Robotic mapping


Robotic mapping

The problem of Robotic mapping is related to cartography.The goal is for an autonomous robot to be able to construct (or use ) a map or floor plan and to localize itself in it.

Todd et al (1994) have shown that evolutionarily shaped blind action may suffice to keep some animals alive. For some insects for example, the environment is not interpreted as a map, and they survive only with a triggered response.

But a slightly more elaborated navigation strategy dramatically enhances the capabilities of the robot. Cognitive maps (Tolman 1948) enable planning capacities, and use of current perceptions, memorized events, and expected consequences.

A good algorithm in robotic mapping may combine the information from the past, the present and the future (Trullier et al. 1997).

The problem can be decomposed in three processes (Levitt and Lawton 1990 ; Balakrishnan et al. 1999) : map learning, localisation, path-planning.

Available information

The robot has two sources of information: the idiothetic and the allothetic sources.

When it moves, the robot integrates its position by counting the number of wheel turns it has done. This corresponds to the idiothetic source. It can give the absolute position of the robot. But it is subject of cumulative error which can grow fast.

The allothetic source corresponds to the sensors of the robot, like a camera, a microphone, laser, sonar, ... The problem is the "perceptual aliasing". This means that two different places can be perceived the same. For example, in a building, you can't know where you are only with the visual information, because all the corridors look the same.

Map representation

The internal representation of the map can be "metric" or "topological":

*The metric framework is the most common for humans and considers a two dimensional space in which it places the objects. The objects are placed with precise coordinates. This representation is very useful, but is sensitive to noise and it is difficult to calculate precisely the distances.

*The topological framework only considers places and relations between them. Often, the distances between places are stored. The map is then a graph, in which the nodes corresponds to places and arcs correspond to the paths.

Many techniques use probabilistic representations of the map, in order to handle uncertainty.

There are three main methods of Map representations:

Free Space Maps

*Spatial graphs
*Voronoi diagrams
*Generalised Voronoi Diagrams

Object Maps

Composite Maps

*Point grids
*Area grids
*Quad trees

These employ the notion of a grid, but permit the resolution of the grid to vary so that it can become finer where more accuracy is needed and more coarse where the map is uniform.

Map learning

Map-learning can't be separated from the localization process so it is difficult because errors in localization are incorporatedinto the map. This problem is commonly referred to as Simultaneous localization and mapping (SLAM).

An important additional problem is to determine whether the robot is in a part of environment already stored or never visited, that can be solved, i.e., using electric beacons.

Path planning

The path planning problem is not an important issue if the map (or floorplan) and localization are accurate [citation required]

For the metric representation of the map, the robot can find short cuts in the map.

For the topological representation, the problem of path planning is a classical problem of finding the shortest path between two nodes in a graph.

Robot navigation

Outdoor robots can use GPS in a similar way to automotive navigation systems.

Alternative systems can be used with floor plan instead of maps for indoor robots, combined with localization wireless hardware.

Electric beacons also has been proposed for cheap robot navigational systems.

See also

* Automotive navigation system
* CARMEN, a robot mapping package.
* Domestic robot and indoor transport.
* Electric beacon
* Floor plan
* GPS
* Map database management
* Maze Simulator
* PatrolBot
* Robotics suite
* Occupancy grid

External links

* [http://sky.fit.qut.edu.au/~taylort2/MRS/ Maze Simulator] .
* Mobile robot navigation:
** [http://www.roboticsindia.com/modules.php?name=News&file=article&sid=48 Robotics India] .
** [http://www.doc.ic.ac.uk/~nd/surprise_97/journal/vol2/jmd/ Issues in Practical Implementation] .
** [http://www.geckosystems.com/industries/cognizant_navigation.php Cognizant navigation]
** [http://www.arxiv.org/pdf/cs.RO/0601053 Wavefront Propagation and Fuzzy Based Autonomous Navigation]
** [http://www.ikalogic.com/wfr.php A comprehensive tutorial on robot navigation]
** [http://www.sccs.swarthmore.edu/users/06/adem/engin/e28/labs/lab1/ Wall-following]
* [http://mecca.louisville.edu/~msabry/projects/robot.htm PDE based Robotic Navigation]

