TLV3D

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TLV3D

The idea - to map TLV in 3D using any means possible.

We maintain the data on official TAMI superclusters and release it as emperors of the digital realm.

Alon translation: open data map of Tel Aviv (same license as openstreetmaps).

what already exists

Under open licenses (CC / other)

http://openslam.org/ seems to be parking space for slam projects - so far haven't found any full solutions here.

point cloud library http://docs.pointclouds.org/trunk/a02944.html

Other not open licenses

metroscape has 3d models of a few tens of bldgs in tlv

  • requires windows/mac for the plugin, and no download link for any model (STL/other). -- Alon

googleearth has also a few tens of tlv buildings

Googeearth.jpg

will google come and nail it all down ? if we scoop them we get to ride in the google helicopter.

how to

The 3d scanners such as mantis and kinect are apparently not set up for long ranges like 10-50m which is what we're after to get buildings. Satellite photos probably are not of help here due to shallow angles and probable closed source-ness. A quadcopter may be of use but would take massive time and batteries. Rough order of magnitude of the problem:

one street every 50m

about 20km^2 of area in TLV

--> 800 km of street in TLV

--> a car / bike mounted 3d scanner is needed.

photogeometry

from several cameras with known relative angles and baseline, reconstruct 3d info using known algorithms

structured light

try to obtain 3d info from a large-ified kinect hack

it is possible to build a massive structured light rig, using a 3000+ ansi projector and a DSLR.
see here > https://code.google.com/p/structured-light/

15000ansi projector - its 100nis per 1000 lumans per day i tried that method and it works well, but you can't be moving to much. you need to hit the same geometry 3 times with different "binary" patterns.

stereo (camera + laser, use parallex) maker scanner

an opensource diy scanner here

Time of Flight

Cheap LiDARs (relatively) @Hokuyo

  • 10m distance (this model, there are others, maybe 30m? also indoors/outdoors differs)

VL6180 by ST.

Structure from Motion (SfM)

Wikipedia article.

Not necessarily with an IMU, just a camera.

Hardware

Cameras

Map Stitching


Monocular Slam

Monocular is a code word for a single camera, here is a list of algorithms, software has still not been tested.

Input is a bunch of camera images, offline or online (we don't need online, but a lot of the algorithms are developed for real time augmented reality applications).

Google: SLAM with camera