Google Earth是 Google 的另一个出色产品，它提供了(Google)地球(Earth)的 3D（三维）图像。这些照片显然来自卫星。它允许用户在他们的屏幕上看到世界各地。
谷歌地球(Google Earth)背后的想法是充当一个地理浏览器，它将从卫星接收到的所有图像组合成复合形式，并将它们绑定成一个 3D 表示。Google地球以前称为Keyhole EarthViewer。
除了隐藏的地方和军事基地外，我们的整个星球都可以使用这个工具进行查看。您可以在指尖旋转地球，随意放大和缩小。
这里要记住的一件事是，谷歌地球(Google Earth)和谷歌地图(Google Maps)都非常不同。不应将前者解释为后者。根据Google 地球(Google Earth)的产品经理Gopal Shah的说法，“您通过 Google 地图找到自己的方式，而 Google 地球则意味着迷路(You find your way through Google maps, while Google Earth is about getting lost)”。这就像您的虚拟世界之旅。
Google 地球中的图像是实时的吗？(Are the images in Google Earth real-time?)
如果您认为可以放大到当前位置并看到自己站在街上，那么您可能需要重新考虑。正如我们上面提到的，所有的图像都是从不同的卫星收集的。但是你能得到你看到的地方的实时图像吗？嗯，答案是否定的。卫星随着时间的推移围绕地球旋转收集图像，并且每颗卫星需要一个特定的周期来管理和更新图像(Satellites collect the images as they revolve around the earth over time, and it takes a specific cycle for each satellite to manage and update the images)。现在问题来了：
Google 地球多久更新一次？(How often does Google Earth Update?)
在Google 地球(Google Earth)博客中，它写道它每月更新一次图像。但这不是它。如果我们深入挖掘，我们会发现Google不会每月更新所有图像。
平均而言，谷歌地球(Google Earth)的数据在一瞬间大约有一到三年的历史。但这不是和谷歌(Google)地球每个月更新一次的事实相矛盾吗？好吧，从技术上讲，它没有。谷歌(Google)地球确实每个月都会更新，但只是一小部分，普通人不可能检测到这些更新。世界的每一部分都有一定的因素和优先权。因此， (Hence)Google 地球(Google Earth)各个部分的更新取决于以下因素：
1. 位置和区域(1. Location & Area)
城市地区的不断更新比农村地区更有意义。城市(Urban)地区更容易发生变化，这需要谷歌(Google)来应对这些变化。
除了自己的卫星，谷歌(Google)还从各种第三方拍摄照片以加快他们的进程。因此，对高密度区域的更多更新会大大加快。
2. 时间和金钱(2. Time & Money)
Google并不拥有所有资源；它需要从其他方购买其图像的某一部分。这就是时间和金钱概念的来源。第三方没有时间发送世界各地的航拍照片；他们也没有钱为此投资。
您一定已经注意到，有时您放大太多时只能看到模糊的图像，而有几次您可以清楚地看到您所在位置的停车场。这些高分辨率图像是由航拍创建的，不是谷歌(Google)做的。Google从点击这些照片的各方购买此类图像。
谷歌只能为所需的高密度区域购买此类图像，因此赚钱和时间是更新的一个因素。
3. 安全(3. Security)
有许多机密地点，例如受限的军事基地，由于安全原因很少更新。其中一些区域已经永远被黑了。
它不仅适用于政府主导的领域，而且谷歌(Google)也停止更新那些怀疑使用图像进行犯罪活动的领域。
为什么不连续更新？
上述因素也回答了这个问题。Google不会从自己的来源获取所有图像；它依赖于几个供应商，显然谷歌(Google)必须向他们付款。考虑到所有因素，持续更新将需要大量金钱和时间。即使谷歌(Google)这样做，也完全不可行。
因此，谷歌(Google)包括。它根据上述因素计划更新。但它也有一条规则，即地图上的任何区域都不应超过三年。每张图片都必须在三年内更新。
Google 地球具体更新了什么？(What specifically does Google Earth update?)
正如我们上面提到的，谷歌(Google)不会一次更新整个地图。它以位和分数设置更新。这样，您可以假设一个更新可能只包含几个城市或州。
但是如何找到已更新的部分？好吧(Well)，Google本身会通过发布KML 文件(KML file)来帮助您。每当更新Google地球时，也会发布一个KLM文件，其中将更新的区域标记为红色。通过遵循KML(KML)文件，可以轻松地填充更新的区域。
你能要求谷歌更新吗？(Can you request Google for an update?)