* Floorplan mapping:
** [http://www.earlham.edu/~rodrimi/school_work/robot_learning.htm Robot learning and floorplan mapping]
** [http://www.robotmaker.co.uk/Index_research_development_v1.htm Floorplan mapping using radio modem] .
** [http://www.diversity.co.uk/GridSlam.html Diversity Grid SLAM Explorer]
* Electric beacons in robot navigation:
** [http://www.mil.ufl.edu/publications/fcrar00/meiszer.pdf An Accurate and Cheap Navigation System for Robots] , using sonar beacons.
** [http://www.spawar.navy.mil/robots/pubs/spie4195b.pdf Minimum-resource distributed navigation and mapping] , using IR beacon.
** [http://www.nosc.mil/robots/research/manyrobo/navabstract.html Light beacons] .
** [http://robotag.carleton.ca/resources/technical/ir_beacon.shtml Infrared beacons]
** [http://www.ee.ryerson.ca:8080/~phiscock/thesis/robot-beacons/adil-jaffer.asm Demonstration routine for a robot utilizing active beacons] .
* [http://www.ai.sri.com/~gerkey/roomba/index.html Robotic mapping] for Roomba.


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Robotic surgery — A robotically assisted surgical system used for prostatectomies, cardiac valve repair and gynecologic surgical procedures Robotic surgery, computer assisted surgery, and robotically assisted surgery are terms for technological developments that… …   Wikipedia

  • Simultaneous Localization and Mapping — Das SLAM Verfahren (englisch Simultaneous Localization and Mapping ‚Simultane Lokalisierung und Kartenerstellung‘) ist eine Methode, bei dem ein mobiler Roboter oder ein Software Agent gleichzeitig eine Karte seiner Umgebung erstellen und… …   Deutsch Wikipedia

  • Occupancy grid mapping — refers to a family of computer algorithms in probabilistic robotics for mobile robots which address the problem of generating maps from noisy and uncertain sensor measurement data, with the assumption that the robot pose is known. The basic idea… …   Wikipedia

  • List of robotic dogs — Robotic dogs are robots designed to resemble dogs in appearance and behavior, usually incorporating canine characteristics such as barking or tail wagging. In addition, many such dogs have appeared as toys and in fiction.Military*BigDog is a… …   Wikipedia

  • Simultaneous localization and mapping — A robot built by Technische Universität Darmstadt maps a maze using a LIDAR …   Wikipedia

  • Lunar Precursor Robotic Program — The Lunar Precursor Robotic Program (LPRP) is a program of robotic spacecraft missions which NASA will use to prepare for future human spaceflight missions to the Moon. [cite web | url = http://moon.msfc.nasa.gov/ | title = Lunar Precursor… …   Wikipedia

  • Multi Autonomous Ground-robotic International Challenge — Left to right: 1st Team Michigan,2nd U. Penn,3rd RASR,4th MAGICian WAMbot,5th Cappadocia The Multi Autonomous Ground robotic International Challenge (MAGIC) is a 1.6 million dollar prize competition for autonomous mobile robots funded by TARDEC… …   Wikipedia

  • Domestic robot — First generation Roomba vacuums the carpets in a domestic environment Contents …   Wikipedia

  • Mobile robot — A mobile robot is an automatic machine that is capable of movement in a given environment. A spying robot is an example of a mobile robot capable of movement in a given environment. Courtesy: Gaurav Mittal, PEC[1] Contents …   Wikipedia

  • Topic outline of robotics — Robotics is the science and technology of designing, making, and applying robots, including theory from many contributing fields. A robot is a mechanical or virtual, artificial . It is usually an electromechanical system, which, by its appearance …   Wikipedia