DEMInterpolator Class Reference

Public Member Functions
	DEMInterpolator (float height=0.0, int epsg=4326)
	Constructor with custom reference height and bilinear interpolation.
	DEMInterpolator (float height, isce3::core::dataInterpMethod method, int epsg=4326)
	Constructor with custom reference height and custom interpolator method.
isce3::error::ErrorCode	loadDEM (isce3::io::Raster &demRaster, double min_x, double max_x, double min_y, double max_y, const int dem_raster_band=1)
	Read in subset of data from a DEM with a supported projection.
void	loadDEM (isce3::io::Raster &demRaster, const int dem_raster_band=1)
	Read in entire DEM with a supported projection.
void	declare () const
void	computeMinMaxMeanHeight (float &minValue, float &maxValue, float &meanValue)
	Compute min, max, and mean DEM height.
double	interpolateLonLat (double lon, double lat) const
	Interpolate at a given longitude and latitude.
double	interpolateXY (double x, double y) const
	Interpolate at native XY coordinates of DEM.
double	xStart () const
	Get starting X coordinate.
void	xStart (double xstart)
	Set starting X coordinate.
double	yStart () const
	Get starting Y coordinate.
void	yStart (double ystart)
	Set starting Y coordinate.
double	deltaX () const
	Get X spacing.
void	deltaX (double deltax)
	Set X spacing.
double	deltaY () const
	Get Y spacing.
void	deltaY (double deltay)
	Set Y spacing.
double	midX () const
	Get mid X coordinate.
double	midY () const
	Get mid Y coordinate.
cartesian_t	midLonLat () const
	Get mid longitude and latitude.
bool	haveRaster () const
	Flag indicating whether a DEM raster has been loaded.
double	refHeight () const
	Get reference height of interpolator.
void	refHeight (double h)
	Set reference height of interpolator.
bool	haveStats () const
	Flag indicating if stats are already known.
float	meanHeight () const
	Get mean height value.
float	maxHeight () const
	Get max height value.
float	minHeight () const
	Get min height value.
float *	data ()
	Get pointer to underlying DEM data.
const float *	data () const
	Get pointer to underlying DEM data.
size_t	width () const
	Get width of DEM data used for interpolation.
void	width (int width)
	Set width of DEM data used for interpolation.
size_t	length () const
	Get length of DEM data used for interpolation.
void	length (int length)
	Set length of DEM data used for interpolation.
int	epsgCode () const
	Get EPSG code for input DEM.
void	epsgCode (int epsgcode)
	Set EPSG code for input DEM.
isce3::core::ProjectionBase *	proj () const
	Get Pointer to a ProjectionBase.
isce3::core::dataInterpMethod	interpMethod () const
	Get interpolator method enum.
void	interpMethod (isce3::core::dataInterpMethod interpMethod)
	Set interpolator method enum.

Member Function Documentation

computeMinMaxMeanHeight()

void isce3::geometry::DEMInterpolator::computeMinMaxMeanHeight	(	float &	minValue,
		float &	maxValue,
		float &	meanValue )

Compute min, max, and mean DEM height.

Parameters

[out]	minValue	Minimum DEM height
[out]	maxValue	Maximum DEM height
[out]	meanValue	Mean DEM height

This method will also set refHeight to meanValue so that this object is guaranteed to return a value h : minValue <= h <= maxValue even if the query point is out of bounds.

If stats have already been computed then no calculation is done.

interpolateLonLat()

double isce3::geometry::DEMInterpolator::interpolateLonLat	(	double	lon,
		double	lat ) const

Interpolate at a given longitude and latitude.

Parameters

[in]	lon	Longitude of interpolation point.
[in]	lat	Latitude of interpolation point.

Interpolate DEM at a given longitude and latitude

interpolateXY()

double isce3::geometry::DEMInterpolator::interpolateXY	(	double	x,
		double	y ) const

Interpolate at native XY coordinates of DEM.

Parameters

[in]	x	X-coordinate of interpolation point.
[in]	y	Y-coordinate of interpolation point.

Interpolate DEM at native coordinates

loadDEM() [1/2]

void isce3::geometry::DEMInterpolator::loadDEM	(	isce3::io::Raster &	demRaster,
		const int	dem_raster_band = 1 )

Read in entire DEM with a supported projection.

Parameters

[in]	dem_raster	DEM raster
[in]	dem_raster_band	DEM raster band (starting from 1)
[in]	demRaster	input DEM raster to subset

Loads the entire DEM

loadDEM() [2/2]

isce3::error::ErrorCode isce3::geometry::DEMInterpolator::loadDEM	(	isce3::io::Raster &	demRaster,
		double	min_x,
		double	max_x,
		double	min_y,
		double	max_y,
		const int	dem_raster_band = 1 )

Read in subset of data from a DEM with a supported projection.

Parameters

[in]	dem_raster	DEM raster
[in]	minX	Minimum X/easting position
[in]	maxX	Maximum X/easting position
[in]	minY	Minimum Y/northing position
[in]	maxY	Maximum Y/northing position
[in]	dem_raster_band	DEM raster band (starting from 1)
[in]	demRaster	input DEM raster to subset
[in]	min_x	Easting/Longitude of western edge of bounding box
[in]	max_x	Easting/Longitude of eastern edge of bounding box
[in]	min_y	Northing/Latitude of southern edge of bounding box
[in]	max_y	Northing/Latitude of northern edge of bounding box

Returns

Error code

Loads a DEM subset given the extents of a bounding box

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

• /home/runner/work/isce3/isce3/cxx/isce3/geometry/DEMInterpolator.h
• /home/runner/work/isce3/isce3/cxx/isce3/geometry/DEMInterpolator.cpp