The spherical_geometry library is a Python package for handling spherical polygons that represent arbitrary regions of the sky.
Installation
On PyPI:
pip install spherical-geometry
On conda:
conda install -c conda-forge spherical-geometry
Requirements
Python 3.9 or later
Numpy 1.23 or later
astropy 5.0.4 or later
qd-library 2.3.7 or later (optional: if not available, the bundled version will be used). To force using the system-installed version, build with USE_SYSTEM_QD=1 pip install ..
Bundled qd-library
Origin: https://www.davidhbailey.com/dhbsoftware/qd-2.3.24.tar.gz
A custom libqd/include/qd/qd_config.h is provided to circumvent the need to run any configuration scripts. This generalized configuration may not be optimized for your system.
The spherical_geometry test suite fail when linked to a system-optimized qd library, because the tests are written for the general case.
Coordinate representation
Coordinates in world space are traditionally represented by right ascension and declination (ra and dec), or longitude and latitude. While these representations are convenient, they have discontinuities at the poles, making operations on them trickier at arbitrary locations on the sky sphere. Therefore, all internal operations of this library are done in 3D vector space, where coordinates are represented as (x, y, z) vectors. The spherical_geometry.vector module contains functions to convert between (ra, dec) and (x, y, z) representations.
While any (x, y, z) triple represents a vector and therefore a location on the sky sphere, a distinction must be made between normalized coordinates that fall exactly on the unit sphere, and unnormalized coordinates which do not. A normalized coordinate is defined as a vector whose length is 1, i.e.:
To prevent unnecessary recomputation, many methods in this library assume that the vectors passed in are already normalized. If this is not the case, spherical_geometry.vector.normalize_vector can be used to normalize an array of vectors.
When not working in Cartesian vectors, the library allows the user to work in either degrees or radians. All methods that require or return an angular value have a degrees keyword argument. When degrees is True, these measurements are in degrees, otherwise they are in radians.
Spherical polygons
Spherical polygons are arbitrary areas on the sky sphere enclosed by great circle arcs. They are represented by the ~spherical_geometry.polygon.SphericalPolygon class.
Representation
The points defining the polygon are available from the ~polygon.SphericalPolygon.points property. It is a Nx3 array where each row is an (x, y, z) vector, normalized. The polygon points are explicitly closed, i.e., the first and last points are the same.
Where is the inside?
The edges of a polygon serve to separate the “inside” from the “outside” area. On a traditional 2D planar surface, the “inside” is defined as the finite area and the “outside” is the infinite area. However, since the surface of a sphere is cyclical, i.e., it wraps around on itself, the a spherical polygon actually defines two finite areas. To specify which should be considered the “inside” vs. the “outside”, the definition of the polygon also has an “inside point” which is just any point that should be considered inside of the polygon.
In the following image, the inside point (marked with the red dot) declares that the area of the polygon is the green region, and not the white region.
The inside point of the the polygon can be obtained from the ~polygon.SphericalPolygon.inside property.
What is the orientation?
The correctness of several of the algorithms using polygons depends on a consistent orientation of the points defining it. That is, the points should have a clockwise order. When creating a new spherical polygon, the order of the points defining a polygon will be reversed if they are not in clockwise order. The method SphericalPolygon.is_clockwise is used to est if the points are in clockwise order. It takes two successive sides and computes the normal vector to the sides. If the normal vector points inward towards the center of the sphere, the two sides are counter clockwise. If the normal vector points outward, the two sides are clockwise. The code determines the orientation by computing the triple product of the two sides with the vertex of the the two sides. Summing the triple product over all the sides gives the predominant orientation of the points in the polygon.
Disjoint Polygons
If a polygon is the result of the intersection of polygons, it may be disjoint. Disjoint polygons are represented as a list of spherical polygons. The library handles the details of this internally. However, the user must be aware that several of the properties of polygons are generators and return the value for a single polygon at a time. To access all the values of a proeprty, either use a for loop, or coerce the property to a list. The properties which are generators are:
SphericalPolygon.points: The points defining each polygon
SphericalPolygon.inside : The inside point of each polygon
If the intersection of two polygons generates disjoint polygons the code computes a new interior point for the disjoint polygons.
