Spring at the Gulf of Bothnia

The spring is coming to Finland and meltwater is running through rivers into the Baltic Sea. The exceptionally cloudfree Landsat 8 imagery from 2016-04-14 shows beautiful features in the Gulf of Bothnia near the Finnish coastline. Some remaining ice cover still exists at the Bothnian Bay, but algae has already begun to form at the Archipelago Sea.

 

Below is a zoomable natural color composite of the Landsat 8-imagery in 30 m resolution:


Geocachers view of the Southern Finland

This is how the Southern Finland looks like to a geocacher.

Adventures

Below is a time-lapse video of all hidden caches. Each dot is a hidden cache, red dots are new caches each day. Lots of adventures available, though this might not say much to non Finns. You may want to switch to a full screen view to see the details.

Augmented historical maps

There is a set of old city maps of Turku (Finland) at Kapsi. As a resident, those maps are interesting in their own right, but when they are georeferenced, a whole new world of opportunities open up.

So I opened up QuantumGIS and georeferenced the maps of Turku from 1888 and 1950, and overlayed the current transportation network on the hand-drawn maps from the past. It’s nice to notice that the old main transportation pathways (bridges, roads to other cities) and landmarks are still in place and in everyday use!

City map of Turku from 1888 augmented with transportation network from 2015
City map of Turku from 1888 augmented with transportation network from 2015 (click to enlarge).

 

The city map of Turku from 1950 augmented with transportation network from 2015
The city map of Turku from 1950 augmented with transportation network from 2015 (click to enlarge)

Continue reading Augmented historical maps

Waterfalls in Finland (map)

The website Suomen Vesiputoukset has compiled all major waterfalls in Finland into a neat catalog and provide a KML-database as well. The number of waterfalls is rather restricted, so it would make a nice roadtrip for the summer holiday to go and visit some.

You can browse the collection via the map below.

The waterfalls are mostly small, but luckily some of them are easy to access:

karkkila_smallvarkaanoja_smallakaslinkka_01

I converted the data into an ESRI Shapefile to be more usable in GIS software. You can download the shapefile here: Suomen-Vesiputoukset-19092014_shapefile

Algae blooms from satellite imagery (Landsat 8)

I’ve been lately tinkering with Libra, a free service to browse and download satellite imagery from Landsat 8 satellite.

This is an image from Landsat 8 satellite (2014-07-23) showing massive algal blooms at Archipelago Sea.

landsat_2014_07_23_web

You really should check this huge high resolution image to get a sense of scale.

Those tiny dots are large ships cutting through the algae mush:

landsat_closeup_1