3.4 Scale-Based Visibility & Layer Properties
Key Takeaways
- Scale-based visibility controls layer drawing based on map scale thresholds, preventing visual clutter at small scales and improving map redraw performance.
- Out Beyond (Minimum Scale) turns off a layer when zooming out past the threshold, whereas In Beyond (Maximum Scale) turns off a layer when zooming in closer than the threshold.
- Definition Queries use SQL WHERE clauses to filter feature display and analysis without altering or deleting records in the underlying data source.
- Display Filters suppress or alter feature rendering based on scale or attribute rules while leaving all features active in attribute tables and spatial analysis.
- Feature and layer blending modes dynamically merge overlapping graphics and stacked layers, controlling cartographic hierarchy without altering feature data.
A critical aspect of professional cartography and spatial database management is controlling when and how layers draw across different map scales. Displaying every detail of a dense dataset (such as fire hydrants or building footprints) when zoomed out to an entire state creates an unreadable black mass of symbols and degrades rendering performance. ArcGIS Pro provides robust layer control mechanisms including scale-based visibility, definition queries, display filters, and blending modes.
Map Scale Concepts & Scale Ranges
Map scale represents the ratio between a distance measured on the map and the corresponding distance on the ground (e.g., 1:24,000 means 1 unit on the map equals 24,000 units on Earth).
- Large Scale: Represents a small geographic area in high detail (e.g.,
1:1,000or1:5,000). The scale fraction denominator is small. - Small Scale: Represents a large geographic area in generalized detail (e.g.,
1:500,000or1:5,000,000). The scale fraction denominator is large.
Configuring Scale-Based Visibility
Scale-based visibility defines the scale range within which a layer draws. GIS analysts configure scale thresholds using the Appearance ribbon tab (Visibility group) or the General tab of Layer Properties:
Scale Threshold Configuration:
- Out Beyond (Minimum Scale): Zooming OUT beyond this scale turns the layer OFF.
- In Beyond (Maximum Scale): Zooming IN closer than this scale turns the layer OFF.
- Out Beyond (Minimum Scale): The scale limit when zooming out (toward smaller scales). If a layer has an Out Beyond threshold set to
1:100,000, zooming out to1:250,000causes the layer to turn off and disappear from the map view. - In Beyond (Maximum Scale): The scale limit when zooming in (toward larger scales). If a layer has an In Beyond threshold set to
1:1,000, zooming in closer to1:500causes the layer to turn off.
In the Contents pane, when a layer is suppressed by scale thresholds, its checkbox is grayed out, and a small scale-bar indicator icon appears next to it.
Layer Transparency & Tooltips
Layer visibility settings also include transparency and display field management:
- Layer-Level Transparency: Set on the Appearance ribbon tab using a percentage slider (0% = opaque, 100% = fully transparent). Applies uniformly across all symbols, outlines, and labels in the layer.
- Symbol-Level (Color) Transparency: Configured inside the Symbology pane for specific symbol components (e.g., setting a 50% transparent fill with an opaque 0% transparent black border).
- Display Field & Map Tooltips: Configured on the Display tab of Layer Properties. Sets the primary attribute field displayed when hovering over features (Map Tooltips) or identifying features in Pop-ups.
Definition Queries (SQL Filtering)
A Definition Query filters which features appear in the map view by evaluating a Structured Query Language (SQL) expression against the layer's attribute table.
Crucial Characteristics of Definition Queries:
- Non-Destructive: Definition queries do not delete, edit, or modify raw records in the underlying feature class or geodatabase table.
- Scope of Impact: Features excluded by a Definition Query are hidden from map display, excluded from the layer's attribute table, ignored by selection tools, and bypassed by geoprocessing tools that take the layer as input.
- Query Construction: Queries are built using the Clause Builder or SQL mode (e.g.,
STATUS = 'Active' AND POPULATION >= 50000). - Multiple Queries: Layers can store multiple named definition queries. Analysts can toggle between them or set scale-dependent definition queries.
Definition Queries vs. Display Filters
ArcGIS Pro includes Display Filters on the Symbology pane (Advanced Symbology Options tab), which differ fundamentally from Definition Queries:
Definition Queries vs. Display Filters:
+----------------------+---------------------------------+---------------------------------+
| Feature Property | Definition Query | Display Filter |
+----------------------+---------------------------------+---------------------------------+
| Map Rendering | Displays only matching features.| Displays only matching features.|
| Attribute Table | Hides non-matching records. | Shows ALL records. |
| Geoprocessing Input | Ignores non-matching features. | Processes ALL features. |
| Scale Dependency | Can be scale-dependent. | Designed for scale ranges. |
+----------------------+---------------------------------+---------------------------------+
- Definition Query: Excludes non-matching records from display, attribute tables, and geoprocessing operations.
- Display Filter: Restricts which features draw visually at specific scale ranges, but retains all features in the attribute table, spatial selections, and geoprocessing analysis. (e.g., displaying only major highway features at small scales while keeping minor roads accessible for network routing calculations).
Feature & Layer Blending Modes
Blending modes control how colors mix visually without altering underlying attribute values:
- Feature Blending: Manages how overlapping features within the same layer draw together (e.g., using Multiply mode to darken areas where multiple overlapping buffer rings intersect).
- Layer Blending: Manages how an entire layer blends visually with underlying map layers in the drawing order. For example, applying Multiply layer blending to a top vector land-use layer allows an underlying terrain hillshade raster to show through, creating a shaded 3D topographic relief effect.
Layer Drawing Order & Group Layers
- Drawing Order: Managed in the Contents pane under the List By Drawing Order tab. Layers draw from bottom to top (bottom layers are drawn first; top layers draw over them). Standard cartographic ordering puts points on top, lines below points, polygons below lines, rasters below vector polygons, and basemaps at the very bottom.
- Group Layers: Allow analysts to organize multiple related layers into a single container folder in the Contents pane. Turning off a Group Layer hides all sublayers simultaneously. Scale dependencies, transparency, and definition queries can be applied to the group layer as a whole.
A layer has its Out Beyond (Minimum Scale) threshold set to 1:50,000. What happens when the map view is zoomed out to 1:100,000?
What is a key difference between a Definition Query and a Display Filter in ArcGIS Pro?
A cartographer wants an underlying raster hillshade layer to show through an overlying vector soil polygon layer to create a 3D terrain appearance. Which property should be applied?