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glue-viz / glue

Linked Data Visualizations Across Multiple Files
http://glueviz.org
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Need to avoid resetting NaN values to 0 #2035

Open kcariglia opened 5 years ago

kcariglia commented 5 years ago

I'm working on creating 2D images with data in which 0 is a valid measurement, and all NaN values in the array are necessary to represent the absence of data. Is there a way to avoid resetting NaNs to 0? Is there a way to graphically represent this by using any colormap (like jet) for numerical data and reserving a separate color setting (like clear or white) for NaNs?

astrofrog commented 5 years ago

@kcariglia - I thought we preserved NaN values - what format of data are you reading in? Is there any way you can share an example file with me?

kcariglia commented 5 years ago

I'm reading in hdf5 files, specifically TEC data which can be accessed via: http://cedar.openmadrigal.org/single/?isGlobal=on&categories=17&instruments=8000&years=2017&months=1&days=2

If you plot the TEC array, you will see that all NaN values are the same color as 0 values.