Glossary for Geospatial Science

bubble:  A small island (often just a cell or two) of background color in the stream of a thinned, binary line in a raster.  Bubbles are artifacts of the thinning process and result from binary lines that include unnoticed cells of the background color after thresholding.  Bubbles must be repaired by raster editing or else the automatic vectorization process will create small, incorrect polygon elements from them.