<div dir="ltr">We're using DJI Mavic ($1000), Pix4D Capture application and Pix4D ($300/mo) to get orthorectified imagery in Belarus. It takes 1 battery, 20 minutes of flight time and several hours processing to get 1x1 km chunk in 6 cm/px. <br><br>Sample: <a href="https://cloud.pix4d.com/pro/project/169316?shareToken=9fda4c2a6fc64b938886d3f4fa477692" target="_blank">https://cloud.pix4d.com/pro/project/169316?shareToken=9fda4c2a6fc64b938886d3f4fa477692</a> <br><br>DSM and 3D is also generated.<br><br>We upload it to OpenAerialMap. There are some issues in their pipeline that make imagery not very crisp:<br><a href="https://github.com/hotosm/oam-dynamic-tiler/issues/49">https://github.com/hotosm/oam-dynamic-tiler/issues/49</a> <br><div><br></div><br><div class="gmail_quote"><div dir="ltr">пт, 1 сент. 2017 г. в 18:42, Oleksiy Muzalyev <<a href="mailto:oleksiy.muzalyev@bluewin.ch" target="_blank">oleksiy.muzalyev@bluewin.ch</a>>:<br></div></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div text="#000000" bgcolor="#FFFFFF">
<div class="m_-5570420093948672887m_8074556336674721192moz-cite-prefix">On 9/1/2017 5:12 PM, Martin
Koppenhoefer wrote:<br>
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<div class="gmail_extra"><br>
<div class="gmail_quote">2017-09-01 16:24 GMT+02:00 Oleksiy
Muzalyev <span dir="ltr"><<a href="mailto:oleksiy.muzalyev@bluewin.ch" target="_blank">oleksiy.muzalyev@bluewin.ch</a>></span>:<br>
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<p> But the advantage is that it weighs only 300 grams,
very portable, and it is ready to fly almost instantly
as folding propellers are fixed permanently, and
smart-phone connects to the remote control via WiFi,
no cables are necessary.</p>
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<div class="gmail_extra"><br>
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<div class="gmail_extra"><br>
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<div class="gmail_extra">did you try how high/far you can get
before loosing the wifi connection?</div>
<div class="gmail_extra"><br>
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<div class="gmail_extra">Cheers,</div>
<div class="gmail_extra">Martin<br>
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</div><div text="#000000" bgcolor="#FFFFFF"><p>Hello Martin and James,</p>
<p>In this case was talking about Wi-Fi connection between
smart-phone where runs DJI Go 4 app and the remote control radio,
they remain close to one another all the time. But certainly the
flight range of Spark is not as great as the one of the Phantom. <br>
</p>
<p>There is a list of compatible smart-phones for the Spark at the
very bottom of this page: <a class="m_-5570420093948672887m_8074556336674721192moz-txt-link-freetext" href="http://www.dji.com/spark/info#specs" target="_blank">http://www.dji.com/spark/info#specs</a> . I
read at the DJI forum that if one uses such a smart-phone the
range is better.</p>
<p>I flew Spark maximum about 700 meters away and 150 (legal limit
for the region) meters high. The video & control signals was
present all the time, though my old smart-phone is not in the
list. I ordered already a compatible one.</p>
<p>For me this range is OK. The best aerial photos are made from the
altitude of 70 - 100 meters anyway, and besides in accordance with
the regulations it is allowed to fly only LoS (line-of-sight)
anyway (unless there is a special license).</p>
The Spark remote controller has got folding outside antennas, so the
range of several hundred meters, or I would guess up to 1 - 1.2 km,
is probably due to these antennas. The range of the Phantom is more
than 2 km.<br>
<br>
Best regards,
<p>Oleksiy<br>
</p>
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