Talk:Contour line

message: :Yes, at a saddle point. Charles Matthews 08:26, 25 January 2006 (UTC)
replies: text:  Also at a shear cliff the lines will lie on top of each other.  You can have the contours cross completely for multivalued functions.  The geographic equivalent would be an large overhanging piece of rock. The contour corrisponding to the altitude that is the top surface of the rock (or a fraction below it in fact) would follow the edge of the overhang.  The contour for the altitude just above the ground ok? beneath the overhang would go right up to the cliff wall, intersecting the higher one.  This would create a zone (for example) that belonged to both "Above 100m" and "Below 50m" simultaneously, which is of course possible if the ground is at 45m and with an overhang at 105m. —The preceding unsigned comment was added by 195.157.136.194 (talk) 13:52, 17 March 2006 (UTC)
thread_title: contour crossings

message: How did early map makers estimate contour lines?  or put another way, how did they know their level according to sea level? i understand the use of altimeters, but not the practise. —The preceding unsigned comment was added by 86.5.55.199 (talk) 18:34, 13 February 2006 (UTC)
replies: text: answer: see surveying article.--Natcase 04:36, 21 December 2006 (UTC)
thread_title:  question 

message: ok to merge isoline into contour line...no real diff Anlace 14:20, 1 June 2006 (UTC)
replies: text: merger completed ...no content was lost Anlace 08:20, 2 July 2006 (UTC)
thread_title: merger

message: just look how many different applications are served here. that redirect seems appropriate to arrive at this article.Covalent 23:39, 17 September 2006 (UTC)
thread_title: [[Contour map]] should redirect here, not to topo map

message: I suggest merging all (or nearly all) of the "iso-" article stubs into this single article, organized by subject area. I've reorgnized the list of isopleth types as a starter. There are generally references to thematic articles (for example light pollution for isophote), which put the specific example into a good context. I'm putting merge markers on a bunch of them tonight.--Natcase 04:36, 21 December 2006 (UTC)
replies: text: oppose myriad mergers.  this will lead to a very large unwieldy article when the topics are fleshed out. Anlace 05:05, 21 December 2006 (UTC)
replies: text: I revise my suggestion. Some current links go to irrelevant articles (isochrone for example has nothing to do with drive time) and should be delinked. Others are clearly important in their subject areas (isogloss for example), so a more judicious mix of moving stubs here, and referencing full articles, and more disambiguating terms with multiple uses... this could be a bit of a project. My goal, Anlace, is to get rid of the stubs that are essentially Wiktionary entries, and which if fleshed out would largely repeat what should be said generally under "contour lines." See isobar for examples of content that ought to be here.--Natcase 05:10, 21 December 2006 (UTC)
replies: text: This revised intent sounds fine and i support revised merger.  I suppose we can always do a split if someone can create a large article out of one of the merged stubs. regards. Anlace 05:45, 21 December 2006 (UTC)

text: The list of "iso-"s feels a little like the "encyclopedic" lists of names phobias. I like how -phob- handles this, seeing also phobia and specific phobias (though inthis case I don't think we need three articles. I think non-list sections by area of study would help give some sense of context and perspective to the whole. Though I won't place bets on someone with a bent for lists coming in later and resurrecting the lists themselves (maybe that's why we need a separate article for the list). In an encyclopedic sense, I thinks the current list is missing things. Not sure what, but we could probably invent some cool iso's ourselves. Isowiki, for example (lines showing equal density of wikipedia article writers as a  percentage of the general population) —The preceding unsigned comment was added by Natcase (talk • contribs) 05:47, 22 December 2006 (UTC)

text: In 2007, the merge did not include Isoclinic line, Aclinic line, or Isodynamic line.  But these are also no more than dictionary definitions, just like the original Isogon (geomagnetism) article.  I have already included them in Contour line#Magenetism, so all that needs to be done is to change the articles into redirects, so that readers will see the complete family of geomagnetic contour lines.  I think the redirects Magnetic equator and Geomagnetic equator would be best if they went directly to Magnetic dip. JonH (talk) 13:17, 7 March 2010 (UTC)
thread_title: merge

message: So far, all the specificity applies to map applications. Some specific discussion on non-map applications would be welcome. Any suggestions on existing wiki sources to pull from?--Natcase 23:41, 23 January 2007 (UTC)
replies: text: i agree.  i will work on this as i have time. its on my "to do" list.  there are some speciifcs that can be pulled in from noise barrier for example. Anlace 00:33, 24 January 2007 (UTC)
replies: text: Isobars (for constant pressure), isotherms, and other iso-lines are used in graphs in thermodynamics and other science and engineering applications.  They are useful in representing more than two dimensions on a two dimensional graph.  I think some discussion on this would be useful somwhere in Wikipedia.  H Padleckas 00:52, 11 August 2007 (UTC)
thread_title: Specifics on non-map applications?

