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Survey of the Best Online Mapping Tools for Web Developers: The Roadmap to Roadmaps

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There’s nothing quite like a good, useful map.

Today, using online maps is an easy and engaging process. Making your own online maps is not a big undertaking anymore; we have at our disposal a wide range of available online mapping tools, from free and simple, to feature rich and complex to use. For web developers not familiar with web mapping, the agony of choice might be intimidating. You want to make maps, but don’t know where to start nor which tools to use. I am here to help with this list of the best mapping tools.

A Little Bit of History

From its beginning, technology has had an influence on mapmaking and how maps are used. As technology progressed, cartography and mapmaking processes evolved with it, from manually drawn maps on papyrus to interactive maps on the web.

mapping tools for web developers Mapping in the past.

The second half of the 20th century was a turning point for cartography. Computers became a tool of choice. Aerial photography, satellite imagery, and remote sensing changed the way spatial data is gathered. Geographic Information Systems (GIS) were born. Eventually, GIS maps started moving from the desktop to the web, and big GIS vendors started making the first frameworks for online maps.

But GIS mapping is not easy. It requires many server-side technologies, geospatial standards, and protocols, along with their implementations. It requires understanding geospatial data and map projections, knowledge of how to gather the data, how to display the data, which colors to use, how to generalize the data to specific scales, how to place labels on the map, how to set up a server that will serve the maps, how to use a spatial database, and so on. GIS is full of abbreviations, such as WMS, WFS, EPSG, CRS, SLD, GML, TMS, just to name a few, and to know and understand them, you need to read books, academic papers and articles.

The Evolution of Online Mapping

The first web maps typically showed only a single, very small map image. At that time, panning was implemented by moving one step, usually by half of the map size, in one of eight possible compass directions - N, NW, W, SW, S, SE, E, NE. After the user clicked the pan or zoom button, a whole new image would need to be rendered on the map server, loaded over the network, and then processed by the browser. Because of the constraints of the technology, maps only occupied a very small part of the whole web page. To get better interaction, early maps required plugins like Flash or propriety plugins based on Java, or even ActiveX, which worked only in Internet Explorer.

Google turned the mapping world upside down when it introduced Google Maps in 2005. Among its innovations, Google introduced continuous panning by dragging. Their solution was to display a map sliced into many smaller square images called “tiles”. These tiles were rendered and served from a “map tile server,” and are usually 256 x 256 pixels. Zooming and panning now only required loading new map tiles instead of reloading the entire web page. The result was a bigger visible map that covered more than half of the browser window, and offered a smooth experience for exploring the map. Because of the ability to “slip” the map around with the smooth zooming and panning functions, these new maps were called “slippy maps”. Google also allowed scripting, so users could put Google’s maps on their own websites and add their own data to the map. This resulted in another new term being coined: “Map mash-ups.”

Suddenly, online maps become popular; to add a nice-looking map to your website, you no longer needed to be a cartographer, or a GIS specialist. On the wings of the “Web 2.0” movement, and building off modern technologies like HTML5, CSS3, and SVG, that enable easy creation of interactive content, interactive maps are now living a new renaissance.

online maps Mapping in the future?

Map Data

As mentioned before, early online maps were based on sets of GIS data and their spatial geodatabases. Not many people had access to that data, not to mention its price tag. Google and the OpenStreetMap (OSM) project datasets changed that. Google’s database is private and comes with restrictions, while OSM was inspired by the concept of Wikipedia, as a collaborative project to create a free map of the world. OpenStreetMap is built by a community of volunteer mappers, who contribute to and maintain the spatial data.

In short, the biggest revolution that contributed to easy map-making today is that the trouble related to maintaining a map server and the spatial database has been removed.

Choosing a Web Mapping Framework

So, with all the options, how do we choose the right online mapping tool? On the one hand, there are commercial online map providers like Google, MapQuest, Microsoft, and Nokia. These services provide map tiles and propriety JavaScript APIs to view them and interact with a map. On the other hand, there are open source mapping projects that offer easy loading of OpenStreetMap-based map tiles. These include OpenLayers and Leaflet. And then there are projects such as MapBox and CartoDB, which base their business models on the open source libraries and OSM data, and provide added value but are not free.

