Digital Geography

Heatmap, JavaScript, Openlayers and canvas

This article is a continuation of the article “Heatmap and Interpolation: it is easy in OpenWebGIS” about creation of Heatmap and Interpolation with the help of OpenWebGIS interface. We are now describing the process of creating a heatmap, based on any point layer, using JavaScript, OpenLayers 2.x and canvas element (as part of HTML5 technology). Describing the process we will expect that you certainly already have some basic knowledge of programming language JavaScript and can handle OpenLayers library (which is an open source provided under the 2-clause BSD License) JavaScript library for displaying map data in web browsers.). Perhaps the…

Heatmap and Interpolation: it is easy in OpenWebGIS

In this article we consider the creation of Heatmap and Interpolation with the help of OpenWebGIS interface. In the next article it is planned to describe its technical implementation using JavaScript, OpenLayers 2.x and canvas element (as part of HTML5 technology). Recently, in an article “Some new (June 2015) features and functions in OpenWebGIS” it has been announced to revise the interpolation module completely. This promise has been kept, and at the moment in OpenWebGIS you can build a heatmap and make interpolation by the method of Inverse Distance Weighting (IDW). It is planned to add (if it is possible)…

CSV to HTML 101 webmap

Alright, away from python scripting, I want to share a small tool CSV to HTML 101 with you, guys. I used VB.NET to develop it in order to help non-GIS experts from converting a CSV file to a web page using leaflet.JS library. Honestly, it’s not that complicated tool, but it gives them that push to start a web map especially if they have not dug that deep in web development, javascript and leaflet. However, I’m one of these people, so  please don’t judge my ugly code 😳 The developed tool should meet the following criteria: Simple enough to be used by my grandma.…

Spatial Big-Data: 10 stunning services

In the last month the German website Spiegel-Online showed some nice examples of big-data combined with geodata. Geodata get’s more important with every GPS-enabled device that is sold, form that will store your address, IP that is monitored, customer in a global market. Let me Introduce you some stunning examples of geo-enabled web applications. Maybe you get some inspiration to power your business with some spatial data too.

Routing in QGIS… with OSM

Routing with Google is quite cool as the database/network is probably the best currently available. But the terms of services limit the possible usage. So what about OpenStreetMap? By figuring out how to use OSM for routing I found it much easier to get routes into QGIS with OSM compared to the Google way. Check it out….

Overview: R Cheat Sheets

Recently we had a discussion about where to find a nice cheat sheet (No! We are not talking about Simon the Sorcerer walk-throughs). Especially for scripting languages cheat sheets are an excellent way to support your learning attempts and are a handy tool for your every work in data visualisation, automation of tasks and analysis steps. So let’s have a look on R cheat sheets.

Panorama Geodata eXtractor

It’s been a while since I wrote here on DG, but I’ve been busy writing on my own blog in Swedish. However, now it’s time to reveal something I’m pretty pleased with, that you maby can use as well. A simple (well reasonably so) method to extract geodata from panoramic photographs, by using open javascript libraries, some javascript of my own and a lot of head scratching.

ArcGIS Open Data

For a year, ESRI’s open data initiative is online. As I’ve heard about it for the first time I was just thinking: nice move to get people into their ArcGIS online environment. But I have to admit: I was not looking and exploring their platform. Now I stumbled upon a recent post on reddit and there it was again: opendata.arcgis.com has 25,000+ open datasets all accessible by a common API. Full disclosure: I work on the team that builds the product. So let’s have a look at it…

DataSF or how to do open data right

In 2010 the City and County of San Francisco’s official open data portal was launched. To me it is the ultimate experience for publishing/consuming open data: based on a WordPress system the city distributes data for several categories: Economy and Community City Management and Ethics Transportation Public Safety Health and Social Services Geographic Locations and Boundaries Energy and Environment Housing and Buildings City Infrastructure Culture and Recreation There are 820 datasets available at the moment. Depending on the source of the dataset you will either be able to download the data directly or to display it as table: You can…

Maptime Berlin: what was/what will be

In the middle of September the first Maptime Berlin took place. I was totally amazed to see so many people sitting there, being interested in mapping, opensource, cartography and software. At least 40 people from different places of the world with different background (sociology, coding, styling, etc.) met at the Supermarkt Berlin (an open place to work together) to share their knowledge and learn new stuff. Here just a few photos: What was done at MaptimeBER After a short introduction from everyone Alsino presented what is Maptime all about: bringing people together, share the joy of creating and consuming maps…

Overview: Newest developments from ESRI

At this years 11th geoforum of central Germany ESRI showed some new developments in their ArcGIS online portfolio. Those were published 23rd of September. Let me please introduce you to some of these features. If you came across the website of ESRI you might have mentioned that current ArcGIS offline or desktop applications are beyond the functional possibilities of the new ArcGIS online framework. One of these was the new multi-directional shadow algorithm which came on stage on the ArcGIS online platform and is now a downloadable function. Of course they will be available with the upcoming ArcGIS pro but…