The use of geomatical tools in agriculture is increasing, especially to collect and manage information about yields. Moreover, some agricultural areas have to deal with animal manure management problems : in many places, hog farm expansion generates manure excess. Even if sometimes considered waste, animal manure is a good and inexpensive soil fertilizer. World-wide market development and increasing environmental constraints require careful management and use of effective tools. Geomatical tools can help the disposal of animal manure and improve its efficiency as organic fertilizer.
With respect to this objective, a potential solution using GPS and GIS tools is described. First, GPS is the most effective way to position animal manure spreadings. Different methods to process GPS data are compared and an optimal solution is suggested. Then, the resulting map should intuitively show the different manure spreadings and the overlaps between them. Some data structures are discussed and a way to produce an effective numeric map is presented. For the producer, this numeric map could be a useful spreadings register. For integrated management, the spreading informations could be inserted in a GIS with other relevant data such as soil types, topography and yields, or proximity of neighbours and water body.