Calculates a lat/lon grid over an area. More...

#include <GroundGrid.h>

Collaboration diagram for Isis::GroundGrid:

Public Member Functions
	GroundGrid (UniversalGroundMap *gmap, bool splitLatLon, bool extendGrid, unsigned int width, unsigned int height)
	This method initializes the class by allocating the grid, calculating the lat/lon range, and getting a default grid resolution. More...

virtual	~GroundGrid ()
	Delete the object. More...

void	CreateGrid (Latitude baseLat, Longitude baseLon, Angle latInc, Angle lonInc, Progress *progress=0)
	This method draws the grid internally, using default resolutions. More...

void	CreateGrid (Latitude baseLat, Longitude baseLon, Angle latInc, Angle lonInc, Progress *progress, Angle latRes, Angle lonRes)
	This method draws the grid internally. More...

void	WalkBoundary ()
	This draws grid lines along the extremes of the lat/lon box of the grid. More...

void	SetGroundLimits (Latitude minLat, Longitude minLon, Latitude maxLat, Longitude maxLon)
	This restricts (or grows) the ground range in which to draw grid lines. More...

bool	PixelOnGrid (int x, int y)
	Returns true if the grid is on this point. More...

bool	PixelOnGrid (int x, int y, bool latGrid)
	Returns true if the grid is on this point. More...

Latitude	minLatitude () const
	Returns the minimum latitude for the grid. More...

Longitude	minLongitude () const
	Returns the minimum longitude for the grid. More...

Latitude	maxLatitude () const
	Returns the maximum latitude for the grid. More...

Longitude	maxLongitude () const
	Returns the maximum longitude for the grid. More...

PvlGroup *	GetMappingGroup ()
	Returns a mapping group representation of the projection or camera. More...

Protected Member Functions
virtual bool	GetXY (Latitude lat, Longitude lon, unsigned int &x, unsigned int &y)
	This method converts a lat/lon to an X/Y. More...

UniversalGroundMap *	GroundMap ()
	Returns the ground map for children. More...

Private Member Functions
void	SetGridBit (unsigned int x, unsigned int y, bool latGrid)
	This flags a bit as on the grid lines. More...

bool	GetGridBit (unsigned int x, unsigned int y, bool latGrid)
	Returns true if the specified coordinate is on the grid lines. More...

void	DrawLineOnGrid (unsigned int x1, unsigned int y1, unsigned int x2, unsigned int y2, bool isLatLine)
	This sets the bits on the grid along the specified line. More...

Private Attributes
char *	p_grid
	This stores the bits of each pixel in the grid. More...

char *	p_latLinesGrid
	This stores the bits of each pixel in the grid. More...

char *	p_lonLinesGrid
	This stores the bits of each pixel in the grid. More...

unsigned int	p_width
	This is the width of the grid. More...

unsigned int	p_height
	This is the height of the grid. More...

unsigned long	p_gridSize
	This is width*height. More...

UniversalGroundMap *	p_groundMap
	This calculates single grid pts. More...

Latitude *	p_minLat
	Lowest latitude in image. More...

Longitude *	p_minLon
	Lowest longitude in image. More...

Latitude *	p_maxLat
	Highest latitude in image. More...

Longitude *	p_maxLon
	Highest longitude in image. More...

PvlGroup *	p_mapping
	The mapping group representation of the projection or camera. More...

double	p_defaultResolution
	Default step size in degrees/pixel. More...

bool	p_reinitialize
	True if we need to reset p_grid in CreateGrid. More...

bool	m_extendGrid
	If the grid should extend past the longitude domain boundary. More...

Detailed Description

Calculates a lat/lon grid over an area.

This class, given a universal ground map, area width and height, base lat/lon, lat/lon increments, and optionalls a progress and resolutions will calculate where grid lines should lie.

Author: 2010-01-06 Steven Lambright

History:: 2010-05-06 Steven Lambright - Added Split Lat/Lon functionality

History:: 2010-06-22 Steven Lambright - Improved handling of resolutions

History:: 2011-01-25 Steven Lambright - Now uses native units to the projection, Lat/Lon classes, and several bug fixes when it comes to out of range values or non-standard projection types.

History:: 2011-01-26 Steven Lambright - Fixed a bug where the grid was not consistent on the edges and added SetGroundLimits and WalkBoundary for the new grid options Bound lat/lon range.

