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fix(data): an export in Web Mercator says what it writes at 85.05° - #1709
An export in Web Mercator (share.exportLayer with "crs": "EPSG:3857", or a layer read in it) wrote every latitude beyond 85.05° north or south at 85.05°, and said nothing: lonlat_to_merc clamps latitude to the edge of Web Mercator's square. The World Atlas sample's Countries, exported to a Shapefile in EPSG:3857, comes back with Antarctica stopping at 85.05° south. An infinite latitude is clamped the same way. (A missing coordinate, or an infinite longitude, can't be projected, so the export refuses it.)
What is written doesn't change. export_notes, which share.exportLayer and the web app's ui.exportLayer already run with the export's system, now says it, one notice for the export:
{target}: N vertices of {layer} are beyond 85.05° north or south, and written at 85.05°, where Web Mercator ends
The vertices are counted from the features the file holds. A Shapefile target (.shp, or .zip as the exports name a zipped one) holds only geometry of the layer's kind, and of it only parts it can draw, so the count walks what shapefile_parts_in writes (io::shapefile_vertices). Each export passes the extent of the features it writes (ds.extent()), not Layer::extent(), which for a raster layer is the raster's and for a streamed layer the extent its source declares. A streamed layer written a chunk at a time holds no features, so the chunk writer counts the vertices beyond 85.05° as it writes them (Exported::beyond_web_mercator), and write_layer says that count in the same words (web_mercator_moved_note); neither a missing nor an overwide declared extent matters. Only a windowed layer (features that are a window onto the source) has its extent tell, without a count: the extent of {layer} reaches beyond 85.05° north or south, and what lies beyond is written at 85.05°, where Web Mercator ends. Several layers make one notice, as the other export notices do. The other callers of export_notes write longitude/latitude and get nothing new. The data formats guide says so.
For comparison, PROJ 9.8.1 (so GDAL and QGIS) doesn't clamp: 89°N is y = 30 240 972 m and reads back as 89°, and ±90° gives ±242 528 681 m. RustGIS keeps its clamp, which matches its map and the tile pyramid; this change only reports it. Writing PROJ's values instead would be a separate choice.
Testing
Reproduced first: with the notice turned off, both new tests fail on it. The data test's projection checks pass (89°N, 90°S and the infinite latitude are written at ±85.05°) and the export says nothing; the World Atlas's Countries, exported in EPSG:3857, moves 8 vertices of Antarctica to 85.05° south and says nothing.
io::tests::a_web_mercator_export_says_what_it_writes_at_85_degrees: a layer with points at 89°N, 90°S, 60°N and an infinite latitude is projected with the three beyond at ±85.05° (read back through merc_to_lonlat), and the notice counts those 3; in longitude/latitude or UTM, or within 85.05°, nothing is said; one vertex reads singular; several layers make one notice counting all of theirs; a windowed layer is told by the extent passed, and isn't when that extent stays within 85.05°.
tests::web_mercator_exports_say_what_they_write_at_85_degrees: the World Atlas's Countries exported with "crs": "EPSG:3857" gives exactly one notice, with the count of its vertices beyond 85.05°, and the Shapefile read back stops at 85.05° south; exported with "crs": "EPSG:4326", nothing is said and the file's southern edge is the layer's own, past 85.05°.
With the notice back on, both pass: the Countries export gives exactly the notice counting its 8 vertices, and the file stops at 85.05° south.
On Windows 11 x64, based on 8f7ee4c: cargo fmt --all --check, cargo clippy -p rustgis-data -p rustgis-engine --all-targets -- -D warnings, cargo test -p rustgis-data (902 passed, 0 failed, 11 ignored), the two new tests with shapefile_exports_say_which_field_names_they_changed, the engine's define_projection, geojson_crs, planetary_export and polar_edits tests (62 passed), and cargo check --locked --target wasm32-unknown-unknown -p rustgis-web all pass.
After the review (b8f2a03), each finding reproduced first, then confirmed fixed:
Raster layer: the engine test exports a world GeoTIFF (EPSG:4326, ±90°) as a GeoPackage in EPSG:3857. With the old l.extent() in write_layer, the export succeeds and says "the extent of globe reaches beyond 85.05° …" though it writes no vertices; with the fix, nothing is said.