Creating spherical polygons
SphericalPolygon objects have 5 different constructors:
SphericalPolygon: Takes an array of (x, y, z) points, or a list of disjoint SphericalPolygon instances.
SphericalPolygon.from_radec: Takes an array of (ra, dec) points and an inside point.
SphericalPolygon.from_cone: Creates a polygon from a cone on the sky shere. Takes (ra, dec, radius).
SphericalPolygon.from_wcs: Creates a polygon from the footprint of a FITS image using its WCS header keywords. Takes a FITS filename or a astropy.io.fits.Header object.
SphericalPolygon.convex_hull: Creates a polygon that is the convex hull of a list of points.
Operations on Spherical Polygons
Once one has a SphericalPolygon object, there are a number of operations available:
~SphericalPolygon.contains_point: Determines if the given point is inside the polygon.
~SphericalPolygon.intersects_poly: Determines if one polygon intersects with another.
~SphericalPolygon.area: Determine the area of a polygon.
~SphericalPolygon.union and ~SphericalPolygon.multi_union: Return a new polygon that is the union of two or more polygons.
~SphericalPolygon.intersection and ~SphericalPolygon.multi_intersection: Return a new polygon that is the intersection of two or more polygons.
~SphericalPolygon.overlap: Determine how much a given polygon overlaps another.
~SphericalPolygon.to_radec: Convert (x, y, z) points in the polygon to (ra, dec) points.
~SphericalPolygon.draw: Plots the polygon using matplotlib’s Basemap toolkit. This feature is rather bare and intended primarily for debugging purposes.
Great circle arcs
As seen above, great circle arcs are used to define the edges of the polygon. The spherical_geometry.great_circle_arc module contains a number of functions that are useful for dealing with them.
length: Returns the angular distance between two points on the sphere.
intersection: Returns the intersection point between two great circle arcs.
intersects: Determines if two great circle arcs intersect.
intersects_point: Determines if a point is along the great circle arc.
angle: Calculate the angle between two great circle arcs.
midpoint: Calculate the midpoint along a great circle arc.
Release files for spherical-geometry 1.4.0
For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.
Source distribution (sdist)
| File | Size | Uploaded | |
|---|---|---|---|
| spherical_geometry-1.4.0.tar.gz | 8.7 MB | Details |
Built distributions (wheels)
Total release size: 254.3 MB
Release files / spherical_geometry-1.4.0.tar.gz
| Download URL | spherical_geometry-1.4.0.tar.gz |
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| Size | 8.7 MB |
| Tags | Source |
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Release files / spherical_geometry-1.4.0-cp314-cp314t-win_amd64.whl
| Download URL | spherical_geometry-1.4.0-cp314-cp314t-win_amd64.whl |
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| Size | 7.7 MB |
| Tags | CPython 3.14 CPython 3.14 free-threading Windows x86-64 |
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| Download URL | spherical_geometry-1.4.0-cp314-cp314t-win32.whl |
|---|---|
| Size | 7.7 MB |
| Tags | CPython 3.14 CPython 3.14 free-threading Windows x86-32 |
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| Download URL | spherical_geometry-1.4.0-cp314-cp314t-musllinux_1_2_x86_64.whl |
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| Size | 9.6 MB |
| Tags | CPython 3.14 CPython 3.14 free-threading Linux musl 1.2+ x86-64 |
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| Download URL | spherical_geometry-1.4.0-cp314-cp314t-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl |
|---|---|
| Size | 8.6 MB |
| Tags | CPython 3.14 CPython 3.14 free-threading Linux glibc 2.24+ x86-64 Linux glibc 2.28+ x86-64 |
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| Download URL | spherical_geometry-1.4.0-cp314-cp314t-macosx_11_0_arm64.whl |
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| Size | 7.7 MB |
| Tags | CPython 3.14 CPython 3.14 free-threading macOS 11.0+ ARM64 |
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| Download URL | spherical_geometry-1.4.0-cp314-cp314t-macosx_10_15_x86_64.whl |
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| Size | 7.7 MB |
| Tags | CPython 3.14 CPython 3.14 free-threading macOS 10.15+ x86-64 |
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| Download URL | spherical_geometry-1.4.0-cp314-cp314-win_amd64.whl |
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| Size | 7.7 MB |
| Tags | CPython 3.14 Windows x86-64 |
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| Download URL | spherical_geometry-1.4.0-cp314-cp314-win32.whl |
|---|---|
| Size | 7.7 MB |
