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<div dir="ltr">Hi Brian,</div>
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<div dir="ltr">In our group, we’ve been doing SfM to create virtual outcrops to look at and extract quantitative information about geologic structures. We had been using a DJI drone, but we just got a Skydio one for some of the reasons mentioned; in addition,
it is very easy to fly and has really nice built-in obstacle avoidance that ensures no collisions—especially helpful around trees and cliffy outcrops. We use DroneDeploy to plan our acquisitions, Agisoft Metashape to process SfM, and CloudCompare for most
postprocessing (but some in Matlab too). We also just got a set of Emlid Reach RTK instruments to get ~10 cm accuracy on ground control points; I went to a UNAVCO workshop to learn how to use them and they are pretty easy, but I am not an expert with them
yet; you are welcome to come check them out and see what you think! They were way less expensive than Trimbles, and seem to work great for the scale that we need, which is similar to your applications as well. We had been thinking about testing out our new
setup locally on a fissure and would love to coordinate with you all on that if that would work out! Happy to discuss more,<span></span></div>
<div dir="ltr">Best regards,</div>
<div dir="ltr">Amanda </div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif"><b>From:</b> UAS <uas-bounces@list.cals.arizona.edu> on behalf of Gootee, Brian F. - (bgootee) <bgootee@arizona.edu><br>
<b>Sent:</b> Wednesday, July 27, 2022 6:03 PM<br>
<b>To:</b> Joe Wagner (FCD) <Joe.Wagner@Maricopa.Gov>; Gillan, Jeffrey Kent - (jgillan) <jgillan@arizona.edu>; Rahr, Matt - (rahr) <rahr@ag.arizona.edu>; Beers, Rebecca - (rebeccabeers) <rebeccabeers@arizona.edu>; uas@list.cals.arizona.edu <uas@list.cals.arizona.edu><br>
<b>Subject:</b> Re: [UAS] DJI drones vs American drones
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Joe and Jeffrey, </p>
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Many thanks for the excellent perspectives Joe. When I used to attend ASLD UAS group I remember you always had a ton of useful information as you do here. I’ll definitely look into those other products and systems. I’ve always wanted to use or hear of others
using the AeroPoints. I presume post-processing or processing fees apply every time you need them. No need to reply since I can look into that. I’m pretty stoked to look into other aircraft. I agree, the trajectory of DJI doesn’t look good.
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For context we typically survey post-fire and pre-debris flow changes, or at least we’d like to do both but haven’t done too many change studies. Mostly we’ve used the onboard GPS to do dirty scans, but try use hand-placed GCP targets surveyed by Trimble d-GPS
units, fly and then post-process with Agisoft Metashape. Our Trimble GeoXH units are dying and probably won’t last til the end of this year, but those units are too precise for our needs (10-20 mm) and are very costly to replace. At the end of the day we would
be fine with ~10 cm field accuracy for most of our projects (landslides, earth fissures, fire scars, geomorphic features). Most of our projects are quite remote and rugged and usually less than 1 km2 but as large as 2x4 km. So RTK alone with occasional GCP
may work but we’ve never used RTK. We have about 300,000 km on a DJI P4P and it’s still going, but they can’t last forever so we’re looking to replace/augment it.
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That said, Joe if you do have any PowerPoint slide decks that address the scope of our needs that would be very helpful for Becky and I. We are the two pilots at AZGS.
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Jeff, if you have time tomorrow I’d like to take you up on the offer to chat over the phone?
