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fix(data): a Shapefile export says which vertices it leaves out (#1687) - #1704
A Shapefile export left out vertices with a missing (NaN) or infinite coordinate without saying so. The filter(finite) in shapefile_parts_in drops them from points, line parts and polygon rings, and a part or ring left with too few vertices goes with them, while the feature itself is written, so leftOut stayed 0. The issue's multipoint of four, one member's x NaN, came out with three and no notice.
What is written doesn't change. The export now says what it left out, one notice per kind with a count:
{target}: N vertices with a missing or infinite coordinate were left out of the Shapefile
{target}: N line parts were left out of the Shapefile, with fewer than 2 drawable vertices, or for a polygon layer N polygon rings were left out of the Shapefile, with fewer than 3 drawable vertices or in a polygon whose outer ring was left out. These count every part or ring the writer leaves out, whether it was written too short or left so by the vertices left out.
shapefile_geometry_notes (crates/data/src/io.rs) counts them with the writer's own filters, and only in features the writer keeps (shapefile_keeps), so a feature with nothing drawable left stays the existing left-out notice's and isn't counted twice. It runs beside shapefile_names_note and shapefile_values_notes in share.exportLayer, share.exportTable and the web app's ui.exportLayer. A projected export was never silent here: project refuses a non-finite coordinate before anything is written. The Shapefile row of the data formats guide now mentions the notice.
Testing
io::tests::a_shapefile_says_which_vertices_and_parts_it_leaves_out: the issue's multipoint (written with three members, leftOut 0, one vertex counted), a line losing two vertices and two parts (one left with a single finite vertex, one written with a single vertex), a multipolygon losing a hole and a whole polygon (5 vertices, 3 rings), a feature with nothing drawable left (counted only as left out), and clean geometry of each kind (no notice). The read-back assertions hold on main as well; only the notice is new.
tests::shapefile_exports_say_which_vertices_they_leave_out: through share.exportLayer to .shp and .zip, and share.exportTable; a clean layer gets no notice.
On Windows 11 x64, with this change based on 6cb3302: cargo fmt on the three crates, cargo clippy -p rustgis-data -p rustgis-engine -p rustgis-ui-egui --all-targets -- -D warnings, cargo test -p rustgis-data (880 passed, 0 failed, 11 ignored), the two new tests, download_service_tests::shapefile_download_says_which_field_names_it_changed (the web app's Shapefile download path), and cargo check --locked --target wasm32-unknown-unknown -p rustgis-web all pass.
After the review (db02e67): shapefile_geometry_notes takes the system the export writes. Projected, the writer gets project's copy, which has no missing or infinite coordinate (it refuses one, and Web Mercator writes an infinite latitude at 85.05°), so only parts too short to draw are counted. Reproduced first: a line layer written in Web Mercator holds 4 vertices read back, including the infinite latitude, yet the old rule said "1 vertex … and 2 line parts were left out". In the engine test, a layer with an infinite latitude exported in EPSG:3857 said "1 vertex … was left out". With the fix, only the one-vertex part is said, the EPSG:3857 export says nothing, and the EPSG:4326 one still gives the vertex notice. Then cargo fmt --all --check, cargo clippy -p rustgis-data -p rustgis-engine --all-targets -- -D warnings, cargo test -p rustgis-data (852 lib tests passed, 11 ignored, plus the integration tests), both engine Shapefile tests and cargo check -p rustgis-ui-egui pass. The wasm check wasn't re-run.
Not run: the whole of cargo xtask ci (the full engine and UI suites), and Linux or macOS.
…geos#1687)
A Shapefile export leaves out vertices with a missing or infinite
coordinate, and the line parts and polygon rings that leaves too short to
draw, while writing the feature, so nothing said so. The export now counts
both in a notice of each kind, with the writer's own filters and only in
the features it writes; what is written is unchanged.
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Shapefile exports now report counts of non-finite vertices and undrawable line parts or polygon rings for retained features. Table, layer, and UI export flows include these notices. The user guide describes the omissions and related export behavior.
Changes: Shapefile Geometry-Loss Notices
Layer / File(s)
Summary
Count geometry omissions crates/data/src/io.rs
A new function counts non-finite vertices and undrawable parts or rings for features retained by the Shapefile writer. Tests cover points, lines, polygons, omitted features, and clean geometry.
