Digital Geography

Accessing Landsat and Sentinel-2 on Amazon Web services

The cloud has made it easier to process large amount of data, and satellite imagery processing benefits from cloud processing too. One of the cloud services that offers access to satellite images, and abilities to process them in the cloud – no more need to download it to your computer and process it there – is Amazon Web Services. If you’ve never worked with cloud processing, getting started with AWS can be a bit daunting. This tutorial gives beginners an introduction to accessing satellite images – Landsat and Sentinel-2 – on AWS.

The new flickr2qgis plugin for QGIS

In the last week I saw a post on the German ESRI page called GIS-IQ which featured a new widget for ArcGIS which needs you to have the “ArcGIS Web AppBuilder Developer Edition 1.2”. This widget lets you fetch images from flickr and probably show it on the map. I haven’t tried it yet but I thought: lets build something similar for QGIS… so here is my flickr API plugin for QGIS

Short Announcement: SRTM 1 Data Worldwide

The digital elevation dataset resulting from the SRT Mission in the year 2000 is probably the most widely used digital elevation dataset in the world. It was first released with a 90 at ground resolution in a more or less global level (56° S to 60° N). In 2014 the White House announced the release of the 30 m original solution dataset. So they released parts of the dataset one-by-one. Our author Christoph just mentioned an update via Twitter.

Landsat in Love with QGIS: the newest coup from Luca

The 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” .

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…

short announcement: Berlin geodata downloadable…

I don’t know what’s wrong with the governmental insitutions in Germany/Berlin: They have this law, that all the geodata are somehow under an open license but to me it’s always a little hard to find it. Once you’re on the website you need to visit the site of Geodateninfrastruktur (GDI)->Geodienste to find sources for WFS, WMS or downloadable data: Once you find it, lots of data is waiting for you! you can get historical maps for Berlin, DOM and DEMs (in 2 and 5m ground resolution), soil key figures, ground water tables and other stuff. In the end you can…

short announcement: TopoToolbox 2: Geomorphometry made easy in MATLAB

< p align=”justify”>Digital elevation models (DEMs) exist today for the entire globe with consistent quality. Improvements in sensors and data processing give a clue that in the future elevation data will be available in even better spatial resolution and accuracy. Discovering the richness of information inherent in DEMs should thus be supported by good software. Here, I want to give a brief account of TopoToolbox 2, the second version of a MATLAB toolbox for exploring and analyzing DEMs. Dirk Scherler from Caltech and I have been working on many changes to the previous version to make TopoToolbox faster, more memory…

short announcement: QGIS 64bit

So I’ve checked our twitter time line this morning and came across this nice little line: @willoxh tweeted that there is a new version of qgis which enables to work with qgis in 64bit mode. For the record: Enabling a programm to work as 64bit version means you increase the possible amount of information in each calculation step as you can adress more memory per calculation step. Additionally you can hold more information in your program. Best example is probably the amount of satellite data you have in your project. Running QGIS in 32bit mode means the program can only…

short announce: Reverb @NASA the new WIST

Sorry to talk about this important tool with a little delay. As I was lecturing at the university I was using the Warehouse Inventory Search Tool (WIST) by NASA to collect my raster data and download them. It was a great tool but looked a little old. The biggest difference to services like landcover.org or the SRTM Tile Grabber is, that most data was ordered and delivered by FTP. It was not a big deal as most data was available for free but I think for a lot of users this was not “convenient” enough… Nevertheless Reverb- the new WIST-…