Hacker News Board Hacker News, browsed like a classic message board
Live data from Hacker News

3D map of the Czech Republic, made from 12.5cm/px imagery (2017)

mapy.cz

Post reply on HN
Print view View original

61–70 of 123 posts

Re: 3D map of the Czech Republic, made from 12.5cm/px imagery (2017)

#63

Post by lucgommans »

isoprophlex wrote: post #24
lucgommans wrote: post #12

Earlier quoted context omitted.

Indeed, something like 25cm or better is typically shot from airplanes. I don't remember what the physical limit is for image quality given a reasonably sized spy satellite (iirc it's around the 20cm mark), but commercially at least, the high quality imagery is all airplanes. Governments often commission such planes to fly ~yearly at something like 10 cm, as well as commissioning height maps[1], but the very good stu…

Doesn't PDOK provide 8 cm resolution photos of The Netherlands?

Recently at an OSM meetup with the local government in Aachen (Germany), they mentioned that some imagery they shot was deemed too invasive and only used internally. I thought that was 10cm, but now checking what is available, looks like I was wrong! Probably it was 5-7cm then? Or maybe this was rather about the imagery available from different angles, so you can see into gardens from different directions?

In iD I see that indeed the PDOK imagery is now labeled 7.5cm, but checking that against the Belgian and German 10cm:

PDOK 7.5cm: https://snipboard.io/fbWqYM.jpg

AIV Flanders 10cm: https://snipboard.io/Ahn4lJ.jpg

NRW (Germany) 10cm: https://snipboard.io/RpT3vA.jpg

PDOK's looks awful, much worse than 10. Maybe some regions are available in a higher resolution?

Re: 3D map of the Czech Republic, made from 12.5cm/px imagery (2017)

#65

Post by [deleted] »

yojo wrote: post #33
sorenjan wrote: post #13

Earlier quoted context omitted.

This looks very useful and would bring electricity prices way down. The best time to start building would have been years ago, the second best is today!

I assume you’re joking, but in case you’re not - the plan would put the capital city (Prague/Praha) under 200m of water.

[deleted]

Re: 3D map of the Czech Republic, made from 12.5cm/px imagery (2017)

#66

Post by googlryas »

yojo wrote: post #33
sorenjan wrote: post #13

Earlier quoted context omitted.

This looks very useful and would bring electricity prices way down. The best time to start building would have been years ago, the second best is today!

I assume you’re joking, but in case you’re not - the plan would put the capital city (Prague/Praha) under 200m of water.

We just need to float it. A new Venice of the North. Take that, Amsterdam!

Re: 3D map of the Czech Republic, made from 12.5cm/px imagery (2017)

#67

Post by habi »

reaperducer wrote: post #34
folli wrote: post #26

Very nice! Obligatory and shameless self promotion everytime the topic of 3D maps comes up: I recently created a web app to visualize GPS tracking files in a 3D terrain. You can upload your GPX or FIT files and it generates the 3D Terrain using Babylon.js It's called https://cubetrek.com

I recently created a web app to visualize GPS tracking files Off topic, but since you work with GPS tracking files, perhaps you can recommend a GPS tracking device for me. Until last year, I used one I got around 2005 that was about half the size of a pack of cigarettes. You turned it on, and it would start logging waypoints at 10 minute intervals to a standard text tracking file on a microSD card. I could unload tha…

What a blast for the past! I still have a functioning Wintec GPS tracker which I bought in 2007. One battery lasts for some days, I have multiple batteries… It’s barely larger than a pack of matches. Currently they sell This model here https://www.win-tec.com.tw/portfolio-item/wbt202/, I have a WBT200.
Post reply on HN