Let’s take a look at some examples from each of these categories. Here, I’ll discuss several of these online mapping tools, providing a brief overview of each, along with code examples, and weighing the pros and cons. We also wrote a D3.js mapping tutorial that you might find interesting as a separate read.

Google Maps

Let’s start with the most obvious choice, Google Maps. The first version of the Google Maps API was introduced on February 2005, and the current Google Maps API v3 on June 2009. The Google Maps API is not just the JavaScript API endpoint; it includes more projects and offers several different ways to embed Google Maps into web pages with extensive customization.

Current available Google Maps APIs include:

To help you pick the right API, Google developed an API picker.

It is worth noting that while the basic APIs are free, there are some limitations imposed. The first is that maps must be freely and publicly accessible to end users. Second is usage limitations: the service is free as long your site does not generate more than 25,000 map loads each day, over any 90-day period. If you need larger scales or want a private map, or you are running an enterprise or commercial website, you should consider paying for Google Maps API for Work.


Here’s an example of how to implement a simple Google map in code. It shows how to create a simple map using the API, place a marker on the map, and open a popup with a mouse click.

<!DOCTYPE html>
    <meta charset="utf-8">
    <script src="http://maps.google.com/maps/api/js?sensor=false"></script>
    <div id="map" style="width: 600px; height: 600px;"></div>
    <script type="text/javascript">

      var map = new google.maps.Map(document.getElementById('map'), {
        zoom: 10,
        center: new google.maps.LatLng(45.8167, 15.9833),
        mapTypeId: google.maps.MapTypeId.ROADMAP

      var infowindow = new google.maps.InfoWindow();

      var marker = new google.maps.Marker({
        position: new google.maps.LatLng(45.8167, 15.9833),
        map: map

      google.maps.event.addListener(marker, 'click', (function(marker) {
        return function() {
          infowindow.open(map, marker);


The resulting map looks like this:

google map using API


  • Developed and maintained by Google.
  • Lots of different APIs for including a map in your website or application.
  • Big community of users.
  • Very good API documentation, with lots of examples.


  • Are we sure that we won’t see adds at some point?
  • Everyone is using it; all maps (mostly) look the same.
  • Closed and propriety API.
  • No plugins beside those officially developed by Google.
  • Unclear pricing for Google Maps for Work.


OpenLayers was developed by MetaCarta as an open source equivalent to Google Maps, and the first version was published in June 2006. OpenLayers is an onling mapping tool that implements a JavaScript API for building rich web-based geographic applications, with an API similar to the Google Maps API. OpenLayers gained a lot of traction very fast, and development in the beginning was rapid. OpenLayers 2 was released only two months after version 1, in August 2006. The library was constantly under development, and new versions with new features were constantly being added. The downside of this rapid progress was that the version 2 library became very big and clunky, eventually reaching 1MB in size and containing over 100,000 lines of code! While it came with a lot of features, not all were needed by regular users.

This was the major reason for a comprehensive rewrite of its library. The goal was to target the latest HTML5 and CSS3 features, with the same functionality from OpenLayers 2, such as support for projections, standard protocols, and editing functionality. The main focus was on performance improvements, lighter builds, prettier visual components, and a better API. This much-improved OpenLayers 3 was published in August 2014.


Let’s see how same map as in the previous example, this time using OpenLayers 3.

