Offset raster layer with ArcGIS source in OpenLayers?

Question

In my case there are two layers:

• raster from ArcGIS REST service (red) and
• vector in MVT format (blue)

The problem is that the raster layer is offset from the vector layer. It is assumed that the vector is more correct. Therefore, I need to "move" the raster layer a bit.

Is there a way this can be done in OpenLayers?

Reprojection doesn't seem to be the right thing to dig into, because both layers have the same original projection of EPSG:3857 (the red one is EPSG:102100). But maybe some custom projection with some transformation functions? Idk. I just need some guidance on this matter.

Answer 1

This may not be the most elegant solution in context of OpenLayers, but for the time it is what I ended up with. And it is not to change or transform the layer itself, but to change URL of ArcGIS exported tile (thanks to @Mike for the help). What you do is you alter tile bounding box in a private method of a ol/source/TileArcGISRest class. The method is getRequestUrl_().

import TileArcGISRest from 'ol/source/TileArcGISRest';

export default class CustomTileArcGISRest extends TileArcGISRest
{
   getRequestUrl_(
        tileCoord,
        tileSize,
        tileExtent,
        pixelRatio,
        projection,
        params
    ) {

        // Altering tileExtent
        var xOffset = -1;
        var yOffset = -4.5;
        tileExtent = tileExtent.map((n, i) => i % 2 ? n + yOffset : n + xOffset);

        return super.getRequestUrl_(
            tileCoord,
            tileSize,
            tileExtent,
            pixelRatio,
            projection,
            params
        );
    }
}

tileExtent is in a form of an array, like [xmin, ymin, xmax, ymax], where xmin, ymin are floats.