Dear Ross, no you missunderstud.
The area of a (square) pixel is computed by a^2 where 'a' is the length
of one pixel side.
In your case a^2 = 100 qkm (and a^2 = 1000 qkm in the second case).
So if you want 'a' from your area's you have to make sqrt(100[km]) and
sqrt(1000[km]), the result is
if your data are latitude/longitude, and you specified them to be so
(i.e., is.projected(object) is TRUE), then distance is in km, else
distance is in the units of the original data coordinates.
(I recognized your output to come from gstat::variogram, but please
mention such details in future
Dear R,
I have a question for conducting a spatio-temporal inquiry, suppose I have
a time series of air temperature data for 100 years for my domain, can I
perform a inquiry like this *How many days are there temperature above 40
degree *(CC) and get all these days, I noticed there are evolving
On 02/25/2013 02:24 PM, ping yang wrote:
Dear R,
I have a question for conducting a spatio-temporal inquiry, suppose I have
a time series of air temperature data for 100 years for my domain, can I
perform a inquiry like this *How many days are there temperature above 40
degree *(CC) and get
Folks:
After about a year of working on this package, I finally got
spatial.tools pushed out to CRAN this weekend. The core function
(?focal.hpc) provides an engine for realizing parallel/cluster
processing of raster files with some features to make the development
of the functions easier for
Folks:
Has anyone figured out a general solution to create a foreach progress
bar, updated as each iteration is completed?
--j
--
Jonathan A. Greenberg, PhD
Assistant Professor
Global Environmental Analysis and Remote Sensing (GEARS) Laboratory
Department of Geography and Geographic
On Mon, Feb 25, 2013 at 2:12 PM, Jonathan Greenberg j...@illinois.edu wrote:
Folks:
Has anyone figured out a general solution to create a foreach progress
bar, updated as each iteration is completed?
--j
The following is what I use frequently, but you should note that the
raster package
Hi,
Two weeks ago I have asked a question regarding the use of R for plotting
lightning density maps. Thanks to you answers I was able to go one step further.
Attached is the .R script and a sample of the data. The script is counting the
number of lightning strikes in hexagons, and then is
How to cast SpatialPolygonsDataFrame (SPDF) to SpatialLinesDataFrame
(SLDF), or vice versa? Alternatively, how best to write a function to
use either an SPDF or an SLDF as a map overlay in levelplot(...)?
Why I ask:
https://bitbucket.org/tlroche/clm_cn_global_to_aqmeii-na
regrids a dataset from
Dear Michela,
I apologize for the late answer. From the help of mahasuhab, section Details:
?mahasuhab
The function ‘mahasuhab’ first computes this mean vector as well
as the variance-covariance matrix of the niche density function,
based on the value of habitat variables in the
Hi all,
Is there a way/package/trick to convert the NAD83 formatted file to
lat lon format?
I downloaded the Major Hydrography dataset from NC,USA to plot
rivers into a NC map. However, the dataset is in NAD83 or in state
plane projection, but i need it to be in lat/lon.
Any help would be
Hi!
Suppose your data set is called nc1.df.
Then you can do:
library(rgdal)
nc1.wgs84 - spTransform(nc1.df,CRS(+proj=longlat +datum=WGS84))
From: r-sig-geo-boun...@r-project.org [r-sig-geo-boun...@r-project.org] on
behalf of Migun Shakya
On 02/25/2013 11:00 PM, Adrian Antonescu wrote:
Hi,
Two weeks ago I have asked a question regarding the use of R for plotting
lightning density maps. Thanks to you answers I was able to go one step further.
Attached is the .R script and a sample of the data. The script is counting the
Tom, say x is your SpatialPolygonsDataFrame, did you try the obvious,
as(x, SpatialLinesDataFrame)
?
On 02/25/2013 11:18 PM, Tom Roche wrote:
How to cast SpatialPolygonsDataFrame (SPDF) to SpatialLinesDataFrame
(SLDF), or vice versa? Alternatively, how best to write a function to
use either
Hi Erin,
I tried that but ended up getting this error. Does the spTransform
function requires the data to be as data.frame?
Here is what i did to read the data
library(maptools)
library(rgdal)
nc.river-readShapeSpatial(~/hydromaj/hydromaj_arc.shp) #reading the
shape file
nc1.wgs84 -
Hi Migun:
Do an str(nc.river)
Is the proj4string string set, please?
Thanks,
Erin
From: Migun Shakya [microbea...@gmail.com]
Sent: Monday, February 25, 2013 7:45 PM
To: Hodgess, Erin
Cc: r-sig-geo@r-project.org
Subject: Re: [R-sig-Geo] converting from
You need an input projection on the data, it doesn't know what you are
transforming FROM.
Did you read this with maptools::readShapePoly? Try with rgdal:readOGR
so you get the projection automatically with the object.
I cannot download the data from the link you provide, but if you post
the text
Try something like this:
proj4string(nc.river) - CRS(+proj=lcc +lat_1=36.16
+lat_2=34.34 +lat_0=33.75 +lon_0=-79 +x_0=609601.22 +y_0=0
+ellps=GRS80 +datum=NAD83 +units=m +no_defs)
From: Migun Shakya [microbea...@gmail.com]
Since you can install rgdal it would be best to go that way (I had
completely missed that you obviously had access to rgdal::spTransform,
please provide the code you are using as asked by the mailing list
guidelines).
library(rgdal)
See ?readOGR
You need a layer name, which can just be the
Hi Mike and Erin,
I added the projection to the shape file as suggested by Erin.
Then i plotted the rivers over and plotted my data points (places
where i collected samples). All my data points look accurate.
Thank you so much.
This was my first try working with GIS data. And, it was fun.
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