<!DOCTYPE html>
    <meta charset="utf-8">
    <script src="http://openlayers.org/en/v3.2.1/build/ol.js"></script>
    <link rel="stylesheet" href="http://openlayers.org/en/v3.2.1/css/ol.css" type="text/css">
    <script src="http://openlayers.org/en/v3.2.1/resources/jquery.min.js"></script>
    <script src="http://openlayers.org/en/v3.2.1/resources/bootstrap/js/bootstrap.min.js"></script>
    <link rel="stylesheet" href="http://openlayers.org/en/v3.2.1/resources/bootstrap/css/bootstrap.min.css" type="text/css">
    <div id="map" class="map" style="width: 600px; height: 600px;">
      <div id="popup" style="padding-bottom: 45px;"></div>
    <script type="text/javascript">

      var iconFeature = new ol.Feature({
        geometry: new ol.geom.Point(ol.proj.transform([15.9833, 45.8167], 'EPSG:4326', 'EPSG:3857')),
        name: 'Zagreb',
      var iconStyle = new ol.style.Style({
        image: new ol.style.Icon(/** @type {olx.style.IconOptions} */ ({
          anchor: [0.5, 46],
          anchorXUnits: 'fraction',
          anchorYUnits: 'pixels',
          opacity: 0.75,
          src: 'http://ol3js.org/en/master/examples/data/icon.png'

      var vectorSource = new ol.source.Vector({
        features: [iconFeature]

      var vectorLayer = new ol.layer.Vector({
        source: vectorSource

      var map = new ol.Map({
        target: document.getElementById('map'),
        layers: [
          new ol.layer.Tile({
            source: new ol.source.OSM()
        controls: ol.control.defaults(),
        view: new ol.View({
          center: ol.proj.transform([15.9833, 45.8167], 'EPSG:4326', 'EPSG:3857'),
          zoom: 10

      var element = document.getElementById('popup');
      var popup = new ol.Overlay({
        element: element,
        positioning: 'bottom-center',
        stopEvent: false

      map.on('click', function(evt) {
        var feature = map.forEachFeatureAtPixel(evt.pixel,
            function(feature, layer) {
              return feature;
        if (feature) {
          var geometry = feature.getGeometry();
          var coord = geometry.getCoordinates();
            'placement': 'top',
            'html': true,
            'content': feature.get('name')
        } else {

      map.on('pointermove', function(e) {
        if (e.dragging) {
        var pixel = map.getEventPixel(e.originalEvent);
        var hit = map.hasFeatureAtPixel(pixel);
        map.getTarget().style.cursor = hit ? 'pointer' : '';


And the result:

map with openlayers3


  • Free and open source.
  • Feature-packed library for your mapping needs.
  • Plenty of examples.
  • Support for a range of data types and GIS standards.
  • Built-in support for map projections and editing features.


  • Version 3 is still in heavy development, and the API is still changing with every point release.
  • Complicated API syntax.
  • Version 3 documentation is currently not as thorough as it could be.


It is safe to say that Leaflet was born as a reaction to OpenLayers’ bloat, clutter and complexity. Vladimir Agafonkin was asked to build a wrapper around OpenLayers, but he instead created a simple and lightweight OpenLayers alternative, and in May 2011 Leaflet was born. Vladimir focused on simplicity, performance and usability for this online map tool. The core library has only basic functionality, which is enough for most real-life use cases. Still, Leaflet can be extended with a huge amount of plugins that are easy to develop and add on top of the core library. Additionally, Leaflet was developed from scratch with mobile support in mind.

Leaflet is easy to use and has a well-documented API, along with simple source code that is available on GitHub. As a result of its focus on performance, usability, simplicity, small size, and mobile support, it is significantly less complicated than OpenLayers.

Leaflet’s future is looking interesting, too. According to Vladimir, he plans for the next major release to be even simpler, improving performances further, and upgrading the plugin infrastructure.


Here’s the same map as before once again, this time implemented using Leaflet.

<!DOCTYPE html>
    <meta charset="utf-8">
    <script src="http://cdn.leafletjs.com/leaflet-0.7.3/leaflet.js"></script>
    <link rel="stylesheet" href="http://cdn.leafletjs.com/leaflet-0.7.3/leaflet.css" />
    <div id="map" style="width: 600px; height: 600px;"></div>
    <script type="text/javascript">

      var map = L.map('map').setView([45.8167, 15.9833], 10);
      var mbUrl = 'https://{s}.tiles.mapbox.com/v3/{id}/{z}/{x}/{y}.png';
      L.tileLayer(mbUrl, {id: 'examples.map-i875mjb7'}).addTo(map);
      var marker = L.marker([45.8167, 15.9833]).bindPopup("Zagreb").addTo(map);


map using leaflet


  • Free and open source.
  • Small and fast.
  • Simple and easy API syntax.
  • Mobile friendly.
  • Good for getting an online map up quickly and easily.
  • Plenty of examples with very good documentation.


