Data classes

Detailed Description

Classes to represent the data stored in a Fits file.

Introduction

Data classes represent the data which can be read or written in a Fits file. They are split into header, image, and binary table data classes.

As a spoiler, here is a simplified class diagram:

Header data classes

Record is a very basic template structure which holds the following four fields:

• keyword,
• value,
• unit,
• comment.

Its template parameter is the type of the value.

See also

Header data classes

Image data classes

Rasters are the in-memory representation of the n-D arrays of Fits. A raster has:

• a dimension (number of axes) as a template parameter,
• a value type as a template parameter,
• a shape (of type Position, which is just an alias of std::array or std::vector),
• some data, i.e. the pixel values, stored contiguously, for example in a std::vector.

See also

Image data classes

Binary table data classes

Columns represent the contents of the data unit of binary table HDUs. They are made of two components:

• metadata as a ColumnInfo instance,
• data as a whatever-you-want!

In order to accommodate whatever-you-want kind of data container, Column is an abstract class whose only assumption is that elements are contiguous in memory, so that you just need to provide a raw pointer to the first element of the column.

See also

Binary table data classes

Modules
	Header data classes
	Classes to manipulate the data stored header units.
	Image data classes
	Image data containers and tools.
	Binary table data classes
	Binary table data containers and tools.

Classes
struct	Euclid::Fits::Named< T >
	A name and type. More...
struct	Euclid::Fits::Indexed< T >
	An index and type. More...