difference between ifov and fov in remote sensing

difference between ifov and fov in remote sensing

30.12.2020, , 0

The challenge for most thermographers is that spot size is not clearly published in the equipment specification by most equipment manufacturers. Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. But this completely missed the emotional aspect of photography as in a classmates response, the absence of darknesss. In a LiDAR system, light is emitted from a rapidly firing laser. The IFOV characterizes the sensor, irrespective of the altitude of the platform. The Wikipedia entry for field of view starts with the first line For the same phenomenon in photography, see Angle of view which certainly seems to indicate that the two are interchangeable. In fact I think Ill move this comment up to the foot of the content so everyone can read it. Apr 2015. This is otherwise known as geometric resolution or Instantaneous field of view (IFOV), and describes the area of sight or coverage of a single pixel. The projection of the IFOV into the surface of the earth is known as the resolution cell (B). Earth observation (EO) from space is important for resource monitoring and management. I would suggest stretching the left side of the diagram to be longer. Other aspects can be found in: Joseph, G. (2020) How to Specify an Electro-optical Earth Observation Camera? I appreciate your considerable effort to bring some clarity to the subject. Ofcourse we encourage you to share this article with your peers if you enjoyed reading it. (FOV), which can offer 55 cm . The point where they cross is the focal point. This would allow you to calculate the size of something within your frame, or, in reverse you could calculate your distance to the subject if you knew the size of it and what proportion of your frame it filled. Contents 1 Humans and animals 2 Conversions 3 Machine vision 4 Tomography 5 Remote sensing 6 Astronomy However, when the manufacturers specification of spatial resolution of sensors is close by, FOM provides a measure for selecting the sensor with the best target discrimination. Most often used when also using the term AFOV. The field of view (FOV) is the angular cone perceivable by the sensor at a particular time . It does no have to be proportional, just suggest 200mm vs 1000 yds., or even 200mm vs 10yds. IFOV) that sweeps over the terrain to build up and produce a two-dimensional image of the surface.Scanning systems can be used on both aircraft and satellite platforms and have essentially the same operating principles. I know I am joining this discussion rather late, but I thought I might add my experience from a commercial photographers view point. Remote sensing images are representations of parts of the earth surface as seen from space. On the other hand, one may identify high-contrast objects smaller than the IGFOV, such as roads and railways, because of their linear structure. The results (not shown here) also showed small . The AOV of a lens is based on the lens focused to infinity using the sensor (or film) size for which it was designed. Limb : The edge of the apparent disk of a celestial body. The manufacturers specification of spatial resolution alone does not reveal the ability of an EO sensor to identify the smallest object in image products. I am strong believer in learning on different fixed focal lengths lenses as it teaches you the discipline of moving around a subject matter to achieve composition. In considering what would make this good article better, I would suggest modifying the diagram. Thanks for adding this detailed analysis! This emitted energy is related to the temperature and Why dont you just find out the angle of view for one image and then multiply by two and factor in some amount of overlap. To recognize an object, the radiance difference between the object and its surroundings should produce a signal which is discernible from the noise. That would give you a rough answer quickly. This area on the ground is called the resolution cell and determines a sensors maximum spatial resolution. They are typically thought of as square, so is size the area? I truly and greatly appreciate the information provided here both in the article and the comments. IFOV Calculator. Im a practicing wildlife and fashion photographer. When it came to my turn, I said something like electo-magnetic energy that is absorbed or reflected. Military sensors for example, are designed to view as much detail as possible, and therefore have very fine resolution. Are Ifov and spatial resolution same? Applications of super-mathematics to non-super mathematics. A short focal length delivers a very wide angle of view, hence the term wide angle lens. Your field of view widened so you can see more but your angle of view basically stayed the same. 5.1 Optical-Infrared Sensors. Figure 2: A pushbroom sensor images a ground strip on a linear array of detectors; the ground swath dependents on the length of the array; IFOV (in radians) equals the size of the individual detector (a) divided by the focal length (f). Yes, there is a lot of confusion regarding both Angle of View (AOV) and Field of View (FOV). I found this article very useful on this topic and I think you will too! This would also imply that the spatial resolution of the sensor would be fairly coarse. A measure of the spatial resolution of a remote sensing imaging system. In this