ERC Overview

1
ERC Overview

• Bruce Robbins
• Session 2.3

2
ERC Environmental Runtime Component

• ERC General Overview
• Interacting with ERC
• What ERC provides
• What makes up ERC
• Terrain Topics
• Major services provided
• Earth Skin State
• Line of Sight
• Routing
• Terrain with OneSAF 1.5

3
ERC General Overview

• The ERC OneSAF Component
• Interacting with ERC
• net.onesaf.services.erc This package provides
  the implementation of the Environment Runtime
  Component.
• net.onesaf.services.erc.farm This package
  provides the implementation for the Feature
  Attribute Mapping.
• net.onesaf.services.erc.farm.test This package
  provides the implementation to test Feature
  Attribute Mapping.
• net.onesaf.services.erc.test This package
  provides the implementation for the off the
  database tests.

4
ERC General Overview

• The ERC OneSAF Component
• What we provide to OneSAF
• Services for synthetic environment queries
• Query and modify environmental features and
  attributes (terrain, ambient weather, ocean)
• Simple geometrical environment calculations
• Common API to access environmental information
• Interaction with environmental content
• Reasoning and planning within the environment
• Rely on static and dynamic environment
  information

5
ERC General Overview

• The ERC OneSAF Component
• What makes up ERC
• Feature and terrain services
• Environmental Data Models (EDM)
• Objective Terrain Format (OTF) spec
• Ultra High Resolution Buildings (UHRBs) spec
• OTF API
• Terrain testing tools
• Weather

6
Feature and Terrain Services

• Earth Skin State
• Provides information about the terrain at a
  particular location
• Input
• Location
• Elapsed simulation time
• Filter provided by API for increased performance
• Return data includes the unit normal,
  trafficability code, and height of terrain

7
Feature and Terrain Services

• Line of sight (LOS)
• Determines whether or not a clear, unobstructed
  line of sight exists between a viewpoint and a
  target point.
• Sampled Line of Sight
• Terrain Traversal Line of Sight (Ray-Trace)
• Attenuated Sampled Line of Sight
• Attenuated Terrain Traversal Line of Sight

8
Sample LOS
9
Sample vs Ray-Trace LOS
10
Environmental Data Models

• EDMs
• Terrain
• Extension of the WARSIM Terrain Common Data Model
  (TCDM)
• Describes the terrain features (point, linear,
  areal) and their attributes and attribute values
• Example Road feature with median width, soil
  type, trafficability surface type, width
• Ultra High Resolution Building (UHRB)
• Developed by OneSAF
• Describes the information about the UHRB and its
  attributes.
• Example Door with state information, length,
  width, construction type, shape

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Terrain Topics

• Objective Terrain Format
• Terrain generation
• Terrain testing
• Terrain databases delivered

12
Objective Terrain Format (.otf)

• Runtime format for use with OneSAF simulation
• Open-source
• Supported by multiple vendors as well as by
  internal compilers
• Constructive vs. virtual focus

13
Terrain Tools

• Terrain Generation
• ERC Compilers
• Delivered with OneSAF software
• Creates .otf from SEDRIS 3.1 STFs and properly
  attributed Shapefiles
• Basis for OTF API
• COTS Tools
• TerraSim
• Presagis (formerly Terrex)

14
Terrain Tools

• Testing
• ERC Standalone test driver
• Delivered as part of the software
• Manual testing
• Check triangle neighbors
• Check features
• UHRB checking
• Gnuplots of triangles, features, UHRBs
• Management and Control Tool (MCT)
• Running the database in the simulation
• Routing entities on the database and through
  UHRBs (as applicable)
• Add link to page on maintenance manual as pointer

15
Terrain Databases

• Provided Databases for 1.5
• JRTC with MOUT site UHRBs
• JNTC with UHRBs and ocean
• Ft Hood
• Korea
• Mosul
• Fallujah
• Algorithmic (golden) database

16
ERC Static Weather Databases

• Utilizes WARSIM legacy weather databases and
  runtime code
• Provides 4 weather databases (winter, spring,
  summer, and fall)
• 14 consecutive days of data at 6 hour interval
  for each season
• Each contains data for the entire globe
  (represented in global coordinates)
• Spatially organized
• Includes ocean data where applicable
• ERC does not have weather models
• Example of data found
• Temperature, wind speed, precipitation, cloud
  levels

17
Dynamic Weather Edits

• ERC weather can be edited during runtime
• Edits are made for a single attribute

18
Questions

• Bruce Robbins
• bruce.e.robbins_at_us.army.mil
• 407-384-3866

19
Backup Algorithmic database
20
All Features
21
Ramp Section
22
Sloped Section
23
Trafficability Quilt