search for: long1

All - I have a large data frame that looks like ID p1 p2 p3...p20 Lat1 Lat2 Lat3...Lat20 Long1 Long2 Long3...Long20 1 0 0 1 0 NA NA 29.xx NA NA NA -89.xx NA 2 1 0 0 1 27.xx NA NA 29.00 -88.00 NA NA -89.xx 3 0 0 0 0 NA NA NA...

...Linux Mandrake 10.1 release: R 2.0.0 editor: GNU Emacs 21.3.2 front-end: ESS 5.2.3 --------------------------------- Colleagues Is there a function to calculate distances between adjacent latitude/ longitude pairs in a matrix? It is basically a spatial diff() function that I have in mind. Data: long1, lat1 long2, lat2 long3, lat3 looking for: diff(data$long, data$lat) function Result long1, lat1 long2, lat2, distance = long/lat2 - long/lat1 long3, lat3, distance = long/lat3 - long/lat2 I've probably missed it but a search of the maillist archives and quick scan of the packages (map*) di...

I am wondering if there is a function which will do a join between 2 data.frames by minimum distance, as it is done in ArcGIS for example. For people who are not familiar with ArcGIS here it is an explanation: Suppose you have a data.frame with x, y, coordinates called track, and a second data frame with different x, y coordinates and some other attributes called classif. The track data.frame has

...leoutput+googlekey ).read doc = Document.new(result.to_s) root = doc.root retstatus = root.elements[''/kml/Response/Status/code''].text if retstatus.to_i == 200 coordinates = root.elements[''/kml/Response/Placemark/Point/coordinates''].text long1, lat1, = coordinates.split('','').map { |v| v.to_f } params[:bookstore][:latitude] = lat1 params[:bookstore][:longitude] = long1 @bookstore = Bookstore.new(params[:bookstore]) if @bookstore.save redirect_to :action => ''add''...

Deemed colleagues I would appreciate your help with a sentence to calculate the linear distance between 2 geographical points (coordinates in UTM). In advance thnks for your attention, -- Ricardo Bandin Llanos rbandin@udec.cl Estudiante - Magíster Cs. m. Pesquerías Universidad de Concepción, Región del Bio-Bio, Chile Celular: (0056-41) 97949957 [[alternative HTML version deleted]]