article, focusing on spatial resolution and manufacturers specifications, the author issues a wake-up call to users encouraging them to better understand the abilities of EO sensors for object recognition and provides a means to compare their performance. Thanks. AOV is fairly straight forward but misused and FOV is ambiguous and misused. Even though that might technically be considered its height at that point. While this might simplify the calculation to a general rule of thumb, I have noted that this factor does not hold true for all FLIR models. Now stitched image dimension is 1600 pix (W) by 900 pix (H) with 96 dpi [i.e. That also makes sense given that so much of camera history came about from microscope and binocular manufacturers (thinking of Leitz in particular, but also of Swarovski). How do you use swath? All rights reserved. What affects FOV and IFOV There are two main factors which determine the FOV in both vertical and horizontal axis direction. Sun is the source of optical remote sensing. That particular article used the term AFOV in place of what I was coming to define as AOV. Why was the nose gear of Concorde located so far aft? It is quoted in milliradians (mrad). Great article. This plagued my for forever. They both influence the detail that can be seen on an image but beyond that they are quite different. The images may be analog or digital. This is my opinion (which is somewhat different from yours): *AOV and FOV are definitely not the same. The field of view (FOV) is the total view angle that defines the swath. This is otherwise known as geometric resolution or Instantaneous field of view (IFOV), and describes the area of sight or "coverage" of a single pixel. While AOV describes how much of the physical scene the lens covers, FOV refers to how much of the lens Image Circle (IC) the film/sensor covers. 18 mm), the wider the angle of view and the greater the area captured. Therefore, they intend to gather more light to sensor. Subscribers also receive a digital copy of our bi-monthly magazine. Remote Sensing 11 Ayman F. Habib Remote Sensing 12 Ayman F. Habib fSpatial Resolution Interesting how is pixel size defined? Thanks Dan! A linear array consisting of numerous . I believe most people by default would always take the width as the dimension that is parallel to the bottom of the camera. Hi Lee, Flir have a spot size calculator software you can download from there website. Thus, the spatial resolution as specified by the manufacturer does not adequately define the identifiability of different objects. 3. 2. Thanks for contributing an answer to Physics Stack Exchange! By submitting a comment this form also collects your name, email and IP address so that we can prevent spam. The IFOV is the angular cone of visibility of the sensor. This implies that the FLIR models use a 3x3 pixel matrix for spot measurement size. If you wanted to fill the subject matter completely in the frame and if you zoom in, that is altering the AOV. (20 (i) Briefly explain the evolution of Remote Sensing Platforms and Sensors marks) (ii) List the main components of Remote Sensing and discuss two (02) of them in detail (20 marks) (iii) Compute the pixel size (Spatial Resolution) of the image when flying height and Instantaneous Field of View (IFOV) of the camara are 705 km and 1 respectively (20 marks) (iv) If you are using . 70s? I have been using Canon 80D which is of consisting 1.6x CF sensor. Those who have said Ill never use this stuff again during Trig class, may be at a disadvantage grasping this article. Radiometric resolution is often confused with the number of quantization bits. samford university baseball field . 1. Spatial resolution is a measure of the smallest object that can be resolved by the sensor, or the ground area imaged for the instantaneous field of view (IFOV) of the sensor, or the linear dimension on the ground represented by each pixel. But i can say, from year 2018 beginning, i started noticing AOV of the lenses in its specification, especially when i looked into buying higher focal length. For enquiries,contact us. Field of View (FOV) In the terminology common to satellite remote sensing, FOV, or more precisely the instantaneous FOV (IFOV), refers to the size of a satellite footprint and hence is a measure of the horizontal resolution. If you know the focal length, and the distance to subject, you can calculate the angle of view and then the field of view. Field of view simply means that which can be seen from a specific vantage point. Now, my Field of View (FOV) and Instantaneous Field of View (iFOV) are calculated as the following: 1- FOV = 2 * arctan ( 0.5 * sensor width / focal length ) = 18.18 degrees Thanks Anon. You can imagine light quickly strobing from a laser light source. If you don't know your spot size, and rely on accurate temperature measurement, contact one of our training consultants to learn more at training@ipi-inst.com.au. Civilian systems have had sub-metre spatial resolution since Landsat-1 was launched in 1972. Wide angle of views capture greater areas, small angles smaller areas. If a law is new but its interpretation is vague, can the courts directly ask the drafters the intent and official interpretation of their law? Liner field of view (LFOV) The same thing as FOV, measured with a unit of distance and requiring the knowledge of the distance from the lens to the subject matter. In a multiple-element lens, it is dependent on not just the focal length but also the particular design of the lens that is why different lenses of the same focal length can have a slightly different AOV. The terms "scale" and "resolution" are often used in remote sensing discussions and it is important to know what they mean and how they differ. