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

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4
votes
1answer
679 views

What is the best practice to show GPS movements on map (Openlayers or Leaflet) using DB and Geoserver?

I have GPS unit which update the DB with Points every 10 seconds. I want to show the position in real time (as much as I can) on map using OL or Leaflet. What I did is serving the Point as Layer in ...
4
votes
1answer
712 views

Existing ArcGIS Rest Services - What platform to use for building mapping application?

I have clients that have an existing ArcGIS Server. Map layers are published as rest services and I am going to build a mapping application that displays their datasets. Functionality should include ...
4
votes
2answers
79 views

Big data sets and challenges using the Leaflet client

I am using Leaflet to present around 90.000 data points. My test code is generated using the plugin QGIS2leaf in QGIS 10.10.1. I am using clustering and reviewing the code I can see that this is ...
4
votes
1answer
149 views

Leaflet JS add GeoJSON shape as a hole in a polygon

I have a dataset which already contains geojson. I can add it to my map with the following line of code. L.geoJson(data.geojson).addTo(map); And I get this But I want to achieve this, where the ...
4
votes
2answers
280 views

Visualization of a field in Leaflet

In a Leaflet app I want to overlay raster data (technically speaking, a field) on a web map. The data consists of triples < lat,lon,value >, where value is in range [0,1], for example: ...
4
votes
1answer
210 views

Day and night zone layer for Leaflet

I'm working with Leaflet and I'd like to show the day and night zones adding a dynamic layer to my map. I was thinking to add a static layer with some transparency and make it move every x minutes but ...
4
votes
1answer
599 views

Show markers only at certain zoom levels

I'm building a cycle touring map in leaflet.js, with subjective information overlaid as markers, along the lines of "this is a great road", "this town is quite nice" etc. To avoid information ...
4
votes
2answers
2k views

Click link inside Leaflet Popup and do javascript

I have a leaflet map up and running. It overlays a series of polygons (via GeoJSON) on the map and attaches popups to each polygon. Each of the popups display information about that polygon. I'd ...
4
votes
1answer
6k views

How do I get GeoJSON data from GeoServer into show up on my Leaflet map?

I'm trying to create a simple "Green" map for my city. The idea being that it is a website with a map and layers you can turn on and off. I am serving the data through GeoServer and am using GeoJOSN ...
4
votes
1answer
236 views

Legend items to appear / disappear simultaneaously with Layer turned on/off in Layer Control

I have a number of layers that can be turned on and off with a Layer Control. I’d like the description of each layer to show in the legend if it's turned on. And disappear again as soon as the layer ...
4
votes
1answer
867 views

Does Leaflet.js uses WebGL for drawing on HTML5 canvas?

If someone could explain how does the Leaflet.js library draws object (and map layers) on HTML5 canvas? Does it uses WebGL and its GPU accelerated usage of physics and image processing in any way?
4
votes
1answer
221 views

four color theorem for QGIS 2.0 or Leaflet?

I recently looked at some other posts relating to this topic but as far as I can tell there is currently not a working plugin or script for QGIS 2.0 to achieve a four color theorem for styling polygon ...
4
votes
1answer
2k views

Multiple instance of leaflet on my page

I need a few pointers really; I've got a series of tabs running down the left hand of my page and on each page I have a leaflet map. Each map is based on the choropleth example but I'm running into ...
4
votes
2answers
4k views

How do I add my own map layers to Leaflet

I have a Leaflet map and want to add two of my own small polygon layers (currently in shapefile format, but they could be converted to GeoJSON). Can this be done without a mapserver to publish them ...
4
votes
1answer
4k views

Leaflet marker cluster and popups

I want to develop a map with Leaflet marker cluster. You can see how it looks like here: https://github.com/danzel/Leaflet.markercluster But I need that my markers have popups with more information ...
4
votes
1answer
287 views

Leaflet: Change point icon (geoJSON) on click and change back when clicking another point

I would be very grateful if someone could help me with this. I have a geoJSON (10 points) that is drawn using an icon. I want to change the icon when I click on one of the points and then I want to ...
4
votes
1answer
101 views

Routing ensuring all areas are touched

I'm making a web application with leaflet and OSM. It's all going well, but now I need a little help. I'm searching for a good routing engine, that's capable of creating the most probably taken route ...
4
votes
3answers
430 views

Plot a Raster of Weather data in Leaflet JavaScript Map without generating server-side tiles?

