I am trying to make a simple map of the world in ArcMap 10.1, and I have a shapefile with all the countries in it. I have the symbology set to unique values, so the countries are all different colors. I want to add a gradient fill, but I can't add the gradient to its symbology without going through every single country and editing it. If I select Properties for All Symbols, it will apply the same color to every unique value. Any ideas?
[GIS] How to apply a gradient fill to different polygons in the same layer
arcgis-desktopsymbology
Related Solutions
You could definitely do as Johns describes and create an additional field to be your symbol field based on the other three attributes. This could be done by using the field calculator with VB or python. Set the parser as Python, Click "Show Codeblock" For example:
Using if and else statements you can populate your new symbology field with integers or text. Based on this text, you can set your symbology
def symbology (field1, field2, field3):
#if your 1st field is equal to "sometext" and field 2 is equal to 0.25 populate symbology field with one
if (field1 == "sometext" and field2 == 0.25):
return 1
elif (field1 == "PINE" and field3 > 10):
return 2
#if none of the above conditions are met, return 3
else:
return 3
under your new field = write:
symbology(!field1!, !field2!, !field3!)
As an additional note, make sure none of your if/else conditions overlap or your won't get the correct values!
Hope this helps
You can do it from Symbology tab, just click in More to access to Format all symbols:
If you want to format just some symbols, select them (you can use SHIFT or CONTROL to select several items), right click and select Format symbol(s)
Best Answer
A workaround could be to use the transparency. You first use unique color values , then you create a second layer from the same dataset on top of the first layer, with a grey gradient and some transparency.