How to avoid compression when converting GeoTIFF to MBTiles?

Asked Jan 25 '21 at 12:49

Active Jan 25 '21 at 12:49

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I have been trying to convert a set of GeoTIFF files into MBTiles using gdal_translate (GDAL 3.0.4). My command looks as follows:

gdal_translate -of MBTiles -ot Byte -strict -scale 0 255 bogota.tif bogota.mbtiles

The GeoTIFF image is successfully converted to MBTiles, and I am able to render it using QGIS. However, it appears that the result is somewhat compressed, or that the new image has lost some resolution. I have been experimenting with the -outsize option and trying to force it to 100% of the original size of the image, but with no success.

Is there a way to make sure that the result maintains the full resolution in the output?

Here are some screenshots to compare the results:

Before

After

Note: GeoTIFF image is taken from the following link: https://download.osgeo.org/geotiff/samples/made_up/bogota.tif

asked Jan 25 '21 at 12:49

Filip Östermark

1

adding `-co "ZOOM_LEVEL_STRATEGY=UPPER"` helps a little – YevKad Jan 25 '21 at 15:25
@YevKad It does! Thank you. However there is still a bit of blur in the output. But perhaps I should investigate zoom levels a bit further. – Filip Östermark Jan 25 '21 at 15:40
2

changing `-co "RESAMPLING=NEAREST"` removes the blur but still not the same as original – YevKad Jan 25 '21 at 15:50
I found that a combination of the two works quite well. Still different from the original image, but this seems to give me the most accurate output so far. – Filip Östermark Jan 25 '21 at 16:39

How to avoid compression when converting GeoTIFF to MBTiles?

Before

After

0 Answers0