Shapefile count: the data test's line layer (a 2-vertex line, a one-vertex part, a point) and polygon layer (a 3-vertex hole, a 2-vertex hole, a polygon whose outer ring has 2 vertices) give 2 and 4 vertices for .shp and .zip, and 4 and 12 for .gpkg. Each Shapefile is written and read back, and holds that many vertices at 85.05°. With the Shapefile filter off, the test fails with 4 for lines.shp.
Streamed: the countries, written to a GeoPackage and streamed from it, are exported in chunks to a GeoPackage (the extent notice) and whole to a Shapefile (the count, the same as the layer's).
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), the engine's export, stream and out-of-place tests (82 passed) and cargo check -p rustgis-ui-egui pass. The wasm check wasn't re-run.
After CodeRabbit's second review (dbc4d7b): a test source that declares no extent, with its polar points after the first chunk, written a chunk at a time to a GeoPackage and to a FlatGeobuf in EPSG:3857, counts 3 vertices, and the files read back hold 3 at 85.05°; in EPSG:4326, none. Reproduced first: with the counting off, that test fails with 0 for 3. The engine test expects the count from the streamed GeoPackage exported in chunks, and requires the raster export to succeed. Then cargo fmt --all --check, cargo clippy -p rustgis-data -p rustgis-engine --all-targets -- -D warnings, cargo test -p rustgis-data (853 lib tests passed, 11 ignored, plus the integration tests) and the engine's Web Mercator, export and stream tests (80 passed) pass.
Not run: the whole of cargo xtask ci, and Linux or macOS.
UI evidence
No visible UI change.
Related issue
None. Found while answering a review comment on #1704: Web Mercator's clamp is why a projected export doesn't refuse an infinite latitude. #1033 fixed the same clamp in the geometry tools.
Summary by CodeRabbit
New Features
Web Mercator exports clamp latitudes beyond ±85.05° and report how many vertices were moved when a count is available. Counts reflect vertices included in the export, including streamed exports as they are written.
For windowed data, notices can identify affected layers without a vertex count. No Web Mercator notice appears when no layer is affected or when exporting to another coordinate system.
Documentation
Export guidance now covers the Web Mercator latitude limit and when coordinates are reported as out of place.
Web Mercator ends at 85.05° north and south, and an export in it wrote
every latitude beyond (an infinite one too) at 85.05° without saying so:
the World Atlas's Countries lost Antarctica's southern edge. The export
notices now count the vertices moved, from the layer's features, or name
the layer from its source's extent when its features are only a window.
What is written is unchanged.
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Walkthrough
Web Mercator exports now report layers with latitudes beyond ±85.05°. Notices include qualifying vertex counts or identify affected layers from their extents when counts are unavailable. Streamed exports count moved vertices, and export callers use the relevant extent when generating notes.
Changes: Web Mercator export notices
Layer / File(s)
Summary
Detect affected layers and format notices crates/data/src/io.rs, crates/data/src/lib.rs
Export notes count qualifying vertices or use extents for windowed datasets. Shapefile counts include only vertices its writer emits.
Count moved vertices and connect export callers crates/data/src/export.rs, crates/engine/src/cmd/share.rs, crates/ui-egui/src/lib.rs
Streamed exports count vertices beyond the Web Mercator limit before projection. Export callers use dataset extents or streamed movement counts when generating notes.
Verify and describe export notices crates/data/src/io.rs, crates/data/src/export/tests.rs, crates/engine/src/tests.rs, docs/user-guide/data-formats.md
Tests cover projection limits, vertex counts, extent notices, streamed output, and other coordinate systems. The user guide describes the limits and notices.
opengeos/RustGIS#1281: Added export_notes, which this change extends with Web Mercator latitude notices.
opengeos/RustGIS#1704: Both changes use the Shapefile writer’s geometry filters when determining which vertices to count.
