maps

问题 I can plot a UK map with ggmap with a point like this: library(ggmap) UK_map <- get_map(location = c(-2.65, 53.7), zoom = 5, maptype = "hybrid") UK_map <- ggmap(ggmap=UK_map, extent = "device", legend = "right") UK_map + geom_point(data = data.frame(x = -1.81, y = 55.655), aes(x, y), size = 5) However, if I try to use Winston Chang's multiplot function, the point disappears. multiplot <- function(..., plotlist=NULL, cols) { require(grid) # Make a list from the ... arguments and plotlist plots

问题 With iOS 6 the Maps app is dropping Google Maps. The terms of the Google Maps SDK states that if you plot directions with their service you must show it on their map. Since this will no longer be the case I need to explore other options to get directions and display routes on a map. I have found that MapQuest and Nokia each offer an API to provide direction and routing services. MapQuest - http://open.mapquestapi.com/directions/ Nokia - http://api.maps.nokia.com/en/apireference/2.2.0/symbols

问题 I have a ruby on rails application in which in 80% of the pages I am using google maps. So in many of my seperate JS files (in assets/javascripts) I have included many variables from google like google.maps.DirectionsStatus new google.maps.LatLng(a,b) new google.maps.Marker google.maps.event.addListener And I have included the below script in my application.html.erb in head section <script src="https://maps.googleapis.com/maps/api/js?v=3.exp&key=<%= ENV["GOOGLE_MAP"]%>&sensor=false&libraries

问题 How to show only a specific region/area in google map for android api v2?.all functionalities must be available in that region like zooming,dragging etc. the all other areas must be cropped off or invisible. Is that possible??? I am using eclipse.help me please 回答1: To show only specific area or region then you can use Polygons. Polygon objects are similar to Polyline objects in that they consist of a series of coordinates in an ordered sequence. However, instead of being open-ended, polygons

问题 I am just using the code from the following URL with and without API, however the location is not loading on Chrome. The same works fine on IE and Firefox. Can anyone help me understand whats the issue. Please note Location is turned on under the Chrome Settings https://developers.google.com/maps/documentation/javascript/examples/map-geolocation Any help in this regard is appreciated <script> // Note: This example requires that you consent to location sharing when // prompted by your browser.

问题 I write an application that help people find appropriate places and show the direction to the target. Before, this functionality work well but now the draw route function does not work. The exception I got is that application can not download and then parse the kml corresponding to the route ( the code: xmlreader.parse(is); ), although the URL generated to get KML is correct (I test it in Browser) - for example: https://maps.google.com/maps?f=d&hl=en&saddr=21.04664,105.852203&daddr=21.040527

问题 I want to create a world street map using Rstudio. I have this code: countries_map <-map_data("world") world_map<-ggplot() + geom_map(data = countries_map, map = countries_map,aes(x = long, y = lat, map_id = region, group = group), fill = "light blue", color = "black", size = 0.1) the problem: I want to see the names of the countries and to see the map like this one: Thanks for your help! 回答1: We can use the leaflet package. See this link to learn the choice of base map (https://leaflet

问题 I am building a map application with the silverlight bing maps control. In the map control I want to show all of the subscribed customers. The amount of customers is somewhere between 5000 and 7000, this means I can't show them all at once. This would result in a crash I guess. How would you solve this issue? I've read about events on zoomlevels etc. about tile layers about spatial sql but I have no idea what the right solution is in this situation and where to begin. This seems like a pretty

问题 I am developing a web portal with maps that consist of multiple layers, such as cities, rivers, names of various geographical areas and similar. But I have a dilemma regarding how to approach the development of the web portal. I will try to explain the problem briefly. Basic info about the maps: Maps have to be interactive (zoom capability, a pop-up box, ability to change attributes of elements at the click or hover of a mouse...). The maps are in SVG format and must have the ability to

问题 I have just started working with the Google Maps API and Geocoding Service. I followed this tutorial and it was great. Now I want to be able to create a map with a center based on a location ( "Vancvouer, BC" ) as opposed to latitude and longtitude as required when creating the map. What I am trying to do is use a callback function named "initMap()" to initialize the map, and in that function I am creating a Geocoder object to get lang and long based on a location. ( "Vancvouer, BC" ). Here's