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Kind regards, Brian</p>
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<span style="color:black">Brian F. Gootee</span></p>
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<span style="color:black">Research Geologist, P.G. | Basin Analysis | Geologic Mapping | Tribal Liaison</span></p>
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<a href="http://azgs.arizona.edu/" target="_blank"><b><span style="color:#002060; text-decoration:none">Arizona Geological Survey</span></b></a><span style="color:black"> |
</span>University of Arizona</p>
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<a href="mailto:bgootee@email.arizona.edu" target="_blank"><span style="color:#0563C1">bgootee@arizona.edu</span></a>
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<b>From:</b> Joe Wagner (FCD) <Joe.Wagner@Maricopa.Gov> <br>
<b>Sent:</b> Wednesday, July 27, 2022 4:53 PM<br>
<b>To:</b> Gillan, Jeffrey Kent - (jgillan) <jgillan@arizona.edu>; Gootee, Brian F. - (bgootee) <bgootee@arizona.edu>; Rahr, Matt - (rahr) <rahr@ag.arizona.edu>; Beers, Rebecca - (rebeccabeers) <rebeccabeers@arizona.edu>; uas@list.cals.arizona.edu<br>
<b>Subject:</b> [EXT]RE: DJI drones vs American drones</p>
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<p align="center" style="text-align:center"><strong><span style="font-family:"Calibri",sans-serif; color:red">External Email</span></strong></p>
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Brian,</p>
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Good afternoon. The Flood Control District currently uses DJI products for our design projects. We use Bentley ContextCapture and ESRI Drone2Map for SFM processing. Drone2Map is a backup and not used very often. We have our surveyor set ground control and I
use the Propeller AeroPoint GPS mats. These GPS targets are extremely helpful when flying in remote areas where typical photo id ground control is hard to find or there is no time for a surveyor to set targets. Very accurate and very easy to use.</p>
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As far as DJI, I will never purchase another DJI product, here at work or for personal use. They are absolutely wonderful aircraft and I work them hard in 105+ degrees heat. I wholeheartedly agree with the federal government crackdown and have been unhappy
with their involvement in Ukraine.</p>
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My next purchase will be a fixed wing aircraft – Quantum Systems Trinity F90+ or the Wingtra One GEN II. My wife flies drone for The National Weather Center and NOAA and uses the Trinity F90+ and loves it. She and I both have been looking for drones comparable
to DJI and they are hard to find. I’m not impressed with the Skydio 2 system. It doesn’t seem as functional as the Mavic systems.</p>
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I have several projects that I have used to present a PowerPoint presentation to local folks. If you like I can ftp them to you to look over.</p>
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Sincerely,</p>
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<b><span style="color:#1F497D">Joseph G. Wagner</span></b></p>
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<span style="color:#1F497D">Mapping, Surveying, and CAD Manager</span></p>
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<span style="color:#1F497D">Drone Program Manager</span></p>
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<span style="font-size:9.0pt; color:#1F497D"> </span></p>
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<a href="http://www.fcd.maricopa.gov/"><span style="color:#1F497D; text-decoration:none"><img border="0" width="72" height="72" id="Picture_x0020_1" src="cid:image001.png@01D8A1E1.01DA31E0" alt="FCD" style="width:.75in; height:.75in"></span></a><span style="color:#1F497D"></span></p>
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<b><span style="color:#1F497D">Flood Control District of Maricopa County</span></b></p>
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<span style="color:#1F497D">2801 W Durango St, Phoenix, AZ 85009</span></p>
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<span style="color:#1F497D">(O) 602-506-2203 (C) 623-297-2638</span></p>
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<span style="color:#1F497D"><a href="mailto:Joe.wagner@maricopa.gov">Joe.wagner@maricopa.gov</a></span></p>
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<a href="http://www.maricopa.gov/floodcontrol">www.maricopa.gov/floodcontrol</a><span style="font-size:9.0pt; color:#1F497D"></span></p>
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<b>From:</b> UAS <<a href="mailto:uas-bounces@list.cals.arizona.edu">uas-bounces@list.cals.arizona.edu</a>>
<b>On Behalf Of </b>Gillan, Jeffrey Kent - (jgillan)<br>
<b>Sent:</b> Wednesday, July 27, 2022 3:57 PM<br>
<b>To:</b> Gootee, Brian F. - (bgootee) <<a href="mailto:bgootee@arizona.edu">bgootee@arizona.edu</a>>; Rahr, Matt - (rahr) <<a href="mailto:rahr@ag.arizona.edu">rahr@ag.arizona.edu</a>>; Beers, Rebecca - (rebeccabeers) <<a href="mailto:rebeccabeers@arizona.edu">rebeccabeers@arizona.edu</a>>;
<a href="mailto:uas@list.cals.arizona.edu">uas@list.cals.arizona.edu</a><br>
<b>Subject:</b> Re: [UAS] DJI drones vs American drones</p>
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<span style="font-family:"inherit",serif">Hi Brian, </span></p>
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<span style="font-family:"inherit",serif">I have a lot of experience surveying terrain with drones using RTK and ground control methods. I would be happy to chat with you any time about it. In general, RTK is fantastic but best referencing practices could depend
on your specific application. I have recently done some drone stuff with Ann Youberg on Mt. Lemmon. </span></p>
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<span style="font-size:12.0pt; color:black">Jeff Gillan, Ph.D. </span></p>
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<span style="font-size:12.0pt; color:black">Data Scientist III | Drone Pilot</span></p>
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<span style="font-size:12.0pt; color:black">School of Natural Resources & Environment</span></p>
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<span style="font-size:12.0pt; color:black">University of Arizona</span></p>
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<span style="font-size:12.0pt; color:black">gillanscience.com</span></p>
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<a href="tel:(530)339-5975"><span style="font-size:12.0pt">(530)339-5975</span></a><span style="font-size:12.0pt; color:black"></span></p>
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<b><span style="color:black">From:</span></b><span style="color:black"> UAS <</span><a href="mailto:uas-bounces@list.cals.arizona.edu">uas-bounces@list.cals.arizona.edu</a><span style="color:black">> on behalf of Gootee, Brian F. - (bgootee) <</span><a href="mailto:bgootee@arizona.edu">bgootee@arizona.edu</a><span style="color:black">><br>
<b>Sent:</b> Wednesday, July 27, 2022 3:40 PM<br>
<b>To:</b> Rahr, Matt - (rahr) <</span><a href="mailto:rahr@ag.arizona.edu">rahr@ag.arizona.edu</a><span style="color:black">>; Beers, Rebecca - (rebeccabeers) <</span><a href="mailto:rebeccabeers@arizona.edu">rebeccabeers@arizona.edu</a><span style="color:black">>;
</span><a href="mailto:uas@list.cals.arizona.edu">uas@list.cals.arizona.edu</a><span style="color:black"> <</span><a href="mailto:uas@list.cals.arizona.edu">uas@list.cals.arizona.edu</a><span style="color:black">><br>
<b>Subject:</b> Re: [UAS] DJI drones vs American drones</span> </p>
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Matt, </p>
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Nice to know about the pursuit for DJI drones is continuing. Their hardware and software are really good and stand up to time well.