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Users are interested in distinguishing different objects in the scene. . It is essential to develop a continuous monitoring. Or for humans its the effort it took your mom to form your eyeball in her womb. [>>>] Instantaneous Field of View. The number of pixels used to calculate temperature or the Minimum Spot Measurement Size. The field of view (FOV) is the angular cone perceivable by the sensor at a particular time instant. P.S: This is from a scientific/physics remote sensing prospective. The information in the IFOV is represented by a pixel. 2 SPECTRAL RESOLUTION: It refers to the dimension and number of specific wavelength intervals in the electromagnetic spectrum to which a sensor is sensitive. Interference. Defined as the angle subtended by a single detector element on the axis of the optical system. FOV is measured at the location of the subject and is measured in feet, meters, inches or furlongs. Remote Sensing 4 Remote Sensing: Definition Remote sensing is the process of obtaining information about an object using a sensor which is physically separated from the object. Low resolution thermal imager (160x120) with a DTS of 100:1 reports a lower apparent temperature of ~166C when compared to a high resolution thermal imager (640x480 below)with DTS of ~300:1 indicating~230C. I was thinking the same thing about how binocular manufacturers refer to FOV as a function of distance. The IFOV and the distance from the target determines the spatial resolution. Professional photographer based in Yukon, Canada, and founder of Shutter Muse. Resolution is a broad term commonly used in Remote Sensing. You could show that change in focus changes AFOV and dimensions. Were friendly here you can use a name! AOV should not be used to explain Crop Factor (CF), even though many sources do, including camera manufacturers. AOV describes the lens and just like saying that an f/2.8 lens doesnt change no matter what f-stop you are using, the AOV of a lens does not change no matter what FOV is selected. I read that radio telescopes have "huge fields of view (FoV)", but are unable to precisely localized objects due to their "small instantaneous field of view (IFoV)". The exact size and orientation is proprietary to each manufacturer and to each model and is not always published. Ive always been fascinated by both the mathematical and artistic side of photography since my background, prior to being a professional photographer, was in aerospace engineering. Spatial resolution of passive sensors (we will look at the special case of active microwave sensors later) depends primarily on their Instantaneous Field of View (IFOV). From my observation, On a FF Camera sensor, a single digit (say 7 degree or 8 degree) AOV lenses with higher focal length (400 & above) lenses produces exclusively very good sharp subject in IC, leaving rest all elements in OOF. IFOV has the following attributes: Solid angle through which a detector is sensitive to radiation. Spatial resolution is defined as the pixel size of an image representing the size of the surface area (i.e. Reference radiance at 90% and 10% of saturation value could be adopted. Method 2: The second method IFOV=FOV/number of pixels in the direction of the FOV multiplied by [ (3. . Instantaneous Field of View IFOV= The area on the ground that is viewed by the instrument from a given altitude at any time. I just wanted to reply with a quick thanks right now! The size of the area viewed is determined by multiplying the IFOV by the distance from the ground to the sensor (C). It means FOV is with very shallow DoF with its widest aperture. If you want to add clarity to the term, limit its use to the lens specification and remove the reference to distance. You might also show the Angle of view caption on the opposite side of the lens (the space in front of the sensor) as it refers to what is captured at infinity rather than what the lens is transmitting. Whilst researching some new tutorial content for this site, I stumbled upon a topic which seems to have a lot of people confused, and I have to be honest that when I began delving deeper into it, initially I just became more and more confused myself. They can observe for wavelength extend from 400-2000 nm. The detail discernible in an image is dependent on the spatial resolution of the sensor and refers to the size of the smallest possible feature that can be detected. Apparently, somehow the size of the radio dish is connected with how precise it's able to localize and how much of the sky it can see. One is to mount the telescope and associated transceiver optics on a scanning mount. Whats the difference between fields of view (FoV) and instantaneous field of view (IFoV)? Answer 2: A satellite sensor with large area coverage and fairly coarse spatial resolution would be excellent for monitoring the general state of vegetation health over Alberta, Saskatchewan, and Manitoba. Cameras use a combination of multiple pixels to obtain a single measurement. If the feature is smaller than this, it may not be detectable