Clementine Lunar Image Browser Help
The Clementine Lunar Image Browser (CLIB) is a new and experimental system. It has grown significantly since its introduction in December of 1994 and will continue to evolve in the months to come. Although the way in which it is used may be altered as better methods for selecting and viewing the data are found, this instruction set will always reflect the current version of the CLIB. The current CLIB, version 1.5, has three pages or screens associated with it; the multi-resolution page, the request status page, and the data viewer page.
- This is typically the first section that users of the CLIB come to. It allows you to zoom in and out of a large Mercator map of the Moon. It is intended as an intuitive overview of the data set. By inputting values for location, resolution and size you can have the CLIB immediately create an image of the Moon that details your area of interest.
- Location - is indicated one of two ways. The location can be indicated by placing values in the Longitude and Latitude fields or by a mouse click on the image of the Moon currently displayed. The default image that is displayed has zero degrees Latitude and zero degrees Longitude in its center. The Latitude and Longitude of the center of whatever image you have created after that will be automatically placed in the Lat/Long fields toward the bottom of the page. If you use the Lat/Long fields to input the location you want remember that Latitude ranges from -90 degrees to 90 degrees and Longitude ranges from zero degrees to 360 degrees with degrees Longitude increasing as you move right to left.
- Desired Resolution - allows you to indicate how detailed you would like the next image to be. By default it will be set to the button below the one previously used to generate the currently displayed image. This allows you zoom-in again and again with only a mouse click on the image of the moon.
- Image Size - is currently limited to three possibilities: 256 pixels by 256 pixels; 512 pixels by 512 pixels; and 768 pixels by 768 pixels. The larger images are generated almost as quickly as the smaller ones but they can take significantly longer to deliver especially if you're connected to the Internet via a modem.
- The files are stored primarily on D2 small tape and are brought to hard drive space as needed. Once they are in hard drive space they remain there until the hard drive space (67 gigabytes) fills up. When that happens the files that have been used the least get placed back on tape. The Request Status page indicates that the file you requested is on tape and that the server is in the process of retrieving it to the hard drives. This process is completed in under a minute. There is, however, a finite number of these transfers that can happen at once so performance is reduced as the number of users increases. Requests are handled in the order they are received.
- Information associated with the image is displayed on this page for the your convenience. On rare occasions you may notice a discrepancy between the variable you chose and the variables that are displayed. If the database didn't have an image associated with the variables you chose the server will choose an image with similar variables as an alternative.
- It is best to wait 60 seconds before pressing the Load Image button. This allows time for the retrieval from tape to take place. If you press the Load Image button before the file has been retrieved you receive a page that is almost identical to the Request Status page. If you are using a WWW browser that supports the META html tag (Netscape for instance) the browser will automatically try to load the image every 60 seconds.
- The data viewer page looks very similar to the multi-resolution. You may notice that the image shown is quite detailed and it's not square as the others were. As this image is a copy of the data recorded by the spacecraft those factors are determined by the sensor that recorded the data. You'll also notice arrows pointing in eight directions away from the image. You can search for a new image from this page one of two ways:
- Pressing one of the arrows around the lunar image will request the file that is adjacent to the current image. Any values that are in the form below the arrow pad are ignored if the arrow pad is used.
- If you choose not to use the arrows to move to an adjacent image then all the fields in the form are available to you. Use the Use Lat/Long button to submit you choices to the CLIB.
More Information
- More information about the Clementine Lunar Image Browser is available on the CLIB Frequently Asked Questions page and the Deep Space Probe Science Experiment, Clementine is available. You are also encouraged to send mail directly to Webmaster with your questions, complaints, comments, etc.
Send comments to webmaster@www.nrl.navy.mil
