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Reprojecting raster tiles, output doubles in size

7 years ago
March 13, 2019
26 replies
179 views

+10

bjudes
Enthusiast

Hi,

I have a set of 250 raster tiles, I have reprojected them from ITM to WGS84, before reprojection each tile was 87,215KB. After reprojection the tiles are roughly 180,000KB. Why has this happened? My workbench is included here, I first mosaicked the tiles then reprojected and finally clipped back to the tile boundaries.

Thanks for any help.

B

Best answer by takashi

A possible reason is that the source raster data is compressed whereas the destination raster data is not compressed.

Check if the source raster data is compressed with some method. You can see the compression method in the Feature Information window of FME Data Inspector, if it was compressed.

e.g.

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+10

bjudes
Author
Enthusiast
7 years ago
March 25, 2019

It seems that Windows Explorer ignores Nodata definition. It's just a preview anyway, I don't think it would cause any practical issues on using the data.

Great stuff, thank you.

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