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I notice the Field of View (FOV) degree per street view zoom level is different between browsers

I believe the documented street view zoom level to FOV is 

0: 180, 1: 90, 2: 45, 3: 22.5, 4: 11:25

I am using the v3 Maps API with street view panorama and get zoom levels to FOV in chrome around 

0: 127, 1: 90, 2: 53, 3: 28, 4: 14

These zoom to FOV are the same in IE7 and IE8

in Firefox and IE6 they are:

0: 180, 1: 90, 2: 45, 3: 22.5, 4: 11:25
  • Is this documented?
  • How can I enforce the street view FOV consistently across browsers or calculate the FOV value for that zoom level?
user1268415
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  • Checking the Maps API will probably be a good way to answer the first question. Did you try doing this? – Rafał Rawicki Mar 20 '12 at 20:38
  • thanks - yes I checked the API documentation here: https://developers.google.com/maps/documentation/javascript/streetview but it only details zoom level at 0:180, 1:90, 2:45 when I view via chrome or IE8 I get zoom level at 0:127, 1:90, 2:53 but can't see these values documented anywhere – user1268415 Mar 22 '12 at 07:54

5 Answers5

5

Currently, there is a table here relating zoom and FOV that says:

0=>180 1=>90 2=>45 3=>22.5 4=>11.5

You can convert from zoom to FOV in javascript like this:

var fov = 180 / Math.pow(2,zoom);

Fernando Fabreti
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the issue is with when the maps api supports the use of CANVAS with the specific browser

Maps API version 3.7 January 24, 2012 included Enabled Canvas Street View on IE 9, Opera and Safari/Windows

using maps api 3.6 that doesn't support canvas in maps ( except chrome browser ) you get the FOV as 0: 180, 1: 90, 2: 45, 3: 22.5, 4: 11:25

any streetview loaded within a maps supported canvas get FOV as 0: 127, 1: 90, 2: 53, 3: 28, 4: 14

user1268415
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It is not direct answer to a question, but maybe it helps:

There is undocumented option of google.maps.StreetViewPanorama class named 'mode'. You will be able to force rendering mode, and FOV should be the same for eg. 'html5'

Google Maps API custom Street View quality issue

Community
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Michal Schwarz
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Since this seems to be the first result on google, for anyone interested, you can use the formula

Math.atan(Math.pow(2, 1 - zoom)) * 360 / Math.PI

to get the zoom levels

0: 127, 1: 90, 2: 53, 3: 28, 4: 14

I couldn't find this anywhere in the documentation, but it fits the data perfectly and looks like the math for a cylindrical projection.

Matt
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I can't find the solution other than to use 90 degree FOV which is consistent at zoom 1 for all browsers that I have tested

user1268415
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