search for: coordinates

Displaying 20 results from an estimated 4047 matches for "coordinates".

2006 Feb 09
1
converting lat-long coordinates to Albers Conical Equal Area coordinates
..., county, township, census-tract, and zipcode level R maps with an Albers Conical Equal Area projection. We would like to be able to plot the location of weather stations or other point locations on the maps. The data the point locations are in latitude-longitude units and we must convert the coordinates to the Albers Conical Equal Area coordinates. However, as of yet, we have not been able to obtain satisfactory results using mapproj. Given the specs below can someone please tell us how to use mapproj (or some other R library) to convert lat-long coordinates into the appropriate Albers Conical...
2009 Jun 17
2
Difference beetwen element in the same column
Hi, i have this file pressure,k,eps,zeta,f,velocity:0,velocity:1,velocity:2,vtkValidPointMask,Point Coordinates:0,Point Coordinates:1,Point Coordinates:2,vtkOriginalIndices 0.150545,0.000575811,0.0231277,0.000339049,-0.0193008,0.00318629,-6.24066e-07,5.39599e-05,^A,7,0,0,0 0.150546,0.000782719,0.0226157,0.000497957,-0.0192084,0.00367781,5.09813e-06,5.90689e-05,^A,7,0.0003035,0.000225,1 0.056182,0.00501745,0....
2008 Aug 22
2
Coordinate systems for geostatistics in R
...to use? I have my data in a geographic coordinate system, WGS84, decimal degrees....is this the wrong format for such analyses? I have also converted my data in the UTM projection and so have it in metres....(ranging from 480,000 to 550,000 E and 170,000 to 230,000 N). If I was to use the UTM coordinates, should I be using the actual coordinates in metres, or should I convert this into an arbitrary coordinate system (i.e. from 0 - 1) somehow? I have noticed that running an analysis on the data gives different results depending on which type of system you use, so I want to make sure I have the co...
2012 Oct 10
3
Generating random geographical coordinates
Dear all, I have two coordinates vectors, say X and Y of length n. I want to generate for each couple of coordinates X1,Y1 X2,Y2 X3,Y3....Xn,Yn a random coordinate which is located in a square define as X +/- dx and Y +/- dy. I saw the runif function which can generate for just one value at a time what I want : runif(1, X - dx...
2008 Aug 19
4
converting coordinates from utm to longitude / latitude
Hi, is there a function in R to convert data read with read.shape and which is originally in UTM coordinates into longitude / latitude coordinates? I found the convUL() function from the PBSmapping package but I have no idea how I could apply that to the read.shape object. Many thanks, Werner __________________________________________________ Do sragenden Schutz gegen Massenmails. http://mail.yahoo....
2017 Jun 25
2
Writing my 3D plot function
Hi all,I had a question last week on asking for a function that will help me draw three different circles on x,y,z axis based on polar coordinates (Each X,Y,Z circle are coming from three independent measurements of 1-360 polar coordinates). It turned out that there ?is no such function in R and thus I am trying to write my own piece of code that hopefully I will be able to share. I have spent some time to write some code based on the rgl lib...
2008 Feb 29
2
How to convert the "user coordinate system" in R graph to "normal coordinate system" whose origin is the upper-left cornner of the drawing area?
Dear friends, The user coordiante system in the R graphics is easy to understand as it simply corresponds to the range of values on the axes of the plot. However, sometimes, we want to kown the coordinates of a region in other system, e.g., the normal coordinate system whose origin is the the upper-left cornner of the drawing area which is used to set the hot regions in the HTML image maps. Is there any suggestion? For example, I execute the code, > png("x.png", width = 480, heig...
2011 Oct 12
1
getting data associated with coordinates in a spatial data frame
If I know the specific coordinate in a spatial data frame, how can I access the data at that coordinate? My coordinates are labeled "x" and "y" in a data.frame "e". The data is in column "leachate". I want to say, basically: e$leachate@coordinates(2,3<mailto:e$leachate@coordinates(2,3>). Thanks, Daniel [[alternative HTML version deleted]]
2010 Jan 26
1
sp package coordinates and gridded problems with as.list()
Dear All I hope that someone can help. I am working with sp pakage and akima library("akima") library(sp) imagine lots of different dataframes, of row = 100 columns = 3 of x and y coordinates with z values I will call these data frames for the sake of this example akima akima<-as.list(1:100) producing 100 dataframes dataframes of the form akima[[i]] I then wish to interp this list of coordinates: akima.li<-as.list(1:100) for (i in 1:100) akima.li[[i]]<-interp(akima[[i]]$x,...