History:: 2011-02-25 Steven Lambright - Min/Max Lat/Lons do not have to be known in the constructor any more

History:: 2011-12-08 Steven Lambright - Fixed a bug causing the longitude range to be incorrect. Fixes #607.

History:: 2014-06-06 Kristin Berry - Fixed a bug where lat/lon were swapped in the code. Fixes #2081.

History:: 2016-09-29 Jeannie Backer - Changed Latitude objects that were created with Latitude's mapping group constructor to have enum value Latitude::AllowPastPole. This was done for p_minLat in the GroundGrid constructor and for startLat in the CreateGrid() method. The reason for this is that these objects are copied to initialize another Latitude variable (lat) within for-loops that go past the poles. Thus lat must be allowed to go past the poles. This bug was uncovered when Latitude's virtual setAngle() method was fixed to match the signature of the parent method. Moved implementation of GroundMap() and GetMappingGroup() to the cpp file per ISIS coding standards.

History:: 2017-04-10 Jesse Mapel - Modified to not throw an exception when calculating longitude lines close to 90 or -90 latitude. Fixes #4766.

History:: 2017-06-28 Jesse Mapel - Added a flag to extend the grid past the longitude domain boundary. Fixes #2185.

Definition at line 58 of file GroundGrid.h.

Constructor & Destructor Documentation

◆ GroundGrid()

Isis::GroundGrid::GroundGrid	(	UniversalGroundMap *	gmap,
		bool	splitLatLon,
		bool	extendGrid,
		unsigned int	width,
		unsigned int	height
	)

This method initializes the class by allocating the grid, calculating the lat/lon range, and getting a default grid resolution.

Parameters

gmap	A universal ground map to use for calculating the grid
splitLatLon	Make two grids: one for latitude lines and one for longitude lines
extendGrid	If the grid should extend past the longitude domain boundary.
width	The width of the grid; often cube samples
height	The height of the grid; often cube samples

Definition at line 40 of file GroundGrid.cpp.

References Isis::PvlObject::findGroup(), Isis::Distance::meters(), and Isis::toDouble().

◆ ~GroundGrid()

Isis::GroundGrid::~GroundGrid ( )

virtual

Delete the object.

Definition at line 167 of file GroundGrid.cpp.

Member Function Documentation

◆ CreateGrid() [1/2]

void Isis::GroundGrid::CreateGrid	(	Latitude	baseLat,
		Longitude	baseLon,
		Angle	latInc,
		Angle	lonInc,
		Progress *	progress,
		Angle	latRes,
		Angle	lonRes
	)

This method draws the grid internally.

It is not valid to call PixelOnGrid until this method has been called.

Parameters

baseLat	Latitude to hit in the grid
baseLon	Longitude to hit in the grid
latInc	Distance between latitude lines
lonInc	Distance between longitude lines
progress	If passed in, this progress will be used
latRes	Resolution of latitude lines (in degrees/pixel)
lonRes	Resolution of longitude lines (in degrees/pixel)

Definition at line 239 of file GroundGrid.cpp.

References Isis::Progress::CheckStatus(), Isis::Angle::isValid(), Isis::Latitude::setErrorChecking(), and Isis::Progress::SetMaximumSteps().

◆ CreateGrid() [2/2]

void Isis::GroundGrid::CreateGrid	(	Latitude	baseLat,
		Longitude	baseLon,
		Angle	latInc,
		Angle	lonInc,
		Progress *	progress = `0`
	)

This method draws the grid internally, using default resolutions.

Parameters

baseLat	Latitude to hit in the grid
baseLon	Longitude to hit in the grid
latInc	Distance between latitude lines
lonInc	Distance between longitude lines
progress	If passed in, this progress will be used

Definition at line 218 of file GroundGrid.cpp.

◆ DrawLineOnGrid()

void Isis::GroundGrid::DrawLineOnGrid	(	unsigned int	x1,
		unsigned int	y1,
		unsigned int	x2,
		unsigned int	y2,
		bool	isLatLine
	)

private

This sets the bits on the grid along the specified line.

Parameters

x1	Start X
y1	Start Y
x2	End X
y2	End Y
isLatLine

Definition at line 730 of file GroundGrid.cpp.

