It was just a small idea but I haven’t slept much since it came to my mind to build a plugin fo QGIS. It should create a basic webmap from your current layers without coding and with popup functionality and changeable basemaps using leaflet. Meet my new daughter: qgis2leaf!
Dear folks, most of you probably know how to map things using software on your pc. Some of you might also know cartoDB. We like their service as our job-page here on digital-geography.com is based on their tables, API and GeoJSON export functionalities. Additionally it’s for free (with some limitations)… The guys from CartoDB now offer an online learning event which will give newbies the chance to map their data in a very interesting online mapping engine.
I just found a nice web interface for converting Shapefiles to geoJSON, the preferred format of vector geodata on the web. And yes, you can also convert back from geoJSON to ESRI Shapefile.
As Daniel already wrote: There is an awesome tool available online. With geojson.io you will be able to add, edit and remove spatial data used maybe in webmapping application online without using a GIS system anymore. Now I made a little video about the usage.
The leaflet API is very simple and tries to deliver best performance and style for commonly used features like tilelayers, points and lines and markers in general. So when we would like to visualize points it is possible to have a very large numbers of points. So lets have a look on such an basic example. I’ve created a point shape file with QGIS which has approx. 1.000 points embedded. Let’s have a look on a normal webmap with this density of information: As you can see, we’ve inlcuded a second js file with the point information called points_rand.js. You…
Within that tutorial I will show you how to: add a geoJSON file using pure Leaflet open a geoJSON file with D3 open a TopoJSON file with D3 add a map-overlay to a leaflet map using D3 Again…we begin with a simple map … already seen in D3 mapping basics and in geoJSON & Leaflet Add a geoJSON file using pure Leaflet You should know how to do this! Just add some very simple data to the map, as we have already done it in a previous post! Import the data file… …add the data to the map… …define the…
The new JSON Format GeoJSON allows you to easily embed geographical features in your leaflet webmap. Additionally you can create it very easily in the open source GIS QGIS aka Quantum GIS. In this tutorial I’ll show you how to export features to GeoJSON from QGIS and embed them into your leaflet map.
In our first post we concentrated on the creation of a table in leaflet and simple ways to administer our data and to embed the map in a webpage. Today we will consume only the table with Leaflet.
We have already introduced cartoDB which is a platform for storing, administering and visualizing spatial data. One straight feature of cartoDB is the usage of GeoJSON for exporting their tables. In this tutorial I’ll document a working example on consuming this layer with leaflet. But first we will start with the easy part of creating the table in cartoDB.