Suggested labels:ci:macos
Suggested reviewers:giswqs
Merge Risk: Low · previous review a018e
A mixed-layer export notice can omit the number of affected vertices, although it still warns about the latitude limit. This is a bounded issue for follow-up.
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The title clearly identifies the main change: Web Mercator exports now report latitude clamping at 85.05°.
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A rabbit checks the latitude line, Where Web Mercator marks its sign. The moved points join the export count, Their notes now tell the full amount. Across the map, the bounds are clear, A tidy notice hops from here.
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crates/data/src/export.rs
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crates/engine/src/tests.rs
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Actionable comments posted: 1
Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @crates/engine/src/tests.rs:
- Line 33316: Strengthen the EPSG:4326 extent assertion by capturing the source
layer’s min_y before export and comparing it with south(&s, back) using a
serialization tolerance, so an export truncated to the latitude limit cannot
pass.
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⚠️ Outside diff range comments (1)
Minor · Track affected coordinates in streamed exports. · lib.rs:494-500
crates/data/src/lib.rs:494-500 Minor · Functional Correctness · Quick win
Track affected coordinates in streamed exports.
A polar-projected source can have vertices beyond 85.05° even when its boundary-sampled extent is within that limit. The writer clamps those vertices, but the empty export dataset and extent fallback produce no notice.
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Review comment at @crates/data/src/lib.rs around lines 494 - 500:
Update the affected-coordinate accounting around ds.windowed and moved so
streamed exports record vertices clamped beyond MAX_LAT, even when ds.features
is empty and the sampled extent e is within range. Track affected coordinates in
the streamed export path and preserve the existing notice behavior based on
moved rather than relying on the extent fallback.
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Outside diff comments:
Review comments at @crates/data/src/lib.rs:
- Around line 494-500: Update the affected-coordinate accounting around
ds.windowed and moved so streamed exports record vertices clamped beyond
MAX_LAT, even when ds.features is empty and the sampled extent e is within
range. Track affected coordinates in the streamed export path and preserve the
existing notice behavior based on moved rather than relying on the extent
fallback.
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I read the diff, the staged AGENTS.md, and the code it touches: export_notes and the writers in crates/data, the engine export path, and the geometry helpers. I did not build or run the tests, since I had no shell. Two inline comments are posted (lib.rs:499 and lib.rs:496). The earlier review thread on the EPSG:4326 southern-edge test is answered by 5e0c797, so I did not raise it again. I left 0 earlier concerns alone for that reason.
Bugs
Raster layers can get a false "parts beyond 85.05°" note. The extent fallback is meant only for streamed layers, but write_layer passes l.extent() for all layers, and a raster's dataset is empty. Exporting a world raster to GPKG, SHP or FGB in EPSG:3857 would produce a note about vertices that are never written. Confidence: medium. Posted inline at lib.rs:499.
A streamed GeoPackage uses its declared gpkg_contents extent for the same fallback. Many files declare world bounds, so the note can claim parts beyond 85.05° when the data stops short. Confidence: medium-low. Covered in the lib.rs:499 comment.
The vertex count includes features that the Shapefile or FlatGeobuf writer leaves out, so a mixed-geometry export can overstate N. Confidence: low. Posted inline at lib.rs:496.
Security
None found.
Performance
The new per-feature scan has no Cancel point, and its doc comment does not say so. It runs on the export's background thread, so the cost is small. Confidence: low.
Quality
In the Web Mercator mixed case (one layer counted, one windowed), the count is dropped and the message says "the parts of 2 layers", although one layer's count is known.
For out-of-place metre coordinates, the 85.05° note duplicates the existing out-of-place note.
In docs/user-guide/data-formats.md (lines 198–200), the new paragraph is awkwardly worded, its line wrapping is inconsistent with the rest of the section, and it does not mention that an infinite latitude is clamped too.
AGENTS.md
The Never-silent and test-both-ways rules are followed: notices are emitted, and the tests cover lossy and clean input. Cancel points: the scan is inside the background export, and the doc comment does not mention it (see Performance). Notice text is hard-coded English, matching the surrounding export_notes messages.
Change size
Compared with main (merge base 46c86be to PR head 5e0c797).