◆ GetGridBit()

bool Isis::GroundGrid::GetGridBit	(	unsigned int	x,
		unsigned int	y,
		bool	latGrid
	)

private

Returns true if the specified coordinate is on the grid lines.

Parameters

x	X-Coordinate (0-based)
y	Y-Coordinate (0-based)
latGrid	True if you want to access the latitude grid where there are separate lat/lon grids. False for lon. Irrelevant if using a single grid.

Returns: bool Value at grid coordinate

Definition at line 691 of file GroundGrid.cpp.

◆ GetMappingGroup()

PvlGroup * Isis::GroundGrid::GetMappingGroup ( )

Returns a mapping group representation of the projection or camera.

This is useful for matching units with lat/lons.

Returns: Returns a mapping group representation of the projection or camera

Definition at line 546 of file GroundGrid.cpp.

◆ GetXY()

bool Isis::GroundGrid::GetXY	(	Latitude	lat,
		Longitude	lon,
		unsigned int &	x,
		unsigned int &	y
	)

protectedvirtual

This method converts a lat/lon to an X/Y.

This implementation converts to sample/line.

Parameters

lat	Latitude of Lat/Lon pair to convert to S/L
lon	Longitude of Lat/Lon pair to convert to S/L
x	Output sample (0-based)
y	Output line (0-based)

Returns: bool Successful

Definition at line 618 of file GroundGrid.cpp.

◆ GroundMap()

UniversalGroundMap * Isis::GroundGrid::GroundMap ( )

protected

Returns the ground map for children.

Definition at line 643 of file GroundGrid.cpp.

◆ maxLatitude()

Latitude Isis::GroundGrid::maxLatitude ( ) const

Returns the maximum latitude for the grid.

Returns: Latitude The maximum latitude for the grid. If no maximum has been set, then a default Latitude object is returned.

Definition at line 585 of file GroundGrid.cpp.

◆ maxLongitude()

Longitude Isis::GroundGrid::maxLongitude ( ) const

Returns the maximum longitude for the grid.

Returns: Longitude The maximum longitude for the grid. If no maximum has been set, then a default Longitude object is returned.

Definition at line 599 of file GroundGrid.cpp.

◆ minLatitude()

Latitude Isis::GroundGrid::minLatitude ( ) const

Returns the minimum latitude for the grid.

Returns: Latitude The minimum latitude for the grid. If no minimum has been set, then a default Latitude object is returned.

Definition at line 557 of file GroundGrid.cpp.

◆ minLongitude()

Longitude Isis::GroundGrid::minLongitude ( ) const

Returns the minimum longitude for the grid.

Returns: Longitude The minimum longitude for the grid. If no minimum has been set, then a default Longitude object is returned.

Definition at line 571 of file GroundGrid.cpp.

◆ PixelOnGrid() [1/2]

bool Isis::GroundGrid::PixelOnGrid	(	int	x,
		int	y
	)

Returns true if the grid is on this point.

Parameters

x	X-Coordinate of grid (0-based)
y	Y-Coordinate of grid (0-based)

Returns: bool Pixel lies on grid

Definition at line 529 of file GroundGrid.cpp.

◆ PixelOnGrid() [2/2]

bool Isis::GroundGrid::PixelOnGrid	(	int	x,
		int	y,
		bool	latGrid
	)

Returns true if the grid is on this point.

Using this method is recommended if lat/lon grids are separate.

Parameters

x	X-Coordinate of grid (0-based)
y	Y-Coordinate of grid (0-based)
latGrid	True for latitude lines, false for longitude lines

Returns: bool Pixel lies on grid

Definition at line 510 of file GroundGrid.cpp.

◆ SetGridBit()

void Isis::GroundGrid::SetGridBit	(	unsigned int	x,
		unsigned int	y,
		bool	latGrid
	)

private

This flags a bit as on the grid lines.

Parameters

x	X-Coordinate (0-based)
y	Y-Coordinate (0-based)
latGrid	True if this is derived from a latitude line

Definition at line 655 of file GroundGrid.cpp.

◆ SetGroundLimits()

void Isis::GroundGrid::SetGroundLimits	(	Latitude	minLat,
		Longitude	minLon,
		Latitude	maxLat,
		Longitude	maxLon
	)

This restricts (or grows) the ground range in which to draw grid lines.