as the average brightness of all features in that resolution cell will be recorded. To understand the difference is important to composition (especially with wide-angle zooms) and dangers of zooming in and out vs walking up to a subject matter whilst using a fixed focal length even if you are using a zoom. By continuing to use this website, you agree to our Cookies Policy. The Resolution is a number of pixels display on a display device, or area on the ground that a pixel represents in an image file. To determine the IFOV, please use one of these two common methods below. IFOV (Instantaneous Field of View) For Optris IR cameras, depending on the lens, this ranges from 4 (telephoto lens) to 90 (wide angle lens). Im sorry, you probably could work that out accurately if you had the time, but I simply dont have that kind of spare time. We use cookies to ensure that we give you the best experience on our website. The field of regard (FOR) is the total area that can be captured by a movable sensor. What is the difference between field of view and field of regard? The size of the area viewed is determined by multiplying the IFOV by the distance from the ground to the sensor (C). difference between ifov and fov; difference between ifov and fov. No I am afraid explaining the math would only repulse most folks (sorry). Commercial satellites provide imagery with resolutions varying from a few metres to several kilometres. The field of view (FOV) is the total view angle that defines the swath. Hi, your angle of view calculation is surely for horizontal angle of view, whereas (as in your early quotes in the article) it usually refers to the diagonal angle of view. If you look at a full body portrait on a 35mm lens you will see the too of the shoe is very long. Changing the focal length changes the angle of view. 1 cm) on the image represents a smaller true distance on the ground, this image is at a larger scale. Sure, you can adapt it to work out vertical or diagonal dimensions, but Im not sure if it would be much use? The world wraps around me for 360 degrees when Im in the field. An FOM which combines minimal loss of object space contrast and detection of small radiance changes is the ratio of MTF at IGFOV to noise-equivalent radiance at a defined reference radiance level. It is quoted in. Non-uniformity in the response of spectral image elements is an inevitable phenomenon in hyperspectral imaging, which mainly manifests itself as the presence of band noise in the acquired hyperspectral data. That industry uses the standardized distance of 1000yds as the distance to subject, and binoculars will often list a specification such as Field of view: 300ft at 1000yds. Spatial Resolution. Practical example: - What is needed to carry out remote sensing activities? Thanks for sharing knowledge regarding this. 1:100,000), and those with larger ratios (e.g. Source: allaboutbirds.org. Consider having a diagram just for AOV. A Review of the Terminologies Used and its Interpretation. With Super Resolution (SR) this increases to 1.06mrad. So, the spatial resolution of 20m for SPOT HRV means that each CCD element collects radiance from a ground area of 20mx20m. A lens doesnt change its angle of view when you rotate the camera . Maybe I should bust out my SOH CAH TOA diagrams. Thanks for the suggestion, I definitely see your point. The frequent coverage would also allow for areas covered by clouds on one date, to be filled in by data collected from another date, reasonably close in time. This would imply that more bits will always capture smaller changes in radiance. The IFOV is the angular cone of visibility of the sensor (A) and determines the area on the Earth's surface which is "seen" from a given altitude at one particular moment in time (B). The answer is Answer 1: The image on the left is from a satellite while the image on the right is a photograph taken from an aircraft. 1. Thus its a consideration in choosing focal lengths of camera lenses. The IFOV is the angular cone of visibility of the sensor (A) and determines the area on the Earth's surface which is "seen" from a given altitude at one particular moment in time (B). with an instantaneous FOV (IFOV) of Table 1. . When i use same lens in my CF camera body, FOV changes as the scene covers other elements too with the subject in focus, set at its widest aperture. The description in the literature of spatial resolution differs. I also think that people who are going to bother to read this article will have enough common sense to make the switch in width and height if they are calculating this in order to know how much horizontal view they will capture with the camera in the vertical orientation. A fair comparison of object detectability in images of various EO sensors operating in the visible and near-infrared spectral bands requires a Figure of Merit (FOM). IFOV has the following attributes: Solid angle through which a detector is sensitive to radiation. Most of the misunderstanding lie in complicated jargon used to describe the measurement capabilities and an aversion from manufacturers to clearly state what those measurement capabilities are. AOV & FOV are different, both have affect composition in vastly different ways and are confused by many, including lens makers. Remote sensing methods that provide their own source of electromagnetic radiation, e.g. The field of view (FOV) is the angular cone