An export passed every layer's extent to the Web Mercator notice, so a
raster layer, which writes no vertices, was said to have parts beyond
85.05°, and a streamed layer read whole was judged by the extent its
source declares. The extent of the features written is passed now, and
the source's only for a layer written a chunk at a time, where the
notice says only that the extent reaches beyond.
A Shapefile holds only geometry of the layer's kind, and of it only
parts it can draw: the count now leaves out what it doesn't write
(io::shapefile_vertices), as the file read back shows.
Thanks for the review. The two bugs are fixed in b8f2a03 (replied inline), and the docs paragraph is reworded and wrapped like the rest of the section. It also says now that an infinite latitude is written at 85.05°, and that a chunked export goes by its source's extent. The doc comment of web_mercator_note says its count is one pass without a Cancel point, as the other notices' passes are.
Left for the release quality pass:
In a mixed case (one layer counted, one windowed), the counted layer's number is dropped. Only exports with several layers can hit this, and those are all longitude/latitude today.
For coordinates out of place, the 85.05° notice duplicates the out-of-place one.
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⚠️ Outside diff range comments (1)
Major · Detect clamping when the source extent is unavailable. · data-formats.md:616
docs/user-guide/data-formats.md:616 Major · Data Integrity & Integration · Heavy lift
Detect clamping when the source extent is unavailable.
At crates/engine/src/cmd/share.rs:639, a streamed GeoPackage without a declared extent or R-tree uses the loaded window for l.extent(). If that window excludes polar features, a chunked EPSG:3857 export can clamp them without a notice.
When the source extent is unavailable, accumulate the affected extent or count while writing chunks instead of relying on the window.
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Review comment at @docs/user-guide/data-formats.md at line 616:
Update the chunked EPSG:3857 export path for streamed GeoPackages so that, when
the source extent is unavailable, it accumulates the affected extent or feature
count while writing chunks and uses that information to detect and report
clamping. Do not rely on the loaded window from l.extent() for this case.
Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @crates/engine/src/tests.rs:
- Line 33332: Require the `share.exportLayer` call in the test to succeed by
unwrapping its result instead of discarding it, so the notice assertion only
runs after a successful export.
---
Outside diff comments:
Review comments at @docs/user-guide/data-formats.md:
- Line 616: Update the chunked EPSG:3857 export path for streamed GeoPackages so
that, when the source extent is unavailable, it accumulates the affected extent
or feature count while writing chunks and uses that information to detect and
report clamping. Do not rely on the loaded window from l.extent() for this case.
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A streamed layer written a chunk at a time comes with no features, so
its 85.05° notice went by the extent: the one its source declares, or
the loaded window when it declares none, which can leave out polar
features and say nothing of them. The chunk writer now counts the
vertices beyond 85.05° as it writes them (Exported::beyond_web_mercator),
and the export says the count. The extent stands in only for a windowed
layer now.
On the outside-diff comment (data-formats.md:616, a chunked export of a streamed GeoPackage without a declared extent): agreed, and fixed in dbc4d7b by counting as the chunks are written, as you suggested.
export::write_chunks_to counts, in Web Mercator, the vertices with a finite longitude and a latitude beyond 85.05° in each chunk, before projecting, and returns the count as Exported::beyond_web_mercator. It resets the count when a GeoPackage export feeds the features again. Every vertex counted is written: the formats written in Web Mercator a chunk at a time are GeoPackage, which writes every feature, and FlatGeobuf, which leaves out only features without geometry.
write_layer says it with web_mercator_moved_note, in the same words as a layer counted whole: "N vertices of X are beyond 85.05° north or south, and written at 85.05°, where Web Mercator ends".
The extent no longer stands in for a chunked export, so neither a missing extent nor a declared one that's too wide matters. web_mercator_note uses the extent only for a windowed layer, whose features are a window onto its source; no export passes one in Web Mercator today.
