Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Can overhead tranmission lines be located via sattelite imagery?

  1. Aug 12, 2009 #1
    Not really sure if this is the place for this, but can overhead tranmission lines be located via sattelite imagery?
     
  2. jcsd
  3. Aug 12, 2009 #2

    mgb_phys

    User Avatar
    Science Advisor
    Homework Helper

    Depending on the satellite - yes

    You aren't going to see the actual wires unless there is a fault and you have military grade IR.
    But the pylons and especially the path of the lines does show up very well - especially cross country. In most places the power company will also cut back trees for a certain distance around the lines and a 10m wide perfectly straight cutback path across a forest shows up very well even on extremely low res imaging.
     
  4. Aug 12, 2009 #3
    Look for yourself on google earth.
     
  5. Aug 12, 2009 #4
    Where does google earth get the images? Are they all really satellite photos?
     
  6. Aug 12, 2009 #5
    Google earth arent all satellite images, they phase into aerial photo shots. No idea at what altitude though.
     
  7. Aug 17, 2009 #6

    mheslep

    User Avatar
    Gold Member

    Where google support's their higher resolutions ( 2 ft/pixel) yes, certainly. I had occasion to track a power line in my area for miles. The line itself is not necessarily visible, though it's shadow often is, and the towers of course always are at 2ft/pixel and less.
     
  8. Aug 18, 2009 #7

    mgb_phys

    User Avatar
    Science Advisor
    Homework Helper

    Even on the much lower resolution satelite pictures you can 'see' long straight features that are much less than one pixel with some image processing.
    A change in brightness of a few % in each pixel spread over 100s of pixels in a line is easily detectable - it's called super resolution.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Can overhead tranmission lines be located via sattelite imagery?
Loading...