Tech Tip by Alissa Oder, July 2015
Over the years, DAT/EM Support has heard many tales of woe from customers after they experienced a power outage or power surge. There are wind storm stories, ice storm stories, thunderstorm stories, heavy equipment hitting power line stories, and poor wiring stories. There is a story about a janitor who unplugged a photogrammetrist's computer to free an outlet for the vacuum cleaner. DAT/EM's own recent, though brief, power outage happened when the landlord's electrician flipped every fuse breaker in the box to see which one turned out the lights he needed to repair. Fortunately for us, all of our computers were outfitted with a UPS, an Uninterruptible Power Supply, which is essentially a big battery with a built-in surge protector.
Some DAT/EM customers live in places where the power goes out regularly. Due to necessity, these customers tend to be more prepared than the ones in places where it happens rarely. Which group are you in?
One direct-to-wall-outlet customer had “fried” his computer's motherboard during a thunderstorm. He told us he had always thought a UPS was too expensive for his budget. Actually, the cost of a UPS has come down in the past few years. You may find that a UPS costs less than you expected. Depending on the frequency of use in your area, a UPS can quickly pay for itself by saving on repeated work and preventing expensive hardware failures.
In addition to hardware protection, you can minimize potential power outage-related data loss by checking your software's automatic save settings:
Happy saving, everyone!
By Alissa Oder, June 24, 2015
DAT/EM Support often sees the question: “My models looked perfect in my aerotriangulation (AT) software, but they have parallax after importing the project into Summit.”
First, investigate the camera file. Open three files: 1. The imported Summit camera file in Summit's Camera Editor, 2. The AT software's camera file in the AT software or in a text editor, and 3. The original camera calibration report. Check that the values appear to have transferred correctly from the calibration report to the AT software and from the AT software to Summit. Check the “Distortion” tab in the Summit Camera Editor and compare it to the other files. Look for things such as:
The following reasons top our list of other possible causes:
If you still haven't found the problem, it may be time to send part of your project to DAT/EM Support for a more in-depth investigation. Describe the problem in detail to firstname.lastname@example.org and we'll help you to ftp the files.