The good news: In the Grunewald there are still enough trails and enough space that you can avoid the greatest numbers of visitors even on a sunny and serene Sunday in October. Otherwise, it felt like half of Berlin was on the road in the main areas of Havelchaussee, Großer Stern and Krumme Lanke. (The other half probably on a day trip in Brandenburg ;-)) The foliage is in full bloom: beeches are yellow to brown, lime trees are light yellow, maple is sometimes red. As always, the course was dry and soft as butter.
3 days ago
On the edge of the Baruther glacial valley, the E11 makes a big detour - not without reason. There it branches off together with the castle hiking trail into the charming valley of the Briesener Bach. On this way today we found ourselves bedded on fresh leaves, which shone like a fairytale in all colors from yellow to red. The 3 km along the stream are just fantastic! In Klein Briesen (former manor) you pass a small church that is well worth seeing.
The Briesen mountains, which are actually a sand dune densely planted with pine trees, contributed to the further diversity of today's tour. Then the quiet and open expanses of the Baruther glacial valley. Wonderful soft sand paths, lined with old oaks. Luminous contrasts e.g. between red leaves and lemon-yellow oilseed rape (2nd seed). East of Ragösen we hung a second loop through the plain before we got back to the starting point via Dippmannsdorf on the E11. The temperatures and the sun felt almost like late summer today - it was phenomenal.
4 days ago
Graph theory? Is closer than you think. Every time you automatically connect two start and destination points in the Komoot route planner, a corresponding algorithm searches for an optimal connection for us.
Another mathematical problem: In a complex network of paths (e.g. a park) I want to walk each route at least once. What is the shortest overall route that is necessary for this?
As a case study, I'll take the Heinrich-Laehr-Park in Zehlendorf, the route map of which I first presented on paper (Fig. 1) and which I walked through for the first time today. The route network has 61 junctions and 104 individual routes (of different lengths). My strategy was to go through a couple of the longitudinal axes and otherwise roll up the park like a honeycomb from bottom to top. Of course I had to run not a few stretches twice, luckily not three times either ;-) Komoot showed 11.4 km, although today I unfortunately had major dropouts with the GPS for the first time. In planning mode, the "tour" was 11.0 km long (komoot.de/tour/275509291). It occurred to me that I had forgotten point 61 and that I had not found the right path in the area of points 17 and 18, which is why today's run was not entirely "complete".
Now the questions: Was that one of the shortest overall routes? How do I determine the shortest total route? Are there any usable analog strategies (without a computer) with which one can also (almost) optimally fulfill the task?
In picture 2 I have drawn a few trivial solutions on a square grid. You can see that in a composite network, quite a bit of redundant, double-running route quickly comes together. (For the right case I have now found a solution with s = 14, but you don't start and end at the same point.) You can read that you can use a "tree algorithm" from graph theory and with plenty of storage space and computing power can solve such problems exactly.
But since there are resourceful computer scientists, potters and hiking experts in the community, I would be interested in which strategies you propose to come close to an ideal solution "only" with the human brain.
6 days ago
How about the Prignitz? The name "Kyritzer Seenkette" alone makes you want to travel. What we had not expected (spoiled by the Brandenburg lake landscape) was a "water management system".
Arrived in Lellichow: low water level, desolate banks, blue-green algae. Not a bird far and wide, but a slightly putrid smell in the air. Well - this turned out to be the "Dossespeicher Kyritz", a reservoir, a reservoir or a dam, whatever you like to call it ... in the middle of the lowlands. In 1979, several originally separate lakes were dammed a few meters to provide water for agriculture. OK - I first had to press the reset button in my head in order to delete my pre-made (desired) ideas.There are then many hiking options along the lake: the regular beaten path on the (high) bank, the walk across the exposed "beach", sometimes also a road in the second row. From the high bank beautiful views along the tube-like water. A stiff breeze down at the water's edge. At Schloss Karnzow we suddenly came to the private property in the forest and first had to look for a way to the street again. The dam in Stolpe is not a beauty and is fenced in for security reasons.
