com.imc.iss.maps

Class MapUtil

java.lang.Object

com.imc.iss.maps.MapUtil

public final class MapUtil
extends Object

Field Summary

Fields

Modifier and Type	Field and Description
static double	EARTH_RADIUS The radius of the earth used in all of the calculations, in meter

Constructor Summary

Constructors

Constructor and Description
MapUtil(BaseContext ctx)

Method Summary

Modifier and Type	Method and Description
static String	addLineString(String geojson, com.google.maps.model.LatLng[] latLngs) Add a LineString geometry object into the GeoJSON
static String	addLineString(String geojson, com.google.maps.model.LatLng[] latLngs, Map<String,Object> properties) Add a LineString geometry object into the GeoJSON with properties
static String	addLineString(String geojson, com.google.maps.model.LatLng[] latLngs, String typeUri) Add a LineString geometry object into the GeoJSON with a type
static String	addLineString(String geojson, com.google.maps.model.LatLng[] latLngs, String typeUri, Map<String,Object> properties) Add a LineString geometry object into the GeoJSON with a type and properties
static String	addPoint(String geojson, com.google.maps.model.LatLng latLng) Add a Point geometry object into the GeoJSON
static String	addPoint(String geojson, com.google.maps.model.LatLng latLng, Map<String,Object> properties) Add a Point geometry object into the GeoJSON with properties
static String	addPoint(String geojson, com.google.maps.model.LatLng latLng, String typeUri) Add a Point geometry object into the GeoJSON with a type
static String	addPoint(String geojson, com.google.maps.model.LatLng latLng, String typeUri, Map<String,Object> properties) Add a Point geometry object into the GeoJSON with a type and properties
static String	addTextString(String geojson, com.google.maps.model.LatLng latLng, String text) Add a TextString geometry object into the GeoJSON
static String	addTextString(String geojson, com.google.maps.model.LatLng latLng, String text, Map<String,Object> properties) Add a TextString geometry object into the GeoJSON with properties
static double	computeDistance(com.google.maps.model.LatLng p1, com.google.maps.model.LatLng p2) Compute the surface distance between two coordinates.
static double	computeDistanceToPolygon(com.google.maps.model.LatLng point, com.google.maps.model.LatLng[] polygon) Returns the closest distance between the given point and polygon.
static double	computeHeading(com.google.maps.model.LatLng from, com.google.maps.model.LatLng to) Compute the heading from point 1 to point 2.
static com.google.maps.model.LatLng	computeOffset(com.google.maps.model.LatLng from, double distance, double heading) Compute the coordinate of the point that would be the result of moving a certain distance from a point in the given direction.
static List<com.google.maps.model.LatLng[]>	getAllLineStringsVertices(String geojson, String typeUri) Gets the coordinates of the vertices of all the LineStrings that have been assigned a particular type.
static List<com.google.maps.model.LatLng>	getAllMarkersCoordinate(String geojson, String typeUri) Gets the coordinate of all the Points that have been assigned a particular type.
static List<com.google.maps.model.LatLng[]>	getAllPolygonsVertices(String geojson, String typeUri) Gets the coordinates of the vertices of all the Polygons that have been assigned a particular type.
static com.google.maps.model.LatLng	getClosestPointOnPolygon(com.google.maps.model.LatLng point, com.google.maps.model.LatLng[] polygon) Returns the coordinate on a polygon that is closest to the given point.
static Map<com.google.maps.model.LatLng,Double>	getElevations(com.google.maps.model.LatLng[] points) Retrieves the elevation data for the given coordinates.
static Object	getFeatureProperty(String geojson, String typeUri, String propertyName) Gets a property of the feature that has been assigned a particular type.
static com.google.maps.model.LatLng[]	getLineStringVertices(String geojson, String typeUri) Gets the coordinates of the vertices of the LineString that has been assigned a particular type.
static com.google.maps.model.LatLng	getMarkerCoordinate(String geojson, String typeUri) Gets the coordinate of the Point that has been assigned a particular type.
static com.google.maps.model.LatLng[]	getPolygonVertices(String geojson, String typeUri) Gets the coordinates of the vertices of the Polygon that has been assigned a particular type.
static com.google.maps.model.LatLng	interpolate(com.google.maps.model.LatLng from, com.google.maps.model.LatLng to, double fraction) Compute the coordinate of the point which lies the given fraction of the way between the origin and the ending point.
static boolean	isPointInsidePolygon(com.google.maps.model.LatLng point, com.google.maps.model.LatLng[] polygon) Checks if point lies on or inside a closed polygon.
static boolean	isUsingImperialUnits(String geojson) Whether the properties in the GeoJSON is in terms of Imperial units (i.e.
static boolean	isUsingMetricUnits(String geojson) Whether the properties in the GeoJSON is in terms of Metric units (i.e.
static com.google.maps.model.LatLng	projectPointToLine(com.google.maps.model.LatLng point, com.google.maps.model.LatLng line_endA, com.google.maps.model.LatLng line_endB) Compute the coordinate of the point which is the projection of a point to a line.
static String	removeFeatureById(String geojson, String id) Remove the feature that has the given feature id
static String	removeFeatureByType(String geojson, String typeURI) Remove the feature that has the given type
static String	updateFeatureProperty(String geojson, String typeURI, String propertyName, Object propertyValue) Updates the property of the feature that has the given type

