Google Map Api Zoom Level

[Sourabh Doherty]

Makesure your calculator is in degrees mode, unless you want to express latitude in radians for some reason. C should be expressed in whatever scale unit you're interested in (miles, meters, feet, smoots, whatever).

This formula assumes that the Earth is perfectly spheric, but since the Earth is actually ellipsoidal there will be a slight error in this calculation, which does not take into account the flattening (with a slight reduction of radius for the best-fitting sphere passing at geographic poles at average sea level). But this error is very slight: it is null on the reference Equator, then grows to an absolute maximum of 0.3% at median latitudes, then shrinks back to zero at high latitudes towards poles.

The error also does not take into account additional differences caused by variation of the altitude on ground, or by the irregular variations of the geographic polar axis, and other errors caused by celestial tidal effects and climatic effects on the average sea level, or by continent drifts, major earthquakes, and magmatic flows below the crust).

A zoom level determines how much of the world is visible on a map. Mapbox provides maps in 23 zoom levels, with 0 being the lowest zoom level (fully zoomed out) and 22 being the highest (fully zoomed in). At low zoom levels, a small set of map tiles covers a large geographical area. At higher zoom levels, a larger number of tiles cover a smaller geographical area.

Map tiles are stored in a quadtree data structure. At zoom level 0, you can see a map of the whole Earth, and this image is contained in a single tile. At zoom level 1, the single tile you saw at zoom level 0 splits into exactly four tiles so the whole world fits in a 2x2 tile square. Each zoom level quadtree divides the tiles of the one before it, which creates a grid of 2zoomx2zoom. The highest zoom level, 22, is a 222x222 grid.

Libraries based on Mapbox GL display 512x512 pixel tiles by default, while many other mapping libraries use 256x256 pixel tiles. The only Mapbox product that work with 256x256 pixel tiles by default is the Mapbox Raster Tiles API. If you're working with Mapbox GL JS but would like to display 256x256 pixel tiles, you can also specify that individual Mapbox sources are 256x256 pixel tiles in your map's source definition or by ensuring the source's TileJSON is correct.

While a 512x512 tile and a 256x256 tile cover the same geographic area at any given zoom level, they will appear differently when displayed by Mapbox GL JS versus a traditional tiled map. In Mapbox GL JS, all tiles are offset by one zoom level. This means that when a Mapbox GL JS map is zoomed to zoom level 2, it will display the same geographic area as a traditional tiled map zoomed to zoom level 1. Because of this zoom offset, the appearance of a Mapbox GL JS map at zoom level 1 is the same as the appearance of a traditional tiled map at zoom level 2.

Determining the geographical distance covered by an individual pixel in a map depends on the latitude you are looking at. This table lists the approximate geographical distance in meters per pixel for each zoom level, at different latitudes. Many modern devices have displays with a pixel density that is much higher than the images they display, and they apply special transformations to make images look good. For this reason, it is important to note that the values below apply to the pixels in the map tile rather than the pixels on your screen.

These numbers are based on 512x512 pixel tiles, which are displayed in Mapbox GL-based map clients. The per-pixel value will be different for tiles served by the Mapbox Raster Tiles API, which are 256x256 pixels by default. To determine the per-pixel value for 256x256 tiles, take the zoom level you're interested in and look at the row above it.

I would say not possible in most browsers, at least not without some additional plugins. And in any case I would try to avoid relying on the browser's zoom as the implementations vary (some browsers only zoom the fonts, others zoom the images, too etc). Unless you don't care much about user experience.

If you need a more reliable zoom, then consider zooming the page fonts and images with JavaScript and CSS, or possibly on the server side. The image and layout scaling issues could be addressed this way. Of course, this requires a bit more work.

Try if this works for you. This works on FF, IE8+ and chrome. The else part applies for non-firefox browsers. Though this gives you a zoom effect, it does not actually modify the zoom value at browser level.

Previously in Map viewer, to set the desired default map location and zoom level, you just set the map as desired and hit save. I use a bookmark to keep it consistent.

