Package eu.europa.ec.eurostat.jgiscotools.grid

Class GridUtil

java.lang.Object

eu.europa.ec.eurostat.jgiscotools.grid.GridUtil

public class GridUtil
extends Object

A number of functions on grids.

Author:

julien Gaffuri

Constructor Summary

Constructors

Constructor	Description
GridUtil()

Method Summary

Modifier and Type	Method	Description
static void	assignDistanceToLines(Collection<Feature> cells, String distanceAttribute, org.locationtech.jts.index.strtree.STRtree linesInd, int decimalNB)	For eache cell, compute
static void	assignLandProportion(Collection<Feature> cells, String cellLandPropAttribute, org.locationtech.jts.index.SpatialIndex landGeometries, org.locationtech.jts.index.SpatialIndex inlandWaterGeometriesIndex, int decimalNB)	Compute for each cell the proportion of its area which is land area.
static void	assignRegionCode(Collection<Feature> cells, String cellRegionAttribute, Collection<Feature> regions, double toleranceDistance, String regionCodeAttribute)	Assign region codes to grid cells.
static void	filterCellsWithoutRegion(Collection<Feature> cells, String cellRegionAttribute)	Remove cells which are not assigned to any region, that is the ones with attribute 'cellRegionAttribute' null or set to "".
static org.locationtech.jts.geom.Geometry	getLandCellGeometry(Feature cell, org.locationtech.jts.index.SpatialIndex landGeometries, org.locationtech.jts.index.SpatialIndex inlandWaterGeometriesIndex)	Compute land geometry of a grid cell

Methods inherited from class java.lang.Object

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

Constructor Detail

GridUtil

public GridUtil()

Method Detail

assignRegionCode

public static void assignRegionCode(Collection<Feature> cells,
                                    String cellRegionAttribute,
                                    Collection<Feature> regions,
                                    double toleranceDistance,
                                    String regionCodeAttribute)

Assign region codes to grid cells. These regions could be countries or NUTS regions. If a grid cell intersects or is nearby the geometry of a region, then an attribute of the cell is assigned with this region code. For cells that are to be assigned to several regions, several region codes are assigned.

Parameters:

cells -

cellRegionAttribute -

regions -

toleranceDistance -

regionCodeAttribute -

filterCellsWithoutRegion

public static void filterCellsWithoutRegion(Collection<Feature> cells,
                                            String cellRegionAttribute)

Remove cells which are not assigned to any region, that is the ones with attribute 'cellRegionAttribute' null or set to "".

Parameters:

cells -

cellRegionAttribute -

assignLandProportion

public static void assignLandProportion(Collection<Feature> cells,
                                        String cellLandPropAttribute,
                                        org.locationtech.jts.index.SpatialIndex landGeometries,
                                        org.locationtech.jts.index.SpatialIndex inlandWaterGeometriesIndex,
                                        int decimalNB)

Compute for each cell the proportion of its area which is land area. The value is stored as a new attribute for each cell. This value is a percentage.

Parameters:

cells -

cellLandPropAttribute -

landGeometries -

inlandWaterGeometriesIndex -

decimalNB - The number of decimal places to keep for the percentage

getLandCellGeometry

public static org.locationtech.jts.geom.Geometry getLandCellGeometry(Feature cell,
                                                                     org.locationtech.jts.index.SpatialIndex landGeometries,
                                                                     org.locationtech.jts.index.SpatialIndex inlandWaterGeometriesIndex)

Compute land geometry of a grid cell

Parameters:

cell -

landGeometries -

Returns:

assignDistanceToLines

public static void assignDistanceToLines(Collection<Feature> cells,
                                         String distanceAttribute,
                                         org.locationtech.jts.index.strtree.STRtree linesInd,
                                         int decimalNB)

For eache cell, compute

Parameters:

cells -

distanceAttribute -

linesInd -

decimalNB -