Methods inherited from class java.lang.Object

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

Field Detail

EARTH_RADIUS

public static double EARTH_RADIUS

The radius of the earth used in all of the calculations, in meter

Constructor Detail

MapUtil

public MapUtil(BaseContext ctx)

Method Detail

addLineString

public static String addLineString(String geojson,
                                   com.google.maps.model.LatLng[] latLngs)

Add a LineString geometry object into the GeoJSON

Parameters:

geojson - The GeoJSON to be modified

latLngs - The list of coordinate points that makes up the LineString

Returns:

The updated GeoJSON string

addLineString

public static String addLineString(String geojson,
                                   com.google.maps.model.LatLng[] latLngs,
                                   Map<String,Object> properties)

Add a LineString geometry object into the GeoJSON with properties

Parameters:

geojson - The GeoJSON to be modified

latLngs - The list of coordinate points that makes up the LineString

properties - The list of key-value pairs to be set as the LineString's properties

Returns:

The updated GeoJSON string

addLineString

public static String addLineString(String geojson,
                                   com.google.maps.model.LatLng[] latLngs,
                                   String typeUri)

Add a LineString geometry object into the GeoJSON with a type

Parameters:

geojson - The GeoJSON to be modified

latLngs - The list of coordinate points that makes up the LineString

typeUri - The URI of the Geographical Line Type master data to assign for this LineString

Returns:

The updated GeoJSON string

addLineString

public static String addLineString(String geojson,
                                   com.google.maps.model.LatLng[] latLngs,
                                   String typeUri,
                                   Map<String,Object> properties)

Add a LineString geometry object into the GeoJSON with a type and properties

Parameters:

geojson - The GeoJSON to be modified

latLngs - The list of coordinate points that makes up the LineString

typeUri - The URI of the Geographical Line Type master data to assign for this LineString

properties - The list of key-value pairs to be set as the LineString's properties

Returns:

The updated GeoJSON string

addPoint

public static String addPoint(String geojson,
                              com.google.maps.model.LatLng latLng)

Add a Point geometry object into the GeoJSON

Parameters:

geojson - The GeoJSON to be modified

latLng - The coordinate of the Point

Returns:

The updated GeoJSON string

addPoint

public static String addPoint(String geojson,
                              com.google.maps.model.LatLng latLng,
                              Map<String,Object> properties)

Add a Point geometry object into the GeoJSON with properties

Parameters:

geojson - The GeoJSON to be modified

latLng - The coordinate of the Point

properties - The list of key-value pairs to be set as the Point properties

Returns:

The updated GeoJSON string

addPoint

public static String addPoint(String geojson,
                              com.google.maps.model.LatLng latLng,
                              String typeUri)

Add a Point geometry object into the GeoJSON with a type

Parameters:

geojson - The GeoJSON to be modified

latLng - The coordinate of the Point

typeUri - The URI of the Geographical Point Type master data to assign for this Point

Returns:

The updated GeoJSON string

addPoint

public static String addPoint(String geojson,
                              com.google.maps.model.LatLng latLng,
                              String typeUri,
                              Map<String,Object> properties)

Add a Point geometry object into the GeoJSON with a type and properties

Parameters:

geojson - The GeoJSON to be modified

latLng - The coordinate of the Point

typeUri - The URI of the Geographical Point Type master data to assign for this Point

properties - The list of key-value pairs to be set as the Point properties

Returns:

The updated GeoJSON string

addTextString

public static String addTextString(String geojson,
                                   com.google.maps.model.LatLng latLng,
                                   String text)

Add a TextString geometry object into the GeoJSON

Parameters:

geojson - The GeoJSON to be modified

latLng - The coordinate of the Point

text - Input text

Returns:

The updated GeoJSON string

addTextString

public static String addTextString(String geojson,
                                   com.google.maps.model.LatLng latLng,
                                   String text,
                                   Map<String,Object> properties)

Add a TextString geometry object into the GeoJSON with properties

Parameters:

geojson - The GeoJSON to be modified

latLng - The coordinate of the TextString

typeUri - The URI of the Geographical TextString Type master data to assign for this Point

properties - The list of key-value pairs to be set as the TextString properties

Returns:

The updated GeoJSON string

computeDistance

public static double computeDistance(com.google.maps.model.LatLng p1,
                                     com.google.maps.model.LatLng p2)

Compute the surface distance between two coordinates.

