earth_curvature.h File Reference

Earth curvature correction for simple instruments (eg, AVHRR) More...

#include "image.h"

Go to the source code of this file.

Functions
Image	satdump::image::earth_curvature::correct_earth_curvature (Image &image, float satellite_height, float swath, float resolution_km, std::vector< float > *foward_table=nullptr, std::vector< float > *reverse_table=nullptr)
	This allows correcting the effect of the earth's curvature and instrument scanning methods to generate an image with a more linear relation between pixels and the Earth's surface distances. It is meant to correct images from nadir-pointing instruments scanning on the roll axis at a constant angle between pixels.
image::Image	satdump::image::earth_curvature::perform_geometric_correction (image::Image img, bool &success, std::vector< float > *foward_table=nullptr, std::vector< float > *reverse_table=nullptr)
	The same as correct_earth_curvature, but automatically reading the correction's configuration in the image metadata.

Detailed Description

Earth curvature correction for simple instruments (eg, AVHRR)

Function Documentation

correct_earth_curvature()

Image satdump::image::earth_curvature::correct_earth_curvature	(	Image &	image,
		float	satellite_height,
		float	swath,
		float	resolution_km,
		std::vector< float > *	foward_table = nullptr,
		std::vector< float > *	reverse_table = nullptr )

This allows correcting the effect of the earth's curvature and instrument scanning methods to generate an image with a more linear relation between pixels and the Earth's surface distances. It is meant to correct images from nadir-pointing instruments scanning on the roll axis at a constant angle between pixels.

Parameters

image	input image
satellite_height	satellite orbit height (in km)
swath	instrument swath in km
resolution_km	instrument ground resolution in km
foward_table	optional LUT generated. Input => Corrected
reverse_table	optional LUT generated. Corrected => Input

Returns

corrected image

perform_geometric_correction()

Image satdump::image::earth_curvature::perform_geometric_correction	(	image::Image	img,
		bool &	success,
		std::vector< float > *	foward_table = nullptr,
		std::vector< float > *	reverse_table = nullptr )

The same as correct_earth_curvature, but automatically reading the correction's configuration in the image metadata.

Parameters

img	input image
success	will be set to true on success
foward_table	optional LUT generated. Input => Corrected
reverse_table	optional LUT generated. Corrected => Input

Returns

corrected image