Digital Geography

Open Data in the UK

lidar D

The Ordnance Survey is UK’s mapping agency and frequently releases free datasets. Their OpenData policy is quite progressive compared to Germany’s and they’ve recently published some fresh datasets that anyone can use. All you need to do is to register and to acknowledge them. The new datasets are: OS Open Map – Local; OS Open Names; OS Open Rivers; and OS Open Roads. They include data on urban and rural features, an index for all the location names in the UK, a generalised open water network, UK’s connected road network and much more. All this adds up to their existing…

Landsat in Love with QGIS: the newest coup from Luca

landsat previewThe normal way of getting Landsat data for your GIS projects often was: visit a Landsat data mart like landcover.org, earthexplorer or WIST, search for your area and time and download/order your desired data. Once you’ve done this, you were prepared to add, analyse and publish this data/results with QGIS. Luca Congedo from the blog “From GIS to Remote Sensing” .

How to create a wind map in QGIS

vector fieldA few days ago I saw Franz Leonardo’s post on the ArcGIS group on facebook: He visualised wind speed and direction in ArcGIS for a wind map and I thought by myself: let’s do it with QGIS… Here is the tutorial which covers some aspects of interpolation, symbol levels, classification and formulas…

Geocoding Addresses in ArcGIS: the other approach

Universities in Baden-WürttembergToday I stumbled upon a post from the German ESRI office and their blog gisIQ and a little tutorial (English translation) on how to geocode addresses in the ArcGIS platform. I was asking, whether there is a possibility to use other geocoders as well and so I tried to build my own solution without credits and with the possibility to choose a geocoder. Fortunately the Python world offers some nice little scripts. So let’s use geopy!

ArcGIS Open Data

Pie chart with highlightningFor 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…

Short Announcement: QGIS 2.8 Wien released

2015-02-22 19_08_16-Program ManagerQGIS 2.8 (the new “Long Term Release”) was released a few days ago. It is a minor release according to the changelog but it will be supported in this setup at least for the next year: Some good news for all those working in a bigger, administrated environment as it is always a problem to update software in these bigger infrastructures. New features: >1000 issues flagged by static analysis tools fixed new code commits and pull requests are now automatically tests against our testing framework. more responsive browser support for contextual WMS legend graphics custom prefixes for joins creation of…

GISconnector for Excel

GISconnector

GISconnector for Excel – the beginning of a beautiful friendship between ArcGIS and Excel The GISconnector transforms ArcGIS and Excel into an ingenious overall system: The power of Excel is available in ArcGIS and vice versa – ArcGIS and Excel turn into an integrated working environment. This unique combination enables a smooth transfer of data and functions between the two programs – this works without an editing session. The GISconnector for Excel software completely revolutionizes the way you work with ArcGIS – a giant step towards time saving and error minimization. 2 Add-ins communicate with each other: Use the shortest…

Creating ARCs in QGIS: The Python Way

curves in QGISSo I came across this nice little project which focussed on trip planning and route over large distances… And there was this nice little post from Nathan Yau at flowingdata.com where he describes the making of great circles from one point to different other points in R and the other example from Anita Graser where she shows how to deal with an Arc in QGIS but using postgis functionality. So what about QGIS itself and a programmatic way? See yourself…

No tags

Maps of “Out of Eden Walk” by Paul Salopek (National Geographic)

Out of eden walk

Today I had the chance to attend a lecture by Paul Salopek in Tbilisi, Georgia. This lecture took me to the idea to write a short review about Paul Salopek and his project here on Digital-Geography because he mentioned several times that mapping his journey is one of his main goals. Some would wonder now: Which journey? – I’ll tell you what’s about: Paul Salopek is a journalist of National Geographic who is doing an amazing project at the moment. He is walking from the birthplace of humanity in Ethiopia at the pathways of human spreading around our globe for more…

Create A Raster Layer Index With QGIS And GDAL

Auswahl_015

When working with raster datasets, it is hard to keep an overview of the raster files in use and their coverage. Most raster data providers may keep metadata in the filename itself, like path, row and a timestamp. But for more convenience, it is possible to create an index of your raster maps. This article will show you, how to accomplish this in QGIS or with the Terminal.

GeoTiff compression comparison

Benchmark

In remote sensing you often have to deal with large datsets because their spatial or temporal resolution is high. A typical Landsat 8 scene clocks in at 0.7 – 1 GB and if you are trying to process satellite images for a continent or even the globe you’re easily looking at multiple terrabytes of input data. I am currently working with MODIS time series data, which will use about 4 TB of space even before any processing is done. Therefore I started looking into compression methods. One of the easiest ways to save space is by employing the compression methods some file…