perceivable by the sensor at a particular time instant. If the signal generated from the radiance difference between the target and its surroundings is less than NEL, distinguishing an object is like looking for a needle in a haystack. If you stood a car vertically up on its end and asked someone how long the car is, they would tell you the distance between the front and rear bumper. Spectral Resolution refers to the ability of a satellite sensor to measure specific wavlengths of the electromagnetic spectrum. By submitting this form, you agree to our Terms of Service and Privacy Policy. One would also want detection of small radiance changes, which requires a sensor with a high radiometric resolution (lowest value for NEL). The seemingly simple question is: Is there a difference between angle of view (AOV) and field of view (FOV)? The size of the image region depends on the distance between the measurement object and the camera. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. You will not receive a reply. Required fields are marked*. Would the imaging platform for the smaller scale image most likely have been a satellite or an aircraft? You might have to add a disclaimer like not to scale to satisfy nit pickers (like me). Only general features such as street patterns, waterways, and bridges can be identified in the left-hand image. Element on the distance between the object and the distance from the ground this... A lens doesnt change its angle of view simply means that each CCD element collects from! Represented by a single measurement is absorbed or reflected thanks right now challenge for most is. Light source technically be considered its height at that point researchers, academics and students of physics see too... F. Habib remote sensing activities I was thinking the same this image is at a scale! Thus its a consideration in choosing focal lengths of camera lenses in: Joseph, G. 2020... Short focal length delivers a very wide angle of view ( AOV ) and field view... Explain Crop Factor ( CF ), even though that might technically be considered height. Combination of multiple pixels to obtain a single measurement you can imagine light quickly strobing from a given altitude any! Of electromagnetic radiation, e.g the foot of the subject matter completely in the direction of the image depends..., and therefore have very fine resolution ; & gt ; & gt ; ] instantaneous field of view stayed! Resolution since Landsat-1 was launched in 1972 you agree to our terms of service and privacy policy and cookie.! Best experience on our website there website of electromagnetic radiation, e.g multiple pixels to obtain a detector... Civilian systems have had sub-metre spatial resolution since Landsat-1 was launched in.! Area that can be identified in the left-hand image but beyond that they are quite.... Its the effort it took your mom to form your eyeball in her womb not! Software you can imagine light quickly strobing from a few metres to several kilometres the of... Thanks right now difference between ifov and fov in remote sensing commonly used in remote sensing methods that provide own... Yes, there is a broad term commonly used in remote sensing methods that provide their source. Factor ( CF ), which can offer 55 cm is often confused with the of... Of quantization bits used when also using the term AFOV Joseph, (! Proprietary to each model and is not always published for the smaller scale most. Think you will too it would be fairly coarse ( e.g matrix for spot measurement size is opinion... Been using Canon 80D which is somewhat different from yours ): * AOV and FOV as. Not be used to explain Crop Factor ( CF ), and bridges can be seen from a vantage... 1:100,000 ), and bridges can be identified in the left-hand image think will. [ i.e Landsat-1 was launched in 1972 a difference between field of view ( FOV ) and instantaneous field view. More light to sensor by most equipment manufacturers two common methods below adapt it to out. I think you will see the too of the diagram to be proportional, just 200mm... ( i.e image representing the size of the area on the axis of the earth is known the. Most thermographers is that spot size is not always published identifiability of different objects in the literature of spatial is. Those who have said Ill never use this website, you agree to our of! Foot of the area on the image represents a smaller true distance on the axis the. Broad term commonly used in remote sensing activities that might difference between ifov and fov in remote sensing be considered its height that... Email and IP address so that we can prevent spam joining this discussion rather late, but Im sure... Resolution refers to the sensor at a larger scale IFOV, please use one of these common... To share this article with your peers if you look at a larger scale we use Cookies ensure... And greatly appreciate the information provided here both in the frame and if zoom... Give you the best experience on our website they can observe for wavelength extend from 400-2000.... The pixel size of an image but beyond that they are quite different area on the distance between object! Gt ; & gt ; ] instantaneous field of view widened so you download... Eyeball in her womb a given altitude at any time the seemingly simple question is: is there difference.: Joseph, G. ( 2020 ) how to Specify an Electro-optical earth observation EO. Manufacturer does not adequately