Questions tagged [leaflet]
An Open-Source JavaScript Library for Mobile-Friendly Interactive Maps
656
questions with no upvoted or accepted answers
23
votes
0answers
2k views
Leaflet v1 plugin: layer control for ungrouped, grouped, and nested-grouped layers
I need a Leaflet plugin which extends L.Control.Layers. I have the following requirements:
works with Leaflet 1.x
handles ungrouped layers alongside grouped ones
handles nested layer groups
does not ...
6
votes
0answers
723 views
Using WFST in Leaflet: can not move/delete features
I write a Leaflet app which makes use of two plugins Leaflet.Draw and Leaflet.WFST. The first allows to create/edit/delete features, the second saves changes to my PostGIS database hosted by GeoServer....
5
votes
0answers
1k views
Make a grid map in Leaflet
I want to draw a grid map based on the temperature values in Leaflet.
Similar to the illustration below.
Input data: lat, lon, temperature values, cities' names
Parameters: the dimensions of the ...
5
votes
0answers
1k views
What is the best way to display a large shapefile (with polygons) as a layer on a leaflet map?
I have a leaflet map of the UK with around ~2000 points total points and a bit of metadata loading for each point with two side-panels showing the metadata. These points are drawn from several tables ...
4
votes
0answers
890 views
leaflet returns wrong {x} {y} tiles from arcgis mapserver
I'm trying to add a leaflet map to an Angular 2 project, which shows a layer from an ESRI mapserver as a tileLayer. As such:
ngOnInit(): void {
let map = L.map('map', {
crs: L.CRS....
4
votes
0answers
939 views
Load WFS in Leaflet with BBOX query in non-default projection (i.e. not EPSG:3857)
I've had a look at this question: How to add a bounding box filter to this leaflet WFS request? and have been trying to work out how to get it to work in a different projection system, specifically ...
4
votes
0answers
2k views
Leaflet filter on geoJson properties : multiple criteria
I'm using Leaflet filter on geoJson data. I'm able to apply it with a simple criteria :
filter: function(feature, layer) {
return feature.properties.field1 == "yes";
}
I can also apply two ...
4
votes
0answers
294 views
Thematic map exported using QGIS2Web is extremely laggy
I have made a world thematic map and added layers of data for creating graduated color scheme on the country level. I need a interactive map as an output which shows values when user hover over any ...
4
votes
1answer
2k views
Display GeoJSON data on map using django-leaflet?
I want to display GeoJSON data on map in geodjango.
When I use the below code only GeoJSON data like:
{
"type": "FeatureCollection",
"features": [{
"type": "Feature",
"properties"...
3
votes
1answer
1k views
Leaflet make legend with different circle sizes
I would like to make the legend with different circle sizes in Leaflet.
I found one examples:
https://stackoverflow.com/questions/37446283/creating-legend-with-circles-leaflet-r
https://...
3
votes
0answers
111 views
Function fires despite conditional query in leaflet-map
In a map built with Leaflet I created a button to export and download data as geoJSON drawn before by the user with Leaflet.draw.
To prevent an empty download, I am querying the existence of data.
...
3
votes
0answers
2k views
Adding points to map with Leaflet using .forEach function
Trying to add an array of points to a map with a Leaflet with .forEach.
I thought this should work, but alas, it does not:
var jsonData = [
{
"LNG":-75.16472099534634,
"LAT":40....
3
votes
0answers
294 views
Plug in / API for getting sea routes with leaflet
I am developing a maritime routing application prototype with Leaflet.js for my company Deep Blue Globe and using the windy interface.
The problem is since windy uses Leaflet version 0.7.7 there are ...
3
votes
0answers
605 views
PostGIS - Dynamic Server-Side Clustering based on Zoom level
I'm working on a Ruby on Rails application that is showing road signs on the map(leaflet). So, user can browse map and road signs, great. But, if there are a lot of signs and user wants to zoom out, ...
3
votes
0answers
494 views
Markers with customs angle values
I'm trying to make some markers spinnable using this :
target = document.getElementById("mapid");
target.ondragover = function(e){
e.preventDefault();
e.dataTransfer.dropEffect = "move";
};
...
3
votes
2answers
983 views
Basic Authentication in Leaflet
I'm using Leaflet to display map tiles. The map tiles are loaded from a different site using basic authentication.
So the url template looks like this: L.tileLayer('https://username:password@example....