  • Lack of advanced functionality.


A startup named MapBox is trying to revolutionize the online cartographic marketplace, with the goal of building better looking, more versatile online maps. The MapBox JavaScript API employs Leaflet, and is written as a Leaflet plugin. It extends Leaflet functionality, and integrates with other MapBox web services, including MapBox hosting for user-created custom maps and datasets. Besides the JavaScript API, MapBox includes the following connected services:

MapBox offers not only its mapping service, but also access to the data, including privately acquired satellite images, open data from NASA, and community-driven world data from OpenStreetMap. Data styling is done using CartoCSS, a style format created by MapBox, based on CSS and the LESS styling framework. Although the MapBox service offers a free tier, it is limited in bandwidth and storage, and for any serious use the service must be paid for.

Many big companies have recognized the benefits that MapBox provides, and are using it on their own sites. They include Foursquare, Evernote, Pinterest, The Financial Times, GitHub, and Etsy, to name a few.


Here’s an example of a slick MapBox map using a style called Pirates, created by MapBox’s designers. Since MapBox runs on top of Leaflet, the code to embed this in your web page would be similar to the Leaflet example above:

map using cartocss

As mentioned above, CartoCSS is used to style vector tiles in MapBox. This is done using their MapBox Studio, which is also open source. With MapBox Studio, it is possible to create your own map styles from scratch, or change and extend existing styles created by other designers. Once your custom map is uploaded to your MapBox account, you can embed it on your site using the MapBox API.

The following is a sample of the CartoCSS used to get the Pirates baselayer:

@name: '[name_en]';
@name_arrr: "[name_en].replace('([Aa]r)','\1rr')";
@land: #fff8f0;
@water: #cdd;
@park: #cda;

Map {

#admin[maritime=0][zoom>=3] {
  line-join: round;
  line-color: #478;
  // Countries
  [admin_level=2] {
    line-width: 0.8;
    [zoom>=6] { line-width: 2; }
    [zoom>=8] { line-width: 4; }
    [disputed=1] {
      line-dasharray: 4,4;
  // States / Provices / Subregions
  [admin_level>=3] {
    line-width: 0.4;
    line-dasharray: 10,3,3,3;
    [zoom>=6] { line-width: 1; }
    [zoom>=8] { line-width: 2; }
    [zoom>=12] { line-width: 3; }

#water {
  ::b {
  polygon-fill: mix(@water,#fff,50);
  polygon-gamma: 0.6;
  [zoom>=12] {

#waterway {
  [type='canal'] {
    line-color: @water;
    line-width: 0.5;
    [zoom>=12] { line-width: 1; }
    [zoom>=14] { line-width: 2; }
    [zoom>=16] { line-width: 3; }
  [type='stream'] {
    line-color: @water;
    line-width: 0.5;
    [zoom>=14] { line-width: 1; }
    [zoom>=16] { line-width: 2; }
    [zoom>=18] { line-width: 3; }

#landuse {
  ::glow {
    [class='park'],[class='pitch'],[class='school'] {
      [class='park'] { line-color:#ddb; }
      [class='pitch'] { line-color:#eed; }
      [class='school'] { line-color:#edb; }
  ::main[zoom>=0] {
    [class='park'] {
    [class='school'] {
  ::wood[class='wood'] {

#building {
  [zoom>=15] {
    line-color:#efe8d8 * 0.9;
    [zoom>=15] { line-width:0.2; }
    [zoom>=16] { line-width:0.4; }
    [zoom>=17] { line-width:0.8; }

