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Open-EO / openeo-processes

Interoperable processes for openEO's big Earth observation cloud processing.
https://processes.openeo.org
Apache License 2.0
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Histogram process #41

Open jdries opened 5 years ago

jdries commented 5 years ago

In some of our zonal statistics use cases, we compute histograms. I believe this is basically a type of reducer. When the input data cube uses a type with a limited range, like byte, we compute a histogram with 256 buckets, and keep track of nodata. For float/double data types, we might need user definded buckets.

m-mohr commented 5 years ago

Could you come up with a concrete JSON-based proposal? If it's required for the four core use cases it should be in the 0.4 release.

jdries commented 5 years ago

I don't think it needs to be in 0.4!

m-mohr commented 4 years ago

@jdries Could you come up with a concrete JSON-based proposal for the next version?

m-mohr commented 4 years ago

Telco: Agreed to add. Not sure whether it's a reducer though, depends on the outcomes of #73, I guess. If there's a volunteer to help define this function, I'd appreciate it.

bossie commented 4 years ago

Histogram as a reducer process with discrete buckets might look like this: #97. No user-defined buckets are supported yet.

m-mohr commented 3 years ago

Seems to be relevant for UC3 (Platform), so giving it some priority. @jdries

m-mohr commented 2 years ago

Would this really go through reduce_dimension? I think it might need to go through apply_dimension (with a target_dimension?) instead as the histogram returns more than a single value, right?