Add notices to export flows crates/engine/src/cmd/share.rs, crates/ui-egui/src/lib.rs, crates/engine/src/tests.rs, docs/user-guide/data-formats.md
Table and layer exports add geometry-loss notices for .shp and .zip outputs. The UI delivers notices after a successful download. Tests cover export notices, and the user guide describes the omissions.
Some Shapefile notices can be incomplete or incorrectly report omitted vertices. These are bounded notice defects suitable for follow-up.
Pre-merge checks: 5
Check name
Status
Explanation
Title check
The title clearly identifies the main change: Shapefile exports now report vertices they leave out.
Linked Issues check
Issue #1687 requires a count notice for non-finite vertices omitted from Shapefile exports, including when the feature is still written. The change summary reports that shapefile_geometry_notes coun…
Out of Scope Changes check
The export integrations, geometry-loss tests, and data-formats guide update support issue #1687. The supplied change summary identifies no unrelated changes.
Docstring Coverage
Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentat…
Description check
The description includes all required sections. It explains the change, why it is needed, how it was tested, states that there is no visible UI change, and links the related issue. It also identifies …
Full details: Linked Issues check
Explanation
Issue #1687 requires a count notice for non-finite vertices omitted from Shapefile exports, including when the feature is still written. The change summary reports that shapefile_geometry_notes counts omitted vertices and parts or rings using the writer’s filters, and that export integrations emit these notices. The reported tests cover the four-member multipoint case, line and polygon losses, fully omitted features, and clean geometry.
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Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 5 functions across 3 files. (1 skipped: 1 unsupported.)
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The description includes all required sections. It explains the change, why it is needed, how it was tested, states that there is no visible UI change, and links the related issue. It also identifies tests and platforms that were not covered.
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A rabbit checks each vertex with care, NaN and infinity are counted there. Lost rings and parts now leave a note, For every shape the writers wrote. The export paths report what went away, Then hop along their tidy way.
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Review comments at @docs/user-guide/data-formats.md:
- Line 583: Clarify in the Shapefile export description that vertex and part
counts apply only to features that are not omitted whole; an all-invalid
multipoint can count as an exported feature without contributing to the vertex
count. Keep the existing omission and count details intact.
- Line 583: Update the Shapefile export description’s ring-count wording to
clarify that it includes holes omitted because their outer ring is too short,
even when the holes themselves have enough vertices; keep the documented loss
behavior aligned with shapefile_geometry_losses.
- Line 583: Update the Shapefile export description to distinguish projected
exports: non-finite coordinates in projected data are rejected before the
Shapefile writer runs, so the export can fail rather than omit them and report a
count. Preserve the existing omission-and-count description for exports handled
by the writer, and use project_each and write_path_to to verify the distinction.
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Review comments at @docs/user-guide/data-formats.md:
- Line 583: Update the Shapefile export description to clarify that the reported
count includes all undrawable line parts and polygon rings, including those
already too short before vertices with missing or infinite coordinates are
omitted.
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Review comments at @docs/user-guide/data-formats.md:
- Line 583: Update the Shapefile export description to say that unprojected
exports omit vertices with missing or infinite coordinates, while projected
exports refuse only when projection produces a non-finite coordinate and
identify the affected feature. Preserve the existing short-part rules and
clarify that vertex and part/ring counts apply only to features the export
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- Line 2704: Complete the polygon-ring notice string in the tuple containing
“polygon ring” so its sentence ends with “left out”, and update the
corresponding expected text in the relevant test to match.
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Minor · Count losses from the geometry passed to the writer. · data-formats.md:622
docs/user-guide/data-formats.md:622 Minor · Functional Correctness · Quick win
Count losses from the geometry passed to the writer.
For a Web Mercator export, a multipoint containing a finite point and a point with infinite latitude writes both points: projection clamps the latitude. This call counts the original geometry and incorrectly reports one vertex left out. The web export has the same issue at crates/ui-egui/src/lib.rs, Line 3851. Calculate the notices from the projected geometry in both paths. (raw.githubusercontent.com)
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Review comment at @docs/user-guide/data-formats.md at line 622:
Update loss-notice counting in both the share export path and the web export
path to use the projected geometry passed to the writer, rather than the
original geometry. Preserve the existing projection behavior, including latitude
clamping, and count only vertices actually omitted from the geometry written.
