Applications

Browser demo

Open the demo. A Leaflet map in a projection of your choice (a local Lambert azimuthal equal-area by default, centred wherever you like) whose tiles are warped client-side from web map tiles, WMTS, ArcGIS tile services or a Cloud Optimized GeoTIFF. rwarp runs in a Web Worker, compiled to WebAssembly with the pure-Rust proj4rs backend: no server, no libproj.

The shim is rwarp-wasm/ in the repository. Its JavaScript API plans a source window and warps RGBA or float tiles:

const w = new Warper(srcCrs, srcGt, dstCrs, dstGt, maxError);
const win = w.source_window(dstW, dstH, srcW, srcH, padding);
const rgba = w.warp_rgba(srcRgba, srcW, srcH, xoff, yoff, dstW, dstH, "nearest");

Warper.withTransforms accepts CRS transforms as JavaScript functions, so a page can lend rwarp a projection library (proj4js, a PROJ build) when proj4rs declines a CRS. See rwarp-wasm/README.md.

cogcache

rwarp was extracted from cogcache, which plans warps from a target tile back to the source chunks it needs, and caches both the raw encoded source chunks and the warped target tiles. rwarp is the planning and resampling core.

Reference for array planning

The ArrIR design for portable array operation plans defines resampling independently of GDAL, and uses rwarp and gdalwarp together to pin down what gdalwarp actually does: how ties are broken, how edges are placed for curvilinear grids, where kernels widen. rwarp's fixtures are the evidence for those answers.

Using rwarp in your project

If you build on rwarp, an issue or pull request adding your project here is welcome.