Talk:Lidar

message: Is LADAR the correct term here - or should it be LIDAR?  Perhaps with a sub heading for Ladar.  
* Ladar also seems to have a lot of eye surgery references as there is a tradenamed procedure that begins with Ladar.
* Also see Ladar which cross references to Lidar, as a more general term.
* A google search for Ladar gives 9,160 entries, while a google search for Lidar gives 296,000.   
Lidar is linked to Ladar in Wikipedia.  I think it should be the other way around, or there should be two entries.   Also should these terms be capitalised? They are spelt as Ladar and Lidar in many internet entries. Any thoughts? kiwiinapanic 09:59, 17 Dec 2003 (UTC)
replies: text: I'm with you on this. I originally created this as an offshoot of RADAR and have since learned that it's much more common to refer to it as LIDAR. Feel free to move it! Maury 13:19, 17 Dec 2003 (UTC)

text: Lidar is the more general term. The distinction between lidar and ladar depends more on the nature of the target. Traditionally lidar has been used to refer to diffuse targets (eg atmospheric aerosols) while ladar has been used to refer to hard (ie solid) targets. In the early 90s there was a letter submitted to Photonics Spectra (IIRC) that discussed the subtleties of this issue. Personally I tend to use the term laser remote sensing these days as not all of the instruments I develop in my professional life provide range information and lidar is therefore a subset of laser remote sensing. There are a number of implicit assumptions built into the information currently conveyed on the page that are not always correct. I will think about how to correct these with minimal editing changes but do not have time at the moment. --Gary Spiers - www.lidar.com — Preceding unsigned comment added by 66.159.192.247 (talk) 05:16, 28 April 2004 (UTC)
thread_title:  Article name 

message: Can anyone tell me what some of the pros & cons are of using a polygon mirror? — Preceding unsigned comment added by 209.247.234.99 (talk) 15:13, 13 April 2004 (UTC)
thread_title:  Mirror choice 

message: LADAR stands for LASER Detection and Ranging. LASER stands for Light Amplification by Stimulated Emission of Radiation. If you string the whole thing together, you get "Light Amplification by Stimulated Emission of Radiation, Detection, and Ranging." How do you emit detection and ranging? Same thing goes for LIDAR, except it emits imaging too. — Daniel 01:34, 21 December 2005 (UTC)
replies: text: LASER in the name simply refers to the device which emits a coherent beam of light. LIDAR is simply Detection, Ranging and Imaging through the use of a scanning laser. Trying to work the LASER acronym open inside the LIDAR acronym is unnecessary. — Preceding unsigned comment added by 142.167.179.232 (talk) 10:32, 20 March 2006 (UTC)

text: I dimly recall that it was an acronym of Laser Interferometry Detection And Ranging. It was probably in a journal or newspaper. Or perhaps on Tomorrow's World, a BBCtv science-magazine program. It is an uncertain memory. Archolman (talk) 21:22, 9 August 2013 (UTC)
thread_title:  Acronym 

message: The following article (abstract) by the National Institute of Standards and Technology would provide some good background information to help with a cleanup of this section.
:Performance Analysis of Next-Generation LADAR ... NISTIR 7117; 198 p. May 2004 (9 MB)
—Preceding unsigned comment added by Flyingpolarbear (talk • contribs) 19:33, 17 March 2006 (UTC)
thread_title:  A resource 

message: 1550s aren't all that rare nowadays. I'm not really sure I buy the rep rate comment either. Maybe that's true for power, but if you needed a lot of power you'd be using a YAG anyway - right? - not a 600-800 diode. 600-800 isn't a very good range limit spec either if this is supposed to imply "conventional III-V edge-emitting diode" - 904 nm LIDARs are common as dirt. Is this section from an outdated source perhaps? Tarchon (talk) 21:25, 10 April 2006 (UTC)
thread_title:  Laser sources 

message: All kinds of systems and applications use the term LIDAR. Not all LIDARs are based on lasers or pulses. And the distance measurement is only one of the measured parameters. I suggest the following more general introduction.
I am also working on a short general principle section. Which could be followed by the following applications section suggestion:
and finally a more detailed principle description of the different subsections.
— Preceding unsigned comment added by 130.225.79.64 (talk) 14:18, 12 April 2006 (UTC)
replies: text: I agree about generalizing it. Restricting LIDAR to pulsed laser techniques is just incorrect. It might be better to describe that as the way LIDAR is usually done. I'm never quite sure where LIDAR ends and profiling begins though. I'd mention the disadvantages compared to RADAR too, not just the advantages. Short wavelengths also imply more scattering, less range, for example. Tarchon (talk) 00:50, 18 April 2006 (UTC)
thread_title:  A more general introduction, and more 

