Contents
What can you do with symbology in ArcGIS Pro?
It is through the Symbology class that you can gain access to a feature layer’s renderer or a raster layer’s colorizer. The typical workflow is to reference a layer’s symbology, make changes, and then apply those changes back to the layer.
Can a symbology property be modified in ArcPy?
Therefore, if the symbology type does not fall in any of these four categories, the symbology property cannot be modified directly. It can only be modified using a preexisting .lyr file or a arcpy layer object that has the desired symbology.
How do I apply symbology to a raster?
Note: To access the symbology property of a feature or raster, a layer object must be created either using the arcpy.mapping module or Make Feature Layer (Data Management). This article describes two ways to apply symbology from an existing layer file, using the Layer object, or using the Apply Symbology From Layer geoprocessing tool.
Can you change the symbologytype on the layerobject?
The symbologyTypeon the Layerobject is a read-only property. In other words, you can’t change a raster classified symbology to a raster unique value symbology. You can only change the properties for a specific symbology class on a layer.
How does a script create a polygon symbol?
The script adds a dashed effect to the outline symbol layer for a polygon symbol. The script first gets the layer’s CIM definition. Next it gets the layer’s first symbol layer which is the outline symbol. If a layer effect is not present it creates one and then modifies the dashed effect. Finally, the CIM changes are pushed back to the layer.
How to find the description of a value in ArcMap?
A list of strings or numbers that represent the descriptions for each unique value that can optionally appear in a map document’s legend. These values are only accessible in the ArcMap user interface by right-clicking a symbol displayed within the Symbology tab in the Layer Properties dialog box and selecting Edit Description.
Is there a way to change the symbology type?
The only way to change the symbology type is by publishing the desired result to a layer file and using the UpdateLayer function. The valueField is used to change the field the unique values are based on.
Can a layer use any number of symbologies?
A layer can use any number of symbologies but not all of them can be modified. Not all layers will use the UniqueValuesSymbology class, so it is important to first test if the layer is using this symbology class before attempting to make changes to its properties.