignette('sp') and a PBSmapping manual. Thanks.
Takatsugu Kobayashi wrote:
> Hi,
>
> I created a grid of cells of varying sizes using makeGrid() in sp. I
> could calculated the areas of these cells of varying sizes using
> calcArea() and combin
Hi,
I am trying to show grid cells with colors. Colors depends on the number
of points falling within grid cells. Here is what I did;
rm(list=ls(all=T))
library(sp)
library(maptools)
library(PBSmapping)
### Define parameters for a grid
start.point <- -5
cco <- c(start.point,start.point)
csize
Hi,
I created a grid of cells of varying sizes using makeGrid() in sp. I
could calculated the areas of these cells of varying sizes using
calcArea() and combinePolys() in PBSmapping. I wonder if there is a
function with which to compute the perimeter length. Or should I convert
polygons to pol
Also, look at this thread:
https://stat.ethz.ch/pipermail/r-sig-geo/2005-July/000502.html
Debarchana Ghosh wrote:
> Hi,
>
> After reading a ESRI shape file I want to create a neighbor list (class nb)
> from the polygon list by defining a distance thresholds for example 2500m.
> This is a option i
?dnearneigh in spdep package is the one I can think of.
Taka
Debarchana Ghosh wrote:
> Hi,
>
> After reading a ESRI shape file I want to create a neighbor list (class nb)
> from the polygon list by defining a distance thresholds for example 2500m.
> This is a option in GeoDa weights creation. How
Hi,
(As an exercise)I am trying to create a SpatialPolygons object from n*n
grid. By reading the material (from vignette{'sp'), I managed to convert
grid to polygons. Now I would like plot this polygons, and here is what
I have done so far:
Step1: Create a 9*9 grid
n<-9 # number of cells in ea
Hi,
I am trying to install rgdal package on my local directory in my school
server. I uploaded gdal-1.5.0, built and compiled it on my local directory.
After ./configure I got:
GDAL is now configured for x86_64-unknown-linux-gnu
Installation directory:/usr/local
C compiler:
Hi
Please forgive me if I am asking a simple question.
I would like to add values in a column vector to readShapePoly() object
and show a map based on these values using spplot() or addPoly().
Basically, my raw data are employment census data with the coordinates
(X,Y).
tmp1 <- read.csv("tmp1
/GIS on R. I am basically reading [R], [R-Geo], and R
News...
Thank you very much.
Takatsugu Kobayashi
PhD student
Indiana University Bloomignton
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; T. +44(0)1865 318842
> F. +44(0)1865 311383
> [EMAIL PROTECTED]
> www.earthwatch.org
>
>
> On Thu, 13 Sep 2007, Takatsugu Kobayashi wrote:
>
>
>> Hi,
>>
>> I would like to know if there are packages to compute shortest network
>> path distances, some
Hi,
I would like to know if there are packages to compute shortest network
path distances, something that can be down on TransCAD and ArcGIS
network analyst. I have cencus tract centroids and network line
shapefiles for 126 US urbanized areas. Basically, I would like to move
the census tract c
Hi
I wonder if there are nice books for spatial analysis in R, in addition
to reading R news, Journal of Computers and Geosciences, and Gnu
manuals, etc. Eventually I would like to be capable of doing research
using R-spatial packages and R-GRASS. My PC platform is RHEL Client 5.
ArcGis is still s
ct structure...
Sorry for this R-geo newbie question
Thank you very much while you must be busy at AAG.
Best regards,
Taka
Roger Bivand wrote:
> On Fri, 20 Apr 2007, Takatsugu Kobayashi wrote:
>
>
>> Hi,
>>
>> I has a meteorology project in which I have to map
Hi,
I has a meteorology project in which I have to map average wind speeds
over EU, as well as European countries' boundary. I have been looking
online for free European maps like the one I can find on US Census for
N. America. But it seems like google doesn't hit anything useful. I
wonder if
R users:
This is more of a general question.
I am trying to conduct hypothesis testing about the difference of two
angles extending from the same point. I am reading directional
statistics by Mardia, but it seems to talk about only frequency
distribution on the circumference drawn by the unit
Hi
I am trying to create a list of nearest neighbors using knearneigh and
dinearneigh. To understand these I have been coding what these functions do:
For example, for dnearneigh, suppose I have x-y coordinates and the
corresponding z values
# calculate distances between observations
data<-cbi
Hi,
I have been doing exploratory analysis of the link between global
Moran's I coefficients and directional biases of frequencies.
I created a 10*10 matrix that contains random numbers using
randomNumbers(). This went well till I had to define a list of nearest
neighbor of each cell. I define
Rusers:
I am trying to compute a Moran's I coefficient for census tracts for
Indianapolis in R. I have a shapefile for Indianapolis and uploaded it
into R. I understand how to compute a Moran's I coefficient using knn2nb
command. How can I compute a Moran's I based on a edge/border contiguity
Hi,
I wonder if anyone know whether there is a R package for implementing a
geographically weighted negative binomial regression model.
Or is it possible to do this model by using a mgcv package with a family
= negative.binomial?
I am not sure how to determine the adaptive bandwidth in a gam
pa
Dear Dr. Bivand:
I do have both datasets. I will try interp() for an irregularly spaced data.
On Fri, 25 Aug 2006 [EMAIL PROTECTED] wrote:
> Dear R users-
>
>
> I have a dataset that has X, Y and other values (Zs) attached to points
> (X,Y). To show a map of this dataset, a matrix of Zs shou
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