It could be an aspect ratio I can't tell from the screenshots if the map area is the same width/height in both images. Also did you configure a navigation boundary for Sidebar - that could be overwriting the default extent?

Thank you for the quick reply. I only made a minor update to the maps pop-up, did change the map location and zoom level. The Sidebar app map location and zoom level look very different than just a few days ago.

Thank you for looking into it further. I updated the map last week as well, the change did not happen until I updated the map today. I don't know if it's something on the map viewer side, or with instant apps. Something is different.

Ryan, I'm just a rookie, but in the app that I'm creating, The extent and centering seem to be different by a factor of 10. In pro, I set my extent and centered my view for startup, but when I run the app, it is zoomed out and slightly offset. when you published the map, did you get a message in the top right saying features will be drawn with an offset? I would look there, and check your sharing log for any "hidden messages". Like I said, I'm just a rookie, so take this with that caveat in mind.

here is my web link recently i got the task to increase its width just like if Firefox we press Ctrl + and browser zoom level is increases is there any way to do this automatically in all browsers on page load.

Note that previous versions of this answer used transform to support more browsers. However, this shortened code appears to work for current versions of Chrome, FF, Safari and IE (as well as previous versions of IE, which have supported zoom for a long time).

So when you open it on a very big screen (tv or large monitor) it looks really ugly (because it is too much whitespace at that point). And as a user, I need every time zoom it in. My webapp is more aesthetically pleasing as well as easier to use from a sofa on tv when it is scalled up a bit on that large screen.

(recommended, harder for existing page) To use em and rem units while developing your page. That will allow changing "zoom" of the page as easy as changing font size on body.

(not-recommended, easy for existing page) To use CSS "zoom" property despite the fact that it is not a standard property. Sacrifices Firefox. Also, have some minor unexpected behavior with absolutely positioned flexboxes.

In 2022, almost browsers still block the behavior of customization the browser zoom level from code (as I read somewhere, it is stated to be a bad practice and it should be controlled by the user, not the web itself).

Although, we still can handle this by a small "hack", which just effect the view (look & feel), not changing the real browser zoom level. It may also break your layout in some situations (if responsiveness available).

I'm getting the results I expect but regardless of which search source I use the map does not zoom at all. I've tried editing the search source to change the zoom scale but this doesn't seem to make any difference.

Thanks for sharing your map. When the search polygon is not included in the results it looks like the app is staying at the current scale, if the polygon is included as a result option it will zoom. I've logged an issue for the zoom not occurring when the polygon is not included with the results.

The zoom settings in the search source configuration does not override the app settings to zoom to the extent of the polygon. We are planning to add a setting in the next update of ArcGIS Online that would allow app creators to set a specific zoom scale after the search (to override the default polygon extent). Are you able to share a live example where the map is not zooming to the extent of the largest polygon in the search?

Has the ability to allow app. creators to set a specific zoom scale after the search (to override the default polygon extent) been implemented in the zone look up instant app? I see there was a new AGO release in June 2023. I didn't see that functionality listed in the blog that discusses the changes in the newest release. My zoom settings aren't being honored in the app. even though I am using the search polygon in the result option list.

@MollyWatson1 You can override the default scale by setting a specific scale level. This setting is located in the full setup of the app in the Zone Lookup section > Style Results subection > Set scale level. Another way to find settings is to use the Search Settings option (top left corner) and search "set scale". Once there you can define the scale level you'd like to be set after every search.

Thanks for the additional information. When I set the scale setting under the Style Results section, the scale setting isn't honored after the search is made. The map zooms to the same level, which is the parcel level. Here's a screen shot of my results:

I had an incident where my CTRL key was stuck and the mouse wheel was adjusting the zoom level of my Windows 10 desktop. I would like to reset the zoom level back to its default, but CTRL-0 doesn't seem to work on the Windows desktop. I have no way of knowing (besides eyeballing) if my desktop is back to the default zoom level when I adjust it. Is there any way of resetting it to the default?

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