International Geologiical Congress - Oslo 2008

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IEI-13 Uncertainty in GIS and 3D modelling ? approaches to quantify and represent error in interpreted digital datasets

 

Least cost path in prospecting field work with speed model related to terrain slope and land use by genetic algorithm

 

Luis Hernan Ochoa Gutierrez, Universidad Nacional de Colombia (Colombia)
Luis Joel Martinez Martinez, Universidad Nacional de Colombia (Colombia)
Luis fernando Nino Vasquez, Universidad Nacional de Colombia (Colombia)
 

 

In geophysical exploration field work, an accurate station's access paths determination has been very difficult because there are many variables involved. With an accurate determination of paths is possible to calculate costs and daily programming. Some models as least cost path, let a determination of this routes but in this models terrain slope in considered as independent of sign of this. In Those models, directions Up and Down are the same, so its not important how you move in the field. Daily experience indicates us that there is a difference. I propose here a velocity model that takes in account both direction and land use to calculate time of displacement. The fastest time between stations and the optimal route is determinate by heuristics and the daily programming is based in a genetic algorithm, that consists in a string of visited stations divided in movements between stations with no more than 8 hours and a base station included as gene divisor. Each one is evaluated by a fitness function that consists in the travel time including paths from and to base stations.

 

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