Parameters

minLat	The lowest latitude extreme to draw grid lines to
maxLat	The highest latitude extreme to draw grid lines to
minLon	The lowest longitude extreme to draw grid lines to
maxLon	The highest longitude extreme to draw grid lines to

Definition at line 411 of file GroundGrid.cpp.

References Isis::Angle::isValid().

◆ WalkBoundary()

void Isis::GroundGrid::WalkBoundary ( )

This draws grid lines along the extremes of the lat/lon box of the grid.

Definition at line 434 of file GroundGrid.cpp.

References Isis::Latitude::setErrorChecking().

Member Data Documentation

◆ m_extendGrid

bool Isis::GroundGrid::m_extendGrid

private

If the grid should extend past the longitude domain boundary.

Definition at line 132 of file GroundGrid.h.

◆ p_defaultResolution

double Isis::GroundGrid::p_defaultResolution

private

Default step size in degrees/pixel.

Definition at line 129 of file GroundGrid.h.

◆ p_grid

char* Isis::GroundGrid::p_grid

private

This stores the bits of each pixel in the grid.

Definition at line 113 of file GroundGrid.h.

◆ p_gridSize

unsigned long Isis::GroundGrid::p_gridSize

private

This is width*height.

Definition at line 118 of file GroundGrid.h.

◆ p_groundMap

UniversalGroundMap* Isis::GroundGrid::p_groundMap

private

This calculates single grid pts.

Definition at line 119 of file GroundGrid.h.

◆ p_height

unsigned int Isis::GroundGrid::p_height

private

This is the height of the grid.

Definition at line 117 of file GroundGrid.h.

◆ p_latLinesGrid

char* Isis::GroundGrid::p_latLinesGrid

private

This stores the bits of each pixel in the grid.

Definition at line 114 of file GroundGrid.h.

◆ p_lonLinesGrid

char* Isis::GroundGrid::p_lonLinesGrid

private

This stores the bits of each pixel in the grid.

Definition at line 115 of file GroundGrid.h.

◆ p_mapping

PvlGroup* Isis::GroundGrid::p_mapping

private

The mapping group representation of the projection or camera.

Definition at line 127 of file GroundGrid.h.

◆ p_maxLat

Latitude* Isis::GroundGrid::p_maxLat

private

Highest latitude in image.

Definition at line 123 of file GroundGrid.h.

◆ p_maxLon

Longitude* Isis::GroundGrid::p_maxLon

private

Highest longitude in image.

Definition at line 124 of file GroundGrid.h.

◆ p_minLat

Latitude* Isis::GroundGrid::p_minLat

private

Lowest latitude in image.

Definition at line 121 of file GroundGrid.h.

◆ p_minLon

Longitude* Isis::GroundGrid::p_minLon

private

Lowest longitude in image.

Definition at line 122 of file GroundGrid.h.

◆ p_reinitialize

bool Isis::GroundGrid::p_reinitialize

private

True if we need to reset p_grid in CreateGrid.

Definition at line 131 of file GroundGrid.h.

◆ p_width

unsigned int Isis::GroundGrid::p_width

private

This is the width of the grid.

Definition at line 116 of file GroundGrid.h.

The documentation for this class was generated from the following files:

src/base/objs/GroundGrid/GroundGrid.h
src/base/objs/GroundGrid/GroundGrid.cpp

Public Member Functions

Protected Member Functions

Private Member Functions

Private Attributes

Detailed Description

Constructor & Destructor Documentation

◆ GroundGrid()

◆ ~GroundGrid()

Member Function Documentation

◆ CreateGrid() [1/2]

◆ CreateGrid() [2/2]

◆ DrawLineOnGrid()

◆ GetGridBit()

◆ GetMappingGroup()

◆ GetXY()

◆ GroundMap()

◆ maxLatitude()

◆ maxLongitude()

◆ minLatitude()

◆ minLongitude()

◆ PixelOnGrid() [1/2]

◆ PixelOnGrid() [2/2]

◆ SetGridBit()

◆ SetGroundLimits()

◆ WalkBoundary()

Member Data Documentation

◆ m_extendGrid

◆ p_defaultResolution

◆ p_grid

◆ p_gridSize

◆ p_groundMap

◆ p_height

◆ p_latLinesGrid

◆ p_lonLinesGrid

◆ p_mapping

◆ p_maxLat

◆ p_maxLon

◆ p_minLat

◆ p_minLon

◆ p_reinitialize

◆ p_width