Lifelong Alaskan. Family has been in Alaska 5 generations.Raised on commercial fishing boats in S.E. Alaska. Spent over 35 years working on tugs and ships. Have always been interested in the weather.Enjoy photos in WX undergound ,especially, the ones of aircraft and areas north of our home in Juneau.
Uploaded by: ak1234
Sunday June 3, 2012
Caption: The pipes pass completely under the road bed. In order to prevent frost heaves the ventilation pipes remove heat from the base of the road . This prevents the underlying Permafrost from thawing. During the winter the air flow through these pipes helps keep the Permafrost under the road frozen.
Model: Canon PowerShot S5 IS
Orientation: top - left
Resolution Unit: Inch
YCbCr Positioning: centered
Compression: JPEG compression
Exposure Time: 1/640 sec.
ISO Speed Ratings: 400
Exif Version: Exif Version 2.2
Components Configuration: Y Cb Cr -
Compressed Bits per Pixel: 3.00
Shutter speed: 9.31 EV (APEX: 25, 1/635 sec.)
Aperture: 3.62 EV (f/3.5)
Exposure Bias: 0.00 EV
MaxApertureValue: 3.62 EV (f/3.5)
Metering Mode: Pattern
Flash: Flash did not fire, compulsory flash mode.
Focal Length: 25.2 mm
FlashPixVersion: FlashPix Version 1.0
Color Space: sRGB
Focal Plane x-Resolution: 14506.67
Focal Plane y-Resolution: 14485.21
Focal Plane Resolution Unit: Inch
Sensing Method: One-chip color area sensor
File Source: DSC
Custom Rendered: Normal process
Exposure Mode: Auto exposure
White Balance: Auto white balance
Digital Zoom Ratio: 1.00
Scene Capture Type: Standard