I want to show different weather data I have as binary arrays on a server using leaflet. But I do not want to generate tiles on the server. For each point in an a array I have the coordinates in ...
4
votes
1answer
445 views

Leaflet: how to change default style on a point GeoJSON Layer?

I need to change style on a point GeoJSON layer in a Leaflet map. I'm using the following code: function onEachFeature(feature, layer) { if (feature.properties && ...
4
votes
1answer
215 views

Handling Popups in Leaflet with Overlapping Features

I am new to Leaflet as well as Javascript, and I'm looking for some advice on a basic topic. Currently, I am trying to create a spatial index of library holdings for old topographic maps that people ...
4
votes
1answer
130 views

How can I create drawFeature control in leaflet?

I want to call a callback on leaflet after drawing a feature. In openlayers I do it like this : customControl= new OpenLayers.Control.DrawFeature( tempLayer, ...
4
votes
2answers
121 views

Batch create Leaflet webmaps in QGIS

During a project on the spider fauna of Greece, we have to face the design of distribution maps of the species. A good tool to work with is the design of Leaflet webmaps to be used on the website ...
4
votes
2answers
400 views

Editing PostGIS topology in a web browser

I am trying to conceptualize the best process for editing topology from PostGIS in a web browser. Ideally what I would like to accomplish is the loading of a topology (imagine the lower 48 states of ...
4
votes
2answers
1k views

Leaflet offline tiles problem

I hate to ask this kind of questions, but i ve been stuck for 2 days now: I rendered some tiles with mapnik which i want to serve in my offline application which will run from a portable disk, but ...
4
votes
2answers
945 views

binding nested arrays as geojson popups in leaflet

I am struggling with geojson popups in leaflet.js I have nested arrays as properties for my features - an example would be counts of fish caught at a location (not my actual project data!) ...
4
votes
1answer
3k views

How to add a geoJSON layer to leaflet map?

i am newbie in leaflet & its geojson features... I am trying to test leaflet's functionalities. In fact i have built a map and its layer: var map = new L.map('map', {scrollWheelZoom:true, ...
4
votes
0answers
49 views

Describing borehole information with geojson (javascript)

I deal a lot with borehole information and looking the best way to move it around in javascript / take advantage of javascript libraries (e.g. leaflet) for looking at this information on mobile ...
4
votes
1answer
110 views

Does leaflet.js offer an gutter option just like Openlayers

Currently we are switching from Openlayers to leaflet.js and there is a problem using a WMS layer with leaflet. The WMS being used is Deegree. When a layer is visualised within leaflet there are ...
4
votes
0answers
201 views

GeoJSON shape distorted on Leaflet.js spherical mercator WMS map [closed]

I have a map with a simple WMS layer in spherical mercator projection (rendered by a OSM-Mapnik-TileCache server stack, everything is in EPSG:900913 / EPSG:3857). First: I can't understand why, if ...
3
votes
3answers
1k views

'Home' button leaflet map

is there a possibility to have a kind of home button on my map which will zoom to my initial map view or a specific defined position, resp.? Any help welcome! Thanks
3
votes
1answer
126 views

Navigate two leaflet maps

I am looking for an example where there would be multiple map divs containing leaflet maps. When one is panned I want the other one to pan or zoom with it so they are always in sync.
3
votes
2answers
991 views

Merge geojson polygons with WGS84 coordinate

I have a Geojson file with some adjacent polygons and I want to merge them into one. I know it's a recurrent question but I can't find information for polygons with latitude and longitude coordinates ...
3
votes
3answers
98 views

GeoJSON Rendering in Leaflet

I have published a wms using the QGIS Cloud and on top of it I am overlaying the same data (countries of Europe), using GeoJSON. Have a look at an example here: http://jsfiddle.net/j21kh7ao/ At a low ...
3
votes
1answer
7k views

Combine Leaflet with Geoserver WMS map

I'm not very skilled within the GIS world, however, I would like to know if it's possible to use this map: ...
3
votes
3answers
2k views

How to add a polygon from PostGIS ST_AsGeoJSON into Leaflet?