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Review comments at @docs/user-guide/data-formats.md:
- Line 622: Update loss-notice counting in both the share export path and the
web export path to use the projected geometry passed to the writer, rather than
the original geometry. Preserve the existing projection behavior, including
latitude clamping, and count only vertices actually omitted from the geometry
written.
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Bug (low severity, medium confidence): the vertex notice is computed on the source coordinates, not on what a projected export writes.
write_layer passes ds (longitude/latitude) to shapefile_geometry_notes, but write_path_to writes project(ds, crs) when crs is projected. The same mismatch exists in ui.exportLayer (crates/ui-egui/src/lib.rs:3965), where crs can also be projected (default_export_crs returns the dataset's own projected CRS for .shp/.zip).
Failure case: a layer with an infinite latitude exported to Web Mercator. from_lonlat (crates/data/src/raster/crs.rs:639) clamps the latitude in lonlat_to_merc, so the projected vertex is finite and is written. The notice still counts it as a missing vertex and says it was "left out of the Shapefile", which is false. Part and ring counts can be off the same way, because they are computed from source finite-ness.
In a projected export a non-finite output coordinate is refused by project_each, so the writer never leaves out a vertex there. The vertex half of the notice is therefore always 0 for a projected export that succeeds.
Suggested fix: compute the notes from the dataset that is written. Either pass crs into shapefile_geometry_notes and skip the vertex count when crs != Crs::LonLat, or compute the notes on the projected copy. The projected case also has no test: the new tests only cover Crs::LonLat.
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Confirmed and fixed in db02e67. shapefile_geometry_notes now takes the system the export writes. In another system than longitude/latitude, the writer gets the projected copy, and project refuses a feature with a coordinate that doesn't project to a finite one. So every vertex a successful projected export writes is drawable, and the notes count only parts too short to draw. All three callers pass their system:
write_layer and the browser's ui.exportLayer pass crs;
share.exportTable passes Crs::LonLat, which it writes in.
shapefile_geometry_losses takes the same drawable predicate, and returns None for geometry the writer leaves out whole. That replaces the separate shapefile_keeps filter in the notes, so both decisions use one predicate.
Reproduced and confirmed on our side. The data test now writes a line layer in Web Mercator: one part with an infinite latitude, one part of a single vertex, one clean part. Read back, the file holds 4 vertices: the infinite latitude is written at 85.05°. With the longitude/latitude rule (the old behaviour), the notes said "1 vertex … and 2 line parts were left out". With the fix, they say only the one-vertex part. Written in longitude/latitude, the same layer keeps 2 vertices and is said as before, and a missing coordinate in a projected export is refused. The engine test exports a layer with an infinite latitude through share.exportLayer: in EPSG:3857 nothing is said, in EPSG:4326 the vertex notice is.
Projected exports get a vertex notice computed from source coordinates (low severity, medium confidence).write_layer (crates/engine/src/cmd/share.rs:645) and ui.exportLayer (crates/ui-egui/src/lib.rs:3965) compute shapefile_geometry_notes on the longitude/latitude dataset, but a projected export writes the projected copy. With an infinite latitude exported to Web Mercator, the latitude is clamped and the vertex is written, yet the notice says it was left out. A projected export that succeeds never leaves out a vertex, so the vertex count should be zero there. Posted inline with a fix. Already covered by the existing "projected refuses" thread, but this is a new defect.
Security
None found.
Performance
None worth raising. The extra pass over features is O(n) and matches the existing notes.
Quality (left for the release quality pass)
The "finite" predicate is written three ways: a closure on &&Coord in shapefile_keeps and shapefile_parts_in, and a slice fn in shapefile_geometry_losses.
The new tests cover only Crs::LonLat. Nothing exercises the projected-export path.
AGENTS.md
Compliant on the points checked: no unwrap or expect in new non-test code, notices carry counts, clean and lossy inputs are both tested, and the wasm path is not touched. The new engine test follows the neighbouring test's pattern.
