diff options
author | V3n3RiX <venerix@redcorelinux.org> | 2017-10-09 18:53:29 +0100 |
---|---|---|
committer | V3n3RiX <venerix@redcorelinux.org> | 2017-10-09 18:53:29 +0100 |
commit | 4f2d7949f03e1c198bc888f2d05f421d35c57e21 (patch) | |
tree | ba5f07bf3f9d22d82e54a462313f5d244036c768 /dev-python/pymoc/metadata.xml |
reinit the tree, so we can have metadata
Diffstat (limited to 'dev-python/pymoc/metadata.xml')
-rw-r--r-- | dev-python/pymoc/metadata.xml | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/dev-python/pymoc/metadata.xml b/dev-python/pymoc/metadata.xml new file mode 100644 index 000000000000..0539850fc0b0 --- /dev/null +++ b/dev-python/pymoc/metadata.xml @@ -0,0 +1,32 @@ +<?xml version="1.0" encoding="UTF-8"?> +<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd"> +<pkgmetadata> + <maintainer type="project"> + <email>sci-astronomy@gentoo.org</email> + <name>Gentoo Astronomy Project</name> + </maintainer> + <longdescription lang="en"> + Frequently astronomical survey catalogues or images are sparse and + cover only a small part of the sky. In a Multi-Order Coverage map + the extent of data in a particular dataset is cached as a + pre-calculated mask image. The hierarchical nature enables fast + boolean operations in image space, without needing to perform complex + geometrical calculations. Services such as VizieR generally offer the + MOC masks, allowing a faster experience in graphical applications + such as Aladin, or for researchers quickly needing to locate which + datasets may contain overlapping coverage. + + The MOC mask image itself is tessellated and stored in NASA HealPix + format, encoded inside a FITS image container. Using the HealPix + (Hierarchical Equal Area isoLatitude Pixelization) tessellation + method ensures that more precision (pixels) in the mask are available + when describing complex shapes such as approximating survey or + polygon edges, while only needing to store a single big cell/pixel + when an coverage is either completely inside, or outside of the mask. + Catalogues can be rendered on the mask as circles. + </longdescription> + <upstream> + <remote-id type="pypi">pymoc</remote-id> + <remote-id type="github">grahambell/pymoc</remote-id> + </upstream> +</pkgmetadata> |