3
votes
0answers
987 views
Leaflet zoom event direction
Is it possible to find out whether the user zooms in or out when using a Leaflet zoomstart or zoom event?
map.on('zoomstart ', function() {
console.log('I am zooming, but am I zooming in or out?'...
3
votes
0answers
2k views
Save Leaflet drawn features with attributes to PostGIS
Goal:
In order to have a fully interactive map, I would like to be able to save some drawn features (in a second step with some attributes that may be grabbed through an input mask form or pop-up) on ...
3
votes
0answers
610 views
Leaflet map in R Markdown - not rendering when placed after other plots
I have an R markdown document using shiny with 6 or 7 plots. They all display until the 7th plot, which is a leaflet map, which doesn't display - when I 'run document' there is a big empty space at ...
3
votes
0answers
199 views
Calculating Detours based on given blocked roads with Leaflet?
Is it possible to use a given route of "blocked roads" and calculate a route from A to B, considering that the given route is off limits using Leaflet?
Where I'm from, there is an annual bicycle ...
3
votes
0answers
362 views
Determining map-projected coordinates in custom CRS for Leaflet?
I have some static USA maps in Lambert Conformal projection that I would like to overlay in Leaflet together with geo-reference support. They are centered at 38N, 98W. I have found that the closest ...
3
votes
0answers
1k views
Can't clear markers from MarkerClusterGroup
i have problems removing all markers befor adding new ones.
var L_Emergency_Access_Points = L.markerClusterGroup();
var EapMarkers = L.geoJson(null,merge_options(globalOverlayOptions,
...
3
votes
0answers
154 views
Proj4Leaflet - Defining World Eckert IV
I'm trying to make a Leaflet map with World Eckert IV projection using Proj4Lefalet. From what I understand, I should be able to define my CRS like so:
var crs = new L.Proj.CRS('ESRI:54012',
'+...
3
votes
0answers
770 views
heatmaps with local maxima, weight, api functionalities
I am looking for a heatmap vizualization on a map, which shows:
local maxima: that means that you always see some "red spots" regardless the zoom. See the picture below.
enables to set a weight to ...
3
votes
0answers
128 views
Image & limit user access by poly
Wondering how do I clip images to polygon outlines in a web map application based on OpenLayers or Leaflet? How can I limit web map users to see (visualize; qualitative) or query (quantitative) within ...
3
votes
0answers
187 views
Blending edges of tile overlay
I am working on a web map using Leaflet and am using purchased satellite imagery as the base map. We want to limit the extent of the high resolution image to the area of interest, so I have resampled ...
3
votes
0answers
176 views
Which Leaflet Basemap with shaded relief should I use for a WebGIS?
I'm having difficulties to show shaded relief in our Basemap.
Where can I find a free and clean basemap service, that shows only shaded relief? With no labels, no roads, no rivers, no cities, etc., ...
3
votes
0answers
2k views
Leaflet.Draw only edit GeoJSON
I am trying to enable editing of a GeoJSON layer in my Leaflet map using Leaflet Draw. I need to allow only a single edit at a time before saving the results back to the database. I tried to implement ...
3
votes
0answers
678 views
Converting KML coordinates to Leaflet
I am trying to convert a Google Map KML file to a csv, to map the longitude and latitude points on Leaflet. But the coordinates keep mis-projecting and some end up off the land mass.
The steps I have ...
3
votes
0answers
657 views
Mapbox GL Leaflet interaction
I've built a map in Leaflet which has a really large GeoJSON file. Currently the only way I can get it to work is if I severely simplify the GeoJSON file down from 100mb to 25mb. I'm looking at using ...
3
votes
0answers
3k views
LeafletJS How to set custom map scale for a flat image map (CRS.Simple)
I've been trying to get a flat image fantasy map working within LeafletJS. I have pretty much everything working well except for the map scale legend where two things are not working:
I can't seem to ...
3
votes
0answers
887 views
Leaflet: get the color of a specified pixel on the map
I need to get the color of a specified pixel on the map. How can I do it using the current API of Leaflet?
3
votes
0answers
688 views
Leaflet filtering existing featuregroup
I have a leftleat map and i would like to filter the featuregroup i am displaying.
exp_colJSON = new L.geoJson(exp_col,{
onEachFeature: pop_col,
pointToLayer: function (feature, latlng) {
...
3
votes
0answers
845 views
Adding an offset to a Leaflet TileLayer on the fly
I'm currently using Leaflet to display 18th century maps of Belgium as a base layer with a vector overlay of the present day road system. Although the maps are absolutely gorgeous (http://www.ngi.be/...