message: Does anybody know if lidar and radar were fixed on the same target from roughly the same place if they could mess with each other? — Preceding unsigned comment added by 69.156.43.137 (talk) 04:53, 2 June 2006
:I can assure you that lidar (visible or near infrared light) and radar (microvawe range) use wavelengths differing by several orders of magnitude. Therefore no interference is possible. If it were, you would actually see microwave radiation interfering with light inside a microwave oven. It does not happen and intensity of both form of electromagnetic radiation in an oven are much higher than what a radar or lidar use to illuminate a target. Friendly Neighbour 05:49, 2 June 2006 (UTC)
thread_title:  LIDAR and RADAR interfering with one another 

message: The article seems well organized and well written, although a bit technically confusing with all the terms you use. You need to add a reference section for citations sourcing your information. KarenAnn (talk • contribs) 15:21, 6 July 2006 (UTC)
thread_title:  Removed {{Tlx|cleanup}} tag  

message: I think there should be a section listing the different techniques for measuring each parameter such as aerosol type and air temperature. —Preceding unsigned comment added by Cap.fwiffo (talk • contribs) 21:18, 20 August 2006 (UTC)
replies: text: You are free to start one. However the techniques for different aerosol types are identical; the only thing that differs them is the backscattering coefficient for a given particle size / wavelength combination. It's the trace gases that need a different approach. Friendly Neighbour 21:24, 20 August 2006 (UTC)
replies: text: I'm afraid Friendly Neighbour misspoke.  Even for aerosols, there are a number of different measurement techniques that are commonly used.  Simple backscatter lidar (e.g., the spaceborne lidars GLAS and CALIPSO), Raman lidar, and high spectral resolution lidar (HSRL) are all commonly used to measure both cloud and aerosol properties.  For trace gases, differential absorption lidar (DIAL) is the tool of choice...but even DIAL can be (and is) used to make aerosol measurements. Xavier onnasis (talk • contribs) 18:55, 29 December 2006 (UTC)
thread_title:  Lidar measurements and techniques 

message: LIDAR may be used in science fiction as an alternative to RADAR.  I'd add a section but I'm not sure it meets notability requirements, as the only thing I know of for sure that uses it is Space: Above and Beyond. 69.81.123.154 (talk) 18:26, 24 December 2006 (UTC)
thread_title:  ''In fiction'' section? 

message: Hey y'all: I've reverted a previous removal of a KQED-TV (PBS) science story from LIDAR#External links. I didn't get a reply from User:JuJube after requesting clarification for removal. Craigrosa (talk) 18:13, 16 May 2007 (UTC)
replies: text: WP:EL: No link should be added unless its inclusion is justified. Until there is consensus for its inclusion the link should not be reincluded. Femto 12:24, 2 June 2007 (UTC)
thread_title:  Restored link to KQED 

message: This is the only Wikipedia page that has ever slowed down my browser. Is it because of the animated pictures? Running Mac OS X and Firefox. — Preceding unsigned comment added by 76.17.212.193 (talk) 00:51, 21 September 2009 (UTC)
thread_title:  This page slows down my browser 

message: :(Comment moved down from Aren't radio waves light, technically? above, due to the age of that discussion. --83.253.248.109 (talk) 13:49, 20 April 2010 (UTC)
thread_title:  More on the definition of light 

message: A couple of days ago (mid May 2010), several publications were made about how NASA has used LIDAR to survey Caracol, a large Maya city. Could be interesting to mention this and provide suitable links to more information. TobiF (talk) 11:33, 18 May 2010 (UTC)
thread_title:  Perhaps mention survey of Caracol under the ''Archaeology'' heading? 

