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26th Nov 2017 15:58 GMTTony Peterson Expert

I haven't complained in a long offense meant to Zmasek, who can upload any mineral-related photo he wants.....but how does a lo-res, B&W, topographic relief image like Nov 26 POTD ever get chosen for the honor? I would like the editor who picked it, and any self-designated supporter of the choice, to explain why this is a notable image. As for objects you keep in your house, no POTD should be chosen that is not either beautiful, or useful. I find this neither. Historical images of mines and miners, etc. I understand. But I don't get this one.


26th Nov 2017 17:50 GMTUwe Kolitsch Manager

Tony: it's a high-res LIDAR image, and those LIDAR maps, which are provided for free by some countries, have been of extraordinary help on locating old (x000 to x00 years) mines, dumps, prospects on wood- and vegetation-covered areas.

26th Nov 2017 18:27 GMTAlfredo Petrov Manager

If only I had had access to images like that back when I was exploring old asbestos mines in the Alto Chapare rainforest in Bolivia. Life would have been so much easier!

26th Nov 2017 19:11 GMTFranz Bernhard Expert

I fully agree with Uwe! Such an image deserves POTD very well. This technique has (not only!) put forward searching for ancient human acitivies in an unprecedented manner. And the best - they are available for free to all (Unfortunately not for every region of the earth).

Franz Bernhard

26th Nov 2017 21:08 GMTChristian Auer Expert

My working collegues and I use these maps on a daily basis. It makes the exploration of unknown regions quite easy. You pick suspicious spots very comfortable at home at your computer and check the spot in reality. Found already many old mines this way.

I agree that its probably not a great photo but I`m sure that several ppl get some info that they like - and well that`s reason enough for a POTD.

26th Nov 2017 21:31 GMTAntoine Barthélemy

It might be that no one would have complained if the caption had been more informative ...

26th Nov 2017 21:46 GMTColin Fearon

Sorry. I have to agree with Tony. Great idea but POTD, not so sure. I am sure the LIDAR maps are of great help and very useful but how helpful are they. There are lots of other topographical searches which provide the same information - what's the point?

26th Nov 2017 22:14 GMTJolyon Ralph Founder

As I've said before if you don't like the POTD then email us and we'll happily change it. Please allow 24 hours for a response.

26th Nov 2017 23:10 GMTTony Peterson Expert

OK, after more thought, I realize what the problem is (for me). Antoine prodded me. Is this the actual raw data from a LIDAR scan (that's how it reads), or is it, as it appears, a shaded relief representation of a DTM generated from LIDAR data? What's the source (no reference is given)? Following the link, I see it may come from public domain data. Yes, a better caption might have drained my poison pen. And if it had been presented side-by-side with an aerial photo that seemed to show no mining activity, its utility would have been obvious.

Uwe, it's 651x488. This is not anyone's idea of hi-res. You've forgotten more mineralogy than I'll ever know, but come on.

As usual, Jolyon finds a way to explain to me why I'm being foolish. I just want to keep the heat under those who choose these POTDs. What is your reasoning?

thanks to all,


26th Nov 2017 23:20 GMTJolyon Ralph Founder

Actually, I questioned myself with the managers why this one was chosen.

Part of the reason to choose a POTD is to encourage debate, and I think we've all learned something interesting from this.

26th Nov 2017 23:43 GMTOwen Lewis

Hear, hear. I certainly have.

27th Nov 2017 04:13 GMTDoug Daniels

I also wondered about that POTD; did not look into any details, so didn't know it was a LIDAR image. So, the POTD was showing the use of one of the newer methods of exploration. Yes, it wasn't a great photo, but I imagine that's what most LIDAR images look like. Again, another tool for those exploring, and you have to learn how to interpret the image. Perhaps a better explanation of the photo would have helped (ya think?) And, I didn't know that there were a lot of these available on public sites. That info in the explanation would have been helpful also.

27th Nov 2017 10:37 GMTUwe Kolitsch Manager

> Uwe, it's 651x488. This is not anyone's idea of hi-res.

For publicly available LIDAR maps, it is hi-res.

Professional archeologists have, on request, access to a ten-fold higher resolution.

27th Nov 2017 12:51 GMTReiner Mielke Expert

This image is an excellent example to show that POTD on Mindat is not the recognition of the photographic abilities of the owner of the photo, artistic merit, rarity, or value of the image presented, rather as Jolyon said to encourage debate or present something interesting. I think this type of POTD has far more value than a competitive POTD and is nice to see.

27th Nov 2017 13:10 GMTPaul Brandes Manager

I saw the POTD and thought "wow, that's something different!" It is nice to see variety, whether it be a pretty specimen, a beautiful photo of a locality, a colourful map from the early days of mining, etc. To me, it gets rather boring and nauseatingly predictable to see day after day of mineral specimens. Don't get me wrong, I like to see a beautiful mineral just the same as everyone else, but variety is the spice of life and I hope the folks who select POTD candidates keep this in mind for future submissions.

27th Nov 2017 13:55 GMTTimothy Greenland

I found it most interesting...


27th Nov 2017 14:19 GMTNorman King Expert

My question is more often, POTD...........why not?

What with the embracing of rocks as worthy objects for our consideration, and interest in variety of subjects highlighted by POTD, perhaps more photos of rocks will be selected. Just wondering. For example, the rock outcrop photo below is the second-most viewed among the nearly 2,000 photos I have uploaded. There are reasons for that, you know.

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