org.opentripplanner.graph_builder.module.ned

Class NEDGridCoverageFactoryImpl

java.lang.Object

org.opentripplanner.graph_builder.module.ned.NEDGridCoverageFactoryImpl

All Implemented Interfaces:

ElevationGridCoverageFactory

public class NEDGridCoverageFactoryImpl
extends Object
implements ElevationGridCoverageFactory

A coverage factory that works off of the NED caches from NEDDownloader.

Field Summary

Fields

Modifier and Type	Field and Description
NEDTileSource	tileSource

Constructor Summary

Constructors

Constructor and Description
NEDGridCoverageFactoryImpl(File cacheDirectory)
NEDGridCoverageFactoryImpl(File cacheDirectory, NEDTileSource tileSource)

Method Summary

Modifier and Type	Method and Description
void	checkInputs()
void	fetchData(Graph graph) Verify that the needed elevation data exists in the cache and if it does not exist, try to download it.
org.opengis.coverage.Coverage	getGridCoverage() Creates a new thread-specific UnifiedGridCoverage instance with new Interpolator2D instances that wrap the underlying shared elevation tile data.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

tileSource

public final NEDTileSource tileSource

Constructor Detail

NEDGridCoverageFactoryImpl

public NEDGridCoverageFactoryImpl(File cacheDirectory)

NEDGridCoverageFactoryImpl

public NEDGridCoverageFactoryImpl(File cacheDirectory,
                                  NEDTileSource tileSource)

Method Detail

getGridCoverage

public org.opengis.coverage.Coverage getGridCoverage()

Creates a new thread-specific UnifiedGridCoverage instance with new Interpolator2D instances that wrap the underlying shared elevation tile data. During a refactor in the year 2020, the code at one point was written such that a new UnifiedGridCoverage instance was created with unique tile data for each thread to use. However, benchmarking showed that this caused longer run times which is likely due to too much memory competing for a slot in the processor cache.

Specified by:

getGridCoverage in interface ElevationGridCoverageFactory

checkInputs

public void checkInputs()

Specified by:

checkInputs in interface ElevationGridCoverageFactory

fetchData

public void fetchData(Graph graph)

Verify that the needed elevation data exists in the cache and if it does not exist, try to download it. The graph is used to determine the extent of the NED.

Specified by:

fetchData in interface ElevationGridCoverageFactory