GIS Question of the Day #1: Map Level Symbology and Layer Level Symbology

𝗤𝘂𝗲𝘀𝘁𝗶𝗼𝗻:

In ArcGIS, what is difference between map level symbology and layer level symbology?

𝗔𝗻𝘀𝘄𝗲𝗿:

In ArcGIS, symbology refers to the visual appearance of features on a map. There are two main types of symbology: map level symbology and layer level symbology.

Map Level Symbology

• Definition: Map level symbology is applied to the entire map as a whole. This includes base maps, overall styles, and global settings that affect the appearance of all layers on the map.
• Usage: It is used to set the general visual context and ensure that the map has a consistent appearance. This includes the background color, grid lines, labels, and other elements that are not specific to individual layers but affect the entire map.
• Example: Changing the background color of the map, setting a specific style for grid lines, or applying a global scale-dependent visibility.

Layer Level Symbology

• Definition: Layer level symbology is applied to individual layers within the map. Each layer can have its own unique symbology settings that control how the features in that layer are displayed.
• Usage: It is used to highlight or distinguish specific features within a layer. This includes color, shape, size, and pattern of symbols, as well as labeling and other feature-specific visual attributes.
• Example: Assigning different colors to different categories of features within a layer, such as different land use types, or setting specific symbols for point features like schools or hospitals.

Key Differences

• Scope:
  • Map Level: Affects the entire map.
  • Layer Level: Affects only the specific layer.
• Purpose:
  • Map Level: Provides a consistent visual framework for the map.
  • Layer Level: Differentiates features within a layer.
• Flexibility:
  • Map Level: Limited to overarching settings.
  • Layer Level: Highly customizable for each layer.

Understanding these differences allows for effective map design in ArcGIS, ensuring that both the overall map and individual features are visually informative and appealing.

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