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In addition we wonder who else is using structure-from-motion to build DEMs and what methods for georeferencing they are using. The purchase of a new drone with or without RTK and a GPS system are what is relevant to us here.
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Many thanks for your help. Brian</p>
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<span style="color:black">Brian F. Gootee</span></p>
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<span style="color:black">Research Geologist, P.G. | Basin Analysis | Geologic Mapping | Tribal Liaison</span></p>
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<a href="http://azgs.arizona.edu/"><b><span style="color:#002060; text-decoration:none">Arizona Geological Survey</span></b></a><span style="color:black"> |
</span>University of Arizona</p>
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<a href="mailto:bgootee@email.arizona.edu"><span style="color:#0563C1">bgootee@arizona.edu</span></a>
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<b>From:</b> Rahr, Matt - (rahr) <<a href="mailto:rahr@ag.arizona.edu">rahr@ag.arizona.edu</a>>
<br>
<b>Sent:</b> Wednesday, July 27, 2022 3:03 PM<br>
<b>To:</b> Beers, Rebecca - (rebeccabeers) <<a href="mailto:rebeccabeers@arizona.edu">rebeccabeers@arizona.edu</a>>;
<a href="mailto:uas@list.cals.arizona.edu">uas@list.cals.arizona.edu</a><br>
<b>Cc:</b> Gootee, Brian F. - (bgootee) <<a href="mailto:bgootee@arizona.edu">bgootee@arizona.edu</a>><br>
<b>Subject:</b> RE: DJI drones vs American drones</p>
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Hey Rebecca and Brian,</p>
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Let’s ask the UAS User Group. We just bought a DJI Mavic 3 and have two other DJI drones, and agree, they’re great for the price.
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<b>From:</b> Beers, Rebecca - (rebeccabeers) <<a href="mailto:rebeccabeers@arizona.edu">rebeccabeers@arizona.edu</a>>
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<b>Sent:</b> Wednesday, July 27, 2022 12:31 PM<br>
<b>To:</b> Rahr, Matt - (rahr) <<a href="mailto:rahr@ag.arizona.edu">rahr@ag.arizona.edu</a>><br>
<b>Cc:</b> Gootee, Brian F. - (bgootee) <<a href="mailto:bgootee@arizona.edu">bgootee@arizona.edu</a>><br>
<b>Subject:</b> DJI drones vs American drones</p>
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<span style="font-size:12.0pt; color:black">Hi Matt,</span></p>
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<span style="font-size:12.0pt; color:black">This is Rebecca Beers at the AZ Geological Survey. My colleague (Brian-copied) and I are curious if the University has a recommendation on an American-made drone? We are looking to purchase a new drone for our department,
but I remember an email coming out a while ago stating that the University may not allow Chinese-made drone (DJI) in the future over concerns of metadata leaks. Have you heard anything else on this? We really like our seamless functionality of DJI, but we
are curious if you have found any American-made drones with similar capabilities as the DJI drones? Or has the University stepped back on the concerns of DJI metadata leaks?</span></p>
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<span style="font-size:12.0pt; color:black">Thank you, and we appreciate any guidance you have on this,</span></p>
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<span style="font-size:12.0pt; color:black">-Becky</span></p>
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<span style="font-size:12.0pt; color:black">Rebecca Beers</span></p>
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<span style="font-size:12.0pt; color:black">Research Geologist III</span></p>
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<span style="font-size:12.0pt; color:black">Arizona Geological Survey,</span></p>
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<span style="font-size:12.0pt; color:black">University of Arizona</span></p>
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<a href="http://www.azgs.arizona.edu" title="www.azgs.arizona.edu"><span style="font-size:12.0pt">www.azgs.arizona.edu</span></a></p>
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<a href="mailto:rebeccabeers@email.arizona.edu"><span style="font-size:12.0pt">rebeccabeers@email.arizona.edu</span></a></p>
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