Prior reviews
I left 4 concerns alone because the author addressed them and they are resolved: the count scope, the holes-with-outer-ring wording, the short-part wording, and the polygon sentence.
I verified the writer's filters against shapefile_geometry_losses and the expected counts in a_shapefile_says_which_vertices_and_parts_it_leaves_out by reading. I did not run the test suite; this session had no build or test runner.
Change size
Compared: the whole PR against main (merge base 32ea10d to PR head d1fa2a0).
The geometry notes were computed from the longitude/latitude layer, but
a projected export writes the projected copy, which project() leaves
without a missing or infinite coordinate (it refuses one, and Web
Mercator writes an infinite latitude at 85.05°). A layer with an
infinite latitude exported in EPSG:3857 was said to lose that vertex
and its part, though both were written. shapefile_geometry_notes now
takes the export's system and, projected, counts only parts too short
to draw.
Thanks for the review. The projected-export bug is fixed in db02e67 (replied inline), and both tests now cover a projected export as well as longitude/latitude.
On the "finite" predicate: the notes now use one predicate for both the keep decision and the losses (shapefile_geometry_losses with drawable). The writer's own closures in shapefile_parts_in, and shapefile_keeps (which the dBase value notes use), are left as they are for the release quality pass.
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Silent approximation in projected exports (AGENTS.md "Never silent"), medium-low confidence.
In a projected export, drawable is |_| true, so a vertex with an infinite latitude is not counted and nothing is said. But lonlat_to_merc (crates/geom/src/lib.rs:169) clamps latitude to ±85.05°, so the written vertex is at 85.05°, not the source value. The doc comment on this function and the Shapefile row in data-formats.md both state this as expected behaviour. The rule is that a writer which approximates data says what, how much and where.
The earlier thread on this line was about the miscount, which the fix resolved. This is a different point: the write itself changes the coordinate and reports nothing.
Failure case: a point at (10, +inf) exported to EPSG:3857 writes as (10, 85.05°) with no notice, while the same export in EPSG:4326 says "1 vertex with a missing or infinite coordinate was left out".
Possible fix: in the projected case, count source vertices whose coordinate is non-finite but projects finite, and add a notice such as "N vertices with an infinite latitude were written at the Web Mercator limit of 85.05°". Finite latitudes beyond 85.05° are clamped the same way, but that is pre-existing tile-map behaviour and out of scope here.
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That's what #1709 is for. A Web Mercator export says how many vertices it writes at 85.05°, an infinite latitude included. Its test a_web_mercator_export_says_what_it_writes_at_85_degrees exports polar.shp with points at 89°, −90°, 60° and +∞ to EPSG:3857 and gets polar.shp: 3 vertices of polar are beyond 85.05° north or south, and written at 85.05°, where Web Mercator ends. It counts only what the Shapefile writes, and covers the finite latitudes beyond 85.05° that this comment leaves out of scope.
I've kept it out of this PR so the two don't each add a notice for the same vertices. With both in, a Web Mercator Shapefile export says what it leaves out (this PR) and what it moves (#1709).
None confirmed. I checked the notice counts against the writer's filters in shapefile_parts_in (points, multipoints, line parts, polygon rings, holes whose outer ring is dropped). They agree. The hand-worked numbers in the new tests (5 vertices / 3 rings; 2 vertices / 2 parts; the Web Mercator case) also match.
Security
None found.
Performance
The notice pass is one extra linear walk over the features, with no allocation. It is negligible next to the write.
Quality (nits, grouped; per AGENTS.md these can wait for the release quality pass)
shapefile_geometry_losses duplicates the writer's filters rather than sharing them, so the two can drift. The doc comment says "the same filters as the writer's", which is true today.
shapefile_geometry_notes is pub, and its projected branch assumes project has already refused non-finite coordinates. Every current caller runs it only after a successful write, but the doc comment doesn't say so.
AGENTS.md
Never silent (medium-low confidence, inline comment posted at crates/data/src/io.rs:2736): in a projected export, an infinite latitude is clamped to ±85.05° by lonlat_to_merc and written with no notice. This is a different point from the earlier thread on that line, which was about the miscount and is resolved.
