[HN Gopher] Peeking underground with giant flying antennas
___________________________________________________________________
Peeking underground with giant flying antennas
Author : sharpshadow
Score : 99 points
Date : 2024-05-24 13:50 UTC (1 days ago)
(HTM) web link (hackaday.com)
(TXT) w3m dump (hackaday.com)
| OutOfHere wrote:
| Could this help detect landmines?
| hausen wrote:
| Yes, if you scale down the antenna/coil (and the aerial
| vehicle).
| https://www.smithsonianmag.com/innovation/a-ukrainian-teenag...
| rolph wrote:
| this particular rig is too lo-res for that. you need a
| different detector setup, and slower closer flight.
| polishdude20 wrote:
| I wonder if drones could be used for this then?
| macnetic wrote:
| A spinout from my university, UMag Solutions is detecting
| UXO and mines in Ukraine using special drone-mounted
| magnetometers.
| buildbot wrote:
| I'm struck between the similarity between this and the big
| antenna (?) array that the ballon that went over the USA
| carried...
| lupusreal wrote:
| That thing flew over/near Malmstrom Air Force Base (ICBM
| silos.)
| jjwiseman wrote:
| Using OpenStreetMap data to map stuff the balloon flew near:
| https://youtu.be/sQ_sEWodIrc?si=LUfvRR4kvlqQyrZ1&t=16
| dylan604 wrote:
| I had never heard of this MUNDUS tool before, but it looks
| like a very interesting project.
| 082349872349872 wrote:
| Imagine using multiple Project Loon balloons as a giant
| SAR.
| toomuchtodo wrote:
| Potentially related:
| https://news.ycombinator.com/item?id=30022626
| hagbard_c wrote:
| Something similar was experimented with where I live (western
| Sweden) to see if the technology is usable to determine the
| stability of soil layers against land slides. The area around the
| local river - Gota Alv - is known to be prone to landslides so it
| was deemed to be a good test subject. A helicopter carrying
| something which was best described as an enormous chicken run on
| a long line criss-crossed the area mapping it with what I assume
| was ground-penetrating radar. The results [1] show our farm to
| lie on an extremely landslide-prone part of the river valley and
| I know there have been landslides here in the 60's so there is
| something to this method. The subsoil consists of silt (the
| fraction over clay) on top of bedrock, as long as the water
| content stays below a certain percentage it has quite a high
| bearing capacity but once it gets over that it easily liquifies.
|
| [1] https://ext-geodatakatalog-
| forv.lansstyrelsen.se/PlaneringsK...
| Archelaos wrote:
| Is this used in archeology?
| cebert wrote:
| Did you read the article? It discusses the archaeological
| applications.
| mindcrime wrote:
| From the HN guidelines[1]:
|
| _Please don 't comment on whether someone read an article.
| "Did you even read the article? It mentions that" can be
| shortened to "The article mentions that"._
|
| [1]: https://news.ycombinator.com/newsguidelines.html
| IncreasePosts wrote:
| Do you think the spirit of that rule is to bludgeon someone
| with it?
| swader999 wrote:
| Did you even read that rule?
| swores wrote:
| You and I have different definitions of the word
| "bludgeon", and I see no problem with showing somebody a
| site rule they've broken if it's a rule you think worth
| encouraging people to follow (which they clearly do
| feel).
| Archelaos wrote:
| The article mentions the 'traditional' way in which magnetic
| surveys are carried out on the ground in archaeology. When it
| comes to helicopter surveys, the examples are only from
| geology. My question was meant to refer to helicopter
| surveys. I would therefore like to rephrase it: Have
| helicopters indeed already been used for magnetic surveys in
| archaeology?
| foreigner wrote:
| Can it find tunnels?
| bluGill wrote:
| Maybe, but can you understand the data you get to realize it is
| a tunnel?
| m463 wrote:
| if so, it might be fun to fly over the US-mexican border near
| tijuana.
| mhb wrote:
| If not, maybe it could if you pour saltwater into the tunnels.
| aaron695 wrote:
| We did this for anode placement.
|
| You put a anode x hundred yards away from a pipeline to stop it
| rusting. We used to send people into the field with metal spikes
| to measure conductivity to find the best locations. You want the
| anode in a place of high conductivity. This was used instead.
|
| Personally I was dubious on the economics of a few of the things
| that was done on the project, doing this compared to using people
| was a no brainer even if it was $$$$. But all this money and as
| usual the SCADA was crap.
|
| The rig was from mining if you wonder about it's everyday use.
| ehaskins wrote:
| I got to watch them operate out of a nearby airport for about a
| week back in 2022. Definitely an unusual sight.
|
| I'm sure there's more data like this, but that survey seems to
| have produced a large amount of raw data which is publicly
| available.
|
| https://www.sciencebase.gov/catalog/item/636c0b28d34ed907bf6...
| defrost wrote:
| The Hackaday article is referring to Geoscience Australia
| geophysical surveys, Helicoptor VTEM specifically.
|
| Fixed wing surveys are also a thing and more common over ground
| that is _relatively_ flat, choppers get used for ground hugging
| steep ground - the cost per line kilometre goes up by a factor.
|
| All the GA data (radiometrics, EM, magnetics, gravity, DTM's,
| etc) is available online or by request.
|
| Eg:
| https://www.ga.gov.au/about/projects/resources/geophysical-a...
|
| describes a dataset and links to raw data sets.
___________________________________________________________________
(page generated 2024-05-25 23:02 UTC)