Reproduced and confirmed on our side. export::tests::a_streamed_web_mercator_export_counts_what_it_writes_at_85_degrees writes a test source that declares no extent, two features a chunk, with its polar points after the first chunk. It writes to a GeoPackage and to a FlatGeobuf in EPSG:3857: 3 vertices are counted, and the file read back holds 3 at 85.05°; in EPSG:4326, none. With the counting turned off, it fails with 0 for 3. The engine test now expects the count from a streamed GeoPackage exported in chunks, the same as the Shapefile read whole. The docs say a chunked export is counted as it's written.
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Minor · Keep known counts in mixed-layer notices · lib.rs:532-549
crates/data/src/lib.rs:532-549 Minor · Functional Correctness · Quick win
Keep known counts in mixed-layer notices
When export_notes receives both a counted layer and a qualifying windowed layer, the windowed layer makes totalNone. The notice then omits the known count. Report the counted layers separately from the extent-only layers in the notice.
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Review comment at @crates/data/src/lib.rs around lines 532 - 549:
Update web_mercator_said to separate layers with known vertex counts from
extent-only layers instead of letting an unknown count erase the known total.
Include the counted layers and their summed vertex count alongside the
extent-only layers in the notice, preserving the existing single-category
wording when only one category is present.
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Outside diff comments:
Review comments at @crates/data/src/lib.rs:
- Around line 532-549: Update web_mercator_said to separate layers with known
vertex counts from extent-only layers instead of letting an unknown count erase
the known total. Include the counted layers and their summed vertex count
alongside the extent-only layers in the notice, preserving the existing
single-category wording when only one category is present.
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crates/data/src/export.rs
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I merged main in, because #1724 had made this branch conflict. Both changes added a count to the chunked export at the same lines: #1724's null_numbers, and this PR's beyond_web_mercator. The merge keeps both, in Exported, write_chunks_to, share.rs's write_layer and the streamed-export test.
No correctness bugs found on the changed paths. The Shapefile vertex count in io::shapefile_vertices matches the writer's rules (shapefile_parts_in) for lines, polygons and holes. The non-Shapefile count walks every vertex GeoPackage and FlatGeobuf write. Non-projected formats refuse Web Mercator, so the notice can't claim a projection that wasn't written. The desktop path loads the whole streamed source, so ds.extent() is correct there. (High confidence)
Low confidence, unreachable from current callers: in web_mercator_said, the (_, None) arm drops the counted vertices when one layer has a count and another is extent-only. Posted inline at crates/data/src/lib.rs:556.
Security
None found. The change adds no parsing or command surface, and the new code has no indexing or unwraps outside tests.
Performance
The extra coordinate pass only runs for Web Mercator exports, and the doc comment says it has no Cancel point. That matches AGENTS.md's stated exemption for short passes, so no finding. (High confidence)
Quality
The comment at crates/engine/src/cmd/share.rs:646-648 says a chunk-written streamed layer's source extent "tells" the 85.05° notice. The chunk layer isn't windowed, so the extent only feeds the out-of-place check. The count does the work. Posted inline with a suggested rewording. (Medium confidence)
Not posted: for raster layers, ds.extent() is empty, so the out-of-place note that l.extent() used to give is gone. Raster layers reach write_layer with an empty dataset, and I found no raster refusal in layer_work, so the file holds no raster data either way. Raster export through share.exportLayer looks silently empty, which predates this PR. (Low confidence, outside the changed lines)
AGENTS.md
Notices use the existing export_notes and left_out paths, one notice per export, and tests cover both the lossy and clean cases. The data crate's format! notices match the existing style. The new tests need base64, world() and notice_mark helpers that exist in the engine tests. I could not build or run anything here, so compile and test results are unverified.
Prior reviews: 4 earlier threads. The raster-extent and Shapefile-count concerns are fixed in the current code, and the two test-only threads were resolved. I left all 4 alone and did not re-raise any.
Change size
Compared with main (merge base 41315de to PR head a018eea).
A layer counted and a windowed layer told by its extent made the
notice fall back to extents for both, dropping the count. Each kind
now gets its own clause in the one notice. Also corrects the comment
on the extent write_layer passes for a chunk-written layer.