2017 Jun 22
2
Help: ifelse selection for x,y coordinates
Hi everyone, My database has 3 columns?: the x coordinates, the y coordinates and the value of G for every individual (20 in total). I would like to have the x,y coordinates of individuals, Under these conditions?: the distance to the reference coordinates must be under or equal to 50 meters + the value of G must be bigger or equal to 16. Here?s what I?ve...
2008 Jun 01
1
transforming output of grid.locator() to coordinates of a leaf viewport
Short form: How do I transform the output of grid.locator() (or grid.locator(unit='npc')) to the native (or npc) coordinates of a viewport other than the top-level viewport? Thanks in advance. -Ben Long form: I would like the user to be able to click anywhere on the R graphics window. I would then like to figure out which leaf viewport the user clicked in and compute the native coordinates in that leaf viewport of...
2010 Aug 18
3
mtext coordinates
Un texte encapsul? et encod? dans un jeu de caract?res inconnu a ?t? nettoy?... Nom : non disponible URL : <https://stat.ethz.ch/pipermail/r-help/attachments/20100818/5f203714/attachment.pl>
2005 Jun 22
2
Contour Plots
Hello all. I'm confused a bit about contour plots. After reading the help at "?contour", it seems as though the contour plot is for 3D plots (x,y, and z). My data is in the form of grid coordinates (x,y), and I want to see a contour plot of the data so that I can tell where most observations lie. My question is simple but still evasive. Say my data is called places. One column is X and another is Y. Or, places$X places$Y Coordinate 1 32...
2012 Aug 09
1
How to find data in a map according to coordinates?
Hello, I have created a spatial map of temperature over an area thanks to interpolation. So I have temperature data everywhere on my map. My question is: how can I find temperature data on my map for a specific location according to coordinates? For this, I have a data frame containing 4 columns: "x" for longitude, "y" for latitude, "z" for altitude" and "temperature" for my data, for each pixel of my map. My real data has more than 9 million of rows (because I have a temperature data for each...
2008 Nov 05
1
Applying a loop with rnorm() to eliminate duplicate coordinates in a dataframe object
Dear colleagues I found duplicate coordinates trying to convert a dataframe object (see the attached file) into a geodata one ('geoR' package is needed). My dataframe object consists of 2 columns with UTM geographical coordinates and a 3rd column with fish densities . To overcome the handicap I must add a tiny value generated by rnorm...
2010 Jun 07
2
Polar coordinate
...itude. For a particular location, the magnitude of the parameter varies with time. I wish to obtain a polar coordinate distribution of time (0-24h) and magnitudes so as to visualize how magnitude varies with different times of the day (e.g., morning, midnight hours). I have searched for "polar coordinates in R" but could not get helpful hints. I would be most grateful if anyone could advise me on where to start. Thank you. Ogbos [[alternative HTML version deleted]]
2017 Jun 25
0
Writing my 3D plot function
...stEtiquette -- Sent from my phone. Please excuse my brevity. On June 25, 2017 2:42:26 PM EDT, Alaios via R-help <r-help at r-project.org> wrote: >Hi all,I had a question last week on asking for a function that will >help me draw three different circles on x,y,z axis based on polar >coordinates (Each X,Y,Z circle are coming from three independent >measurements of 1-360 polar coordinates). It turned out that there ?is >no such function in R and thus I am trying to write my own piece of >code that hopefully I will be able to share. I have spent some time to >write some code base...
2007 Dec 18
9
Scatterplot Showing All Points
Hello all, I'm trying to graph a scatterplot of a large (5,000 x,y coordinates) of data with the caveat that many of the data points overlap with each other (share the same x AND y coordinates). In using the usual "plot" command, > plot(education, xlab="etc", ylab="etc") it seems that the overlap of points is not shown in the graph. Name...
2016 Dec 06
0
Panic: file dsync-mailbox-tree-sync.c: line 576 (node_mailbox_trees_cmp): assertion failed: (ret != 0)
Hi, Here is a crash that's happening using the latest Dovecot version (v2.2.27 on CentOS7 x86_64): We are using replication. Judging by the second server's logs, I believe this has something to do with the fact that we're using the lazy_expunge plugin. Every night after midnight, we purge the lazy_expunge namespace by running a command similar to following one on the main server
2012 Oct 08
1
3d polar coordinates in rgl function view3d()
Dear all: I'm enjoying using rgl and I want to set a specific viewpoint. I understand that view3d() will do so by setting the 3d polar coordinate angles, theta and phi. In standard polar coordinates, theta is the angle away from the X axis in the X-Y plane and phi (inclination angle) is the angle between the Z axis and the radius vector It appears that when you use view3d() theta is defined as the angle away from the x axis in the X-Z plane and phi is the angle between the Y axis and the rad...