Which holds more data raster or vector gis12/11/2023 For these reasons, we aim to split a wide image into several small units and convert the raw image information into a vector of features characterizing the unit in a raster view.Īnother observation is that the vector data structures are not adapted to model fuzzy information in GIS ( Shneider, 1999). The raster information is not split into identified objects and the vector representation is more flexible and gives the possibility to be easily combined with other information layers. Indeed, the raster data are not adapted to GIS treatment ( Benz, 2004) because of a lack of contextual information, the size of the data and the time consuming algorithm to produce information. The main goal is to manipulate vector information instead of raster because their manipulation within GIS engenders many problems. Vector information is often obtained by manual measurements (using GPS receptor for example), or is the result of the vectorisation of a raster treatment (such as classification, etc.). The main sources of raster data are raw images (airborne and satellite images) and results of treatments (geostatistical, pixel classification, etc.). The use of raster information will be useful to split vector units when the vector division reaches its limits. The model will be useful to represent information such as natural phenomenon (forest, desert, geology, separation between mountain and valley, rain, inundation, wind, etc.), social phenomenon (population density changes, poverty, etc.) or physical phenomenon (hurricane, etc.), which are diffused in space ( Guesgen, 2000). This chapter deals with a vector model for fuzzy data sets within a GIS and with the raster and vector combination to refine vector objects.
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