I try to use the following function to add polygons to my Leaflet map. function polygon(geojson) { alert(geojson); // alert for testing layer = L.geoJson(geojson); layer.addTo(map); } ...
3
votes
2answers
222 views

great circles in QGIS and export in 3857 webmap

My plan is to visualize great circles in a leaflet webmap. So coming from this great postgis article and R version I thought it would work like this in QGIS: create line from two points, store ...
3
votes
1answer
519 views

Display a link in a popup with Leaflet

Hey there! Im working with the Leaflet javascript library. There should be an option to click on my map and view a popup. I already have a code for that: var popup = L.popup(); function ...
3
votes
3answers
772 views

Offline Map Service with Mapnik and Leaflet

I'm relatively new to GIS, so I hope my asking doesn't appear to be ignorant in any way. I currently work on an offline map service solution for usage in areas without internet connection. For that ...
3
votes
3answers
3k views

gdal2tiles.py generates wrong tiles / MapTiler the right ones

I'm trying to generate tiles with gdal2tiles.py and the resulting tiles are stored as 18/132639/164219. If I do the same thing with MapTiler (the GUI variant of gdal2tiles) the tile result is ...
3
votes
3answers
654 views

Is it possible to check incoming GeoJSON to see if any of the features are identical to existing ones before adding to map?

I am working on a Rails/PostGIS app and doing a typical ajax call to retrieve GeoJSON within the map viewport bounds. Whenever the map is shifted or zoomed all of the markers are removed and then ...
3
votes
1answer
953 views

How to avoid corrupt geometries when translating between TopoJSON and GeoJSON?

I'm trying to display some geojson vector features on a leaflet map. The size of my GeoJSON is too big (25.4mb of data, 8.47mb gzipped), so I'm trying to use a TopoJSON format to reduce the size ...
3
votes
2answers
4k views

How to label GeoJSON polygons?

I'm using Leaflet combined with GeoJSON features. Is there a way to label GeoJSON features (in this case - polygons)? It should get labels from feature.properties.name This is my code where I ...
3
votes
1answer
4k views

Leaflet: How do you use removeLayer?

This is driving me mad. See the Leaflet tutorial for adding a layer control to your map: L.Icon.Default.imagePath = "Scripts/images"; var mapUrl = ...
3
votes
2answers
824 views

How to load big geo-data file into web application

I am building a web app where I show details in map. I load data using geojson file (190 mb). I was looking in different possibilities to show the data, here there are: Leaflet GeoJSon: it should ...
3
votes
1answer
3k views

Add simple image layers to MapBox / Leaflet?

Is there an easy way to add simple image layers (with no, or very limited, GIS data) to Mapbox and/or Leaflet? Google maps seems to have the ability to add custom layers, simply by attaching the SW ...
3
votes
2answers
173 views

Convert data to another Coordinate Reference System

Assuming I've a point like this : POINT (751318 9760879) This point is in EPSG:27700 coordinate reference system. How do I convert the point to display in a map with EPSG3857 coordinate ...
3
votes
2answers
861 views

GeoJSON formatting for Leaflet

I am using http://GeoJSON.io as the source for my data, which is then to be displayed via Leaflet.js. I found that leaflet neads the file to include "var name = {" but GeoJSON.io doesn't like it, ...
3
votes
1answer
925 views

How can I make a leaflet control open by default?

I'm using leaflet to display a map. I have a control section that I'd like to be open by default, but I can't find a way to do it through the API. Is there a way to do this?
3
votes
2answers
594 views

Slippy map format

When do you decide which to use? I've started using Geoserver and it seems like map files are downloaded to the browser (using Leaflet) in the WFS format. When I look at OSM, Mapbox etc, they use ...
3
votes
1answer
766 views

How to save a Leaflet or OpenLayers map for opening later?

Can a webmap state be saved to a text file or something for restoring later? Like if I set up a map with a particular zoom and choose my layers and draw a polygon or two, can it be saved to a file and ...