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Here api won't draw on map using Geojson, can't read property geojson of undefined


Here api won't draw on map using Geojson, can't read property geojson of undefined

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Here api won't draw on map using Geojson, can't read property geojson of undefined
Tag : javascript , By : sgmichelsen
Date : November 28 2020, 12:01 PM

it helps some times If you are going to use HERE Map API Version 3.1, please see below quick start tutorial.
https://developer.here.com/documentation/maps/topics/quick-start.html
var platform = new H.service.Platform({
  'apikey': 'API-KEY'
});
 defaultLayers.normal.map -> defaultLayers.vector.normal.map
  center: {
      lng: 102,
      lat: 50
   },

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Is it possible to read geoJSON or topoJSON file in R to draw a choropleth map?


Tag : r , By : noboruwatanabe
Date : March 29 2020, 07:55 AM
wish helps you topoJSON and geoJSON files are know very common for drawing maps on the internet. Is it possible to import them in R to draw choropleth maps? , Get the rgdal package installed. Then if:
library(rgdal)
> "GeoJSON" %in% ogrDrivers()$name
[1] TRUE
> map = readOGR("foo.json", "OGRGeoJSON")
> plot(map)

Leaflet : setting icon for GeoJSON layer from GeoJSON property


Tag : javascript , By : user178372
Date : November 21 2020, 09:01 AM
this will help What happens here is that your passing a string not the icon instance. If you want to use a string to access javascript object properties you'll need to use bracket notation to access properties in a certain scope. If it's in global scope you could use: window[feature.properties.iconcategory] or this[feature.properties.iconcategory] but i'd recommend storing it a separate object. If you would do something like this:
var icons = {
    'iconGreyHouse' = L.icon({iconUrl: "/markerIcons/house_icon_grey.png",iconSize: [20,20]}),
    'iconRedHouse' = L.icon({iconUrl: "/markerIcons/house_icon_red.png",iconSize: [20,20]}),
    ...
}

Project data from a single geojson when multiple geojson files are present


Tag : javascript , By : Kristian Hofslaeter
Date : March 29 2020, 07:55 AM
Hope that helps You can use queue.js to club all json loading and when all the json is loaded do the necessary action of drawing the projection.
Something like below:
queue()
    .defer(d3.json, 'geoData/naLand.geojson')//this will load the json for land
    .defer(d3.json, 'geoData/PNW_Municipalities.geojson')//muncipality
    .defer(d3.json, 'geoData/CanadianBorder.geojson')//canadaborder
    .await(makeMyMap);

function makeMyMap(error, land, muncipality,canadaborder) {
//make your map
}

Leaflet.js - Tilelayer visible above geojson layer. GeoJSON interactivity issue


Tag : javascript , By : BooTeK
Date : March 29 2020, 07:55 AM
around this issue You're not using the Leaflet library properly (e.g. manually appending a layer to a HTML container), assuming you will know the CSS class of the pane, etc).
Use this instead:
map.createPane('labels');    
map.getPane('labels').style.zIndex = 1000;
map.getPane('labels').style.pointerEvents = 'none';

var positron = L.tileLayer('http://{s}.basemaps.cartocdn.com/light_nolabels/{z}/{x}/{y}.png', {
    attribution: '&copy; <a href="http://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors, &copy; <a href="http://cartodb.com/attributions">CartoDB</a>'
}).addTo(map);

var positronLabels = L.tileLayer('http://{s}.basemaps.cartocdn.com/light_only_labels/{z}/{x}/{y}.png', {
    attribution: '&copy; <a href="http://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors, &copy; <a href="http://cartodb.com/attributions">CartoDB</a>',
    pane: 'labels'
}).addTo(map);

Leaflet Draw "Cannot read property 'enable' of undefined" adding control to geoJSON layer


Tag : javascript , By : Mare Astra
Date : March 29 2020, 07:55 AM
wish of those help Unfortunately Leaflet.draw plugin does not handle nested Layer Groups (same for Feature Groups / GeoJSON Layer Groups).
That is the meaning of the Leaflet.draw #398 issue you reference: they advise looping through the child layers of your Layer/Feature/GeoJSON Layer Group (e.g. with their eachLayer method). If the child layer is a non-group layer, then add it to your editable Feature Group. If it is another nested group, then loop through its own child layers again.
var geoJsonGroup = L.geoJson(myGeoJSON);
addNonGroupLayers(geoJsonGroup, drawnItems);

// Would benefit from https://github.com/Leaflet/Leaflet/issues/4461
function addNonGroupLayers(sourceLayer, targetGroup) {
  if (sourceLayer instanceof L.LayerGroup) {
    sourceLayer.eachLayer(function(layer) {
      addNonGroupLayers(layer, targetGroup);
    });
  } else {
    targetGroup.addLayer(sourceLayer);
  }
}
var Hazards = L.geoJSON(null, yourOptions).addTo(map);

for (i in polygons) {
  var item = {
    "type" : "Feature",
    // etc.
  };
  // toAdd.push(item);
  Hazards.addData(item); // Directly add the GeoJSON Feature object
}
for (i in polygons) {
  var coords = polygons[i]["coordinates"];
  var style = getStyle(polygons[i]["category"]);
  var popup = ""; // fill it as you wish

  // Directly build a Leaflet layer instead of an intermediary GeoJSON Feature
  var itemLayer = L.polygon(coords, style).bindPopup(popup);
  itemLayer.id = polygons[i]["ID"];
  itemLayer.addTo(Hazards);
}

function getStyle(category) {
  switch (category) {
    case 'Rabid_Beavers': return {color: "#663326"};
    case 'Fire':   return {color: "#ff0000"};
    case 'Flood':   return {color: "#0000ff"};
  }
}
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