Then return on the west bank, alternating on the paved Dosse city cycle path and the trail near the shore. The beach is littered with dead tree stumps that seem bizarre. I named one of them the "dancing root". Then the parade view of Karnzow Castle on the other side. Quite a few mushrooms in the forest. (A few parasols ended up in the pan with us in the evening.) Calm evening mood in the setting sun and the beautiful little village of Bork at the end. My highlights on this hike were the high bank sections in the upper part of the lake. (For example, it reminded me of the Schmöldesee.)Conclusion: Here you can come here. (But that's probably enough ...) The more natural Untersee is definitely worth a try.
October 18, 2020
"... the light that changes forever." (Karl Hagemeister). That statement was true today when one looked at the sky. The island of Töplitz (formed by the Havel, Wublitz and a shipping canal) is not necessarily known for hiking trails, but from our point of view it has proven to be quite varied. Beautiful views of lakes, the Havel and its side arms as well as the very spacious meadows and fields. Charming little village goddess where we bought a jar of quince jam and two pairs of knitted socks by the roadside. A highlight from my point of view was the single trail on the Göttinsee and Sacrow-Paretz Canal. A few lengths on concrete lanes could not be avoided on this hike, but in view of the recurring change of perspective they were to be beared. Finally, a quiet end in the fields between Grube and Golm with the autumn sun setting. For us it was a delightful excursion into unknown terrain away from the main paths.
October 11, 2020
It is autumn and we are all waiting for colorful forests. That sounds almost like "Christmas is coming soon and the snow is falling softly ..." I was actually able to find a (!) Red leaf and a few yellow ones in the forest today. So everything is in the "green" area. Otherwise this was more of a "compulsory event" than a "pleasure round". The day was short and by 6:00 pm it was really dark. I only had a limited desire to meet wild boar. An interesting observation was that the associated digging trails became more intense the closer I got to the settlement.
October 9, 2020
A kind of continuation of yesterday's tour, but starting from the direction of the "Schumacher settlement" in Ketzin. This section of the middle Havel is an Eldorado for river lovers: water areas and bulges rich in movement (Trebelsee), strong side arms, islands seemingly in the middle of the river, tributaries from beyond the dike, venerable trees in the flat meadows. In the Trebelsee flocks of ducks and geese were preparing for their journey, chattering.
We really liked the Deichweg because it is easy to walk. (On the other hand, it would be tough on a bike tour - this is also not planned) You stay away from the villages, you can only see church towers from a distance. In the south of the Götzer Berg (and the unmistakable landfill). Due to the changed viewing angle, the way there and back did not look like a duplication.
The simple overall route from Klein-Kreutz - Ketzin / Haus Brückenkopf over the dike is approx. 20 km, so it could easily be done as a river-related day hike. Frank Meyer took 28 km from Ketzin to Brandenburg and also praised the dyke section very much komoot.de/tour/42618696
October 5, 2020
There and back hike along the middle Havel. Starting point in Klein Kreutz, turning point on the dike near Roskow. First strong autumn colors, today illuminated by a warm autumn sun. All paths except for the cycle path near Saaringen are pleasantly soft (earth or sand). In many places you pass directly by the water, in other sections you have a wider view from the dike onto the seemingly endless meadow landscapes. Humming ship operation on the Havel. At the turning point, the Götzer Berg on the other side of the Havel was within reach.
October 3, 2020
Running lap in the Grunewald, again starting at Onkel Toms Hütte (as long as this place is still called that.) The Grunewald was flooded with light again today. I don't want to comment much, except that I approached the way to the Teufelsberg very gently so that I can survive the frontal ascent (about 50 meters in altitude with an estimated 30-40% gradient) on the former ski slope :-)For all non-Berliners: The Teufelsberg is the largest rubble mountain in Berlin that was piled up after the Second World War. On the mountain there was a listening station for the Western Allies, which is now partially used as an event location. In the highly recommended film "Cleo" by Erik Schmitt (2019), the Teufelsberg with its underground catacombs is one of the central locations around which the plot revolves.
September 30, 2020