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I'm using QGIS 3.12. I'd like to reproject NASA's Black Marble GeoTIFF (3600x1800 (0.1 degrees)) from https://earthobservatory.nasa.gov/features/NightLights/page3.php. The original projection is EPSG:4326. I would like to reproject it to EPSG:3857. Ultimately I'm going to take this reprojected GeoTiff into MapTiler to create basemap tiles.

I opened a new project in QGIS and dragged the GeoTiff onto a layer. I went to Raster > Projection > Warp, which pulled up this dialogue window:

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There is no dropdown option for EPSG:3857 as a Target CRS. How might I set this target projection?

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    Press the Earth icon and you'll find more options. – user30184 Mar 23 at 7:49
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Hit the button to the right of the dropdown, the globe with the hat - there you may browse and search (just enter the EPSG code) all CRS available in your QGIS.

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