#tunnel { opacity: 0.5; }

#bridge {
  ['mapnik::geometry_type'=2] {
    line-width: 1;
      [zoom>=10] { line-width: 1; }
      [zoom>=12] { line-width: 2; }
      [zoom>=14] { line-width: 3; }
      [zoom>=16] { line-width: 5; }
    [class='street_limited'] {
      [zoom>=13] { line-width: 1.4; }
      [zoom>=14] { line-width: 2; }
      [zoom>=16] { line-width: 3; }
    [class='street_limited'] { line-dasharray: 4,1; }
    [class='path'] { line-dasharray: 3,2; }

Arrgh, matey!

map with mapbox

Take a look at some of the other predesigned MapBox styles here.


  • Extends Leaflet.
  • Big repository of detailed and cloudless satellite images.
  • Detailed terrain data.
  • Plenty of connected services.
  • Beautifully-designed maps out of the box.
  • Graphical interface for styling and customizing existing maps.


  • The goodies are not free.
  • Pricing is based more on traffic than features.


For more complex geospatial data visualization and analysis, CartoDB is one of the best tools out there. It’s a cloud service that stores geographic data in a spatially-enabled database in the cloud called PostGIS, providing tools to access the data, analyze it using the spatial and geolocation powers of PostGIS, and display it using Leaflet.

CartoDB was created as a result of a lack of alternatives for easy geospatial data visualizations and storage. Consequently, CartoDB may be considered an alternative to Google’s Fusion Tables. Users may import data sets in various formats, including CSV, KML or Excel tables, and layer them over maps from common sources such as Google, Here (Nokia), or OpenStreetMap. Since all the geodata is stored in a real database, the data can be accessed and queried with SQL, and then styled with CSS.

The CartoDB service is offered as “freemium;” users who leave their data open to the public can host their projects at the CartoDB website for free. To store private data, import more than 5MB of data or use more than five tables, users must subscribe to a premium plan.


CartoDB is a tool for data visualization, so it is used a bit differently than the other online mapping tool examples. Your CartoDB map will automatically visualize any data that has georeferenced coordinates on the map. So we can show a label for Zagreb by simply adding it to our PostGIS database. Here’s an example formatted in GeoJSON:

    "type": "FeatureCollection",
    "features": [
            "geometry": {
            "properties": {

map with cartodb

However, to really get a sense of what CartoDB is capable of, take a look their gallery.


  • Great for managing and storing geospatial data.
  • Supports lots of data formats and large datasets.
  • Based on proven open source products, such as Leaflet and PostGIS.
  • Freemium model.


  • Not free.
  • Pricing is based on the stored data size, which can get expensive if very large datasets are used.

Other Options for Web Developers

These are the most popular mapping frameworks currently available, but there are other lesser-known options in the wild. If you are tied to the Microsoft ecosystem, they offer an API similar to Google Maps called Bing Maps API.

And, we cannot go without mentioning a dinosaur in the online mapping world, MapQuest. It is still around and offers MapQuest Mapping Tools.

If you are looking for a slightly different approach to map making, Kartograph is interesting because it was created with the needs of designers and data journalists in mind.

Styling Your Maps

All these frameworks offer a way to customize the style and appearance of your maps. MapBox and CartoDB offer styling using CSS or a variation of CSS.

On the Google front, version 3 of the Google Maps API introduced custom styled maps. This finally allowed developers, especially designers, more room to customize the default Google Maps design seen everywhere, and bring it more in line with a website’s overall visual theme. Within the rich Google Maps community, a few styling resources have been born. The most notable is Snazzy Maps, a community of people creating custom styles for Google Maps and sharing them free of charge.

If you decided to go with OpenLayers or Leaflet, then you are limited to pre-rendered map tiles. Fortunately, there is a different range of map tiles to choose, from Google, Nokia, Bing or default OSM tiles, to those specially created by designers, such as Stamen. To get a feeling how many available map tiles exist, or how they look compared to each other, visit the Streetmap Smackdown or Map compare sites.