Bugs: None found in the changed code. I checked the parts most likely to be wrong:
The Shapefile vertex count (io::shapefile_vertices) matches the writer's line and polygon filters in shapefile_parts_in.
Chunked Web Mercator writes are limited to GeoPackage and FlatGeobuf, and the chunk counter runs in the feed path that all chunked writers share, so no writer skips the count.
Streamed layers reach the export as non-windowed datasets, so the count is never skipped for them.
I checked the expected counts in the new tests by hand against their fixtures: 2 and 4 for a Shapefile, 4 and 12 for a GeoPackage, and 3 for the chunked polar case. I did not run the test suite.
Security: None found. The diff adds no new parsing of untrusted input.
Performance: Nothing worth raising. A Web Mercator export adds one pass over each layer's coordinates. The chunked path counts during the write it already does. The doc comment on web_mercator_note says the pass has no Cancel point, which AGENTS.md allows when stated.
Quality
(confidence: about 60%) The windowed extent-only path (the past branch in web_mercator_note, the extents arm of web_mercator_said, and the windowed case in its test) cannot be reached from any production export. Both export callers pass non-windowed datasets: streamed layers are read whole through materialize, or chunked through chunk_export, and both are built with Dataset::new, which sets windowed: false. The sharing callers all pass LonLat. The doc comments say "only a windowed layer has its extent tell", which describes a path no user can trigger. Consider removing it, or saying in the doc comment that no current caller reaches it. This can wait for the release quality pass.
AGENTS.md: No violations found.
No unwrap, expect, panic or indexing in non-test code.
Both notice paths go through the existing export notes, one notice per kind with a count.
Both directions are tested.
data-formats.md is updated.
Nothing below L6 touches egui.
The diff does not change where the export runs, so its background behaviour is unchanged.
Outside this PR (not counted as findings): A raster layer exported with share.exportLayer writes l.dataset, which holds no features for a raster layer. The file therefore has no raster data, and nothing says so. The new raster case only asserts that the 85.05° notice is absent. This predates the PR. (confidence: about 70%)
Earlier concerns: There are 6 review threads on this PR, all resolved and outdated. I checked the current code for each fix: the EPSG:4326 south-edge assertion, the raster extent change, the Shapefile vertex count, the unwrap on the raster export, the split multi-layer notice, and the share.rs comment. They all hold. I left all 6 alone because they were already raised and answered.
Change size
Compared: the whole PR against main (merge base 33debef to PR head 3a424cf).
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Thanks @bearinmindcat, this closes a real silent loss in Web Mercator exports, and the tests check the counts against the files read back.
What I changed on your branch:
Merged main (454ed2c). Two conflicts, both from #1704 landing next to your additions: in crates/data/src/io.rs I kept your shapefile_vertices alongside the new shapefile_geometry_losses / shapefile_geometry_notes, and in crates/engine/src/tests.rs I kept both new tests. I also updated a comment in #1704's test that said an infinite latitude in Web Mercator is "said nothing of", since your notice now says it.
3a424cf: when one layer had a count and a windowed layer was told by its extent, web_mercator_said fell back to "the extents of ..." for both and dropped the count. Each kind now gets its own clause in the one notice, with a test. Also reworded the comment on the extent write_layer passes for a chunk-written layer (it only feeds the out-of-place check).
Ran the data and engine export, Shapefile and Web Mercator tests, fmt and clippy locally; CI is green.
Yo thanks @giswqs I use arcgis a lot for my uni classes so I thought it would be a good idea to start working on issues & PRs! Thanks for your project mate hopefully I can convince my professor to start using this!
