# Mappers Warp
[](https://github.com/ScaleWeather/mappers_warp)
[](https://crates.io/crates/mappers_warp)
[](https://choosealicense.com/licenses/apache-2.0/)
[](https://deps.rs/repo/github/ScaleWeather/mappers_warp)
[](https://docs.rs/mappers_warp)
Very simplistic tool for reprojecting maps, based on the `GdalWarp`, using mappers for geographic projection.
This tool is effectively a reimplementation of `GdalWarp` code - all credit for the algorithm creation goes to the GDAL developers.
As you can see, this tool is not very comprehensively documented - if you would like to add something useful
to the documentation feel free to open a PR on Github.
## Features
- `multithreading` - enables parallel functions for `Warper`. Requires `rayon`, but can provide significant
performance improvements for some rasters.
- `io` - enables support for saving and loading `Warper` from file. Requires `rkyv`, but can be useful
when you want to initialize `Warper` ahead-of-time.
## Example
See more usage examples in integration tests.
```rust
use mappers::{
Ellipsoid, projections::{LambertConformalConic, LongitudeLatitude},
};
use mappers_warp::{CubicBSpline, Warper, RasterBoundsDefinition};
use ndarray::Array2;
let src_proj = LongitudeLatitude;
let tgt_proj = LambertConformalConic::builder()
.ref_lonlat(80., 24.)
.standard_parallels(12.472955, 35.1728044444444)
.ellipsoid(Ellipsoid::WGS84)
.initialize_projection()?;
let source_bounds =
RasterBoundsDefinition::new((60.00, 68.25), (31.75, 40.0), 0.25, 0.25, src_proj)?;
let target_bounds = RasterBoundsDefinition::new(
(2_320_000. - 4_000_000., 2_740_000. - 4_000_000.),
(5_090_000. - 4_000_000., 5_640_000. - 4_000_000.),
10_000.,
10_000.,
tgt_proj,
)?;
let warper = Warper::initialize::<CubicBSpline, _, _>(
&source_bounds,
&target_bounds,
)?;
let source_raster = Array2::zeros((34, 34));
let target_raster = warper.warp_ignore_nodata(&source_raster)?;
```