Earlier concerns: 6 review threads already exist on this PR (on share.rs:645, io.rs:2704 and four on data-formats.md:583). I left all 6 alone because the author or a reviewer resolved them or they are outdated, and the current code addresses them.
Change size
Compared: the whole PR against main (merge base 3da5b83 to PR head 5b684a2).
On the two quality points in the review summary (shapefile_geometry_losses repeating the writer's filters rather than sharing them, and shapefile_geometry_notes's doc comment not saying it runs after a successful write): left for the release quality pass.
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Summary
A Shapefile export left out vertices with a missing (NaN) or infinite coordinate without saying so. The
filter(finite)inshapefile_parts_indrops them from points, line parts and polygon rings, and a part or ring left with too few vertices goes with them, while the feature itself is written, soleftOutstayed 0. The issue's multipoint of four, one member's x NaN, came out with three and no notice.What is written doesn't change. The export now says what it left out, one notice per kind with a count:
{target}: N vertices with a missing or infinite coordinate were left out of the Shapefile{target}: N line parts were left out of the Shapefile, with fewer than 2 drawable vertices, or for a polygon layerN polygon rings were left out of the Shapefile, with fewer than 3 drawable vertices or in a polygon whose outer ring was left out. These count every part or ring the writer leaves out, whether it was written too short or left so by the vertices left out.shapefile_geometry_notes(crates/data/src/io.rs) counts them with the writer's own filters, and only in features the writer keeps (shapefile_keeps), so a feature with nothing drawable left stays the existing left-out notice's and isn't counted twice. It runs besideshapefile_names_noteandshapefile_values_notesinshare.exportLayer,share.exportTableand the web app'sui.exportLayer. A projected export was never silent here:projectrefuses a non-finite coordinate before anything is written. The Shapefile row of the data formats guide now mentions the notice.Testing
io::tests::a_shapefile_says_which_vertices_and_parts_it_leaves_out: the issue's multipoint (written with three members,leftOut0, one vertex counted), a line losing two vertices and two parts (one left with a single finite vertex, one written with a single vertex), a multipolygon losing a hole and a whole polygon (5 vertices, 3 rings), a feature with nothing drawable left (counted only as left out), and clean geometry of each kind (no notice). The read-back assertions hold onmainas well; only the notice is new.tests::shapefile_exports_say_which_vertices_they_leave_out: throughshare.exportLayerto.shpand.zip, andshare.exportTable; a clean layer gets no notice.cargo fmton the three crates,cargo clippy -p rustgis-data -p rustgis-engine -p rustgis-ui-egui --all-targets -- -D warnings,cargo test -p rustgis-data(880 passed, 0 failed, 11 ignored), the two new tests,download_service_tests::shapefile_download_says_which_field_names_it_changed(the web app's Shapefile download path), andcargo check --locked --target wasm32-unknown-unknown -p rustgis-weball pass.a_shapefile_counts_geometry_of_another_kind_left_out,shapefile_exports_say_which_field_names_they_changed) pass, andcargo fmt --all --checkis clean.shapefile_geometry_notestakes the system the export writes. Projected, the writer getsproject's copy, which has no missing or infinite coordinate (it refuses one, and Web Mercator writes an infinite latitude at 85.05°), so only parts too short to draw are counted. Reproduced first: a line layer written in Web Mercator holds 4 vertices read back, including the infinite latitude, yet the old rule said "1 vertex … and 2 line parts were left out". In the engine test, a layer with an infinite latitude exported in EPSG:3857 said "1 vertex … was left out". With the fix, only the one-vertex part is said, the EPSG:3857 export says nothing, and the EPSG:4326 one still gives the vertex notice. Thencargo fmt --all --check,cargo clippy -p rustgis-data -p rustgis-engine --all-targets -- -D warnings,cargo test -p rustgis-data(852 lib tests passed, 11 ignored, plus the integration tests), both engine Shapefile tests andcargo check -p rustgis-ui-eguipass. The wasm check wasn't re-run.cargo xtask ci(the full engine and UI suites), and Linux or macOS.UI evidence
No visible UI change.
Related issue
Closes #1687