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message: *Refs - large swathes of text need refs
*Content - complete?
*Reassess
*Check (from feedback footpage): "147.102.195.66 posted feedback to LIDAR3 months ago - The citation missing in "Meteorology and Atmospheric environment" could be: Weitkamp, C. (Ed.), Lidar: Range-Resolved Optical Remote Sensing of the Atmosphere, Series: Springer Series in Optical Sciences, Vol. 102. 2005."
Chaosdruid (talk) 11:12, 24 March 2012 (UTC)
thread_title:  Robotics attention needed 

message: I noted a credit for "on set Lidar scanner" in the recent movie Total Recall. I gather moviemakers are now using LIDAR to scan objects that are going to be represented in CGI? There should be a section on this in the article. 38.111.35.2 (talk) 16:20, 14 August 2012 (UTC)
thread_title:  LIDAR in the film industry 

message: When this article was moved from LADAR to LIDAR to Lidar all mention of LADAR was deleted.  However, at least the USAF continues to use the term LADAR.  The redirect left behind does not explain that LADAR is still in use, even if it is not the more common name.  I believe the etymology section needs to add a mention of this alternative name. --Lineagegeek (talk) 21:35, 17 August 2013 (UTC)
replies: text: Sounds good. I have no objection to your inclusion of a Ladar section. I think you should do it lowercase, since its cognates, laser, lidar, radar, and sonar, have long been lowercase. Edgar Vekilnik, Jr. (talk) 20:39, 18 August 2013 (UTC)
thread_title:  ''LADAR'' Lives. 

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thread_title:  External links modified 

message: Is there a good source that debunks this?  It doesn't seem to want to die otherwise. Andy Dingley (talk) 10:55, 4 October 2015 (UTC)
thread_title:  Did [[Daniel Lidar|Lidar]] invent [[LIDAR]]? 

message: I would like to add a section on lidar use in forestry. Any thoughts? 
Here is a source I would use for reference: 
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.675.3092&rep=rep1&type=pdf
Loganbarrett28 (talk) 04:36, 14 March 2017 (UTC)
thread_title:  Lidar in Forestry section 

message: Putting this on the talk page for future editors. I just went through and changed all (hopefully) the different spellings of lidar, for consistency.  I used the NY Times format of lidar, non-capitalized in any way, unless it's the start of a sentence.  If other groups use LiDAR or LIDAR I left those references alone.  Timtempleton (talk) 23:00, 13 April 2017 (UTC)
thread_title:  Lidar spelling in article 

message: The 3 example papers for "Approaches of processing lidar data" are absolute rubbish. These are papers in third tier conferences and workshops that have absolutely no impact (23/4/10 citations).  The summaries have very low quality and plenty of obvious mistakes. As an example "using Fast R-CNN[53] as this method doesn't need training" is completely false! I suggest to remove all of them or have at most one sentence per method.  — Preceding unsigned comment added by 31.10.144.135 (talk) 12:41, 17 November 2017 (UTC)
thread_title:  Purge autonomous vehicle methods 

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thread_title:  External links modified (January 2018) 

message: The images at the top of the article are really messy and it makes you scroll a good amount before getting to the article.  Should I add a gallery section? Lord David, Duke of Glencoe (talk) 21:08, 6 February 2018 (UTC)
replies: text: It may be the application you're using to view the page. I don't see that problem on my desktop computer. The only thing that stands out is the exceptional width of the table of contents. Try viewing the page on other devices. Eric talk 00:53, 7 February 2018 (UTC)
thread_title:  Images 

message: The picture of the "Uber self-driving car" has someone at the wheel.  Are we sure this is a self-driving car? Morfusmax (talk) 16:22, 9 February 2018 (UTC)
replies: text: The photo in the article as of 2021/03/02 is not an Uber robot car.  The actual, infamous Uber robot car had a safety driver, but she was not paying attention.BBC: Uber's self-driving operator charged over fatal crash Also, the Lidar was not connected to the brakes.  CBC:  Self-driving Uber was aware of pedestrian but didn't stop, probe on fatal Arizona crash findsNTSB: Preliminary Report Highway HWY18MH010 JHowardGibson (talk) 18:39, 2 March 2021 (UTC)
thread_title:  Uber self-driving car? 

message: The first sentence says that lidar is "a surveying method that measures distance to a target by illuminating the target with pulsed laser light and measuring the reflected pulses with a sensor". This scope is too narrow on at least three accounts: 
* First, not all lidars are used to measure distance. Lidar can be used to measure surface reflectivity, atmospheric conditions, and speed. Doppler lidar, for example, measures wind speed by measuring the frequency shift of light that has been backscattered by the air. Differential absorption lidar detects trace amounts of gases by measuring the difference in attenuation of two wavelengths of light, only one of which is absorbed by the target gas. Neither of these examples measures range.
* Second, not all ranging lidars use pulsed light. There are continuous wave lidars, which can be either amplitude- or frequency-modulated at, say, gigahertz frequencies. These can measure range without using pulsed light; instead, they interfere the continuous outgoing signal with the return signal and analyze the beat (wave physics).
* Third, not all lidars are used for surveying. As the article proceeds to mention, it is used in many industries for many applications.
I suggest replacing the first sentence with something like, "Lidar is a type of sensor which obtains information by bouncing light off a target. Such information may include distance to target, direction of the target, reflectance, speed, or atmospheric conditions."
I also think that the article itself needs a huge amount of cleanup. I can probably look into reorganizing a lot of it when I have the time, although I'm working for a lidar manufacturer so it is probably best that someone else does it. For a good technical overview, I recommend the SPIE Field Guide to Lidar. dllu (t,c) 10:18, 9 June 2018 (UTC)
thread_title:  First sentence inaccuracies 