The Future of Web Maps and Mapping Tools

The future of the mapping world is looking interesting. Here are some emerging technologies that would have looked like science fiction only a few years ago:

  • Vector-Only - Using vector maps instead of raster images with D3.js brings a new world of features that are not possible using standard frameworks. MapBox is also moving in this direction, with MapBox GL, based on OpenGL.
  • 3D - Three dimensional terrain and buildings are now showing up in maps, and OpenLayers v3 ships with built-in support for Cesium.
  • GIS and spatial analysis in the web browser - Already possible using Turf. Turf is a JavaScript library that supports spatial and statistics operations, data classification, and GeoJSON data creation, all within the browser.

Wrap Up

Each of the best online mapping tools listed here has its strengths and weaknesses. For example, the code examples show the simplicity of using Leaflet, versus the complexity that OpenLayers brings. But Leaflet won’t solve your complex spatial problems where OpenLayers will. The choice comes down to what your needs are.

To summarize:

  • Google Maps - Well rounded, established mapping solution, especially for non-developers to get a basic map on the web, along with all the powers that Google is (in)famous for.
  • OpenLayers - For situations when other mapping frameworks can’t solve your spatial analysis problems.
  • Leaflet - Currently, easily the best mapping framework for general mapping purposes, especially if you don’t need the additional services that MapBox or CartoDB provide.
  • MapBox - Fast growing and market changing mapping solution for when you want more control over map styling or have a need for services that others are not providing, such as detailed satellite images, geocoding or directions.
  • CartoDB - If you have heavy datasets, stored in different data formats, look no further.

