FAQ’s on NASA World Wind
Does NASA World Wind provide real time images?
The server sends imagery to its users by compressing it from gigabytes to many hundred megabytes. Even after the images are compressed to several hundred megabytes, the bandwidth needed for the server will be quite large. Even if this task is achieved somehow, the internet connection of most users is not that fast to update data every hour. However for MODIS, Global Clouds are frequently updated, hence they can be referred as real time images.
What is the problem with colors for new Landsat. Why isn't my area covered?
NLT landsat was made with the intention of offering more colors to images. The quality of new Landsat is not that high when compared to original landsat dataset. However, most locations are covered at 30m/pixel resolution.
How to load 0.25 m resolution in the same manner in which screenshot of DC is displayed as a sample?
For doing so, select Layer manager. Then click on images and then choose USGS Urban Area Ortho. An alternate way to do the same task is by clicking on USGS urban button.
Why is that only white tile appearing when trying to view the USGS Urban data?
Currently urban data is unavailable for all categories. That is why there is a possibility that these images are unavailable for your town. Therefore, you should first check whether your town is listed in urban area list or teraserver website. If your town is not listed then you will only see white green patch on screen. You can also use the urban layer highlighter for locating areas.
How are USGS layers used?
USGS dataset is United States Geological survey. That is why you can obtain images only for United States. However, such data available for other regions in most cases is not free. Hence, NASA does not include them in World Wind.
Why is SRTM feature of NASA World Wind not working as expected?
This can occur because of several factors. In case the area is flat, then probably you are looking an area that is below or above 60 degree latitude. For these areas, you will not find any elevation data if the satellite has taken images for regions that are around equator. On the other hand, latitudes above 60 degrees are too extreme; hence, recent data is unavailable for them.
However if you are viewing inside 60 degrees then probably the data for that region is taken using bats echolocation or sonar measurements. In such cases, elevation is sounded from satellite.
In order to install NASA World Wind, what should be the system configuration?
Your computer should have Windows 2003, 2000 and XP operating system. Unfortunately, NASA World does not Macintosh or Linux. To get live updates, an internet connection is a must. In addition, to view 3D imagery, your computer should have a 3D graphics card. Windows 95, 98 versions of Windows are not maintained by Microsoft, hence NASA World Wind may not run on these operating systems.Technorati Tags: NASA, NASA world wind, using world wind, features of world wind,
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