maps

问题 Respected sir/ma'am I want to implement offline osm map in my project. but i don't found any proper documentation for how to download tiles for offline usage. i am currently using react-native-maps package for implementing custom Tile Overlay import { LocalTile } from 'react-native-maps'; <MapView region={this.state.region} onRegionChange={this.onRegionChange} > <LocalTile /** * The path template of the locally stored tiles. The patterns {x} {y} {z} will be replaced at runtime * For example,

问题 I try to get the current Location with GM API in my application (using Android Studio). But if i click the button which triggers the getLocation() funktion, i always end up in the catch{} block and i dont know why. My mobile device is connected for testing. Here is the getLocation() Funktion: fun getLocation() { var locationManager = getSystemService(LOCATION_SERVICE) as LocationManager? var locationListener = object : LocationListener{ override fun onLocationChanged(location: Location?) {

问题 I am writing a demo web application that tracks multiple devices through my companies platform. I have the app working, but need a csv file that will simulate devices moving on a map as if they were a tracker attached to a car. The simulator works by reading 1 row of data every second (1 lat/lng point). Here is an example of the first few lines of a file that would work if the points weren't scattered across the US (the SclId is the device name). SclId Latitude Longitude HAT-0 44.968046 -94

问题 I have a bunch of latitude/longitude pairs that map to known x/y coordinates on a (geographically distorted) map. Then I have one more latitude/longitude pair. I want to plot it on the map as best is possible. How do I go about doing this? At first I decided to create a system of linear equations for the three nearest lat/long points and compute a transformation from these, but this doesn't work well at all. Since that's a linear system, I can't use more nearby points either. You can't assume

问题 I made this map with highcharter package (for R) which is a highcharts wrapper but there are still 3 bubbleLegend and I only want one of them If anyone can help me, maybe in js? There's even a commit that fixed the issue here in js : https://github.com/highcharts/highcharts/commit/63dc48767b3aa00b846631084b286f6605342e22 library(highcharter) library(dplyr) mydf <- data.frame( lat = c(-7.1871, 36.95733, 17.9356, -20.4379, 30.2496, -54.9593, 18.0365, 17.9688, 18, 18.005, 17.9538), lon = c(129

问题 I made this map with highcharter package (for R) which is a highcharts wrapper but there are still 3 bubbleLegend and I only want one of them If anyone can help me, maybe in js? There's even a commit that fixed the issue here in js : https://github.com/highcharts/highcharts/commit/63dc48767b3aa00b846631084b286f6605342e22 library(highcharter) library(dplyr) mydf <- data.frame( lat = c(-7.1871, 36.95733, 17.9356, -20.4379, 30.2496, -54.9593, 18.0365, 17.9688, 18, 18.005, 17.9538), lon = c(129

问题 i wanted to open a Baidu map with a URL with co-ordinates (latitude/longitude in some form) For normal browsers this is working http://map.baidu.com/?l=13&tn=B_NORMAL_MAP&c=13748138,4889173&s=gibberish thanks to - https://annoyingtechnicaldetails.wordpress.com/2015/01/12/parsing-baidu-map-urls/ But this is not working for mobile browsers. Can anyone with knowledge of baidu map URLs help with making a map URL with co-ordinates with http://map.baidu.com/mobile ? Please help. 回答1: I found the

问题 I want to draw a map of Australia and represent each city as a dot. Then highlight the cities with a high population (>1M) library(sp) library(maps) data(canada.cities) head(canada.cities) I have checked the sp package where this can be done for Canada and some other countries. But Australia details are not there. Is there a special way to get the data for a country we like (name of cities, long, lat, pop)? 回答1: Now you have the data using world.cities , you can plot them a few ways library

问题 I want to draw a map of Australia and represent each city as a dot. Then highlight the cities with a high population (>1M) library(sp) library(maps) data(canada.cities) head(canada.cities) I have checked the sp package where this can be done for Canada and some other countries. But Australia details are not there. Is there a special way to get the data for a country we like (name of cities, long, lat, pop)? 回答1: Now you have the data using world.cities , you can plot them a few ways library

问题 I have implemented this example where I can zoom in to the given coordinates by clicking on the button. First , I want to be able to read coordinates out of a dynamic array, I tried by putting the array in the state but it fails. const ASPECT_RATIO = width / height; const LATITUDE = 37.78825; const LONGITUDE = -122.4324; const LATITUDE_DELTA = 0.0922; const LONGITUDE_DELTA = LATITUDE_DELTA * ASPECT_RATIO; const MARKERS = [ { latitude: 42.637368, longitude: 21.148682, }, { latitude: 42.604021,