The study of change using conditional morphological operators

This paper presents a case study on the dynamics of Ambrosia artemisiifolia populations in the surroundings of Trois-Rivieres (Canada) that will enable the authors to demonstrate the validity of their arguments on a new procedure for change detection. Ambrosia artemisiifolia (common ragweed) is a very common and abundant annual plant in the open spaces of Northeastern America. The pollens emitted by this plant are the principal cause of hay fever Eastern Canada, Ambrosia artemisiifolia is also causing, as a bad plant, decreasing yields in many agricultural industries through invasion of prairies and cultivated land. It is interesting to study the evolution of Ambrosia artemisiifolia populations under the urban dynamics angle since these populations are almost always linked to changes in vegetal covers and land use caused by human activities