Questions tagged [leaflet]

An Open-Source JavaScript Library for Mobile-Friendly Interactive Maps

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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 ...
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8 votes
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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....
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7 votes
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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 ...
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6 votes
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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 ...
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6 votes
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2k 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, ...
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5 votes
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633 views

Controlling the visibility of a FeatureGroup in Folium with an HTML checkbox

I'm working on a project in Django where I want to show layers on a map by checking or unchecking boxes which I created using bootstrap. I am aware it is possible to use LayerControl to get these ...
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5 votes
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1k 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....
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  • 51
4 votes
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Cloud-Optimized GeoTIFF overlay on Leaflet?

I want to load external Cloud-Optimized GeoTIFF files onto a Leaflet map as overlays, and manipulate the colors based on user input. I've found examples online that appear to to this exact thing, but ...
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  • 585
4 votes
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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, ...
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  • 253
4 votes
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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 ...
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4 votes
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364 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 ...
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3 votes
1 answer
323 views

Update content of popup on a polygon click event in Leaflet?

I work with Leaflet.js v 1.7.1 and have stuck with a problem of updating popup content data of data The data set is on a local disk Currently I have a local set of data: var data =[ { type: &...
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3 votes
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54 views

Disabling checkbox in layers list while exporting in qgis2web

Is there a possibility to disable the checkbox on certain layers in the layers list (Leaflet export)? I found something similar already here: qgis2web - show specific layers in layer list but ...
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3 votes
0 answers
138 views

Layer ordering of ST_ASMVT tiles in Leaflet

I am generating MVT tiles for multiple layers in Django using the following query: WITH bounds AS ( SELECT ST_Segmentize(ST_MakeEnvelope(8247861.100083642, 3551570.082242422, 8252753....
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3 votes
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583 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 ...
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Large GeoJSON file in Leaflet performance issue

I have a large GeoJSON file (now it is about 22MB with 4K polygons but it is going to contains about 10k polygons) I load the file in Leaflet using L.GeoJSON.AJAX, on each feature I attach two ...
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3 votes
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204 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. ...
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3 votes
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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....
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3 votes
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560 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 ...
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3 votes
0 answers
1k views

How to change the layer selection view from Radio button to Image in Leaflet

I have implemented the below example to show the multiple base layers of map in my application using LeafletJs. Leaflet JS LayerGroup example I'm able to successfully implement the same but I'm ...
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  • 131
3 votes
0 answers
229 views

Extend / override Mapbox-gl 'baselayer' loadTile

Similar to how Leaflet's guide shows how to override L.TileLayer's getTileUrl method in place of your own (and L.GridLayer's createTile method), I want to know how to extend/override Mapbox-gl's ...
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  • 131
3 votes
0 answers
747 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"; }; ...
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  • 143
3 votes
0 answers
2k views

Leaflet Draw: edit/delete features of different layers

I use Leaflet Draw and Leaflet WFST plugins to create/edit features and save my edits to PostGIS Database (hosted by GeoServer). I have three layers: points, lines, and polygons. I manage to make new ...
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3 votes
2 answers
2k 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....
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  • 31
3 votes
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2k 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?'...
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  • 6,269
3 votes
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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 ...
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3 votes
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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 ...
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3 votes
0 answers
252 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 ...
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  • 149
3 votes
0 answers
447 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 ...
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  • 83
3 votes
0 answers
1k views

get Layer Id of a specific Marker

I have polygons represented in Leaflet. Then I added some markers over these Polygons. var = customMarker = L.Marker.extend({ options:{ Layer: '' }}); I extended marker to store the ...
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  • 141
3 votes
0 answers
216 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', '+...
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  • 3,308
3 votes
0 answers
935 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 ...
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  • 31
3 votes
0 answers
133 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 ...
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3 votes
0 answers
286 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 ...
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3 votes
0 answers
215 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., ...
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3 votes
0 answers
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 ...
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  • 3,160
3 votes
0 answers
855 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 ...
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3 votes
0 answers
771 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 ...
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3 votes
0 answers
4k 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 ...
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  • 131
3 votes
0 answers
1k 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?
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3 votes
0 answers
729 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) { ...
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  • 3,510
3 votes
0 answers
1k 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/...
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  • 131
3 votes
0 answers
426 views

TypeError: L.Proj is undefined in leaflet

I am using leaflet 0.7.3. I am trying to load a wms tile: var crs = new L.Proj.CRS('EPSG:2236', '+proj=tmerc +lat_0=24.33333333333333 +lon_0=-81 +k=0.999941177 +x_0=200000.0001016002 +y_0=0 +ellps=...
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3 votes
0 answers
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 ...
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3 votes
0 answers
315 views

Creating polygons for a choropleth map using PostGIS

I have a grid of points, each with a value to it as shown in the image below. The data was retrieved from PostGIS and rendered in Quantum GIS. The final result should be a polygons of a choropleth map ...
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  • 1,567
3 votes
0 answers
873 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. ...
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3 votes
0 answers
517 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&...
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3 votes
0 answers
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 ...
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  • 383
3 votes
0 answers
721 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 ...
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  • 131
3 votes
0 answers
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 ...
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