geojson | 易学教程

Plotting Points on a Map with d3.js

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For this project, I have a map of India in d3, with seperation by province. I'm trying to add points onto the map, but it just isn't working for me. The nodes are supposed to become bigger and smaller based on the amount of complaints that is specified in the csv file. Here is my code: visualize.html <!DOCTYPE html> <html lang="en"> <head>  <title>India Map</title>  <script type="text/javascript" src="d3.min.js"></script> <script type="text/javascript" src="d3.geo.min.js"></script> <style type="text/css"> svg { background: #fff; } #india { fill: #95a5a6;

Bangalore geojson map with d3 js

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Am trying to use a Bangalore geojson file with 8 zones (features) in it by using d3.js The map is not showing up properly. What's wrong here. ?? <!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>D3: expr maps</title> <script type="text/javascript" src="d3/d3.min.js"></script> <style type="text/css"> /* No style rules here yet */ </style> </head> <body> <script type="text/javascript"> //Width and height var width = 500; var height = 300; var vis = d3.select("body").append("svg") .attr("width", width).attr("height", height); d3.json("BangZone.json", function(json) { // Create

d3 line and points on map from csv data

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I am trying to plot individual data points and also a line path that runs between these points like this example D3 stop and restart transition along path to allow click through to geo data coordinates that I have been helped with before. Now I want to use my actual data rather than a test set of coordinates but am running into trouble. I have tried both a geoJson file and also csv for my data. I am using a csv file with lon and lat for the points and was hoping to make the line from that same set of data, ie use one set of data for the points and line. I can’t get my line to show up in the

Chloropleth map with geojson and ggplot2

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I am trying to map Human Poverty Index for various districts of Nepal with choropleth map in R using geojson and ggplot2. I read geojson data for Nepal with districts from here . I saw some examples here , here . This is what I did: # Read geojson data for nepal with districts library(tidyverse) library(geojsonio) #> #> Attaching package: 'geojsonio' #> The following object is masked from 'package:base': #> #> pretty spdf <- geojson_read("nepal-districts.geojson", what = "sp") ##https://github.com/mesaugat/geoJSON-Nepal/blob/master/nepal-districts.geojson #tidy data for ggplot2 library(broom)

GeoJson and D3.js multipolygon

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I have this geometric shape file, so no map of a city. I store it in a GIS database as GeoJson. Now, I want to visualize the geojson data. I created the GeoJson data first with QGIS and exported it as Coordinate Reference System WGS 84 EPSG:4326 . This is an example data of Shapefile one: { "type":"FeatureCollection", "crs":{ "type":"name", "properties":{ "name":"urn:ogc:def:crs:OGC:1.3:CRS84" } }, "features":[ { "type":"Feature", "properties":{ "Membership":0.000000, "Membership_1":0.000000, "Membership_2":0.000000, "Membership_3":0.000000, "Membership_4":0.000000, "Membership_5":0.000000,

Put markers to a map generated with topoJSON and d3.js

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I am creating a map of a particular state, I have been experimenting with d3.js and topojson and have created a great map, but now I want to add a marker on the map. But now I have problems because as I add the marker have a GeoJSON file to add markers to the map generated and also the power I'd like to open a tooltip whenever a marker is pressed. My map is very similar to this: http://bl.ocks.org/mbostock/4699541 and all I want is to add markers to states through a GeoJSON file that has the geographical coordinates of the markers. So the map is currently Map expected... You can add somthing

leaflet js: draw POIs as canvas

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问题 I want to draw many geo points with Leaflet. Therefore I want to use HTML5 canvas to improve the performance. My datasoure is geoJSON. As I saw in the documention of Leaflet, it is not possible to draw the geo positions as canvas yet. var anotherGeojsonLayer = new L.GeoJSON(coorsField, { pointToLayer: function (latlng){ return new L.Marker(latlng, { icon: new BaseballIcon() }); } }); I think I should hook up here: pointToLayer: function (latlng) { } Does somebody know how to draw my latlng

D3.js - how to add zoom button with the default wheelmouse zoom behavior

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问题 So I got a worldmap with mouse zoom using the default d3.behavior.zoom() and limits to prevent the map from being dragged completely out of the page. This was a pain to get working, but it now work. My problem now is that this project also require useless zoom + and - button in the interface and I can't found example featuring both type of zoom. It's either mouse zoom only or a crappy zoom by button only. I tried simply calling zoom.scale(newScale); but it don't update anything. I seem to be

Problems converting from shape to topojson

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问题 I'm trying to convert a shapefile of mexican municipalities into a topojson and displaying it using d3.js using this tutorial http://bost.ocks.org/mike/map/#converting-data. I've managed to convert it but I can't manage to display it. Any help will be greatly appreciated. This is my workflow so far: 1) Download and unzip the shapefile wget http://mapserver.inegi.org.mx/MGN/mgm2010v5_0a.zip unzip mgm2010v5_0a.zip 2) Converting to JSON, reprojecting to lat-long and subsetting the shapefile

how to get lat long from google map when our own geojson layer is there?

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问题 google.maps.event.addListener(map, 'click', function( event ){ alert( "Latitude: "+event.latLng.lat()+" "+", longitude:"+event.latLng.lng() ); }); this code gives us lat long when we click on google map. but it does not work when there is our own geojson layer that is if we have our own geojson layer of polygon over google map then clicking inside that polygon the above code would not work 回答1: Either add your click event listener to the Data layer or set the Data layer to not accept mouse