A Rust library and binaries to validate the syntax of CityJSON objects (CityJSON + CityJSONSeq).
It validates against the CityJSON schemas and additional functions have been implemented (because these checks cannot be expressed with JSON Schemas).
The following error checks are performed:
- JSON syntax: is it a valid JSON object?
- CityJSON schemas: validation against the schemas (CityJSON v1.0 + v1.1 + v2.0)
- Extension schemas: validate against the extra schemas if there's an Extension (those are automatically fetched from a URL)
- parents_children_consistency: if a City Object references another in its
"children"
, this ensures that the child exists. And that the child has the parent in its"parents"
- wrong_vertex_index: checks if all vertex indices exist in the list of vertices
- semantics_array: checks if the arrays for the semantics in the geometries have the same shape as that of the geometry and if the values are consistent
- textures: checks if the arrays for the textures are coherent (if the vertices exist + if the texture exists)
- materials: checks if the arrays for the materials are coherent with the geometry objects and if the material exists
It also verifies the following, these are not errors but warnings since the file is still considered valid and usable, but they can make the file larger and some parsers might not understand all the properties:
- extra_root_properties: if CityJSON has extra root properties, these should be documented in an Extension. If not this warning is returned
- duplicate_vertices: duplicated vertices in
"vertices"
are allowed, but they take up spaces and decreases the topological relationships explicitly in the file. If there are any, cjio has the operatorclean
to fix this automatically. - unused_vertices: vertices that are not referenced in the file, they take extra space. If there are any, cjio has the operator
clean
to fix this automatically.
cjval
is a library, and has 2 different binaries:
cjval
to validate a CityJSON file or a CityJSONSeq stream (it downloads automatically Extensions)cjvalext
to validate a CityJSON Extension file
- install the Rust compiler
cargo install cjval --features build-binary
- install the Rust compiler
git clone https://github.com/cityjson/cjval.git
cargo build --release --features build-binary
(this will ensure the binaries are compiled too)./target/release/cjval myfile.json
The code is uses at https://validator.cityjson.org, it is compiled as a WebAssembly (WASM code here) and a simple GUI was built.
The CityJSON schemas are packaged with the binary, so it suffices to:
cjval myfile.city.json --verbose
(the latest schemas of a X.Y version will be automatically fetched)
--verbose
is used to get a detailed report per error checks.
If the file contains one or more Extensions, eg:
{
"type": "CityJSON",
"version": "2.0",
"extensions":
{
"Potato":
{
"url": "https://www.cityjson.org/extensions/potato.ext.json",
"version": "1.0"
}
}
...
then cjval
will download automatically the Extension schema files.
If instead you want to use your own local Extension schema(s), you can pass them as argument with the argument -e
and this will overwrite the automatic download:
cjval myfile.city.json -e ./myextensions/generic.ext.json
To validate a stream of CityJSONFeature, you need to 'cat' the file:
cat mystream.city.jsonl | cjval --verbose
Or you can use cjseq to generate the stream from a CityJSON file:
cjseq cat -f myfile.city.json | cjval --verbose
and you'll get a short report per line (which is one CityJSON
followed by several CityJSONFeature
).
--verbose
is used to get a detailed report per line, if not used then only lines with errors are reported.
- @hugoledoux
- @josfeenstra (started the project for an MSc Geomatics course at TU Delft, original code)