Clarify Breakline GeoPackage Requirement

Introduction

The current version of the Lidar Base Specification (LBS 2024 rev. A) requires delivery of breaklines in a GeoPackage format, includes more details regarding attribution, and adds a centerline requirement. Part of this requirement states that the GeoPakcage will contain up to six layers. GeoPackages are capable of supporting more than just six layers. The new requirement updates the quantity of allowable layers in the breakline GeoPackage to reflect the number of specific feature types in the deliverable, separating features into unique layers.

Current requirement:

In LBS 2024 rev. A: Breaklines:

Breaklines 

• The GPKG will contain up to six layers.
  • Waterbodies (polygon)
  • Rivers (polygon) 
  • Centerline (line) 
  • Ocean (polygon) 
  • Other Breaklines Lines (line)
  • Other Breaklines Polygons (polygon)
• If the project or work unit does not require one of the layers, such as Ocean, the contractors will not need to supply that layer. 
• Other Breaklines Lines: used for bridges, buildings, dams, waterfall, for example. 
• Other Breaklines Polygons: used for islands (unless depicted as holes within water polygons), bridges, buildings, dams, waterfalls, for example. 
• All features shall be Z- and M-value enabled. 

The current requirement will be replaced with:

(Modifications are in bold text.)

Breaklines 

• The GPKG shall contain a separate layer for each unique type of physical feature.
  • Waterbodies (polygon)
  • Rivers (polygon) 
  • Centerline (line) 
  • Ocean (polygon) 
  • Other Breaklines Lines (line/polyline) - additional layer(s) (used for bridges, buildings, dams, waterfall, for example) as needed and named to reflect the type of feature contained within the layer. The layer name should reflect the corresponding feature and only contain features for that physical feature. For example, bridge breakline feature should be within a layer named bridge that contains only bridge features.
  • Other Breaklines Polygons (polygon) - additional layer(s) (used for islands [unless depicted as holes within waterbody/river polygons], bridges, buildings, dams, waterfalls, for example) as needed and named to reflect the type of feature contained within the layer. The layer name shall reflect the corresponding features and only contain features for that physical feature. For example, island breaklines shall be within a layer named island that contains only island features.
• If the project or work unit does not require one of the layers, such as Ocean, the contractors will not need to supply that layer.    
• All features shall be Z- and M-value enabled.