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Using a raster function to set symbology

Gianna_BBSRC

Hi everyone,

I'm trying to set the symbology on several hundred .tiff raster files.

I need to customize the statistics and would like to symbolize using a stretch MinMax function on each raster.

So I've set up the custom statistics in the raster function as below:

From there, I've tried every combination of using Stretch and ColorMap functions but the result ends up with a classified symbology ranging from 0-255

Any ideas?

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OlivierLefevre

I aim to achieve the same goal as Gianna_BBSRC about publishing with correct symbology (Stretch Min-Max and ColoRamp).

Export as function raster function template from the Symbology tool behave the same as AndrewRitchie_CoL noticed back in 2021.

Did someone find a solution ?

‎

AndrewRitchie_CoL

Thanks. I can see that we are trying to apply two different visual functions, so they can't be chained. But the stretch function should allow you to apply a colour ramp.

It's also supposed to be possible from the Symbology tool:

But this method doesn't work for me either. It manages to apply the correct color ramp, but seems to now think it's an RGB raster, and I lose access to the original band data.

Time to lodge a case for this method - or try and hack the Raster Function xml 😕

Gianna_BBSRC

Hi Andrew,

No dice, I'm afraid. It seems like pretty buggy behaviour to me.

AndrewRitchie_CoL

Did you ever find a solution Giannalogy?

I'm trying to publish an image service, with a predefined stretch/colour ramp and came up with the same workflow.

I've built the Raster Function template, but cannot get the Colormap and Stretch tools to work together - so I end up with the classified raster, same as you.

Gianna_BBSRC

I refer to the ColorMap raster function, which has colorRamp as an option within it

I have found a workaround to this by attaching a processing template which calcs the statistics (and does nothing else) and then set the rendering defaults to my desired symbology within ArcGIS Pro.

But I'm looking for a solution to this symbology issue with raster functions because I'd like to publish it as an image service and have the correct symbology already applied instead of using client-side rendering to change the vis (which is was I'm doing now in Esri JS API)

danretired

Raster rendering behavior—ArcGIS Pro | Documentation

the default resampling method is bilinear and the default stretch is minimum-maximum.

That is why I wonder why you mention ColorMap instead of ColorRamp

Gianna_BBSRC

Yep but I've set my Raster and Imagery defaults to a different colorramp, should have mentioned. It would typically default to grayscale, but still be classified instead of stretch

danretired

If you did it manually, and it is single band, float, I would have expected a gray scale image ie a color ramp, then stretched

Gianna_BBSRC

Hi Dan,

Singe-band 32-bit floats

mins and maxes somewhere in the ranges from 0-1000 of different meteorological indicators

rasters in sets of four cover the same min/max ranges, 420 maps total

danretired

Are they singleband tiff files?

Are the data integer or floating point?

What are the expected min and max's?

Do all rasters cover basically the same min and max range?

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