The output coverage tics are copied from the input coverage. New nodes have their attributes set to zero. If a node attribute table (NAT) exists before ERASE, then it remains afterward for those nodes that survive the ERASE. Region subclasses in the erase coverage are not inherited. Regions in the input coverage are erased in the output coverage by the extent of the erase coverage. Region subclasses in the input coverage are maintained with the POLY option. ERASE maintains all route system subclasses. Route systems are duplicated for arcs split into multiple pieces and eliminated for eliminated arcs. Route systems will be rebuilt for LINE, NET, LINK, and RAW options but ignored on the POLY option. The output coverage remains identical to the input coverage. If the LINE option is used, then nothing extra is added. An extra polygon is inserted in the output coverage, as defined by the outline polygon of the erase coverage, and given a label point with a User-ID = 0. If the erase coverage polygon happens to fall completely within an input polygon, then no polygons are erased. Any erase coverage polygon with an internal number greater than one is considered inside the erasing window an internal polygon number of one is considered outside. The outside boundaries of the erase coverage define the area of Input coverage features to be removed. Only those input features (or portions of them) that are outside the erasing region are stored in the output coverage. Any erase coverage polygon whose internal number is greater than one is considered inside the erasing window an internal polygon number of one is considered outside. Each old polygon keeps its original label point position if it falls outside an erase coverage polygon.īoundaries of interior polygons in the erase coverage are not used in ERASE. Whenever possible, input polygon label points are preserved in the output. User-IDs for all features are the same in the output coverage as they are in the input coverage.įor the POLY and NET options, polygon topology is rebuilt in the output coverage. The erase coverage must have polygon topology.

Input coverage polygons that are coincident with erase coverage polygons are removed. The output coverage cannot already exist.Īnnotation is erased if its lower left starting point falls within the erasing polygon. Learn more about how Erase works Illustration Erase example Usage Only those portions of the input coverage features falling outside the erase polygon outer boundaries are copied to the output coverage. Creates a new output coverage by overlaying the polygons of the erase coverage with the features of the input coverage.

Erase raster with polygons