Add support for vector (gdal) geometries

[geohardtke]

Hi there, Would be nice to have the ability to create Series of Geometry types, and then build functionality similar to geopandas (which I miss in rust) like opening a geopackage or shape file as a DataFrame.

For example:

use gdal::{vector};
use polars::series::Series;
use polars::prelude::NamedFrom;

fn main() {
    let mut geoms: Vec<vector::Geometry> = Vec::new();
    let mut geoms = vector::Geometry::empty(vector::OGRwkbGeometryType::wkbPoint).unwrap();
    geoms.add_point((0., 0., 0.));
    geoms.add_point((0., 1.,1.));
    let s = Series::new("geometry", geoms);
}

which of course returns:

  --> src/main.rs:10:17
   |
10 |         let s = Series::new("geometry", geoms);
   |                 ^^^^^^^^^^^ the trait `NamedFrom<Geometry, _>` is not implemented for `Series`
   |

If there is some interest in having this functionality added, I'm willing to (with a bit of help) try to implement it.

Cheers

[program--]

To add to this, it should be easier to add support for this once the GeoArrow format specification is stable (and similarly, OGC's GeoParquet specification. Both will inherently add GDAL support). This would be great to have!

[nmandery]

There also has been some related previous discussion in #1830

[kylebarron]

Should we close this to keep discussion in #1830?

[zundertj]

Closing; the discussion can continue in #1830.

[phayes]

@geohardtke , I've implemented a GDAL <-> Polars connector cate: https://github.com/phayes/polars_gdal

[geohardtke]

brilliant work! I'll check it out @phayes