Re: [Qgis-user] Styles for Extremely Small-Value Rasters

Nicolas Cadieux Fri, 03 Apr 2015 14:24:13 -0700

That should not be the case. Send me a clip of your raster and I will take care of it.

Nicolas Cadieux M.Sc.
Les Entreprises Archéotec inc.
8548, rue Saint-Denis Montréal H2P 2H2
Téléphone: 514.381.5112 Fax: 514.381.4995
www.archeotec.ca

Le 2015-04-03 15:31, Michael Treglia <[email protected]> a écrit :

Nicolas,

Thanks for the quick response. I might be mis-understanding your suggestion, so let me know if that seems to be the case.

The problem isn't specifying the min/max values (Loading the Min/Max values from the raster is not a problem). The problem is that the color ramp doesn't seem to interpret decimals at such fine precision. Since all of the numbers in the raster are so close to 0, even when I enter specific values for the color ramp to use (as the 'Value' next to the individual colors), with such small numbers they all seem to just be recognized as 0.

In case it helps , this is QGIS 2.8.1 Win64 (on Windows 7).

Thanks again!
mike

On Fri, Apr 3, 2015 at 2:13 PM, Nicolas Cadieux <[email protected]> wrote:
Hi,
You can manually place the min and max values. Since the screen is limited to 256 values, you will need to decide what values to display. If 0 is null, you should indicate that in the raster properties. That will help with the classification.

Nicolas Cadieux M.Sc.
Les Entreprises Archéotec inc.
8548, rue Saint-Denis Montréal H2P 2H2
Téléphone: 514.381.5112 Fax: 514.381.4995
www.archeotec.ca

Le 2015-04-03 14:54, "mtreg [via OSGeo.org]" <[hidden email]> a écrit :

Hi All,

I had a raster output from a kernel density estimate I produced in R (using the adehabitatHR package). I imported the layer to QGIS, and it displays by default without any issue (Rener type: Singleband Gray).

However, when I try changing this to color (Render type: Singleband pseudocolor), I can't get the gradient in values to display. Since it is a Kernel Density Estimate result, the values are all extremely low, covering a fairly large area. The range of values is 0 to 6.4773e-10. When I either use the 'Classify' button to set value ranges to specific colors, all of the values stay at 0. When I enter the small values into the classification Value field by hand, the display does not change.

Increasing the values by multiplying the layer makes it feasible and plots okay, but I'd rather keep values to the originals/not go through an extra step.

Anybody have success with plotting rasters with extremely small values with different color ramps?

Any suggestions are appreciated...

Thanks,
Mike

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Re: [Qgis-user] Styles for Extremely Small-Value Rasters

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