similar to: Precision on Latitude/Longitude

Dear R-helpers, I get GPS readings with bug counts (bugs meaning insects in this case) made along rows in crop fields and use these to make maps of bug distribution. The GPS readings are not quite accurate enough for my purpose, so since I know what row each reading is made in, I adjust the latitudinal coordinate using: grd<-lm(lat~lon+Row,data)

Good day to you all, I have lightning data containing date, time, latitude and longitude. I hope that distribution of latitude and longitude will give number of lightning occurrence in a region. I have used factor function to sum up the number of events on latitude and longitude axis and saved as x and y. But when I tried to plot the two, I had and error message ( Error in image.default(x, y, z) :

Hi, i''m trying to use the GeoKit plugin to calculate the distance between 2 points. So the idea is, i do a search for an article, and the results i want to order by distance. So i have a form where I enter the article (that im looking for) and my address. Then rails must find all articles that match with my query and order by address. So now, i have two models: Article and User. Articles

Dear all, I have been trying to convert coordinates from longitude/latitude to utm but I got an error. As soon as the longitude coordinate is greater than 90, I get the folloowing error message: "error in pj_transform: latitude or longitude exceeded limits" Here is what I did: SP<-SpatialPoints(cbind(126.59,-14.30),proj4string=CRS("+proj=longlat"))

Hi Team, Need your guidance in building SPDF objects from Latitude, Longitude Information available. I am using package "plotGoogleMaps" which is really awesome but it requires SPDF objects to build the maps. I have a data frame which have Latitude and Longitude information and wanted to convert it in SPDF for making maps. Please help me to find suitable package or function to convert

Hi All, I have a data frame with three columns i.e., pc, lat, lon. The pc column is populated with list of postcodes, and I want to execute R command that can get me the lat and lon for the every item in the pc column and populate the respective lat and lon columns. Is there any package that could be used? Any help will be really appreciated. Many Thanks and Kind Regards -- Muhammad

hi, i have a longitude vector (x) a latitude vector (y) and a matrix of bathymetry (z) with the dimensions (x,y). I have already succeeded in plotting it with the image.plot (package 'field') and the contour functions. But now, I want to make a grid in order to extract easily the bathymetry corresponding to a couple of longitude, latitude coordinates. Do you know a function or a

Hi all, I would like to know a way of calculating the distance between 2 points when I already have the longitude and latitude of the points. For example : Point 1 : 52? 9'54.00"N 4?25'8.40"E Point 2 : 52?27'46.80"N 4?33'18.00"E Distance between point 1 and point in km .... Is there any functions already available for this ? Any help will be much

Hello.. I am playing around on a pilot project with this wonderful Rails plugin.... thanks for sharing it w us ! I read in a post , in reply to this subject yjat : Events are possible. Either through the @map.record_init "azeazeae" (for arbitrary events like domlistener) or through the @map.event_init(@map,:click,"function(){alert(''HOYOYO'');}"). The

Do you have a preferred programming pattern for adding functionality to an ActiveRecord? As an example, say I have some gnarly trig functions for distance and bearing between pairs of latitude and longitude: === file: latlng.rb module LatLng def haversine_distance(lat1, lng1, lat2, lng2) ... end def bearing(lat1, lng1, lat2, lng2) ... end === EOF ... and I want to mix in

Does anyone have any experience retrieving latitutde and longitude for an address from the Google Maps API? I'd like to have an R script that submits a street address, city, state, and zip code and returns the coordinates. So far, I've been submitting the coordinates from another program, then loading the coordinates in R and merging them back into the data frame I want to use.

Hello everybody, I''m working with Version 3 of Google Maps JavaScript API, and I have the next code: In a layout of my application: <script type="text/javascript" src="http://ajax.googleapis.com/ajax/ libs/jquery/1.4.1/jquery.min.js"></script> <script type="text/javascript" src="http://maps.google.com/maps/api/js?

I have a dataset showing points, with a category for each point and its location. I simply want to display my points, in a way that users can toggle the points on and off by category. Where I have two objects in the same category I'd like to display them nudged to appear as two distinct, but very close points. I have made reproduceable example (the places are not real), which is loosely

Objective: Determine if a set of x and y-latitude points are inside of a polygon using R. Lets say I have 9 polygons. Where I have labeled the polygons to be checked from 1-9. The problem I?m running into is running the point.in.polygon to check if those points are in one of several polygons, as my code overwrites the result. To accomplish this I am using the R-built in function called

I am trying to set up a Grass project and need to set up the region so that I can view the map. I can look at a map and find the lat/lon, but the map projection is in UTM NAD38 WGS84 and I need to set the eastings and northings. Is there a package that will help me calculate this in R. thanks -- Stephen Sefick Let's not spend our time and resources thinking about things that are so little

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.

I have a dataset giving traffic between pairs of ports, and the lat/lon of each port, roughly as follows: sample data as follows > df2VisitTrips[1:4,] Origin Destination NumberOfTrips OriginLatitude OriginLongitude DestinationLatitude DestinationLongitude 1 P1 P16 1 39.45965 -80.15633 40.76111 -79.54583 2 P1 P3

Used a great howto @ http://iamrice.org/articles/2005/12/09/using-google-maps-in-the-uk-with-rails for using google maps on uk sites. Just having one issue I can''t seem to work out how to draw the postcode from my table I keep getting hit by method errors. The controller is require ''postcode_2_latlong'' postcode = Postcode.new("TN22 2LG") # I want this to

Hi all, I''m trying to use the excellent GeoKit plugin to geocode addresses entered by users. I use GeoKit to get latitude and longitude values, then plot these using Google Maps. The problem I have is that the maps produced tend to be slightly off where they should be. Nearby addresses seem to be grouped to one point, which suggests that the problem is in rounding the lat and lng values

Hello, This is probably very simple but I am trying to select a region from the OIv2 SST dataset that crosses 0 longitude. The longitude variable is arranged from 0 to 360 and I get an error message when trying to go from 330 to 30 for example. The data are from a NOAA netCDF file. *temp = open.ncdf("c:/documents and settings/theoni/desktop/sstoi_v2.nc") print(temp) y1 = get.var.ncdf(