| Tags | CPython 3.14 Windows x86-32 |
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| Download URL | spherical_geometry-1.4.0-cp314-cp314-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl |
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| Download URL | spherical_geometry-1.4.0-cp313-cp313-win32.whl |
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| Size | 7.7 MB |
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| Size | 7.7 MB |
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No |
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twine/6.1.0 CPython/3.13.7
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Release files / spherical_geometry-1.4.0-cp312-cp312-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl
| Download URL | spherical_geometry-1.4.0-cp312-cp312-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl |
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| Size | 8.6 MB |
| Tags | CPython 3.12 Linux glibc 2.24+ x86-64 Linux glibc 2.28+ x86-64 |
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No |
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twine/6.1.0 CPython/3.13.7
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Release files / spherical_geometry-1.4.0-cp312-cp312-macosx_11_0_arm64.whl
| Download URL | spherical_geometry-1.4.0-cp312-cp312-macosx_11_0_arm64.whl |
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| Size | 7.7 MB |
| Tags | CPython 3.12 macOS 11.0+ ARM64 |
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No |
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twine/6.1.0 CPython/3.13.7
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Release files / spherical_geometry-1.4.0-cp312-cp312-macosx_10_13_x86_64.whl
| Download URL | spherical_geometry-1.4.0-cp312-cp312-macosx_10_13_x86_64.whl |
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| Size | 7.7 MB |
| Tags | CPython 3.12 macOS 10.13+ x86-64 |
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twine/6.1.0 CPython/3.13.7
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Release files / spherical_geometry-1.4.0-cp311-cp311-win_amd64.whl
| Download URL | spherical_geometry-1.4.0-cp311-cp311-win_amd64.whl |
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| Size | 7.7 MB |
| Tags | CPython 3.11 Windows x86-64 |
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No |
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twine/6.1.0 CPython/3.13.7
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Release files / spherical_geometry-1.4.0-cp311-cp311-win32.whl
| Download URL | spherical_geometry-1.4.0-cp311-cp311-win32.whl |
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| Size | 7.7 MB |
| Tags | CPython 3.11 Windows x86-32 |
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Release files / spherical_geometry-1.4.0-cp311-cp311-musllinux_1_2_x86_64.whl
| Download URL | spherical_geometry-1.4.0-cp311-cp311-musllinux_1_2_x86_64.whl |
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| Size | 9.6 MB |
| Tags | CPython 3.11 Linux musl 1.2+ x86-64 |
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No |
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twine/6.1.0 CPython/3.13.7
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Release files / spherical_geometry-1.4.0-cp311-cp311-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl
| Download URL | spherical_geometry-1.4.0-cp311-cp311-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl |
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| Size | 8.6 MB |
| Tags | CPython 3.11 Linux glibc 2.24+ x86-64 Linux glibc 2.28+ x86-64 |
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No |
| Uploaded via |
twine/6.1.0 CPython/3.13.7
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Release files / spherical_geometry-1.4.0-cp311-cp311-macosx_11_0_arm64.whl
| Download URL | spherical_geometry-1.4.0-cp311-cp311-macosx_11_0_arm64.whl |
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| Size | 7.7 MB |
| Tags | CPython 3.11 macOS 11.0+ ARM64 |
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No |
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twine/6.1.0 CPython/3.13.7
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Release files / spherical_geometry-1.4.0-cp311-cp311-macosx_10_9_x86_64.whl
| Download URL | spherical_geometry-1.4.0-cp311-cp311-macosx_10_9_x86_64.whl |
|---|---|
| Size | 7.7 MB |
| Tags | CPython 3.11 macOS 10.9+ x86-64 |
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Uploaded using Trusted Publishing? What is trusted publishing? |
No |
| Uploaded via |
twine/6.1.0 CPython/3.13.7
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