[OpenDroneMap-dev] Fw: [OpenDroneMap-users] Mesh Plotter for LidarLITE

[Dakota Benjamin]

Many country/state/local governments release LiDAR data for free, which could be used for developing and testing this workflow.


For example: https://environmentagency.blog.gov.uk/2015/09/18/laser-surveys-light-up-open-data/

[http://sig.cmparks.net/cmp-ms-90x122.png]Dakota Benjamin
Geospatial Developer
clevelandmetroparks.com<http://www.clemetparks.com/>


<http://www.clemetparks.com/>

<http://www.clemetparks.com/>"It is not down in any map; true places never are."

      Herman Melville



________________________________
From: mather.stephen at gmail.com <mather.stephen at gmail.com> on behalf of Stephen Mather <stephen at smathermather.com>
Sent: Saturday, December 26, 2015 10:56 PM
To: Dakota Benjamin
Cc: opendronemap-dev at lists.osgeo.org
Subject: Re: [OpenDroneMap-dev] Fw: [OpenDroneMap-users] Mesh Plotter for LidarLITE

Dakota got a Lidar Lite from a friend... . I think affordable lidar scanners are going to rapidly become the norm, so we need to think through how they fit in to the photogrammetric workflow. Here are my initial thoughts:

LiDAR is cool, but requires accurate position and orientation info. Good sensors for position and orientation are expensive. Anecdotally, great orientation sensors are $20k. For RTK GPS, one can use Piksi at $1000 or other units at $10k and up, but this is still expensive.

I think the solution is to calculate the position and orientation of the sensor from photogrammetric info combined with GPS, and then use that to reverse calculate the LiDAR point cloud. I don't know yet what the accuracy will be, we'll at least be able to test the accuracy of photogrammetric positions (XYZ, but not orientation) from ODM if we use a dataset with RTK.

Thoughts?
Best,
Steve




On Thu, Nov 19, 2015 at 1:09 PM, Dakota Benjamin <dmb2 at clevelandmetroparks.com<mailto:dmb2 at clevelandmetroparks.com>> wrote:

I think this is an interesting development problem space.

[http://sig.cmparks.net/cmp-ms-90x122.png]Dakota Benjamin
Geospatial Developer
clevelandmetroparks.com<http://www.clemetparks.com/>


<http://www.clemetparks.com/>

<http://www.clemetparks.com/>"It is not down in any map; true places never are."

      Herman Melville



________________________________
From: OpenDroneMap-users <opendronemap-users-bounces at lists.osgeo.org<mailto:opendronemap-users-bounces at lists.osgeo.org>> on behalf of Andrew Jawitz <andrewjawitz at gmail.com<mailto:andrewjawitz at gmail.com>>
Sent: Thursday, November 19, 2015 11:41 AM
To: opendronemap-users at lists.osgeo.org<mailto:opendronemap-users at lists.osgeo.org>
Subject: [OpenDroneMap-users] Mesh Plotter for LidarLITE

Hello All,
  I have an update and a question regarding my ongoing experimentation with the LidarLITE...
  I've been searching and searching for months for a project sample that uses the LL for 3D Mapping but apparently there were so many problems with the original i2C library in particular that hardly anyone could get it to work.  Finally, I found this tutorial-
http://myrobotlab.org/content/lidar-lite-distance-measurement-and-creating-point-cloud <http://myrobotlab.org/content/lidar-lite-distance-measurement-and-creating-point-cloud>
 which seems to be a good starting point.  If you want a good chuckle check out the comment thread which has all of these veteran robotics guys scratching their heads trying to figure out how this guy got up and running so easily.  FWIW it looks like the official documentation had just been updated to include a recommendation for this alternate i2C Library- http://www.dsscircuits.com/index.php/articles/66-arduino-i2c-master-library
  Ironically it only works with the original LL (which I have) and not the updated "Blue Label" version...

  Anyway, after loading the alternate i2C Library, I managed to get the sketch to compile on Arduino 1.6.6 and sure enough coordinates started popping up on the serial monitor!  I can create a project gist with all the code if others would like but for now you can find the sketch I'm using on my sketchbook repo- https://github.com/Cribstone/Arduino-Sketchbook/blob/master/LidarLitePointCloud/LidarLitePointCloud.ino
  If you were wondering where to find the source for the Processing Sketch referenced in the article, I was able to find it here-http://borsaci06.com/Plot_LidarScanner.pde
 While, I was able to compile this sketch in Processing 3.0, it threw out a list of Java-related errors when I tried to start it(Enough to remind me why I'll go so far out of my way to avoid Java)...

  So that leads to my question...  Would it be possible to plot point clouds from an Arduino i2c/serial port using ODM in place of Processing?

http://cribstone.github.io/about/

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