`query_disc` (nside, vec, radius[, inclusive, …]) |
Returns pixels whose centers lie within the disk defined by *vec* and *radius* (in radians) (if *inclusive* is False), or which overlap with this disk (if *inclusive* is True). |

`query_polygon` (nside, vertices[, inclusive, …]) |
Returns the pixels whose centers lie within the convex polygon defined by the *vertices* array (if *inclusive* is False), or which overlap with this polygon (if *inclusive* is True). |

`query_strip` (nside, theta1, theta2[, …]) |
Returns pixels whose centers lie within the colatitude range defined by *theta1* and *theta2* (if inclusive is False), or which overlap with this region (if *inclusive* is True). |

`boundaries` (nside, pix[, step, nest]) |
Returns an array containing vectors to the boundary of the nominated pixel. |