message: No mention of isohypses in section on meteorology. No mention of constant pressure charts. No met categories either. JMcC 13:20, 3 April 2007 (UTC)
replies: text: For my comments on the use of the word isohypse, see the "merge" section further up this page.  The existing surface weather analysis article is already quite long, but it does not really discuss air pressure.  I think there needs to be a new article that describes how air pressure affects the wind (and it could explain the use of charts that show isobars and isohypses), but I do not know enough about meteorology to write such an article. JonH 13:08, 4 April 2007 (UTC)
replies: text: Perhaps a categorization in 'Meteorology'as well?  —Preceding unsigned comment added by Rajpaj (talk • contribs) 11:36, 21 May 2011 (UTC)
thread_title: Meteorology

message: I have removed the claim that "the Ordnance Survey changes contour lines from brown to grey to indicate bare rock and scree." I use OS maps a lot and have never seen this distinction. At both 1:25000 and 1:50000 scales, contour lines are always brown. Rock and scree are shown using other symbols. However, certain Swiss topo maps do use grey contour lines on rocky ground. It is much clearer IMHO. 143.252.80.100 16:53, 9 May 2007 (UTC)
thread_title:  Line colour 

message: I'd like to add this image to the article. Anyone agree/disagree?-Ravedave 04:10, 15 June 2007 (UTC)
replies: text: Looks like a nice image.  Add it with the proper context somewhere in this article.  H Padleckas 01:02, 11 August 2007 (UTC)
thread_title:  image demoing concept 

message: all comics and manga, all sketch art, flash art, Bizantine art...basically everything, or wait...is this not the appropriate term in american English? --AnY FOUR! 04:38, 27 July 2007 (UTC)
thread_title:  uh and 

message: This article was automatically assessed because at least one WikiProject had rated the article as start, and the rating on other projects was brought up to start class. BetacommandBot 09:46, 10 November 2007 (UTC)
thread_title:  WikiProject class rating

message: How are caves and overhangs "handled"/shown with contour lines? Jackiespeel (talk) 23:00, 7 December 2007 (UTC)
thread_title:  Contour line question

message: I found it a little odd that Isopleth redirects to here (Contour line), while Isopleths is a stub-class article in its own right. Is there any sensible reason why this should be so? --RexxS (talk) 04:02, 4 January 2009 (UTC)
replies: text: merged--Natcase (talk) 13:43, 26 February 2009 (UTC)
thread_title:  Isopleths 

message: Article doesn't mention anything about index contours, be nice to add that somewhere.  —Preceding unsigned comment added by Snazzyy (talk • contribs) 01:40, 10 February 2009 (UTC)
thread_title:  Index Contours 

message: How about adding some travel-time contour maps, e.g. the rather excellent http://www.mysociety.org/2007/more-travel-maps/ Ojw (talk) 17:49, 28 October 2009 (UTC)
thread_title:  Lines of equal travel time 

message: I have incorporated the "Courbe niveau" diagram (shown above under "image demoing concept") into the article.  I have also moved the example of a topographic map further down the article to replace the previous brightly colored relief diagram.
I am not sure what to do about the "Mathematical contour plot" image.  Judging by the vandalism that this article receives, many of its readers are school children, and I fear that instead of seeing contour lines as quite a simple concept (lines joining points of equal value) they will look at the image and give up because they do not understand trigonometric functions.  The image looks interesting, but it is confusing because it emphasizes the colored areas between the contour lines instead of the lines themselves, and it needs the complicated caption just to explain where the function is zero.  Would anyone object if I removed the image? JonH (talk) 15:11, 24 November 2009 (UTC)
thread_title:  Images 

message: But it reads "Mathematical contour plot."  Not all readers are schoolkids; some, say in college math, may profit.
dino (talk) 17:45, 24 November 2009 (UTC)
thread_title: Images

message: Algorithms to draw/find the lines contour plots aught to be notable and mentioned. 82.169.255.79 (talk) 21:14, 15 March 2011 (UTC)
replies: text: Not necessarily. More than likely, these were made with Mathematica. In that program, you simply coodinate your contour plot.  —Preceding unsigned comment added by Rajpaj (talk • contribs) 13:40, 21 May 2011 (UTC)
replies: text:  see level set method - boundaries of level sets are contour lines, equipotential alines are contour lines. Algorithms can be : boundary detection or boundary tracing.--Adam majewski (talk) 09:57, 2 October 2011 (UTC)
thread_title:  Suggestion: contour plot algorithms? 

message: I was directed to this page by User:Opbeith to have a request solved.Can anyone help me.
Can anyone  get close to any climate organisation e.g NASA or others to get climate information on Nigeria containing average rainfall for all nigerian regions and use isohyets or contour lines to contruct the rainfall information of Nigeria for the Geography of Nigeria article and arrange them on the map in the format provided below.                                                                                               
  mm=Millimeters
      
 0 mm   - 500mm
 500mm  - 750mm
 750mm  - 1000mm
 1000mm - 1250mm
 1250mm - 1500mm
 1500mm - 1850mm
 1850mm - 2000mm
 2000mm - 2500mm
 2500mm - 3000mm
 3000mm - 3500mm
 3500mm - 4000mm
 above 4000mm.
 thanks Netknowle message me!  05:05, 13 June 2011 (UTC)
thread_title:  I need help, 

message: Hi. What do you think about dividing this article in 2 : countout line(geographic) and contour line ( math ) ? --Adam majewski (talk) 09:59, 2 October 2011 (UTC)
thread_title:  Contour line(disambiguation)) 

message: When I typed in Isotherm in wikipedia, it directed me to contour lines. While the topics are very similar, and the definition of an Isotherm is adequate, I still think there should be more information on how the concept of an Isotherm was created. Maybe include a historical section mentioning the impact that Alexander Von Humboldt had regarding his studies on the correlation between vegetation and climate, which led to the assimilation of climates and there ecosystems across the globe. Just a thought.
Thanks,
(Mrjohnson007 (talk) 02:34, 11 February 2014 (UTC)
thread_title: Question about the term Isotherm

message: "Isochalaz" only appears in word lists. I can't find it in any journal, or in actual real use anywhere. Equinox ◑ 03:51, 20 November 2016 (UTC)
thread_title:  Is "isochalaz" a hoax? 

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thread_title:  External links modified 

message: How can we Count Those Lines Simbo Mpharanyana (talk) 07:29, 15 April 2021 (UTC)
thread_title:  Contour Lines