User talk:Strebe

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Sandy Island Exists

I'm surprised how quick everyone is to agree to the party line. Simply using Google Maps satellite, one can see that there's something at the location, and its shape is identical to how Sandy Island was presented on old maps that depicted the island at a close distance. I'm not sure it's a true island, and may be mostly submerged, but there is clearly something there. It seems that one source is now the bible for declaring that this island doesn't exist. More baffling is the insistence that the waters in the area are so deep, meaning there's no chance that anything could be there. Looking at Google Maps satellite, the ocean floor is noticeably shallower at and around the location than in surrounding areas.

I post here because you seemed to be the only voice of reason. What is going on that everyone wants to insist this island isn't real and that nothing could possibly be there, all because one alleged expedition says so. That was enough to remove it from all maps? Very odd. 98.221.141.21 (talk) 08:05, 5 January 2013 (UTC)

It’s difficult to tell what’s going on. From the many sources of data I’ve examined, some have been polluted by using WVS or WDB II vectors as masks, making them impossible to draw conclusions from. You don’t necessarily even know that has happened, making almost all sources of data suspect. LANDSAT data mostly shows nothing, though there are hints. Without someone (else) just going out and looking, I can’t draw many conclusions other than that there IS a seamount there reaching within 40&nsp;m of the surface. That part is pretty clear. It’s not 1,400 m. Parts of it might nearly reach the surface. Strebe (talk) 20:58, 8 January 2013 (UTC)

Conformality of the stereographic projection

Please stop destroying valuable contribution. Read the conformality – it IS DEFINED as preserving angles of curves intersection, and it is good and important to mention that in the article. Conformality, in general, does NOT GUARANTEE preserving ANY OTHER type of angles. In particular, any (spherical) triangle on a sphere has sum of its angles greater than 180° while its stereographic image on the plane has the sum equal 180°. This implies respective angles of the two triangles MUST differ (at least one of them), so conformality in general is NOT 'preserving angles'. --CiaPan (talk) 23:58, 6 February 2013 (UTC)

You’re not wrong. It’s just that your edit goes into more detail than necessary without being complete enough to be good. The very article you reference, conformality, states verbatim, “In mathematics, a conformal map is a function which preserves angles.” Later on, it does talk about intersecting curves, but with greater context: “A map, with is called conformal (or angle-preserving) at a point if it preserves oriented angles between curves through with respect to their orientation (i.e., not just the magnitude of the angle).” The Stereographic article does not include that greater context, and doesn’t need to. It links to conformal is so readers can learn more about it if they want. The usual pithy explanation for conformality is that a conformal map “preserves angles”. The Stereographic article is not about conformality, so it doesn’t need to go into detail. Meanwhile, your argument about spherical triangles is nonsense. No, the stereographic image of a spherical triangle on the plane does not have vertices that sum to 180°. The sum is the same as on the sphere. It’s not as if a spherical triangle maps to a Euclidean triangle on the plane. Strebe (talk) 02:18, 7 February 2013 (UTC)

Grammatical ambiguities

"The surface of a sphere, or another three-dimensional object".

is that meant to be "(the surface of a sphere), or another three-dimensional object"?

or is it meant to be "the surface of (a sphere, or another three-dimensional object)" ?

Clearly, it is meant to be the second, but the IP user parsed it the first way, and thence concluded that it was erroneous and in need of correction, and became upset when you reverted it to the 'incorrect' version. My edit removes the grammatical ambiguity. Okay? DS (talk) 00:24, 5 March 2013 (UTC)

First, you need to move this discussion to the article’s talk page, not mine. I will copy and past all this there.
Second, the phrase you changed was not as you wrote above. You’ve added a comma that didn’t exist and you’re using “another” instead of “other” and you’ve changed “body” to “object”. The full sentence was, “A map projection is any method of representing the surface of a sphere or other three-dimensional body on a plane.” There is no defensible way to read that as, “A map projection is any method of representing the surface… or other three-dimensional body on a plane.” It cannot be read that way because “the surface” otherwise does not refer to anything. The reader simply does not understand English or the topic well enough, as is clear from “his” edits that produced clearly incorrect results. Your “correction” does not resolve anything. If I can misread the original the way the objecting editor did, then I can misread your “correction” as well. I do not agree that just because some random person amongst thousands misread the text, that something is wrong or ambiguous, especially when his “correction” was clearly wrong. Strebe (talk) 01:07, 5 March 2013 (UTC)

Hello. There is currently a discussion at Wikipedia:Administrators' noticeboard/Incidents regarding an issue with which you may have been involved. Thank you. — Preceding unsigned comment added by 184.186.8.148 (talk) 07:40, 6 March 2013 (UTC)