message: I'd enjoy if the history section included a timeline of when each application went into common service, or at least if the application sections included those years.  If others agree this is a good idea, I can go ahead with a rough pass, with citations of course.  Adamw (talk) 07:08, 1 October 2018 (UTC)
thread_title:  More detailed "history" section 

message: No reference given for the claim that Radar is a pronunciation error of raider.  Sounds very suspicions.  Given the article isn't even about Radar, might be best to remove?  — Preceding unsigned comment added by ChrisH256 (talk • contribs) 19:54, 23 April 2019 (UTC)
thread_title:  History and etymology - Radar/Raider claim 

message: I wonder if others might have more information to create a section about Lidar safety conserns.
BBC made an article a while back about a photo-camera being ruined by a car with lidar (https://www.bbc.com/news/technology-46875947), so I wonder if there isn't more.
62.238.252.34 (talk) 09:37, 20 October 2020 (UTC)
replies: text: The safety problem with Lidar is the laser.  Wikipedia has an article on Laser safety which covers most of the problem.  The only issue I can think of as unique to Lidar is that eye‑safe Class 1 lasers are strongly preferred.  On airborne Lidars, the system may be Class 4 at the bottom of the aircraft, and Class 1 at some minimum altitude above the ground.  The aircraft does not activate the Lidar below that altitude, which is not much of a problem because aircraft don't like flying at those low altitudes anyway.  Design practise on Lidars is to use a beam expander to accomplish Class 1 level energy densities.https://www.photonics.com/Articles/Not_All_Beams_Are_Created_Equal/a56477  I know this because I used to work in the industry.  I am searching Google for this stuff, and not finding much. JHowardGibson (talk) 19:34, 23 February 2021 (UTC)
thread_title:  Lidar safety concerns 

message: I’d like more info on how iPhone 12 Pro Max does Lidar. DBGustavson (talk) 20:27, 10 July 2021 (UTC)
thread_title:  iPhone iPad Lidar 

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thread_title:  Featured picture scheduled for POTD 

message: See https://www.sunwindenergy.com/news/lidar-controls-wind-turbine#:~:text=The%20LIDAR%20(light%20detection%20and,before%20it%20reaches%20the%20turbine.
LIDAR in this sense is a related means of measuring wind speed at a distance, using much the same technology. Andrewa (talk) 17:12, 1 June 2022 (UTC)
thread_title:  Wind measurement 

message: There is an older source from 2018 saying that flash LiDAR cannot be done using silicon photonics in an eye-safe range and requires Gallium-Arsenide photonics. Is this still true? It seems like SiLc’s product might make this assumption false by proof by contradiction. I also thought using OPA made silicon photonics viable for flash LiDAR. 
I am not an expert, but would appreciate any experts chipping in to re-examine this source for accuracy. 2603:8080:6001:9C81:0:0:0:1008 (talk) 14:46, 18 February 2023 (UTC)
thread_title:  Requirement of Gallium-Arsenide imagers Still True for Flash LiDAR? 

message: LIDAR was recently incorporated with 3D Printing in Bambu Lab's X1 Carbon. Would this be a worthwhile addition to the article? Trojari (talk) 15:19, 20 March 2023 (UTC)
replies: text: If there are independent reliable sources, perhaps. MrOllie (talk) 15:26, 20 March 2023 (UTC)
thread_title:  Use of LIDAR in Additive Manufacturing 

message: "Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "http://localhost:6011/en.wikipedia.org/v1/":): {\displaystyle d=\frac{c\cdot t}{2}}" Zhamelax (talk) 08:49, 27 September 2023 (UTC)
thread_title:  Error in "Technology/Mathematical formula" section 

message: How do i add a reference to a Wikipedia article on Edward Hutchinson Synge, who did theoretical work on LIDAR in 1930? Wikiijohn (talk) 03:38, 25 January 2024 (UTC)
thread_title:  EH Synge