In the mean time I'll continue to do my best to help contribute :)
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Summary
An export in Web Mercator (
share.exportLayerwith"crs": "EPSG:3857", or a layer read in it) wrote every latitude beyond 85.05° north or south at 85.05°, and said nothing:lonlat_to_mercclamps latitude to the edge of Web Mercator's square. The World Atlas sample's Countries, exported to a Shapefile in EPSG:3857, comes back with Antarctica stopping at 85.05° south. An infinite latitude is clamped the same way. (A missing coordinate, or an infinite longitude, can't be projected, so the export refuses it.)What is written doesn't change.
export_notes, whichshare.exportLayerand the web app'sui.exportLayeralready run with the export's system, now says it, one notice for the export:{target}: N vertices of {layer} are beyond 85.05° north or south, and written at 85.05°, where Web Mercator endsThe vertices are counted from the features the file holds. A Shapefile target (
.shp, or.zipas the exports name a zipped one) holds only geometry of the layer's kind, and of it only parts it can draw, so the count walks whatshapefile_parts_inwrites (io::shapefile_vertices). Each export passes the extent of the features it writes (ds.extent()), notLayer::extent(), which for a raster layer is the raster's and for a streamed layer the extent its source declares. A streamed layer written a chunk at a time holds no features, so the chunk writer counts the vertices beyond 85.05° as it writes them (Exported::beyond_web_mercator), andwrite_layersays that count in the same words (web_mercator_moved_note); neither a missing nor an overwide declared extent matters. Only awindowedlayer (features that are a window onto the source) has its extent tell, without a count:the extent of {layer} reaches beyond 85.05° north or south, and what lies beyond is written at 85.05°, where Web Mercator ends. Several layers make one notice, as the other export notices do. The other callers ofexport_noteswrite longitude/latitude and get nothing new. The data formats guide says so.For comparison, PROJ 9.8.1 (so GDAL and QGIS) doesn't clamp: 89°N is y = 30 240 972 m and reads back as 89°, and ±90° gives ±242 528 681 m. RustGIS keeps its clamp, which matches its map and the tile pyramid; this change only reports it. Writing PROJ's values instead would be a separate choice.
Testing
io::tests::a_web_mercator_export_says_what_it_writes_at_85_degrees: a layer with points at 89°N, 90°S, 60°N and an infinite latitude is projected with the three beyond at ±85.05° (read back throughmerc_to_lonlat), and the notice counts those 3; in longitude/latitude or UTM, or within 85.05°, nothing is said; one vertex reads singular; several layers make one notice counting all of theirs; a windowed layer is told by the extent passed, and isn't when that extent stays within 85.05°.tests::web_mercator_exports_say_what_they_write_at_85_degrees: the World Atlas's Countries exported with"crs": "EPSG:3857"gives exactly one notice, with the count of its vertices beyond 85.05°, and the Shapefile read back stops at 85.05° south; exported with"crs": "EPSG:4326", nothing is said and the file's southern edge is the layer's own, past 85.05°.cargo fmt --all --check,cargo clippy -p rustgis-data -p rustgis-engine --all-targets -- -D warnings,cargo test -p rustgis-data(902 passed, 0 failed, 11 ignored), the two new tests withshapefile_exports_say_which_field_names_they_changed, the engine'sdefine_projection,geojson_crs,planetary_exportandpolar_editstests (62 passed), andcargo check --locked --target wasm32-unknown-unknown -p rustgis-weball pass.crates/engine/src/tests.rselsewhere) without conflicts, then ran the two new tests andcargo fmt --all --checkagain: they pass.l.extent()inwrite_layer, the export succeeds and says "the extent of globe reaches beyond 85.05° …" though it writes no vertices; with the fix, nothing is said..shpand.zip, and 4 and 12 for.gpkg. Each Shapefile is written and read back, and holds that many vertices at 85.05°. With the Shapefile filter off, the test fails with 4 forlines.shp.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), the engine's export, stream and out-of-place tests (82 passed) andcargo check -p rustgis-ui-eguipass. The wasm check wasn't re-run.cargo fmt --all --check,cargo clippy -p rustgis-data -p rustgis-engine --all-targets -- -D warnings,cargo test -p rustgis-data(853 lib tests passed, 11 ignored, plus the integration tests) and the engine's Web Mercator, export and stream tests (80 passed) pass.cargo xtask ci, and Linux or macOS.UI evidence
No visible UI change.
Related issue
None. Found while answering a review comment on #1704: Web Mercator's clamp is why a projected export doesn't refuse an infinite latitude. #1033 fixed the same clamp in the geometry tools.
Summary by CodeRabbit