Insert 3-D points or point cloud observation into map
inserts one or more sensor observations at the given
in the occupancy map,
map3D. Occupied points are updated
with an observation of 0.7. All other points between the sensor
points are treated as
obstacle-free and updated with an observation of 0.4. Points outside
maxrange are not updated.
occupancyMap3D object stores obstacles in 3-D space, using sensor observations to map an environment. Create a map and add points from a point cloud to identify obstacles. Then inflate the obstacles in the map to ensure safe operating space around obstacles.
occupancyMap3D object with a map resolution of 10 cells/meter.
map3D = occupancyMap3D(10);
Define a set of 3-D points as an observation from a pose
[x y z qw qx qy qz]. This pose is for the sensor that observes these points and is centered on the origin. Define two sets of points to insert multiple observations.
pose = [ 0 0 0 1 0 0 0]; points = repmat((0:0.25:2)', 1, 3); points2 = [(0:0.25:2)' (2:-0.25:0)' (0:0.25:2)']; maxRange = 5;
Insert the first set of points using
insertPointCloud. The function uses the sensor pose and the given points to insert observations into the map. The colors displayed correlate to the height of the point only for illustrative purposes.
Insert the second set of points. The ray between the sensor pose (origin) and these points overlap points from the previous insertion. Therefore, the free space between the sensor and the new points are updated and marked as free space.
Inflate the map to add a buffer zone for safe operation around obstacles. Define the vehicle radius and safety distance and use the sum of these values to define the inflation radius for the map.
vehicleRadius = 0.2; safetyRadius = 0.3; inflationRadius = vehicleRadius + safetyRadius; inflate(map3D, inflationRadius); show(map3D)
map3D— 3-D occupancy map
3-D occupancy map, specified as a
points— Points of point cloud
Points of point cloud in sensor coordinates, specified as an
n-by-3 matrix of
[x y z] points,
where n is the number of points in the point
ptcloud— Point cloud reading
Point cloud reading, specified as a
pointCloud objects requires Computer Vision Toolbox™.
pose— Position and orientation of vehicle
[x y z qw qx qy qz]vector
Position and orientation of vehicle, specified as an
[x y z qw qx
qy qz] vector. The vehicle pose is an
xyz-position vector with a quaternion orientation vector
[qw qx qy qz].
maxrange— Maximum range of sensor
Maximum range of point cloud sensor, specified as a scalar. Points outside this range are ignored.