About the author

Tomislav Bacinger, Croatia
member since May 1, 2014
Tomislav is exploring uncharted areas, bringing a sense of data, and create immersive data visualizations and maps. He has extensive experience in data analytics and data wrangling, in-depth GIS knowledge with a broad geospatial background, and strong expertise in designing and developing web and mobile applications. Maps and visualizations are his passion. [click to continue...]
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Thanks for the article! wonderful article. Consider one more free mapping tool: OpenWebGIS (http://opengis.dlinkddns.com/gis/opengis_eng.html). This project is still very raw, but it already has most of the features you described. Information about it: http://openwebgis.livejournal.com/10393.html
Check MapTiler (http://www.maptiler.com/) in case you want to display your own raster maps, such as a scanned paper map, an aerial photo or a shot from a drone, or some of the open geodata available online from the government. It runs with Leaflet, OpenLayers as well as Google Maps.
Even if you choose to go with Leaflet, you can customize your map. It takes quite an effort to do so, as you need to set up your own tile server (PostGIS + Mapnik), which is a pain, but it's definitely an option.
Ahmed Osman
consider www.cartologic.com/cartoview a lot of leaflet apps ready to deploy
CartoDB also has geocoding
ahmed Wagih
ArcGIS Online?
Sam Gregory
Nice rundown of various elementary mapping implementations. Good to see you left any ESRI product off your list. #toptal
Sam Gregory
Might I add the tt graphics help the article a good deal. Hats off to your design team!
Tomislav Bacinger
Except the first two graphics, others are maps that you would get if you run the provided code examples.
Sam Gregory
I was referring to the first two illustrations - I understand the others are example interactive map implementations.
Stjepan Buljat
I've tried MapBox geocoding API and it doesn't work as I'd like it to :( any good alternatives to Google Places API?
Good work Tommy, thanks for putting this page together
Tomislav Bacinger
I haven't work with geocoding API much to be able to recommend one. I can only guess, but the MapBox is using OSM data, so their geocoding is as good as the data for the area in question is. Did you try MapQuest (http://www.mapquestapi.com/geocoding/) or Microsoft (https://msdn.microsoft.com/en-us/library/ff701715.aspx)? And if you can afford, Nokia Here (https://developer.here.com/get-started#/10134037)
Stjepan Buljat
Thanks for the links...will try them out.
Iqbal Yusuf
Hi Tomislav, First of all thank you very much for a detailed, thoughtful comparison of various map frameworks. Any specific reason ArcGIS Online was left out from this roundup when ESRI holds the biggest GIS market share in the enterprise world? Thanks, Iqbal
Christian Ledermann
while Cartodb, the service is paid for, cartodb, the software is open source
Great article. Only minor niggle: Why is "Developed and maintained by Google." a pro point for Google Maps? The negative sections even contradicts says this and rightly so: "Closed and propriety API.". Would simply remove the pro point ;)
BTW, the point about sites using Google Maps must be "freely reachable", does this mean any kind of webapp with a private login (so not available for anyone but only for select users) would violate this? We developed a web app for a company which is not open but needs a login etc and were considering Gmaps but in the end went with Leaflet (most due to simpler API). Guess this was even a wiser choice then? The T&C of all company developed maps (Google and Bing) are so complicated you never really know if you are using the maps with the proper permission or not (or maybe it is just me ;).
Maia Techera
Hi Tomilav, I would like to know your opinion on what kind of app will do for my case because I'm not a developer. I'm working with an ONG who needs to create a mapping for donors in their page. I tried a pilot with our datebase in Google My Maps, the only problem I found is that the map doesn't have anb option to actualize the map with the data you import from a spreadsheet. We would like to have in our page an interactive map, with comments and photos but we need to be able to keep actualizing it without redoing the map each time. Our datebase is simple. What Mapping Tool would you recommend for us? Thanks a lot!!
Ben Lang
Another great solution for creating custom, beautiful maps is www.mapme.com
Michael Sheaver
I need to create a web page that has a database of around 250 locations around the US. An anonymous user would enter their location and the app will display the five nearest locations in the database along with the driving time and associated contact info (phone number, address, hours of operation, etc.). The user would select the desired location and would be presented with driving directions to that location.The database would be fairly static except for periodic update. Which framework would be best for this application?
Gwyneth Llewelyn
It works, it's very easy to use, and it's cool. However, it's not free — the 'trial version' will put watermarks on all the tiles and also limit them to a certain degree. An alternative is using GDAL2Tiles. It's easily available for most operating systems, but it's unsexy — a command-line tool. Here is an article by Pedro Sousa explaining how to use it to generate tiles: https://build-failed.blogspot.pt/2012/11/zoomable-image-with-leaflet.html He uses Leaflet to show the tiles, but I'm pretty sure this could be used with other frameworks as well.
Gwyneth Llewelyn
An excellent question. When doing corporate websites which require some maps (say, for contacts or so) I <em>never</em> use Google/Bing, because I find their licensing unclear. I'm quite aware that most of my customers are so tiny (and most are non-profit anyway) that they will always fall under the radar of those two megacorps, but... who knows, a disgruntled customer or a troll may always complain to Google/Microsoft, and the tiniest lawsuit from those giants would immediately put those organisations out of business. So... why risk it? Leaflet + OpenStreetMap is good enough for almost all cases. And, of course, if OSM isn't displaying your bit of the world correctly (missing street names, etc.) then all you need to do is to log in to OSM and edit it :-P So that's the extra flexibility you get (Google <em>will</em> correct their maps after some input... a process that usually takes a long, long, long, long time, though. A street near my home took almost a <em>decade</em> to be displayed correctly...)
Gwyneth Llewelyn
... I would say that it mostly means that Google will not drop the API and has a huge workforce behind the Google Maps API, while other solutions — most notably open-source — might be dropped by their volunteers, or the company behind it may go bankrupt, and so forth. Then again, Google also routinely drops their products/APIs. Anyone does still remember Buzz, Lively, or Picasa? :-)
That's a great article! Any change to get an updated version 3 years after?
Umut Badak
If you need to make a choropleth map check out : http://coloredatlas.com Its totally free.
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About the author
Tomislav Bacinger
JavaScript Developer
Tomislav is exploring uncharted areas, bringing a sense of data, and create immersive data visualizations and maps. He has extensive experience in data analytics and data wrangling, in-depth GIS knowledge with a broad geospatial background, and strong expertise in designing and developing web and mobile applications. Maps and visualizations are his passion.