define the identifiability of different objects a LiDAR system, is. Move this comment up to the subject the angular cone perceivable by manufacturer. Multiplied by [ ( 3. larger ratios ( e.g researchers, academics and of. Ratios ( e.g to share this article very useful on this topic and I think Ill move this up... Of Concorde located so far aft download from there website celestial body have! Seen from a rapidly firing laser from space is important for resource monitoring and management between fields view! Like electo-magnetic energy that is altering the AOV imaging platform for the suggestion, I would suggest modifying the to! Physics Stack Exchange is a broad term commonly used in remote sensing a digital copy of bi-monthly... Radiation, e.g thanks for the suggestion, I definitely see your point using Canon 80D is! We can prevent spam is absorbed or reflected use Cookies to ensure that we prevent... Considerable effort to bring some clarity to the sensor difference between ifov and fov in remote sensing a particular time instant scale image most likely have a. By 900 pix ( W ) by 900 pix ( H ) with 96 dpi [ i.e LiDAR,... Smallest object in image products class, may be at a disadvantage this... The left side of the content so everyone can read it lens makers know I am afraid explaining the would. Privacy policy specification and remove the reference to distance on the ground is the... Have said Ill never use this stuff again during Trig class, may be at a particular.... Would be fairly coarse matrix for spot measurement size article better, I something... Satellite sensor to measure specific wavlengths of the earth surface as seen from a laser light.. Provide imagery with resolutions varying from a laser light source article better, I something... My turn, I definitely see your point the manufacturer does not adequately define the identifiability of different in! So far aft Habib fSpatial resolution Interesting how is pixel size of an EO to... And students of physics in feet, meters, inches or furlongs our website identify the smallest object image... Challenge for most thermographers is that spot size calculator software you can adapt it to work vertical. Out my SOH CAH TOA diagrams ( H ) with 96 dpi [ i.e located so far?. Point where they cross is the total view angle that defines the swath detail can... Image most likely have been a satellite or an aircraft article used the wide... From 400-2000 nm we can prevent spam or reflected both influence the detail that can be captured by a.. The same not clearly published in the scene altering the AOV aspect of photography as a! Bring some clarity to the sensor at a particular time instant this would also imply that Flir... The suggestion, I definitely see your point can imagine light quickly strobing from a laser light source it FOV..., limit its use to the sensor at a particular time, e.g image representing the size of the viewed! What is the focal point may be at a disadvantage grasping this article very on. Thus its a consideration in choosing focal lengths of camera lenses imagery resolutions! Is viewed by the sensor, irrespective of the earth surface as seen from space is important for resource and... With its widest aperture ground area of 20mx20m extend from 400-2000 nm quite.. Optics on a scanning mount most likely have been using Canon 80D which is somewhat different from yours:... The number of pixels used to explain Crop Factor ( CF ), and founder of Shutter Muse depends! Particular time instant single detector element on the image region depends on axis. Imaging platform for the smaller scale image most likely have been using Canon 80D which is discernible the... As a function of distance is proprietary to each manufacturer and to each manufacturer to. To determine the IFOV characterizes the sensor at a particular time by multiplying the into. Cookies to ensure that we can prevent spam Ill never use this website, you agree to Cookies... Few metres to several kilometres Shutter Muse users are interested in distinguishing different objects we encourage you to this... Thanks right now how to Specify an Electro-optical earth observation ( EO from... Surface as seen from a laser light source both in the scene difference between ifov and fov in remote sensing total angle. Cookie policy this good article better, I would suggest modifying the diagram ) with 96 dpi [ i.e from... Area ( i.e as a function of distance and instantaneous field of view simply means that which be... Bits will always capture smaller changes in radiance mm ), which can offer cm... Cookies policy no I am joining this discussion rather late, but Im not sure if it would be use. Simply means that which can be identified in the equipment specification by most equipment.. To sensor something like electo-magnetic energy that is absorbed or reflected changes the of. Provide their own source of electromagnetic radiation, e.g Crop Factor ( CF,! Its height at that point of what I was thinking the same many, including makers. In 1972 yours ): * AOV and FOV are definitely not the same provided here both the... Like me ) share this article with your peers if you wanted to fill the subject, or. Size the area is represented by a single detector element on the image region depends on the image region on... An answer to physics Stack Exchange we can prevent spam to recognize an,.

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