Brett Baker

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Posts posted by Brett Baker

  1. 2 hours ago, Av8Chuck said:

    Some things to keep in mind and that you might want to check out.  Take a look at this drone: https://www.microdrones.com/en/mdaircraft/md4-1000/  This drone costs approximately $65K  I'm suggesting that you buy it but that's what it costs to get the level of accuracy required to certify aerial data.  In part, because it uses instrumentation like https://www.applanix.com/products/dms-uavs.htm, a $15K IMU and more expensive L1 and L2 GPS receivers etc.

    If your career or your customer's career depends on your ability to certify aerial data then you need to seriously consider whether a drone with off the shelf 5hz GPS, an IMU that was developed to be used in a cell phone and a sub $2K "RTK" base station will provide you with the data you can trust.

    Also, the majority of the Photogrammetry software is based on on the same white papers from about 15 years ago which is why most of its all the same.  There are primarily two types, Pix4D which is predominantly used for NADIR and ContextCapture which is used for Oblique scanning.  One is better for farming the other is better for engineering.   

    Here's a scan we did of Glendale http://realitymodeling-pw.bentley.com/a3D/Construct Timelapse/models/4-12/App/?scene=http://realitymodeling-pw.bentley.com/a3D/Glendale/Production_1/Scene/Production_1.3mx#%2F  using ContextCapture.  This is a project where a dignitary was going to speak and law enforcement wanted to determine snipper angles, parade routes, evacuation routes, etc., so certification of the data wasn't required.  For the amount of space and the vertical nature of the scan, NADIR would not have been nearly as effective as Oblique. 

    I'm not a civil engineer so I know very little about most of the terrestrial based tools, but we've been working with Bentley Systems and a few large engineering firms and have tested a ton of "solutions."  As much as people want to believe that things like SiteScan, DroneDeploy, and DJI have they answer if you want certifiable data, they aren't.   

    Depending on what problem you're trying to solve do you really want to potentially jeopardize your career using a 16MP camera, carried on a toy and controlled by a cell phone app?  As much as the idea of cloud computing and having the model rendered before your back to your desk sounds sexy, there are way too many holes in that value chain that you should not trust. 

     

    Impressive model!  Do you know if there is any downside to using ContextCapture in nadir mode of data collection?  I am looking more for a both hands on wheel type of a software solution as opposed to a black box that does some of the decision making on its own.

  2. Hello All,

    Just joined.  I am an engineering geologist and I work on dam safety in CA.  We have 11 earthen dams, one of which straddles an actively creeping fault (about 1/2 inch / yr).  We also have a large facility on an active landslide.  So lots to keep me busy.  Am in the process of acquiring a drone and sensors (LiDAR, cameras) and processing software and a right sized pc that doesn't keep me waiting for deformation monitoring and geological mapping.  Trying to make the right decisions now to hopefully save me headache down the road.  I've just joined and I've already gotten some great feedback from members.  I started surveying in high school, worked as an underground mine surveyor, a seismic surveyor in Latin America, scuba instructor in the Bahamas and Haiti, geologist for the USGS, geodetic engineer for UNAVCO, several roles for Trimble and SiRF and now engineering geologist.  I've got 2.5 kids (ok a dog) and a live in a nice home the bank owns!  Thanks!  

  3. Thanks for the great info!  Microdrones have already been out to visit us and collected some test data.  They are going to return soon and do it again.  We are also looking at PulseAero Vapor55.  Yeah, the money adds up fast.  Our driving force is safety, deformation monitoring.  We have several earthen dams that don't meet today's standards for seismic stability.  One straddles a creeping fault (14mm/yr).  I spoke with a gentleman from southern Utah who told me he prefers ContextCapture over Pix4d.  I think he said he did some comparisons between the two and found he got better results with the Bentley product.   We will probably base most of our work on lidar data but we also have projects where the imaging is required.  For the LiDAR we are looking at the Reigl VUX-1.

  4. Hello All,

    I am new to this thread but am interested if anyone has done a comparison of the pro's and con's of the different photogrammetry software packages available?  To be honest I haven't read this thread in it's entirety so I apologize if I missed it here.  

    My criteria are fast and accurate.  I am using it for deformation monitoring of earthen dams.  I may use Structure from Motion processing as well as LiDAR data sets.

    I've looked at Trimble Inpho, Agisoft Photoscan, Pix4D, Context Capture (Bentley), and SimActive's 3D Correlator.

    Thanks!

    Brett