The calculation takes into account the curvature of the Earth (approximated as a perfect sphere)

Parameters:

p1 - The coordinate of the first point

p2 - The coordinate of the second point

Returns:

The surface distance in meter

computeDistanceToPolygon

public static double computeDistanceToPolygon(com.google.maps.model.LatLng point,
                                              com.google.maps.model.LatLng[] polygon)

Returns the closest distance between the given point and polygon. If the point lies inside or on the polygon, the value will be zero.

Parameters:

point - The coordinate of the Point

polygon - The coordinates array of the vertices of the Polygon

Returns:

The coordinate of the closest point

computeHeading

public static double computeHeading(com.google.maps.model.LatLng from,
                                    com.google.maps.model.LatLng to)

Compute the heading from point 1 to point 2.

The calculation takes into account the curvature of the Earth (approximated as a perfect sphere)

Parameters:

from - The coordinate of the origin point

to - The coordinate of the ending point

Returns:

The heading expressed in degrees clockwise from North within the range [-180,180)

computeOffset

public static com.google.maps.model.LatLng computeOffset(com.google.maps.model.LatLng from,
                                                         double distance,
                                                         double heading)

Compute the coordinate of the point that would be the result of moving a certain distance from a point in the given direction.

The calculation takes into account the curvature of the Earth (approximated as a perfect sphere)

Parameters:

from - The coordinate of the origin point

distance - The distance to move, in meter

heading - The direction to move, expressed in degrees clockwise from North within the range [-180,180)

Returns:

The coordinate of the resulting point

getAllLineStringsVertices

public static List<com.google.maps.model.LatLng[]> getAllLineStringsVertices(String geojson,
                                                                             String typeUri)

Gets the coordinates of the vertices of all the LineStrings that have been assigned a particular type.

If the GeoJSON does not contain such a LineString, it will return an empty List.

Parameters:

geojson - The GeoJSON to be read

typeUri - The URI of the type master data that has been assigned to the LineString

Returns:

List of the coordinates array of the vertices of the LineStrings

getAllMarkersCoordinate

public static List<com.google.maps.model.LatLng> getAllMarkersCoordinate(String geojson,
                                                                         String typeUri)

Gets the coordinate of all the Points that have been assigned a particular type.

If the GeoJSON does not contain such a Point, it will return an empty List.

Parameters:

geojson - The GeoJSON to be read

typeUri - The URI of the type master data that has been assigned to the Point

Returns:

List of the coordinates of the Points

getAllPolygonsVertices

public static List<com.google.maps.model.LatLng[]> getAllPolygonsVertices(String geojson,
                                                                          String typeUri)

Gets the coordinates of the vertices of all the Polygons that have been assigned a particular type.

If the GeoJSON does not contain such a Polygon, it will return an empty List.

Parameters:

geojson - The GeoJSON to be read

typeUri - The URI of the type master data that has been assigned to the Polygon

Returns:

List of the coordinates array of the vertices of the Polygon

getClosestPointOnPolygon

public static com.google.maps.model.LatLng getClosestPointOnPolygon(com.google.maps.model.LatLng point,
                                                                    com.google.maps.model.LatLng[] polygon)

Returns the coordinate on a polygon that is closest to the given point. If the point lies inside the polygon, it will just be the coordinate of the point itself.

Parameters:

point - The coordinate of the Point

polygon - The coordinates array of the vertices of the Polygon

Returns:

The coordinate of the closest point

getElevations

public static Map<com.google.maps.model.LatLng,Double> getElevations(com.google.maps.model.LatLng[] points)
                                                              throws IOException,
                                                                     com.google.maps.errors.ApiException,
                                                                     InterruptedException,
                                                                     IMCException

Retrieves the elevation data for the given coordinates.

Note, each call of this method will be charged. Thus, it is best to merge multiple points and retrieves their elevation data together, instead of making multiple calls for each individual points.

Parameters:

points - The list of coordinates to get elevation data for

Returns:

A map of coordinates to elevation data (in meter). Note that the coordinates in the output may not be exactly the same as the input coordinates, since Google has limited resolution for their elevation data

Throws:

IOException

com.google.maps.errors.ApiException

InterruptedException

IMCException

getFeatureProperty

public static Object getFeatureProperty(String geojson,
                                        String typeUri,
                                        String propertyName)

Gets a property of the feature that has been assigned a particular type.

