feat: add autoware_lanelet2_map_divider package

[mitsudome-r]

Description

This is part of autowarefoundation/autoware_core#887

Add a new autoware_lanelet2_map_divider package that splits a single Lanelet2 (.osm) map into grid-aligned segments and emits a metadata file compatible with lanelet2_map_loader's selected-map-loading mode.

• New ROS 2 node autoware_lanelet2_map_divider_node with a launch file
• Loads the input map using the projector from map_projector_info.yaml (MGRS, LocalCartesianUTM, LocalCartesian, TransverseMercator, and Local supported), computes the axis-aligned bounding box of all points, and queries laneletLayer, areaLayer, lineStringLayer, and pointLayer per cell to build per-cell LaneletMaps.
• Writes one <prefix>_<gx>_<gy>.osm file per non-empty cell under <OUTPUT_DIR>/lanelet2_map.osm/ with the same projector used at load time, plus lanelet2_map_metadata.yaml (x_resolution, y_resolution, and file: [min_x, min_y] entries).
• Includes README and a gtest suite (test_lanelet2_map_divider).

How was this PR tested?

• Built the package with colcon build --packages-select autoware_lanelet2_map_divider.
• Ran the included gtest suite (test_lanelet2_map_divider) via colcon test.
• Verified end-to-end by running the divider on a sample lanelet2_map.osm, inspecting the generated lanelet2_map.osm/<gx>_<gy>.osm files and lanelet2_map_metadata.yaml, and confirming lanelet2_map_loader can consume the output in selected-map-loading mode.

Notes for reviewers

None.

Effects on system behavior

None.

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[Copilot]

Pull request overview

Adds a new autoware_lanelet2_map_divider ROS 2 package to split a single Lanelet2 .osm into grid-aligned per-cell map files and emit lanelet2_map_metadata.yaml compatible with lanelet2_map_loader’s selected-map-loading mode.

Changes:

• Introduces Lanelet2MapDivider library and Lanelet2MapDividerNode component/executable for dividing and exporting per-cell .osm tiles + metadata.
• Adds launch/config/schema + README documenting usage and output format.
• Adds a gtest suite that builds a synthetic map, runs the divider, and validates output tiles/metadata.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
map/autoware_lanelet2_map_divider/src/lanelet2_map_divider.cpp	Core map loading, grid partitioning, tile writing, and metadata generation
map/autoware_lanelet2_map_divider/src/lanelet2_map_divider.hpp	Public API for configuring/running the divider
map/autoware_lanelet2_map_divider/src/lanelet2_map_divider_node.cpp	ROS 2 node wrapper to run divider from parameters
map/autoware_lanelet2_map_divider/src/lanelet2_map_divider_node.hpp	Node declaration
map/autoware_lanelet2_map_divider/src/local_projector.hpp	Local projector helper for projector_type: Local
map/autoware_lanelet2_map_divider/test/test_lanelet2_map_divider.cpp	gtest coverage for tiling + metadata behaviors
map/autoware_lanelet2_map_divider/launch/lanelet2_map_divider.launch.xml	Launch entrypoint with args and parameter wiring
map/autoware_lanelet2_map_divider/config/lanelet2_map_divider.param.yaml	Default parameter file used by launch
map/autoware_lanelet2_map_divider/schema/lanelet2_map_divider.schema.json	Parameter schema for documentation/validation
map/autoware_lanelet2_map_divider/README.md	User-facing documentation and format description
map/autoware_lanelet2_map_divider/CMakeLists.txt	Build/test targets and component registration
map/autoware_lanelet2_map_divider/package.xml	Package dependencies and metadata

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[codecov]

Codecov Report

❌ Patch coverage is 59.85915% with 57 lines in your changes missing coverage. Please review.
✅ Project coverage is 7.26%. Comparing base (700c544) to head (35240f7).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
..._lanelet2_map_divider/src/lanelet2_map_divider.cpp	63.71%	8 Missing and 33 partials ⚠️
...let2_map_divider/src/lanelet2_map_divider_node.cpp	6.25%	2 Missing and 13 partials ⚠️
...oware_lanelet2_map_divider/src/local_projector.hpp	83.33%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##            main    #409      +/-   ##
========================================
+ Coverage   7.02%   7.26%   +0.23%     
========================================
  Files        497     501       +4     
  Lines      32735   32863     +128     
  Branches    3736    3819      +83     
========================================
+ Hits        2301    2386      +85     
- Misses     29079   29083       +4     
- Partials    1355    1394      +39     

Flag	Coverage Δ		*Carryforward flag
differential-humble	38.02% <38.02%> (?)
differential-jazzy	35.91% <35.91%> (?)
total	3.33% <ø> (+<0.01%)	⬆️	Carriedforward from 700c544
total-humble	4.93% <ø> (+<0.01%)	⬆️	Carriedforward from 700c544
total-jazzy	4.77% <ø> (+<0.01%)	⬆️	Carriedforward from 700c544

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