Monday, April 19, 2021

First cross section from a 3D model

I've been trying constructing 3D models from few caves with the LiDAR sensors in iPhone. While I've been able to rotate these models on screen easily, I also wanted to see whether I could construct more traditional maps from these models. But it has been a big learning curve to use the 3D modelling software. Today, with the help of Olli, I finally managed to make my first cross section of a cave model in Blender

I used the model from the main cave in Vihti's Rokokallio as the starting point. This is a vertical cross section of the main crack in this cave, the darker areas are the cave holes and the lighter areas are rock. With a complete model, I can make these cross sections along any axis or from any part of the cave.

A lot of work remains... but this is a nice start.

Read more urban exploration stories from theurbanexplorer.net, and other underground stories from planetcaver.net. Read the full Planetskier series at planetskier.net, or all blog articles from Blogspot or TGR. Photos and text (c) 2021 by Jari Arkko. All rights reserved.

Wednesday, March 31, 2021

More Kauniainen cave maps and 3D models

 

I spent Sunday biking and walking in Kauniainen's forests, mainly in the Kasavuori ("pile mountain") area. I wanted to visit a couple of small holes there are in the cracks and boulders of the rocky landscape on this "mountain". And draw a couple of simple maps about them, and use my new iPhone 12 Pro to record 3D models. 

This isn't to say that these are really caves. They are just small holes, enough to have one person hide from rain perhaps, not really caves in the traditional sense. But, it is all we have in Kauniainen, so in the name of documenting EVERYTHING...

Below there are some new pictures from the cave of the sunset, one of the two actually cave-like places in Kauniainen (even if these too are small). And there's a map. But most interestingly, there's a 3D model that you can rotate on your screen, here. You can also download the model if you want, in many formats. For instance, GLB format is here.





Stockmann cave #1 pictures below. And there's a map. The 3D model that you can rotate on your screen is here. The downloadable model in GLB format is here.


Stockmann cave #6 pictures are below. And there's a map. The 3D model that you can rotate on your screen is here. The downloadable model in GLB format is here.

Read more urban exploration stories from theurbanexplorer.net, and other underground stories from planetcaver.net. Read the full Planetskier series at planetskier.net, or all blog articles from Blogspot or TGR. Photos and text (c) 2021 by Jari Arkko. All rights reserved.


New cave (sort of) in Kauniainen

While cataloguing Kauniainen's tiny caves (if one can call them that), I came across another one. A small tunnel between two boulders. The tunnel part is maybe 3 meters (though with a small crack at the top for some part of that).

I call this cavelet "Kahden kiven luola" or the cave of the two rocks. The coordinates are N 60.217182 E 24.691909, and there's a map here.

Also, new since February, I try to make a 3D model of every cave I visit, using my new iPhone 12 Pro and the Polycam application. The 3D model from this cave can be viewed here. If you want to download the 3D model, it is available in GLB, OBJ, STL, and DXF formats.

Overhang part to the side of the tunnel:


3D model:

Read more urban exploration stories from theurbanexplorer.net, and other underground stories from planetcaver.net. Read the full Planetskier series at planetskier.net, or all blog articles from Blogspot or TGR. Photos and text (c) 2021 by Jari Arkko. All rights reserved.

First biking of the season!

 

Well, I had no other wheels since the car broke down...

Had a nice outing though, around Lippajärvi and Pitkäjärvi in Espoo. Good, sunny weather, even if still cold.

Read more biking stories from planetbiker.net. Read the full Planetskier series at planetskier.net, or all blog articles from Blogspot or TGR. Photos and text (c) 2021 by Jari Arkko. All rights reserved.

Friday, March 26, 2021

Looking for caves in Lohja's Linnanmäki in Karstu

The evening's excursion was to Lohja's Karstu area, in search of caves. The Linnanmäki is a high hill and cliff in Karstu, and the book Suomen Luolat notes that there are two caves on the hill. One was supposed to be inaccessible without climbing equipment. But as usual, the coordinates were inaccurate, so I ended up going around the entire hill, and I think found the other cave plus four other small roof/shelter caves.

Here are the caves and other interesting things:

  • Cave 1, high up on the cliff. I did not find this, but it has been reported in the book Suomen Luolat. Perhaps it was too dark already.
  • Cave 2, a broken devil's churn that forms a roof or shelter cave. Very nice place to camp out or sit by the fire. Nice forms. Coordinates: 60.296735, 23.930707. There's also a map and a 3D model (download GLB).







  • Cave 6, a small roof/shelter cave. Coordinates: . There's also a map.

Read more urban exploration stories from theurbanexplorer.net, and other underground stories from planetcaver.net. Read the full Planetskier series at planetskier.net, or all blog articles from Blogspot or TGR. Photos and text (c) 2021 by Jari Arkko. All rights reserved.




Thursday, March 25, 2021

Serena at the quiet hour

 

Today's outing was in Serena, a small commercial ski hill in northern Espoo. Serena combines skiing with summer activities from downhill cars to tree climbing routes, and one of the largest spas in Finland. It has been very popular... the Corona times have hit it as well, however. Nevertheless, skiing was great.

I went at the last hour, for the last 45 minutes or so. That's a bit expensive from the point of view of getting the ticket, but most people had left by then, so I was able to ski alone and not risk infections in busy lift lines. And enjoy the magnificent sunset!!!

I also liked Serena's variation, with streets, and the rolling hills run. It is a nice place to ski at!



This article has also been published at TGR. Read the full Planetskier series at planetskier.net, or all blog articles from Blogspot or TGR. Photos, videos, and text (c) 2021 by Jari Arkko.

Sunday, March 21, 2021

Grottberget cave

 

I wanted to get some exercise, and ended up walking 3-4 hours on snowshoes in Siuntio. I always need a 2nd goal for such trips, however, and this time it was to visit the Grottberget cave, and see if any of the surrounding cliff areas have additional caves.

The Grottberget cave is spectacular for a Finnish cave. Made through crystallisation / erosion, it is 10.6 meter long tunnel. Ice stalagmites were going from the floor, and looking very pure, see-through ice.

I also made a 3D model with my iPhone's LiDAR sensor and the Polycam application. iPhone 12 Pro models have this sensor. And now I'm experiment with exporting the models to 3D modelling software and seeing what I can do with it.

'The main cave is at N 60.16194 E 24.13763, and the map is here and the 3D models here in OBJ, GLB and STL. The little hole is at N 60.16348 E 24.14130. The small cave under the boulder is at N 60.16440 E 24.14502, and its map is here.

Video of running the model in Meshlab, first with textures and then without:

Pictures from the main cave:






The little hole looks like this:

The cave under the boulder looks like this:

Read more urban exploration stories from theurbanexplorer.net, and other underground stories from planetcaver.net. Read the full Planetskier series at planetskier.net, or all blog articles from Blogspot or TGR. Photos and text (c) 2021 by Jari Arkko. All rights reserved.