Comments

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  Drone-University.com January 3, 2014 at 1:12pm

  @essam

  You may have a look at this French site : http://airinov.fr/concept#/concept/télédétection

  They are using 4 different lenses of which 2 different IR, specifically to do exacftly what you are looking for.

  You may use Google automatic translation if you cannot read French.

  Cheers
• Moderator

  Michael Pursifull January 3, 2014 at 10:47am

  @Essam: ArduCopter has no trouble at all climbing to 2200 AGL; in fact, it can get there very quickly.... the limiting factors here is regulatory and one of resolution and of vibration. As you are in the US, you'll need to stay under 400ft AGL. Being closer helps in that each pixel of your camera will cover a smaller bit of your target, meaning that it is generally more useful. It also means that whatever blur effect you have from high frequency vibration is a bit less destructive to the data, as long as it is within acceptable limits.

  What is the reason you need to capture the entire area in a single shot (vs taking multiple shots in rapid succession using a patterned flight and stitching them together?) There are a growing number of software packages that stitch the photos together for you....
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  Sean Headrick January 3, 2014 at 9:25am

  @Essam As you are new to this technology, you may be overlooking the possibility of photo-stitching. In general terms this would allow you to take lower altitude, higher resolution images that could then be stitched together into a single flat image or into an actual 3D orthomosaic based on common points among the images or GPS tagging. It is still a pretty large area, but a fixed wing outfitted properly should be able to satisfy your requirements

    
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  Charles lakins January 3, 2014 at 9:20am

  I wouldn't say altitude is your problem until it comes to the camera resolution and filtering capabilities any craft given the amount of flight time required will perform the needed altitude and allow you the decent time to land too

   

  to achieve the filtering required are there limits to distance to be effective ?

  my concern is the farther away the less likely to get results usefull
• Alan Jump January 3, 2014 at 9:16am

  @Essam Your operating altitude is going to depend on the field of view of your selected lens. If you need the camera to capture a single image to cover 120 acres, and your lens has a 38 degree viewing angle, my maths say you'll need to fly at around 2200 feet AGL. A wider-angle lens will reduce that altitude, but may distort the image.
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  Essam January 3, 2014 at 9:02am

  Hi everyone; Happy new year. I am new to this field but I am interested in building my own uav using this site support. The reason I need a UAV is for my agricultural research. I need to be able to capture a 120-acre field in one single shot/photo using a near infrared capable camera. I need near infrared because it helps identifying stressed vegetation (I would need both the red and near infrared reading to do this). I am concerned that I may need to fly too high to be able to see a 120 acre field in one shot; in this case what uav design/model would allow me to accomplish this task? I am thinking of buying a small camera and modify it so that it can capture both the red and near infrared area of the spectrum. I am on a small budget so not looking to spend thousands; especially on my first uav.. Many thanks
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  ShadowAir Ltd. December 24, 2013 at 4:47pm

  Removed as advertising.
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  Sean Headrick December 24, 2013 at 11:40am

  I am a bit perplexed. I was helping to diagnose a problem on a friend's copter (quad) and found I could get nowhere without connecting to the APM through MP. I feel like I have a lot of experience with the APM but have not seen this. The yellow LED blinks as normal, but I get neither of the red or blue indicator leds. when I try to connect to MP i get a "No Heartbeats received" error message. I tried to connect through the CLI with no success. Would the yellow LED flash if the fuse was blown. Any suggestions are much appreciated.

   
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  Bob Kirkpatrick December 22, 2013 at 11:27pm

  @Gunnar Baardsen  you have the right gimbal, that is the one I was talking about. I use mine with a Naza controller and the servos plug directly into the X channels and doesn't need an auxiliary gyro/IMU. he APM also permits this using any free channels for up to 3 axis control.(see http://copter.ardupilot.com/wiki/camera-mount/) 

  If you decide on the Alware, I suggest that you replace the all plastic servos with ones with metal gears and ball bearing shaft. I am noting some lash from wear appearing. Lately I have been flying a Nikon Coolpix LX810 and I think its weight is wearing out the inexpensive servos that came with the Swing.
• Gunnar Baardsen December 22, 2013 at 8:19pm

  @BobKirkpatrick

  Is it this 2-axis gimbal you are referring to - http://www.alwarerc.com/shop/swing-2axis-camera-mount-p-67.html

  I read from the specs that they recommend the use of a gyro stabilization. I was under the impression that such a stabilizing feature is built-in with the APM 2.5, hence it's not needed with any additional hardware to control this gimbal.

  Or am I wrong here?? I have a 3DRobotics quad (under rebuilding to a hexa these days) that I want to equip with this gimbal with a Canon S100 PowerShot camera.

  

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