All posts by konikolaou

[Tutorial] R on Shiny: A web-mapping solution from RStudio

To begin with, as this is the first post of 2016, Happy New Year everyone..!!

This post will be talking on how can someone easily build a web-map with RStudio and the web framework that they released for R, Shiny. Continue reading [Tutorial] R on Shiny: A web-mapping solution from RStudio

Sentinel-2, a European satellite observation mission of Earth

Sentinel-2 is an Earth observation mission developed by ESA as part of the Copernicus Programme to perform terrestrial observations in support of services such as forest monitoring, land cover changes detection, and natural disaster management. It consists of two identical satellites, Sentinel-2A and Sentinel-2B.

This is the description of Sentinel-2 from the respective page in Wikipedia. This mission will be a great alternative to Landsat or the paid SPOT images, providing images in a great detail and frequency, for most parts of the Earth.

Coming down to some technical details, both of the satellites, Sentinel 2A and 2B will provide multi-spectral images, within the latitude of -56 to +83 degrees (whole Earth, excluding Antarctica), in a resolution of 10m, 20m and 60m and a FoV (Field of View) of 290km. There will be 13 spectral bands that will be covered, including 3 for atmospheric corrections.

Sentinel-2A was launched in June 2015, while Sentinel-2B is expected to launch within mid to late 2016. There are some images that can be downloaded from the website of European Space Agency or directly from the awesome semi-automatic classification plugin for QGis, which was updated to be able to download data directly for analysis.

SLEUTH model for urban sprawl prediction (instructions in Greek)

Hello everyone.

The past year was a very busy one for me. Having begun working in the commercial industry, I had to catch up with the pace in planning fast-changing environments and respond to the needs.
That been said, I will restart my blog with a post that I had to post a long time ago – a manual to SLEUTH written in Greek.

SLEUTH is a model highly developed by Dr. K. C. Clarke, and is used to simulate urban land-use development through sprawl. I won’t refer to it much more, as I have previously analysed it through an older post.
The fact that troubled me is that there are plenty of tutorials on how to run it online, but most of them are written in the English language. So, I decided to write a manual in Greek to all my fellow planners that would like to use it. And a message in Greek, so that someone could easily track it down:

Μπορείτε να βρείτε τις οδηγίες στα Ελληνικά για να τρέξετε το SLEUTH πατώντας το παρακάτω  λινκ:



Kriging with R and ArcMap: Average GCSE scores for London

As part of a practical exercise in the MRes course, we were asked to create a map of London with the average GCSE scores. Since we needed a value for every pixel, and the data are about wards, we used a method of interpolation, and specifically the Kriging method. Also, I went one step further and used Kriging with both R (which is can be integrated in GRASS as well), by using the gstat package and ArcMap. Continue reading Kriging with R and ArcMap: Average GCSE scores for London