Source code for irfpy.moon.moon_map

"""
"""
from pkg_resources import resource_filename as _resource_filename
import imageio as _imageio

import numpy as _np


from irfpy.util import gridsphere as _gs


class MoonMapSmall:
    """ A class for a lunar map. Small version (1024x512 pix).

    >>> moonmap = MoonMapSmall()
    >>> filename = moonmap.filename
    >>> import os
    >>> print(os.path.basename(filename))
    Moon_LRO_LROC-WAC_Mosaic_global_1024.jpg
    """
    def __init__(self):
        self.filename = _resource_filename(__name__,
                                           'map/Moon_LRO_LROC-WAC_Mosaic_global_1024.jpg')

        self.image = _imageio.imread(self.filename)
        """Imageio image instance. (Extended from ``numpy`` array)
        """

        self._gridsphere = None

    def gridsphere(self):
        ny, nx, depth = self.image.shape

        if self._gridsphere is None:
            self._gridsphere = _gs.SimpleGridSphere(nlon=nx, nlat=ny)

            lonarr, latarr = self._gridsphere.get_cgrid()

            lonarr = lonarr.flatten()
            latarr = latarr[::-1].flatten()
            img = self.image[:, :, 0].flatten()

            self._gridsphere.append_values_lonlat(lonarr + 180, latarr, img)


        return self._gridsphere