  • I don't know the subject matter enough to have an opinion, but it would probably be beneficial to everyone if you toned it back just a notch Strebe. Regardless of who is right on the merits of the discussion, the discussion appears to be taking place in good faith, and poking people with sharp sticks simply because you feel your perspective is the only correct one seldom produces consensus. So please consider a less confrontational way to communicate. Dennis Brown - © Join WER 14:22, 6 March 2013 (UTC)
I will stick to the facts, but I do not agree that discussion is taking place in good faith. To this moment, the IP editor has not acknowledged a single contrary piece of evidence. He has deleted the authoritative reference and supplied none of his own, merely calling it “bad”. Whatever his agenda is, it is not Wikipedia’s. Strebe (talk) 16:30, 6 March 2013 (UTC)
I'm sure you understand that it is difficult to always guess the faith of the editor when you are very unfamiliar with the subject matter. It is difficult to see inside the mind of an editor. I request only to make sure we aren't making a victim out of someone, IF they are in the wrong. Any help you can provide that makes it more clear where the problem lies is helpful. Dennis Brown - © Join WER 16:37, 6 March 2013 (UTC)
No, my agenda is in fact Wikipedia's (viz. an accurate entry), and once again you're not assuming good faith, in violation of policy. I'm a mathematician so you can understand, I hope, the perspective that I bring. In mathematics a common sphere is 2-dimensional, period. This is intuitively obvious by asking 'How many coordinates are necessary to specify a point on a sphere?' And the answer is 'two'. I understand that sometime 'sphere' is used colloquially, to describe, for example, a soccer ball. This is a geometry we would call a 'ball', not a 'sphere'. Moreover, while map projections in our daily life are typically from 2d curved space (like the surface of the Earth) to 2d flat space (like a road map), this need not be the case, and I believe that the article should reflect that.184.186.8.148 (talk) 02:48, 7 March 2013 (UTC)
Your definition of accurate is inaccurate and you are not the authority of what is accurate. Your claimed credentials are irrelevant. I provided a citation from the most authoritative expert in cartographic map projections in the 20th century. You completely ignored it and worse, you deleted it under your personal theory that it was “bad”. That’s not allowed. Do you not understand that your alleged credentials are irrelevant? You may well be a differential geometer, but has it occurred to you that some of the editors involved are actually expert in the topic and of the relevant literature? What matters is what the literature has to say, not your opinion or mine.
You seem to believe that this topic is a proper subset of differential geometry. It is not. It has its own literature and application, and while the mathematics of projection are the same either way, the terminology differs, the notational conventions differ, and most importantly, the field of map projections has a strong overlap with geodesy and whole host of concerns outside of differential geometry. If you have not read J.P. Snyder, L.P. Lee, and Deetz & Adams, then you are not an expert in this field. Your conventions are not the conventions of the map projections literature, and you cannot enforce them outside your field. When you blather on about only needing two coordinates and about how there’s nothing special about those dimensions and that you can’t project without losing some features and on and on, you’re completely wasting everyone’s time. The people you’re addressing are far beyond that. It’s not that people don’t get it; it’s that what you are saying is irrelevant. You are talking about a different topic and as much as you want this to be the topic you are talking about, it is not. Strebe (talk) 04:01, 7 March 2013 (UTC)
You are violating several wikipedia policies, including WP:CIVIL, WP:NPA, and WP:GOODFAITH. Moreover, your representation of the credential policy is not correct. Credentials are not "irrelevant", but are to be weighed by individual editors as they see fit ([i]cf.[/i], WP:CRED). I am not "blather[ing]", I am a thoughtful person giving my views on that matter.
The title of the article is not "cartographic map projections". It is true if that were the article your view would be correct, since cartography is the practice of making maps, which are, at least to the present day, all two-dimensional. But this is an article about map projections generally, and maps can be of any dimension (check out, [i]e.g.[/i], http://en.wikipedia.org/wiki/Map). The defining point with a projection, conceptually, is that you're going from something curved to something flat and that is impossible to do without "damage" of some sort. That it's a sphere is most common but not necessary. I understand that mathematical conventions are not your conventions, and that is fine. That fact does not imply that mathematical conventions are irrelevant to the article. My view is that mathematical conventions are relevant to the article--indeed essential to it. Why? Among other things, (1) A map projection is a fundamentally [i]mathematical[/i] process and not a matter of convention; (2) there is substantial mathematical discussion and notation in the article; (3) some sentences in the article are false no matter whether you take my approach or yours ([i]e.g.[/i] " a map projection is any method of 'flattening' into a plane a continuous surface having curvature in all three spatial dimensions" (you need not have curvature in all dimensions to produce a projection)).
I made an edit here. I agree that we need not get into the notion of higher-dimensional projections for the purposes of the article. But we should not say that a sphere is 3-dimensional, because that is simply factually false, despite the colloquial usage and whatever your personalized usage is too. If you are willing to concede that in the article I'm happy to remove the tag and not worry about the more obscure concerns of dimensionality.184.186.8.148 (talk) 06:13, 7 March 2013 (UTC)
“But we should not say that a sphere is 3-dimensional, because that is simply factually false, despite the colloquial usage and whatever your personalized usage is too.”
You seem offended when I interpret your behavior. You know what offends me? That you have consistently ignored the citations I have given for my assertions and ignored engaging any facts inconvenient to your position. Calling it my “personalize usage” is offensive, 184.186.8.148. I couldn’t care less if you interpret my behavior; that’s what people do and have to do, and the only difference between people in that regard is whether they voice that interpretation or not. If you’re right in your interpretation of my behavior then I have nothing to get offended about; if you’re wrong, I can’t imagine why I should care; and if you’re somewhere in between then maybe you’ve even given me something to think about. But when you repeatedly, consistently set up straw men to deflect attention from the salient matters, when you ignore all evidence that contradicts you, when you call definitions matters of fact rather than of definition and further insist that yours are the only true ones despite robust, reliable evidence to the contrary, you have shut down any means to converse or resolve anything. And that offends me.
And because it offends me, I will continue to interpret your behavior. Your purpose here is to win, at any price, even if you have to throw the truth under the bus. And that offends me too.
Meanwhile what matters for content is WP:VERIFIABILITY, not your assertions, not your unverifiable credentials, and not your application of conventions contrary to those prevalent in the domain. There is nothing to talk about when your only standard of correctness is yourself. Since there is nothing to talk about, you are not welcome on my talk page. I will delete anything further you post. Strebe (talk) 05:39, 8 March 2013 (UTC)

I won't post anything further on your Talk page, if that is your wish. Be aware that I have placed a request on the Dispute Resolution Noticeboard.184.186.8.148 (talk) 00:28, 9 March 2013 (UTC)

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