If the GeoJSON does not contain such a feature or the feature does not have such a property, it will return null. If there are multiple features having the same type, only the property value of first one will be returned

Parameters:

geojson - The GeoJSON to be read

typeUri - The URI of the type master data that has been assigned to the feature

propertyName - The name of the property to retrieve

Returns:

The value of the property

getLineStringVertices

public static com.google.maps.model.LatLng[] getLineStringVertices(String geojson,
                                                                   String typeUri)

Gets the coordinates of the vertices of the LineString that has been assigned a particular type.

If the GeoJSON does not contain such a LineString, it will return null. If there are multiple LineStrings having the same type, only the coordinates of the vertices of the first one will be returned

Parameters:

geojson - The GeoJSON to be read

typeUri - The URI of the type master data that has been assigned to the LineString

Returns:

The coordinates array of the vertices of the LineString

getMarkerCoordinate

public static com.google.maps.model.LatLng getMarkerCoordinate(String geojson,
                                                               String typeUri)

Gets the coordinate of the Point that has been assigned a particular type.

If the GeoJSON does not contain such a Point, it will return null. If there are multiple Points having the same type, only the coordinate of first one will be returned

Parameters:

geojson - The GeoJSON to be read

typeUri - The URI of the type master data that has been assigned to the Point

Returns:

The coordinate of the Point

getPolygonVertices

public static com.google.maps.model.LatLng[] getPolygonVertices(String geojson,
                                                                String typeUri)

Gets the coordinates of the vertices of the Polygon that has been assigned a particular type.

If the GeoJSON does not contain such a Polygon, it will return null. If there are multiple Polygons having the same type, only the coordinates of the vertices of the first one will be returned

Parameters:

geojson - The GeoJSON to be read

typeUri - The URI of the type master data that has been assigned to the Polygon

Returns:

The coordinates array of the vertices of the Polygon

interpolate

public static com.google.maps.model.LatLng interpolate(com.google.maps.model.LatLng from,
                                                       com.google.maps.model.LatLng to,
                                                       double fraction)

Compute the coordinate of the point which lies the given fraction of the way between the origin and the ending point.

The calculation takes into account the curvature of the Earth (approximated as a perfect sphere)

Parameters:

from - The coordinate of the origin point

to - The coordinate of the ending point

fraction -

Returns:

The coordinate of the resulting point

isPointInsidePolygon

public static boolean isPointInsidePolygon(com.google.maps.model.LatLng point,
                                           com.google.maps.model.LatLng[] polygon)

Checks if point lies on or inside a closed polygon. Inside is defined as not containing the South Pole -- the South Pole is always outside

Parameters:

point - The coordinate of the point

polygon - The list of coordinates of the polygon's vertex

Returns:

The coordinate of the resulting point

isUsingImperialUnits

public static boolean isUsingImperialUnits(String geojson)

Whether the properties in the GeoJSON is in terms of Imperial units (i.e. feet and acre)

Parameters:

geojson - The GeoJSON to be read

isUsingMetricUnits

public static boolean isUsingMetricUnits(String geojson)

Whether the properties in the GeoJSON is in terms of Metric units (i.e. meter and hectare)

Parameters:

geojson - The GeoJSON to be read

projectPointToLine

public static com.google.maps.model.LatLng projectPointToLine(com.google.maps.model.LatLng point,
                                                              com.google.maps.model.LatLng line_endA,
                                                              com.google.maps.model.LatLng line_endB)

Compute the coordinate of the point which is the projection of a point to a line.

The calculation takes into account the curvature of the Earth (approximated as a perfect sphere)

Parameters:

point - The coordinate of the point

line_endA - The coordinate of the starting point of the line

line_endB - The coordinate of the ending point of the line

Returns:

The coordinate of the resulting point

removeFeatureById

public static String removeFeatureById(String geojson,
                                       String id)

Remove the feature that has the given feature id

Parameters:

geojson - The GeoJSON to be modified

id - The id of the feature

Returns:

The updated GeoJSON string

removeFeatureByType

public static String removeFeatureByType(String geojson,
                                         String typeURI)

Remove the feature that has the given type

Parameters:

geojson - The GeoJSON to be modified

typeUri - The URI of the type master data that has been assigned to the feature

Returns:

The updated GeoJSON string

updateFeatureProperty

public static String updateFeatureProperty(String geojson,
                                           String typeURI,
                                           String propertyName,
                                           Object propertyValue)

Updates the property of the feature that has the given type

Parameters:

geojson - The GeoJSON to be modified

typeUri - The URI of the type master data that has been assigned to the feature

propertyName - The name of the property to be updated

propertyValue - The value of the property to be updated

Returns:

The updated GeoJSON string