3
votes
1answer
595 views
Receiving data from php script for geoJSON TileLayer?
I want to get geo data as geojson for geojson tile layer requests in leaflet.
I set up a geojson layer like this:
https://github.com/glenrobertson/leaflet-tilelayer-geojson/
A php script answers ...
3
votes
0answers
3k views
How can a leaflet SVG overlay be placed outside of the leaflet-overlay-pane?
I have SVG on top of GeoJSON in my map. How can a leaflet SVG overlay be placed outside of the leaflet-overlay-pane while keeping GeoJSON in place in the leaflet-overlay-pane? (For example, how could ...
3
votes
0answers
804 views
Raster Over Layer in Leaflet from GeoServer
I want to add a raster over layer onto the base layer and the raster layer is published by a Geoserver WMS. I set the raster layer's geographic coordinate system as the same as the cloudmate tiles. ...
3
votes
0answers
469 views
Format tilelayer.wms URL properties such that I add an overlay iteratively to my base map in Leaflet
My base map was created using hard-coded template variables. I am using the leaflet tilelayer.wms constructor and including the URL like so:
url: "http://localhost:8080/geoserver/sf/wmsservice=WMS&...
3
votes
0answers
3k views
How to serve OpenStreetMap Tiles locally using ArcGIS Server 10?
We want to serve OpenStreetMap Tiles locally using ArcGis Server 10 to use as base maps in our ESRI Silverlight and Flex GIS clients.
We've downloaded our regions OSM file and created PNGs using ...
3
votes
0answers
688 views
How do I pass a LatLng Bounds from Leaflet to Mapfish Print?
I successfully fired up a MapFish print server on Elastic Beanstalk, and it prints out the sample spec files fine, but I'm trying to pass bounds from my Leaflet frontend now, and encountering a lot of ...
3
votes
0answers
2k views
Overlaying a mbtiles tile layer produced with tilemill over another layer maintaining transperency
So using leaflet, I'm overlaying my base tile layer as google satellite imagery. I want to overlay another layer (Mbtiles layer) produced with tilemill over this satellite layer. I was successful in ...
2
votes
0answers
50 views
Leaflet.js custom coordinate system
Background:
Display topographic plans of a specific size (1500 meters x 1500 meters). The source images of tiles can be of different sizes and resolutions. It is required to display on the plan some ...
2
votes
0answers
96 views
Why does leaflet treat an svg file differently in an image overlay than a png file and how can I prevent this?
I have a vector graphic in adobe illustrator format (ai).
I would like to partially (only some layers) display this graphic as a basic map. I exported most of the layers of this vector graphic as ...
2
votes
0answers
61 views
Passing Leaflet object geometries to a parametric SQL view in GeoServer
I have a parametric SQL view for a WFS layer in GeoServer with the simplified form:
SELECT pts.id AS id, pts.geom as geom
FROM schema_name.points_table pts
WHERE ST_Contains(%g%, pts.geom);
I want ...
2
votes
0answers
124 views
How to develop responsive layer container in Leaflet?
I'm using leaflet.js to develop a drawing layer tool with the full-page map. Users will draw a group of layers to describe an industrial product's parts.
The leaflet map and its layers should be fit ...
2
votes
0answers
102 views
Leaflet: route machine current position
I would like to insert the current position of the device at the first waypoint. With a function onLocationFound I get the position but I can't add it to the waypoint. Does not work.
is there a best ...
2
votes
0answers
84 views
Leaflet/JS: Adding polylines after pan/zoom
I am using a Leaflet map as an image viewer, and I'm trying to add a 'toggle crosshairs' function that will place a crosshair at the center of the image. I've got it working to a point where the ...
2
votes
0answers
60 views
Adding polygons to Leaflet inset map in R
I've created a map using the Leaflet package in R and added an inset locator map using addMiniMap(). I would like to add polygons features to said inset map.
I've already added the polygons to the ...
2
votes
0answers
42 views
How to extract GeoJSON database column as geometry layer? (column as layer)
Have a one table of country with multiple categories for states. Table as below:
Country table:(converted shapefile to GeoJSON for use in Leaflet choropleth map)
So kind of table converted from ...
2
votes
0answers
62 views
Slope and Aspect calculations giving wildly different results based on zoom using Leaflet
I asked Accessing slope and aspect data using Leaflet? last week about getting slope and aspect as a function of lat and lng in leaflet, and I am in the process of trying to code out a good answer. ...
