in memory raster output

Douglas Long

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Jun 15, 2021, 11:52:42 AM6/15/21

to WhiteboxTools

Do Whitebox tools support writing to in-memory rasters?

Pseudo-code example below.

input_dem = "DEM.tif"

out_ram_raster = "in_memory_raster"

wbt.elev_percentile( input_dem, out_ram_raster , 15, 15)

final_output = "output.tif"
wbt.elev_percentile(out_ram_raster , final_output, 15, 15)

Jean-François Bourdon

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Jun 16, 2021, 10:09:26 AM6/16/21

to WhiteboxTools

Unfortunately not, each output/input must be written to disk as each call to WhiteboxTools lunches a new process that has no knowledge of what happened before. The closest you could currently get is to create a RAM disk (with ImDisk for example on Windows) and use it as your memory buffer but it's not the same as a reel in_memory raster. See also github.com/jblindsay/whitebox-tools/issues/52 and github.com/jblindsay/whitebox-tools/issues/68

Douglas Long

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Jun 16, 2021, 11:42:24 AM6/16/21

to WhiteboxTools

Can I create in-memory rasters VIA Rust? instead of CMD?

Jean-François Bourdon

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Jun 16, 2021, 2:38:43 PM6/16/21

to WhiteboxTools

I can't say... maybe that's something now possible with the new plugin capabilities added in v1.5 . One thing I've done in past is to write a new tool where I combined the source-code of the two tools (in your case, a loop of ElevPercentile). That way, everything stay in memory and you only have one read and one write on disk instead two of both... but that's not a very flexible solution. My reason to have done that was because the read/write process was taking more time than the actual processing and I wanted to save the useless 45 secondes of I/O between the two tools.

Douglas Long

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Jun 16, 2021, 2:53:41 PM6/16/21

to Jean-François Bourdon, WhiteboxTools

Good call!

I can write chained processes in the source code and compile.

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Douglas Long
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