GeoTIFF draws with latitude direction inverted

[guygriffiths]

I have a cloud-optimised GeoTIFF which plots fine in QGIS, but when I plot it using your example code, the lower co-ordinate becomes the upper co-ordinate and the image is drawn upside down from there.

I've put the code to reproduce the problem here: https://codepen.io/guygriffiths/pen/abyvJMz

As you can see, it's primarily stolen from your own example, with just a modified pixelValuesToColorFn.

If I run gdalinfo on it, I get the (probably pertinent) information:

Corner Coordinates:
Upper Left  (  318656.940, 9468502.080) ( 55d21'53.36"E,  4d48'23.59"S)
Lower Left  (  318656.940, 9495708.080) ( 55d21'55.42"E,  4d33'37.91"S)
Upper Right (  337988.940, 9468502.080) ( 55d32'20.76"E,  4d48'25.02"S)
Lower Right (  337988.940, 9495708.080) ( 55d32'22.60"E,  4d33'39.26"S)
Center      (  328322.940, 9482105.080) ( 55d27' 8.04"E,  4d41' 1.46"S)

whereby the "upper" corner is further south than the "lower" one. But, as I say, it works in QGIS, so the necessary information to plot it the right way up must be present somewhere.

Any help you can give me would be most appreciated.