Maps

class gammapy.maps.Maps(**kwargs)

Bases: collections.abc.MutableMapping

A Dictionary containing Map objects sharing the same geometry.

This class simplifies handling and I/O of maps collections.

For maps with different geometries, use a regular dict.

Attributes Summary

geom	Map geometry (Geom)

Methods Summary

clear()
from_geom(geom, names[, kwargs_list])	Create map dictionary from geometry.
from_hdulist(hdulist[, hdu_bands])	Create map dictionary from list of HDUs.
get(k[,d])
items()
keys()
pop(k[,d])	If key is not found, d is returned if given, otherwise KeyError is raised.
popitem()	as a 2-tuple; but raise KeyError if D is empty.
read(filename)	Read map dictionary from file.
setdefault(k[,d])
to_hdulist([hdu_bands])	Convert map dictionary to list of HDUs.
update([E, ]**F)	If E present and has a .keys() method, does: for k in E: D[k] = E[k] If E present and lacks .keys() method, does: for (k, v) in E: D[k] = v In either case, this is followed by: for k, v in F.items(): D[k] = v
values()
write(filename[, overwrite])	Write map dictionary to file.

Attributes Documentation

geom

Map geometry (Geom)

Methods Documentation

clear() → None. Remove all items from D.

classmethod from_geom(geom, names, kwargs_list=None)

Create map dictionary from geometry.

Parameters

geomGeom

the input geometry that will be used by all maps

nameslist of str

the list of all map names

kwargs_listlist of dict

the list of arguments to be passed to from_geom()

Returns

mapsMaps

Maps object.

classmethod from_hdulist(hdulist, hdu_bands='BANDS')

Create map dictionary from list of HDUs.

Because FITS keywords are case insensitive, all key names will return as lower-case.

Parameters

hdulistHDUList

List of HDUs.

hdu_bandsstr

Name of the HDU with the BANDS table. Default is ‘BANDS’ If set to None, each map should have its own hdu_band

Returns

mapsMaps

Maps object.

get(k[, d]) → D[k] if k in D, else d. d defaults to None.

items() → a set-like object providing a view on D's items

keys() → a set-like object providing a view on D's keys

pop(k[, d]) → v, remove specified key and return the corresponding value.

If key is not found, d is returned if given, otherwise KeyError is raised.

popitem() → (k, v), remove and return some (key, value) pair

as a 2-tuple; but raise KeyError if D is empty.

classmethod read(filename)

Read map dictionary from file.

Because FITS keywords are case insensitive, all key names will return as lower-case.

Parameters

filenamestr

Filename to read from.

Returns

mapsMaps

Maps object.

setdefault(k[, d]) → D.get(k,d), also set D[k]=d if k not in D

to_hdulist(hdu_bands='BANDS')

Convert map dictionary to list of HDUs.

Parameters

hdu_bandsstr

Name of the HDU with the BANDS table. Default is ‘BANDS’ If set to None, each map will have its own hdu_band

Returns

hdulistHDUList

Map dataset list of HDUs.

update([E, ]**F) → None. Update D from mapping/iterable E and F.

If E present and has a .keys() method, does: for k in E: D[k] = E[k] If E present and lacks .keys() method, does: for (k, v) in E: D[k] = v In either case, this is followed by: for k, v in F.items(): D[k] = v

values() → an object providing a view on D's values

write(filename, overwrite=False)

Write map dictionary to file.

Parameters

filenamestr

Filename to write to.

overwritebool

Overwrite file if it exists.