I have 5 raster layers depicting different temperature levels across a given geographic space. I need to use a common/same ‘Stretched” color ramp to show how this phenomenon varies across space, where a given color in the color scale in each of the raster layers represent same value in all the layers. Kindly see attached sample. I need it in a “stretched” style.I use ArcGIS 10.3.1
I have tried a couple of things which haven’t worked yet.
I made a dummy raster with values equivalent to the min-max of the 5 rasters. The lowest value of all the raster is 5 and the max is 74. So, I created a dummy raster with min value of 5 and max as 74. Layer properties-Symbology-I then symbolized the dummy with a color ramp of choice, choose -minimum-maximun- under “Stretch” and choose -From Custom Setting (below)- under setting under “Statistics”. Save the layer as layer file. lyr
The problem is that when I import the symbology or apply the layer file, all the raster retain same symbology and shows same min-max values (5 and 74). I need them to show their real values-such as 34 to 58 and the colors should reflect that range in the common color scale/symbology.
How do I go about this? I need a quick way out. I am not experienced in Python or other programming languages, but with detailed steps I can also try if that’s the only way out.
Thanks Acil for your prompt response.
I have actually applied that recommendation before my question. The challenge remains that while the min-max changes, the color ramp doesn't. The color does not align with the values for each color segment in the color spectrum. For instance, while 5 (the minimum value) is in the bluest color spectrum and 74 in the most red spectrum, when I apply that same symbology on a raster of mim-max of 30 and 55 respectively, it still has 30 at the bluest color and 55 as most red.: this is not what I want. 30 to still should exist within the green spectrum which is just inbetween blue and red. I believe there sis something I need touch yet. I still need get this done. It should be simple but am unsure why it's really hard now. Anyway, I am using ArcGIS 10.3.1. Could there be any difference?
I will appreciate further help.
Thanks again.
Thanks Acil.
I appreciate your responses. I was able to get the color match with the values. However, the High/Low values in the TOC are still those of the Dummy raster. That is, where I have a raster with min-max of 12-40 respectively, the High/Low value in the TOC continues to show 5-74 (High/Low of the dummy raster). The color code actually matched the values. This is a step forward anyhow. Is that how it works, or is there anything I didn't really do? Thanks a great deal.
If you would like to use the same stretching symbology for all raster layers, Nezha Acil's method is the way to go. One stretching legend for all raster. However, if you would like to indicate the min-max values in the TOC, I suggest the following way to work around.
1) In the layer properties of the dummy raster, use classified method in the symbology. Classified the values into many classes, with a stretching colour ramp. (screenshot 135)
2) Change the labels of the classes, show only some min/max values in-between. (screenshot 136). Apply this to other rasters. So, you could show only one colour symbology and the readers are easier to interpret the meaning of the colours.
Hope this help.
Did you try saving a layer file of the ideal raster symbology? After you create that .lyr file you can import it to the other rasters you want to match.
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