![]() Polygon label points are not required by the Clean command but must be used if you want nonzero User-IDs for polygons. Learn more about temporary files created by geoprocessing tools You must have write access to this directory. You can override the default and have the scratch files created in another directory by setting the ARCTMPDIR variable. These scratch files are created in your current workspace by default. You must first Project your geographic coverage to a suitable projection to convert your angles of latitude and longitude using angular units to a 2D rectilinear Cartesian coordinate system using rectilinear units of Feet, Meters, Kilometers, and so on.Ĭlean requires free disk space approximately 13 times the size of your input coverage to create temporary scratch files. They represent a spherical coordinate system and should not be confused with a 2D rectilinear coordinate system upon which commands like Clean, Buffer, Union, and other overlay processes are designed to work. ![]() ![]() These units are designed to measure angles they do not measure distances. Geographic coverages have units in decimal degrees, decimal seconds, radians, and so on. Feature User-IDs do not have to be unique to ensure that each input feature keeps its attributes in the Output Coverage.ĭo not run Clean on a geographic coverage. The internal number of each Input Coverage feature is used to relate attribute information from the Input Coverage feature attribute table to the Output Coverage to ensure that the attributes are properly joined to the output feature attribute tables. Only the AAT will be updated when using the LINE option. If the Input Coverage has either PAT or AAT feature attribute tables, they are automatically updated in the Output Coverage for the POLY option. If the input coverage already has a PAT, the polygon's original internal number is used to join any additional items in the PAT to the output coverage PAT. It calculates the area and perimeter for each polygon and stores this information along with the polygon internal number and User-ID in the PAT. Builds a polygon attribute table (PAT) or an arc attribute table (AAT), depending on the option used.Deletes dangling arcs that are shorter than the specified dangle length.Creates the list of arcs that defines each polygon's boundary, numbers the nodes, and establishes the From-node and To-node for each arc as well as the internal polygon numbers to the left and right of each arc.Because the fuzzy tolerance actually moves arc vertices, understanding its relationship to coverage resolution is important. Merges coordinates within the fuzzy tolerance of each other.Finds intersections between arcs, splits the arcs, and codes the intersections as nodes (arc endpoints).Learn more about how Clean works Illustration Usage To do this, Clean edits and corrects geometric coordinate errors, assembles arcs into polygons, and creates feature attribute information for each polygon or arc (that is, creates a PAT or AAT). Generates a coverage with correct polygon or arc–node topology.
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