You are probably trying to load the whole file. Dependending on the size of the file, this could take a long time. You may consider converting your GeoTIFF into a Cloud Optimized GeoTIFF and loading the url. Here's an example of loading a COG: https://geotiff.github.io/georaster-layer-for-leaflet-example/examples/load-cog-via-script-tag.html. If that's still not fast enough, you may consider creating overviews for every zoom level.
Sometimes your GeoTIFF doesn't load because the projection is not supported by georaster-layer-for-leaflet. In order to fix this, you can install gdal and run the following command: gdalwarp -t_srs EPSG:4326 imagery.tif imagery_4326.tif, which will create a new GeoTIFF file in the 4326 projection, supported by this library. If that doesn't fix it, feel free to email me at [email protected] for assistance.
GeoRasterLayer looks for proj4 when you have loaded a raster (e.g. GeoTIFF) that isn't in the 3857 or 4326 projection. This is because it needs to reproject coordinates on your Leaflet map into coordinates in the projection of your raster. In order to solve this, you can either reproject your GeoTIFF into EPSG:4326 (like the answer above shows) or you can add proj4 to the globals, which is done with adding the following script to your document head:
<script src="https://unpkg.com/proj4"></script>You will first have to install gdal and then run the following commands, assuming you start with a GeoTIFF named example.tif:
gdal_translate example.tif cog.tif -co TILED=YES -co COMPRESS=DEFLATE
gdaladdo -r average cog.tif 2 4 8 16 32This is a community project and doesn't work without contributions from people like you. You're welcome to add this question via a Github Pull Request.