fix(weather): upright N. America cloud tiles; lift shells over coarse 3D tiles (#730)

src/layers/weather/infraredImage.js

@@ -4,13 +4,21 @@ import { infraredAlpha } from './infraredAlpha.js';
 
 export const MAX_MOSAIC_BYTES = 4 * 1024 * 1024;
 
-/** Apply the display transfer once to a decoded image. */
-export function processInfraredImage(image, mode, createCanvas) {
+/** Apply the display transfer once to a decoded image; `flipY` draws a
+ * bottom-up image back upright. */
+export function processInfraredImage(
+  image,
+  mode,
+  createCanvas,
+  { flipY = false } = {},
+) {
   const canvas = createCanvas();
   canvas.width = image.width;
   canvas.height = image.height;
   const context = canvas.getContext('2d');
+  if (flipY) context.setTransform(1, 0, 0, -1, 0, image.height);
   context.drawImage(image, 0, 0);
+  if (flipY) context.setTransform(1, 0, 0, 1, 0, 0);
   const pixels = context.getImageData(0, 0, canvas.width, canvas.height);
   pixels.data.set(infraredAlpha(pixels.data, mode));
   context.putImageData(pixels, 0, 0);