Google Earth Javascript
Magdalen Dano
sorry I am not much of a Javascript programmer so this is a rather noob question. But I was having trouble trying to import the Google Earth Engine api file into another javascript file. All of the examples in the Earth Engine repo use a in html to access the Earth Engine features, but I want to avoid using html.
I am currently working to develop a web-based mapping application. A lot of the mapping tools such as google maps are 2d imagery. I know that google earth has a 3d browser plugin, but a requirement of this project as that I need to be able to host my own map server (I know I can with Google Earth, but the enterprise edition is pricey).
WebGL Earth is an open source software enabling visualization of maps, satellite imagery and aerial photography on top of a virtual terrain. You can use the online globe together with your own data in any browser on any platform including mobile devices. The project is sustained through the support and cooperation of the developer community.
This is a late answer, but you can try the new pure Javascript 3D Earth API at AtomJump.com, which runs in any browser from IE7+ up to Android/iPad/iPhone. There is no need for WebGL either, so it is production ready.
Three.js itself tends to set things up much like a real 3D desktop program might. We have a scene in which things live, a camera with which to view them, some lighting, a renderer to actually render things, and of course the 3D objects themselves. The list can seem a little daunting, but all of these can take shape as variables within our earth.js JavaScript file.
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Included with Google Earth Enterprise is an example of how to implement the Google Earth Plugin in /opt/google/gehttpd/htdocs/earth/earth_local.html. By default, the virtual servers point to earth_local.html when accessing globes through a web browser. Please note, however, that the Google Earth Plugin is deprecated and is not supported by modern browsers.
In the latest Mapboxstyles,Globe is the default projection. (Streets, Outdoors, and SatelliteStreets v12 and Light/Dark v11)In Navigation, Satellite, and earlier styleversions the default is Mercator.
For most maps, we recommend using globe to accurately represent locations on the Earth. The most notable limitation of globe is that only half the earth is visible onscreen at once. If you're building a static map or data visualization, an alternative projection might be a good choice.
Mapbox GL JS provides a variety of alternative "adaptive" projections, including projections optimized for thematic world maps, and projections for representing specific regions (such as the contiguous U.S. or Europe).
Projections are compatible with all tile sources and most map styles (with a few caveats below). See this example to get started quickly, or explore all available projections in this more advanced example.
Adaptive projections in Mapbox GL JS (all projections besides globe and Mercator) have a novel adaptive design that adjusts the projection as you zoom in to reduce distortion at all zoom levels by gradually transitioning from the defined projection to Web Mercator (which is optimal on higher zooms).
The bearing in rectangular projections corresponds directly to the rotation of the map (north is up). In thematic and conic projections, the concept of bearing is more complicated since the direction of north can be different at different points on the map:
Atmospheric styling is also supported only in globe and Mercator projections. In other projections, the empty area around the world is always rendered as transparent and can be styled by changing the CSS background property on the map container.
Equal Earth and Natural Earth are Pseudocylindrical projections, with straight lines of latitude and curved lines of longitude. Winkel Tripel is a Pseudoazimuthal projection with lines of latitude bending slightly inward.
The Equal Earth projection (defined as equalEarth in the Mapbox GL JS API) is a pseudocylindrical, equal-area projection. This projection accurately reflects sizes and is thus especially useful in data visualization when it's important to make regional size comparisons.
The Natural Earth projection (defined as naturalEarth in the Mapbox GL JS API) is a pseudocylindrical, compromise projection. This projection looks much like Equal Earth but displays a more "natural" appearance by minimizing shape distortion at the cost of a small amount of size distortion.
Winkel Tripel appears taller and more rounded than Equal Earth and Natural Earth, and provides more accurate shapes with less accurate sizes. Winkel Tripel is commonly regarded as one of the least distorted compromise projections. The National Geographic Society and many other educational institutions use Winkel Tripel for global thematic mapping.
Conic projections create a map with little distortion in the area around a specific point. Further away from this point, distortion increases. In albers, this is shape distortion, while in lambertConformalConic size increases with greater distance.
The Albers projection (defined as albers in the Mapbox GL JS API) is a conic, equal-area projection. Like Equal Earth, this projection provides accurate relative sizes, but shapes are increasingly distorted at further distances.
The Lambert conformal conic projection (defined as lambertConformalConic in the Mapbox GL JS API) is a conic, conformal projection used for aeronautical charts and many regional mapping systems. Like Mercator, this is a conformal projection, meaning that shapes and angles are accurately represented. Instead, regions further away from the center are increasingly exaggerated in size.
By default, this projection is centered on [0, 30] with the standard parallels [30, 30]. This projection preserves shapes and is appropriate for regional maps which need accurate shapes and angles (note that as with many other conformal projections, size distortion will increase towards the poles).
This projection is popular for aeronautical charts because straight lines on it approximate great circle routes between endpoints. Notable users include the European Environmental Agency, France, and also U.S. National Geodetic Survey for several U.S. states such as Tennessee.
A polar projection can be created by setting both parallel latitudes to 90 (for the North Pole) or -90 (for the South Pole). For instance, to create a conformal polar projection centered on Greenland:
Equirectangular and Mercator are classified in cartography as cylindrical projections. These projections have straight latitude and longitude lines. Their rectangular shape allows them to loop across their east and west edges at the 180th Meridian, useful for maps that need to cover the Pacific ocean. Looping can also be disabled with setRenderWorldCopies.
The Equirectangular (Plate Carre) projection (defined as equirectangular in the Mapbox GL JS API) is a cylindrical, compromise projection in which positions on the map directly correspond to their longitude and latitude values.
The Web Mercator projection (defined as mercator in the Mapbox GL JS API) is a cylindrical, conformal projection and the default projection in Mapbox GL JS if projection is not specified in a style. Web Mercator is classified as EPSG:3857 and is a variant of the classic Mercator projection used for marine navigation. Web Mercator was the first projection introduced in web maps and remains widely used by most mapping platforms. Before the introduction of adaptive projections in v2.6, Mapbox GL JS only supported the Web Mercator projection.
Mercator is suitable for maps remaining at high zoom or cases where a map needs to cover the 180th meridian. In Mapbox GL JS, Mercator also supports some features unavailable in other projections as outlined above.
The Globe projection (defined as globe in the Mapbox GL JS API) is a three-dimensional representation of the earth. Globe increases the sense of depth of the map and is a correct representation of the surface of the earth as viewed from space. Using this projection limits the display of the earth to one hemisphere at a time. This can be addressed in some cases by rotating the globe with camera animation.
In Mapbox GL JS, Globe is the default projection in most of the latest Mapbox styles. Globe supports some functionality that adaptive projections do not. This includes Fog/atmospheric styling, 3D terrain and Free Camera.
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