Digital Geography

D3-Basics – All you need is a selection!

Since a while I am programming with the JavaScript library D3.js … and … I am addicted to it! As I would like to present some tutorials on D3’s fantastic possibilities to create and design webmapping solutions … I think it would be good to give you a description on the things that I would identify as elementary. Caution! This tutorial could be a little bit too detailled for you, when you are a skilled JavaScript programmer! I am sorry for that! But when you are a noob in JavaScript, as I was when I began to program with D3,…

QGIS Plugins — OpenLayers

Click for previous article in this series about RasterCalc How often have you been working on a project in QGIS and wanted some nice background imagery, perhaps for a quick and dirty evaluation of your own data? I find I need this with growing frequency and a great way to do it is through the OpenLayers plugin for QGIS. Of course, if you know of a good WMS for your area of interest you can always go that route, but the OpenLayers plugin is a great addition to your QGIS toolbox. The OpenLayers plugin is available through the official QGIS…

a web-map with OpenLayers (part 3)

In the first two parts in our series on “getting to know openlayers” we concentrated on the question on layer consumption in form of basemaps and labels. We will enhance this a little in this tutorial. First of all we will use the famous modis products to serve our webmap, we will adjust the visible area of our web-map, set different parameters regarding the initial look and feel of our web-map and distribute it through our webpage. if you are not familiar with the initial frame in our html-document see this page. First of all we will use this famous…

types of web-maps: concepts and possibilities

In my recent articles I was writing some hints and tutorials for creating a webmap. So what is the basic concept behind it and what are the possibilities. 1. Hail the GMAP creator GoogleMaps was probably the main step in webmap perception and usage. Until now it is the quasi standard application for viewing spatial content. The ongoing developments in the keyhole markup language increases the possibilities and usability in everyday work including geocoding and usage of raster as layers:

create a web-map: step 2 or DIY

Since we have managed to get a very simple web-map running on our website, it may be a need for some persons to distribute their own shapefiles using a web-map. In this case it is a good choice to take a closer look on GeoServer. This will provide the mapping engine and uses the OpenLayers library for this as well. But you can skip using the basemaps and just share and show your own shapefiles and raster.