Tools

Boundary cleaning

1. 1

   Step 1: Schema

   Map source columns to admin code and name columns, then apply the crosswalk.

   

   Schema Map

   Infer a polygon layer's admin hierarchy crosswalk, review and edit it in place, and apply it to download the renamed layer, the crosswalk CSV, or both.

   Show 3 individual tools

   

   Schema Join

   Copy a join layer's admin hierarchy columns onto each input polygon by largest overlap, keeping conflicting values as numbered siblings.

   

   Schema Fill

   Cascade each admin-hierarchy column family down from its deepest non-empty level, and stamp every row with its real depth.

   

   Schema Detect

   Check a layer's admin-hierarchy columns for undetectable or skipped levels, inconsistent column naming, and units with several parents or none, without changing anything.

2. 2

   Step 2: Topology

   Find gaps and overlaps between units, then clean them.

   

   Topology Cleaner

   Detect overlaps and gaps in a polygon coverage and clean them automatically, with an adjustable gap-width threshold.

   Show 1 individual tool

   

   Detect

   Scan a polygon layer for gaps and overlaps and report them without fixing anything (read-only).

3. 3

   Step 3: Edge matching

   Fit units to a reference boundary so the outer edge follows the agreed outline.

   

   Edge Matcher

   Match fine polygons to their best-overlapping coarse boundary (admin 4 into 3, admin 4 into 0, or any other pair), then extend each group to fit its boundary exactly.

   Show 2 individual tools

   

   Edge Extender

   Fill gaps between adjacent polygons by extending boundaries outward with Voronoi diagrams.

   

   Mosaic

   Fit an already-extended input layer into a new overlay boundary. Assign, clip, and close seams in one pass, no re-extension.

   

   Clip

   Assign an input layer to its one best-overlapping overlay polygon by majority vote, then clip every input polygon to that boundary.

   

   Stitch

   Close seams in an already-tiled polygon layer with a single whole-table coverage-clean pass.

4. 4

   Step 4: Codes

   Keep the previous release's codes for units that carry over, or cold-start codes when there is no previous release.

   

   Code Update

   Reconcile an already-coded layer against an uncoded candidate: retain codes for unchanged units, assign fresh ones for the rest.

   Show 3 individual tools

   

   Code Create

   Give every unit a new hierarchical code, numbered within its parent, or build it from the layer's own source codes.

   

   Changelog

   Compare two versions of a polygon layer and classify each unit as unchanged, modified, merged, split, created, or removed.

   

   Code Detect

   Check a coded layer's unit codes for blanks, conflicting names, duplicates, split units, parent-prefix mismatches and format outliers, without changing anything.

5. 5

   Step 5: Names

   Fix spacing, invisible characters and encoding errors, then review what's left by hand: duplicates under the same parent, near-duplicate typos, blanks and placeholders.

   

   Name Clean

   Fix the name defects that can't change a name's meaning (spacing, invisible characters, Unicode normalization, encoding repairs) and report the rest for review.

   Show 1 individual tool

   

   Name Detect

   Check a coded layer's unit names for blanks, placeholders, duplicates under one parent, encoding errors and invisible characters, without changing anything.

6. ✓

   Validate

   Check the layer's schema, topology, codes and names in one pass before packaging it.

   

   Validate

   Run the schema, topology, code and name checks on one layer and summarize their findings by kind, without changing anything.

7. 6

   Step 6: Packaging

   Build per-level polygons, label points, and the boundary line network for release.

   

   Package

   Run Package Polygons, Package Points, and Package Lines against the same layer in one pass.

   Show 3 individual tools

   

   Package Polygons

   Dissolve a polygon layer up to every coarser admin level it contains, one output file per level.

   

   Package Points

   Produce one representative point per admin unit, at every level a polygon layer's hierarchy contains.

   

   Package Lines

   Extract every shared and exterior boundary edge in a polygon layer, classified by the coarsest level at which two neighbours diverge.