Convert OVOBJ to SHP

Convert OVOBJ to SHP

Use the bundled deterministic parser for supported OviO zlib-compressed point labels and XML OVKML point exports. Do not parse either format ad hoc when the script supports the file.

中文说明

将奥维互动地图的点数据转换为 WGS84（EPSG:4326）Shapefile，并保留点名称、原始经纬度和转换后的经纬度。支持两种输入：

• .ovobj：在已验证的 OviO 点标签布局中，二进制坐标默认视为 WGS84，不要因为界面显示 GCJ-02 而再次偏移转换。
• .ovkml：读取每个点的 OvCoordType。CGCS2000 与 WGS84 直接写入；只有 GCJ-02 才转换为 WGS84。

优先使用点数完整的 .ovkml。转换报告中的 point_count、parse 和 validation.ok 是核查是否漏点、是否发生坐标偏移的依据。

Workflow

1. Locate .ovobj and .ovkml inputs and identify the most complete source file before conversion.
2. Leave --source-crs at auto unless the user has authoritative coordinate information. In the supported OVOBJ layout, numeric coordinates are stored as WGS84. For OVKML, OvCoordType controls automatic detection: CGCS2000 and WGS84 remain WGS84; GCJ-02 is converted to WGS84.
3. Find a Python environment containing geopandas, shapely, and a Shapefile writer. Prefer an environment explicitly requested by the user.
4. Run scripts/convert_ovobj_to_shp.py with an absolute input path.
5. Read the emitted JSON summary and verify the generated .shp, .shx, .dbf, .prj, and .cpg files.
6. Report the point count, source-coordinate assumption, output CRS, bounds, skipped records, and output path.

Commands

Convert one OVOBJ with automatic coordinate handling:

python scripts/convert_ovobj_to_shp.py "C:\data\samples.ovobj"

Convert every OVOBJ and OVKML directly inside a directory:

python scripts/convert_ovobj_to_shp.py "C:\data\ovital" --output-dir "C:\data\shp"

Add --recursive to include subdirectories. Add --overwrite only when replacing existing outputs is intended.

Coordinate Rules

• Write output geometry as WGS84 longitude/latitude with EPSG:4326.
• Preserve source values in src_lon and src_lat, and write converted values in wgs_lon and wgs_lat.
• Treat GCJ-02 as a coordinate encoding without an EPSG identifier. Do not assign EPSG:4326 directly to unconverted GCJ-02 geometry.
• OVOBJ's user-interface coordinate display may be GCJ-02 while its binary numeric fields are WGS84. Do not convert those fields merely because the source is in mainland China.
• If the source CRS is uncertain and a wrong choice would affect fieldwork, compare against a known point or an OVKML export before using --source-crs gcj02.

Supported Scope

The OVOBJ parser supports point-label files with the OviO header, zlib payload beginning at byte 24, point records marked by AB 00 00 00, little-endian latitude/longitude at record offsets 136/144, and length-prefixed UTF-8 names. The OVKML parser supports Placemark > Point > coordinates records and OvCoordType. Stop with a clear error for unsupported headers, compression layouts, coordinate types, tracks, polygons, attachments, encrypted files, ODB databases, or arbitrary future OVOBJ versions.

Output Contract

Each Shapefile contains id, name, source_crs, src_lon, src_lat, wgs_lon, wgs_lat, and point geometry. The script writes UTF-8 .cpg, WGS84 .prj, and a sibling *_conversion_report.json. Treat conversion as successful only when the report shows validation.ok: true, including input/output point-count equality and zero geometry-versus-attribute discrepancy.