![]() ![]() The only prerequisites we need to know are the location of the object and its altitude above ground. ![]() The way of doing it is really straightforward. This is because of the 3D view, which can be visualized by this application and finally brings a user close to the outdoor reality from the specified location. Now, Google Earth seems to give us a more clarified way of doing estimations such as these. For example, this article explains the following matter by analysis of the potential line of sight between two man-made tall constructions. This section is a grateful continuation of the thread about the potential visibility of artificial objects from other artificial objects standing on the ground. APPLICATION FOR LONG-DISTANCE OBSERVATIONS The more detailed stuff will be explained in future articles.ģ. We have quite a lot field of view calculators available on the web, but basic knowledge about units and parameters is required to use them. The following formulas can be stated rather as an outreach to this topic because the aim of a whole chapter is to bring you a general orientation about the relation between the field of view and visual abilities of the given camera lenses. This formula can be applied only in the case when we know the distance to our subject. Then we can use the following formula:ĪTan(x) - Arc tangent as an inverse of the tan trigonometric function,Īlthough just for the linear view considered in our case (as per the table above) we can use the simplified form of the aforementioned approach: The problem becomes when we are going to use the lens combination. We just need to know the angle of view, focal length, and camera-to-subject distance. The table also doesn’t include the fish-eye image circumstances.Ĭalculation of the FOV by using the lens with a fixed magnification is an easy thing. Apart from that, we could specify the field of view also with horizontal and diagonal sense as well as the DX sensor, which is smaller. Moreover, it refers to the FX Full frame format sensor (36x24mm). This data is far simplified because only the horizontal FOV has been taken into account. The primary difference between them is the angular size of the view we can get around the targeted object (Pic. The field of view changes in Google Earth is limited to the range between 10º and 300º. Along with the application of the FOV angle in Google, it’s advisable to turn on the photorealistic atmosphere mode in order to get the view as similar as possible to real outdoor conditions. It’s just a digression, which could imply to any user the potential flexibility of FOV value in Google Earth without any knowledge. The horizontal field of view (HFOV) in Google Earth of about 60º is said to be used whereas the same HFOV for Google Maps utilizes 35º for its Earth View. The field of view varies slightly between Google Earth and Google Maps due to different default values set. Continuing this way of thinking, there are important elements comprising the field of vision such as aspect ratio and especially rendering resolution. However, in the case of Google Earth and similar applications, the field of view issue should be considered also as the field of vision applied in the gaming world, where a user can see the scene displayed at a given moment. In the case of astronomy or photography, we should treat the field of view as the angular area viewed by the instrument, which represents a part of the sky or the world visible at a particular position and orientation in space. kml file The field of view is explained as “the extent of the observable world that is seen at any given moment”. the value is added automatically when the tour is recorded, but it can be also added manually to the. In fact, it applies just to the tour mode but eventually can be also translated to the standard view, and indeed it will be also discussed in this paper. The FOV feature has been introduced to Google Earth along with version 6.1. That’s exactly the case raised here, although other configurations will be also discussed. Because the option is to be considered in the aspect of the long-distance observations, it’s indeed a continuation of the thread about the estimation of visibility between two artificial objects. This article presents a nice feature in Google Earth, which lets on getting a telephoto view rendered from any location around the globe.
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