既然我们已经研究了不同的考虑因素和因素，谷歌(Google)在更新中必须服从，是否可以要求谷歌(Google)更新某个区域？好吧，如果Google开始根据请求进行更新，它将破坏所有更新计划，并且会花费更多资源，这是不可能的。
但不要难过，您正在寻找的地区可能在“历史图像(historical imagery)”部分有更新的图像。有时，Google会将旧图像保留在主要分析部分中，并将新图像发布在历史图像中。谷歌(Google)并不认为新图像总是准确的，因此如果它发现旧图像更准确，它会将相同的图像放入主应用程序，而将其余图像放入历史图像部分。
受到推崇的：(Recommended:)
在这里，我们谈了很多关于Google Earth的内容，您一定已经了解了它更新背后的所有想法。如果我们总结所有要点，我们可以说谷歌地球(Google Earth)更新了部分和部分，而不是遵循一个固定的时间表来更新整个地图。而要回答“多久”的问题，我们可以说——谷歌地球在一个月到三年之间的任何时间执行更新。(Google Earth performs updates anytime between a month and three years.)
How often does Google Earth Update? (2022)
Google Earth is another splendid product frоm Google that gives a 3D (three dimensionаl) image of Earth. The photographs cоme from satellites, obviously. It allows the υsers to see all around the world within their screen.
The idea behind Google Earth is to act as a geographical browser that combines all the images received from satellites in composite form and binds them to form a 3D representation. Google earth was formerly known as the Keyhole EarthViewer.
Our entire planet can be viewed using this tool, except for the hidden places and military bases. You can spin the globe at your fingertips, zoom in & zoom out as you like.
One thing to keep in mind here is, Google Earth and Google Maps both are very different; one should not interpret former as the latter. According to the product manager of Google Earth, Gopal Shah, “You find your way through Google maps, while Google Earth is about getting lost”. It is like your virtual world tour.
Are the images in Google Earth real-time?
If you think that you can zoom in to your current location and see yourself standing on the street, then you might want to reconsider. As we have mentioned above, all the images are gathered from different satellites. But can you get real-time images of the places you see? Well, the answer is No. Satellites collect the images as they revolve around the earth over time, and it takes a specific cycle for each satellite to manage and update the images. Now here comes the question:
How often does Google Earth Update?
In the Google Earth blog, it is written that it updates the images once a month. But this is not it. If we dig down deeper, we get that Google does not update all the images every month.
Speaking on average, the Google Earth data is approximately one to three years old at an instant. But doesn’t it contradict the fact that Google earth updates once every month? Well, technically, it does not. Google earth does update every month, but a tiny portion and it is impossible for an average person to detect those updates. Every part of the world holds certain factors and precedence. Hence the updates of each part of the Google Earth depend on these factors:
1. Location & Area
A constant update of urban areas makes more sense than the rural areas. Urban areas are more prone to changes, and that requires Google to cope up with the changes.
Along with its own satellite, Google also takes pictures from various third parties to speed up their processes. Therefore, more updates on high-density areas speed up drastically.
2. Time & Money
Google does not own all the resources; it needs to buy a certain part of its images from other parties. This is where the concept of time and money comes. The third parties do not have time to send aerial photos of all over the world; neither do they have money to invest for that.
You must have noticed that sometimes all you can see is a blurry image when you zoom in too much, and a few times you get to see the car parking of your place clearly. Those high-resolution images are created by aerial photography, which is not done by Google. Google buys such images from the parties that click these photos.
Google can only buy such images only for required high-density areas, hence making money and time a factor of updates.
3. Security
There are many confidential locations, such as confined military bases that are rarely updated due to security reasons. Some of these areas have been blacked out since forever.
It is not only for government-led areas, but Google also stops updating those areas where suspicions arise of using images for criminal activities.
Why aren’t the updates continuous?
The above-mentioned factors answer this question too. Google does not obtain all the images from its own sources; it relies on several providers, and Google has to pay them, obviously. Considering all the factors, it will require a whole lot of money and time to update continuously. Even if Google does that, it is not at all feasible.
Therefore, Google comprises. It plans the updates according to the above factors. But it also has a rule that no region of the map should be more than three years old. Every image has to be updated within three years.
What specifically does Google Earth update?
As we have mentioned above, Google does not update the whole map in a single go. It sets updates in bits and fractions. By this, you can assume that one update may only contain a few cities or states.
But how do you find the parts that have been updated? Well, Google itself helps you by releasing a KML file. Whenever Google earth is updated, a KLM file is also released, which marks the updated regions with red. One can easily pot the updated regions by following the KML file.
Can you request Google for an update?
Now that we have looked into different considerations and factors, Google has to obey in updates, is it possible to ask Google to update a certain region? Well, if Google starts updating on requests, it will shatter all the updating schedule and would cost a lot more resources which won’t be possible.
But don’t be sad, the region you are looking for might have an updated image in the “historical imagery” section. Sometimes, Google keeps the older image in the main profiling section and posts the new images in historical imagery. Google does not consider new images to be accurate always, therefore if it finds an older image to be more accurate, it will put the same into the main app while putting the rest in historical imagery section.
Recommended:
Here, we have talked a lot about Google Earth, and you must have understood all the idea behind its updates. If we summarize all of the points, we can say that Google Earth updates bits and parts rather than following a fixed schedule for the update of the whole map. And to answer the question of “How often”, we can say – Google Earth performs updates anytime between a month and three years.
