Digital Geography

AHP for ArcGIS 10.x using Python

Hierarchy

When it comes to site selection problems or suitability models, the spatial Multi-Criteria Analysis (Weighted Overlay) is the most commonly used method. It’s easy, simple and popular. However, if it’s your first time to come across this method, it’s highly recommended to have a look at this link. After defining the problem you want to solve, the next 4-steps are followed to perform this method. Determine significant layers. Reclassify the layers. Weight the input layers. Sum up the weighted layers My concern was always about how I can assign a weight to each layer in a kind of scientific way.…

Panorama Geodata eXtractor

Skärmbild från 2015-04-16 22:07:10

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.

Some ways to produce high-res DEMs – tools and data

kaz

Many of us use digital elevation models (DEMs) for a whole bunch of different applications. There are some standard products which everyone should know, like SRTM1, SRTM3, ASTER, GLOBE or ETOPO1 for the land surface or GEBCO for bathymetry. However, they have a relatively low resolution and are therefore not suitable for all purposes. During the last few years there has been a huge progress in producing much better DEMs, especially local ones, using a wide range of techniques like LiDAR, photogrammetry, image correlation, structure-from-motion (SFM) etc. Some of these techniques make use of powerful, but expensive equipment (e.g., LiDAR),…

Introducing: My personal application list

tilemill exportOnce again I switched from Windows back to Ubuntu as I only needed Win for my granted ESRI license but hated to be “interrupted” by automatic updates, missing dll libraries and crashing flash container plugins on Firefox. So now I am building my personal computational slave once again based on Ubuntu and wanted to share with you my list of applications that I need for my daily work with geodata, matrices, graphics, cartographic outputs and statistical analysis.

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…