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Drones Could 3D-Map Scores of Hectares of Land In Just a Few Hours
sciencehabit writes: Unmanned drones aren't just for warfare. In recent years, they've been used to map wildlife and monitor crop growth. But current software can't always handle the vast volume of images they gather. Now, researchers have developed an algorithm that will allow drones to 3D-map scores of hectares of land in less than a day — an advance that is important for cost-effective farming, disaster relief, and surveillance operations.
Their computer program directly projects the points from each photo onto a 3D space without knowing the exact shape of the land or the camera positions. As a result, the tie points don't necessarily match up, which means the same corn plant can have two projections on the model. When that happens, the algorithm automatically takes the middle point between the two projections as the more accurate location and adjusts the camera position accordingly, one image at a time. Because the algorithm tweaks far fewer things at each step, the shortcut drastically speeds up calculations. Once the software has adjusted the camera positions for all the photos, the software repeats the entire process — starting from projecting the points to the 3D space — to correct for any errors.
Their computer program directly projects the points from each photo onto a 3D space without knowing the exact shape of the land or the camera positions. As a result, the tie points don't necessarily match up, which means the same corn plant can have two projections on the model. When that happens, the algorithm automatically takes the middle point between the two projections as the more accurate location and adjusts the camera position accordingly, one image at a time. Because the algorithm tweaks far fewer things at each step, the shortcut drastically speeds up calculations. Once the software has adjusted the camera positions for all the photos, the software repeats the entire process — starting from projecting the points to the 3D space — to correct for any errors.
Scores of Hectares? Really guys?
Why, with our revolutionary fly-a-micating devices, which are capable of travelling at dozens of furlongs per fortnight, we will be able to monitor the Aether, and map the location of the peasants houses to within a few rods, thus ensuring we can maximize tithing.
A spokesman for the government was overcome with the vapors at the excitement of it all, and needed to be leeched lest her spleen overtake the rest of her humors and leave her dyspeptic and the evil spirits sway her from her normal temperament.
Off the record, a spokesman was hopeful that the new phrenology module would be available in version III.V, and evil people will be easily spotted from the air, and can then be rounded up for burning at the stake.
Goode Frye was optimistic this would remove the threat of the witches which have been stealing the souls of babies.
Lost at C:>. Found at C.
Depending on the accuracy obtained, such mapping would be highly useful on our farm for figuring out drainage. Some areas of a field might drain better with only a very small slope, if we knew where to put the channel. Currently the only real option is to drive over the field with an RTK GPS receiver and make a GIS map of elevations. Which works well enough (depending on the grid resolution; can get really old driving every 10 feet over 160 acres), but takes quite a long time to do.
Talking with a large farm owner over the weekend who is ready to start using Drones to cover about 5500 acres as a supplement to their current sat. imagery. They were told no by the FAA, which says they will not be able to accommodate farming drones until 2016 at the earliest.
So instead of figuring out how it's going to benefit the farmer and working through the leading edge adoption issues with farms who are motivated to give it a try, they are regulating them out of existence, before it can even get started.
I can certainly understand the need for regulations as problems arise, but to write the regulations before there is an issue is just a typical stupid gov response. The FAA will make the entire process more expensive, more cumbersome and more restrictive than it needs to be without any real world experiences upon which to regulate.
It would be simple to set a weight, height and radius limit for farming drone use. Could be done in just a couple of days with 2-3 smart people but that is just too easy for gov work.
TFA states that the old algorithm breaks down once the number of source images exceeds a few hundred, at which point it can take thousands of hours to process. The new algorithm can accommodate over a thousand images and process them all in about four hours.
John