NASA WORLD WIND（地球放大镜）

wdd500

NASA WORLD WIND官网

    NASA World Wind俗称地球放大镜，是NASA(美国)国家航空和宇宙航行局联合出品，类似Earthview 3D的鸟瞰工具，更加权威而且目前完全免费。透过这套程序的3D引擎，可以让你从外太空看见地球上的任何一个角落。结合在线的资料库，World Wind最高的解析度可以达到每象素代表15公尺，也就是说一些比较大的街道可以看得一清二楚，而且包括了可见光以外得影像。此外，透过其中的功能，你可以进行一趟地球的3D飞行之旅，体验飞过圣母峰的感觉。另外透过及时动画形成的模组你可以即时体验飓风如果席卷佛罗里达州或者是气候变化情况。
  NASA World Wind是多种技术的结晶，它包括：
  1、3D Engine可以使用电脑3D硬件加速，它的系统需求为： Windows 2000, XP Home, or XP Professional Intel Pentium 3, 1 GHz, or AMD Athlon or higher 256 MB of RAM 3D Graphics Card nVidia GeForce 2 Ultra ATI Radeon 7500 Intel Extreme Graphics 2 DSL / Cable connection or faster 2 GB of disk space
   2、Blue Marble 技术使World Wind的最高解析度可以达到每像素代表15公尺；
  3、Land Sat 7技术可以查看过去的影像资料；
  4、SRTM技术可以以地面飞行的状态查看；
  5、MODIS灾害性事件监视；
  6、GLOBE查看全球气温变化；
  7、Country State Borders边界线查看；
  8、Place names地名查看

官网下载

需要先安装microsfot .net framework（我安装的是 .net framework2.0版的， .net framework1.0版本的没有验正，不过网上好多说要2.0的支持）和Dirextx9。
以前下过好几个不是官网的装上后打不开，我在官网下的这个安装验证可以使用。

以下引自官网：
3D Engine

   World Wind allows any user to zoom from satellite altitude into any place on Earth, leveraging high resolution LandSat imagery and SRTM elevation data to experience Earth in visually rich 3D, just as if they were really there.

   Particular focus was put into the ease of usability so people of all ages can enjoy World Wind. All one needs to control World Wind is a two button mouse. Additional guides and features can be accessed though a simplified menu. Navigation is automated with single clicks of a mouse as well as the ability to type in any location and automatically zoom into it.

   World Wind was designed to run on recent PC hardware with 3D acceleration. Please refer to the download section for more information on system requirements.



Blue Marble

   World Wind has a full copy of the Blue Marble, a spectacular true-color image of the entire Earth as seen on NASA's Earth Observatory: the Blue Marble.

   Put together from data of a variety of satellites such as MODIS and Terra, the Blue Marble can be seen in all its glory at 1 km per pixel resolution.


Land Sat 7

   Using World Wind, you can continue to zoom past Blue Marble and reveal the extremely detailed seamless mosaic of LandSat 7 data.

   LandSat 7 is a collection of images from 1999-2003 at an impressive 15 m per pixel resolution. It includes other color bands such as the infrared spectrum. Users will be able browse these different sets as they become available. Any changes and updates are automatically inherited by World Wind.

   LandSat 7's resolution makes it possible to see your own city, neighborhood, or landmarks in your vicinity. Seeing the whole globe like this puts the world in context with scientifically accurate data.

   The complete LandSat 7 data set is too large to fit on a single machine so World Wind only downloads what you see and stores a compressed copy on your computer for later viewing.


SRTM

   Combining LandSat 7 imagery with Shuttle Radar Topography Mission (SRTM) Data, World Wind can display a dramatic view of the Earth at eye level. Users will literally be able to fly across the world in any direction.


   In addition, World Wind can exaggerate these views so a user can easily pick out the details.

NASA SVS

   Goddard Space Flight Center (GSFC) has produced a set of visually intense animations that demonstrate a variety of subjects such as hurricane dynamics and seasonal changes across the globe.

   World Wind can take these animations and play them directly on the world. Anyone can immediately grasp where the event is taking place as World Wind rotates automatically into view.

MODIS

   Moderate Resolution Imaging Spectroradiometer or MODIS produces a set of time relevant data that's updated every day. MODIS catalogs fires, floods, dust, smoke, storms and even volcanic activity.

   World Wind produces an easily customized view of this information and marks them directly on the globe. When one of these color coded markers are clicked, it downloads the full image and displays them.

   MODIS images can download publication quality material at a resolution of 250 m per pixel. Anew fresh set of images can be downloaded every day.

   World Wind also has a \"tour mode\" to automatically skim through any number of samples.




GLOBE

   World Wind is capable of browsing through and displaying GLOBE data based on any time the user wants. For example, a user can download today's (or any previous day's) temperature across the world.

   You can view rainfall, barometric pressure, cloud cover, or even the student GLOBE samples themselves. Each sample comes with a temperature scale



Country & (USA) State Borders

   World Wind has a complete set of borders that traces every country and state. As you zoom into the world, the boundaries become more precise

   You can observe where mountain ridges and rivers have formed the political boundaries of today.

Place names

   World Wind has a full catalog of countries, capitals, counties, cities, towns, and even historical references. The names update dynamically, by increasing in number as the user zooms in. This prevents too many names from cluttering up the screen.

   It's likely that you'll find your own town no matter how big or small it is in World Wind.

Visual Tools

   World Wind comes with a variety of visual guides that help the user's experience such as latitude and longitude lines, as well as extremely precise coordinate data.

   These helpers can be toggled on or off any time and are viewable with any of World Wind's other features turned on.

Landmark Set

   World Wind has the capability to display actual 3d models of landmarks on the earth. This helps to see the world in context to places a user may have been to. Those landmarks that do not have 3D models for it yet have place markers similar to how MODIS displays places of interest.


Notes

   World Wind benefits most from a video card with 3D acceleration. If you don't know whether your machine comes with one, it is likely to have one built in if the computer was purchased within the past two years. Here is a list of video cards that have been reported to work with World Wind.

   World Wind requires that you have .NET runtime environment and DirectX installed. You can download .NET runtime environment and DirectX runtime.

   World Wind comes with data you can zoom into. After a certain point, World Wind will begin to download more images automatically. The servers hosting this information are very busy and may be unresponsive until we get the necessary infrastructure.

   NASA World Wind leverages Microsoft .NET technology for rapid development and to easily access open standards such as XML, WMS, and other graphics standards. Real-time 3D graphics are driven by DirectX allowing a wide base of compatibility with accelerated video hardware.

   Primary data sources come from NASA, and TerraServer-USA of Microsoft Research.