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Sky Imaging Frequently Asked Questions

1. General

  1. What is the average lifetime of a TSI?
  2. If a TSI system is exposed to salt spray, will regular cleaning hurt the chrome mirror? Generally, how often will the mirror need to be replaced?
  3. I got a 'JAVA.LANG.EXCEPTION' error on my TSI-880. Why is this?
  4. How difficult was it to develop the cloud cover image processing algorithm?
  5. What is the policy of TSI software upgrades?
  6. Does YES sell reusable flight cases for the TSI?
  7. Can I run systems in remote areas without AC power via solar panels?

2. Setup

  1. What sort of local utilities are required at the site of a TSI?
  2. The TSI-880 and TSI-440 systems are not supplied with a PC. What cables are supplied?
  3. Can I run a TSI from 240V or 50Hz ?
  4. Does the TSI-440 and TSI-880 require a static IP address on the Ethernet LAN segment or can we use DHCP?
  5. How much cabling can be used between the TSI and the LAN hub connection?
  6. How can the TSI system handle extremely high wind conditions?
  7. Can a TSI work at high altitudes?
  8. How do I mount a TSI mechanically at the site?
  9. Does the TSI have to be mounted in a particular position? Can you rotate the mirror or configure the software to have it "point north"?
  10. How is a TSI instrument supposed to be grounded?
  11. How can we set up the TSI so that the strap on the mirror can block the sunlight automatically?

3. Operational

  1. Can the TSI detect thin cirrus clouds?
  2. Does the TSI require periodic calibration?
  3. What is the maintenance required for a TSI-440 or TSI-880? Is there an annual maintenance fee?
  4. Is there a heater/cooler in the TSI system?
  5. What sort of CCD is used - is it for video motion or still picture?
  6. How does the CCD deal with the sun saturating and washing out the CCD?
  7. Does the CCD use Red/Green/Blue filters to get false colors? What is 24 bit color?
  8. What is the raw TSI image file format?
  9. Can I get spectroradiometric information from a TSI image?
  10. What is the spatial resolution of images from a TSI imager?
  11. Can the TSI indicate cloud base distance?
  12. Can the TSI software be fine-tuned in terms of sensitivity? On the animated TSI demo that I downloaded, I noticed that some thin clouds don't get recognized, which would pertain to high altitude cirrus clouds as well. Can the user adjust the sensitivity of cloud detection or are there any other parameters that can be changed?
  13. How much bandwidth is required by the TSI-440 and TSI-880 assuming one minute sampling rate?
  14. Does the TSI software take into consideration the curvature of the sky and calculate cloud cover appropriately?
  15. Is the TSI software compatible across multiple software platforms?
  16. On the built-in Ethernet connection, what type of connectors are provided (e.g. BNC 10Base2 or RJ-45 for 10BaseT)?
  17. We also own your UVB-1 pyranometer. Could you explain any benefits of obtaining the TSI working in conjunction with it.
  18. How do fixed items in the TSI field-of-view (e.g. towers) affect processed data?
  19. What are white horizontal lines across a TSI raw image?
  20. How often must the shading strap be replaced on the TSI mirror? Is a spare needed?
  21. Does the TSI-440 have the ability to have its clock automatically updated from an outside source (for instance, via communication with our system) to keep the time stamp coordinated with the rest of our instrumentation?
  22. Do we have to run the heater on the TSI all the time? It seems to need a lot of power.
  23. How important is time keeping on the TSI?
  24. Can I operate the TSI with the mirror removed, even for a short time?
  25. Do birds seem to bother the TSI mirror?
  26. Does TSI stop collecting data down during the nighttime?
  27. Does the TSI calculate percentage of sky coverage and output an actual number, or is some programming involved?
  28. How long can the TSI be operated unattended?
  29. Why when I point IE to the TSI-880 do I get a "unable to connect to TSI server" message.

4. Instrument Selection

  1. How are images on the TSI-880 stored long term? How are images stored on the TSI-440?
  2. Is the TSI being used by the US National Weather service?
  3. Is YESDAQ the only way to run the TSI-880?
  4. Do I need to provide a standby 12V car battery for the TSI?
  5. Why do I need to have a standby battery on the TSI-440 and not the TSI-880?
  6. Can we set up a simple ftp daemon to ftp images directly from a TSI-440 or TSI-880 to pull data files to a remote system instead of buying YESDAQ/DVE?
  7. If there's an Ethernet port, what is the RS-232 port used for on a TSI?
  8. What is off-line or on-line image processing with regards to the TSI-440's TSI Manager application?
  9. In terms of image quality and size, is there any difference between TSI-880 and TSI-440?
  10. Are you planning on providing a combined UV/VIS version and/or a VIS/IR version of the RSS?
  11. Is a TSI suitable for all weather operation?
  12. If a TSI system is run unattended and data is periodically downloaded once a day, what is the data volume in compressed mode going to be?
  13. If a TSI must be setup in a very hot region, i.e., 45C, will it operate properly?
  14. With the TSI-440 and TSI-880, can we implement the display of live sky images/percentage of sky cover on a web site as well as building up an image achieve?
  15. Can the TSI detect lightning activity?
  16. Is TSI-880 processing identical to the TSI-440?
  17. Why is the TSI-880 more expensive than the TSI-440?
  18. Does the TSI take images at night?
  19. Are TSI data (image files) stored as ASCII or are they stored in some proprietary format that nothing but YESDAQ can understand?
  20. We want to display the real time images from a TSI-440 on our local Intranet web page. I understand that if the template.html file is present in the computer's installation directory, then the software will automatically write a file called recent.html to the html directory with the correct parameters for displaying the current image. My question is: is it necessary to be running a separate HTTP server on the TSI computer, and if so, is there one that you recommend? If a separate server is not required, does the TSI Manager software have some capability to handle the http request?
  21. On the TSI data sheet, it indicates the typical image size is about 25 KB. Could you provide us with the max image size so that we can have a rough estimate of image bandwidth and storage requirements?
  22. Tell me about images from a live system aboard the USS Ron Brown and the Japanese Miria vessel operated by DOE's Brookhaven National Laboratory?
  23. How many days worth of images can be stored on the TSI. Of course it depends on the sampling rate, but can it hold, say, 14 days worth? What do you recommend as far as storage is concerned?
  24. Which model TSI should I chose and why?
  25. How stable are your radiometric UV/Vis instrument calibrations?



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This page was last updated on Thursday, September 14, 2006 .