Digital Geography

Accessing Landsat and Sentinel-2 on Amazon Web services

Military Grid for Sentinel-2 tiles

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.

Filter Leaflet Maps with a Slider

filter slider leafletIf you create maps you always need to ask yourself: how can I make it as easy as possible to read and still have anything I need in my map… or in short: reduction and abstraction. There are different approaches out there when it comes to web maps. Let me show you how to reduce the number of map elements with a slider in leaflet to filter your data interactively.

Import OSM Data Into A PostGIS Database (The Easy Way)

...and add your selected OSM data into your QGIS canvas.

I often find myself in a situation where I want to work with large areas and datasets of OpenStreetMap data. No matter if you want to use them in a QGIS map or create custom map tiles in Tilemill, with the Overpass API you quickly run into performance issues. Imposm is a great tool to overcome that situation, so you can load OSM extracts (worldfiles in pbf format) with a custom data mapping into a PostGIS enabled PostgreSQL database. The downside: It is hard to set up if you are not a database and system admin guru. This is where…

Software I use in both worlds: Windows & Ubuntu

output_PqU9uiI am somehow a messy guy. After 3 years now my OS was a bit “stuffed” and I decided to go with the flow, erased the whole HDD and installed the new Ubuntu 16.04. LTS Xenial Xerus. Aside from being a Linux user I also work a lot on Windows PCs. SO what tools do I use on my systems that are needed for my everyday GIS / geo-developer tasks? Let me show you my list:

Mapalomalia: First web geological modeling platform

geological modelling

Mapalomalia lets geologists create and visualize 3D geological models from their browsers. It’s a free to use geological modeling platform. I hope people will use it to convey information about our planet that helps humankind to tackle big problems and at the same times makes geological modeling easier. I have developed it with input from many geologists, and by releasing it early I hope to receive more input from many more geologists. Just sign up here to start creating models.

Mapbox updated their mapstyles

Streets by Mapbox

Today I received the newsletter from Mapbox with interesting screenshots of their new mapstyles. The company convinced many users with nice basemap styles already in the past. Now they updated their background mapstyles for webmap usage. Just have a look: All pictures are from Mapbox. In my opinion the new styles fits good for modern map applications. If you’re interested in other background maps, check out this article – Map Compare. If you’re interested in getting more information about Mapbox styles, just visit this Mapbox article.

Short Note: Wikimapia…the World in a Map

edit mode wikimapiaWe all love Wikipedia, right? And as most of you know, Wikipedia also offers the possibility to add some geospatial items to each “article”. By doing so, you can be sure to see the correct part of the former Berlin Wall and not some stupid painted wall in central Berlin… At this point Wikimapia steps in.

From Cloud to GIS: Getting Weather Data.

A small bit of effort to improve presentation

Introduction In this post we are going to look at how to get weather forecast data and display it as a layer in a desktop geographical information system (GIS). The tools that you need are: A desktop GIS. I am going to use QGIS (free software) but I have done this with ESRI ArcMap as well A spreadsheet application. I will be using MS Excel but I have also tried this with Softmaker Office and I am sure LibreOffice (free software) will work or indeed any other spreadsheet application The Natural Earth Quick Start data set. This is a collection…

Extracting information from Sentinel-1

Detected objects from Sentinel-1 image

SAR images can see through clouds and in darkness, and are therefore very useful for operational monitoring of our seas. Detecting ships, icebergs, wind patterns, and oil spills is daily business in Europe with the Sentinel-1 satellite. Want to see for yourself how to extract information from a SAR image? In this tutorial, we’ll use the SNAP toolbox for Sentinel-1 to extract information on the number of ships at sea.

Proud of the Linux world

We are LinuxSometimes I have something to tell, but also need to realize that it is not so easy to explain. How many times have you heard of Linux, or maybe Ubuntu? Probably very often, right? I imagine that the comments were (between you and those who spoke, newspaper or friend who is): “Do I need to delete Windows?”, “It is easy, just if you know to program!” or “but there are problems with the printer…” But what makes me proud is when I ask the question, but you use it for work? The Linux world has had a big leap forward…