lsst.skymap.patchInfo Namespace Reference

Classes
class	PatchInfo

Functions
def	makeSkyPolygonFromBBox (bbox, wcs)

Function Documentation

makeSkyPolygonFromBBox()

def lsst.skymap.patchInfo.makeSkyPolygonFromBBox	(		bbox,
			wcs
	)

Make an on-sky polygon from a bbox and a SkyWcs

Parameters
----------
bbox : `lsst.geom.Box2I` or `lsst.geom.Box2D`
    Bounding box of region, in pixel coordinates
wcs : `lsst.afw.geom.SkyWcs`
    Celestial WCS

Returns
-------
polygon : `lsst.sphgeom.ConvexPolygon`
    On-sky region

Definition at line 29 of file patchInfo.py.

def makeSkyPolygonFromBBox(bbox, wcs):
    """Make an on-sky polygon from a bbox and a SkyWcs
 
    Parameters
    ----------
    bbox : `lsst.geom.Box2I` or `lsst.geom.Box2D`
        Bounding box of region, in pixel coordinates
    wcs : `lsst.afw.geom.SkyWcs`
        Celestial WCS
 
    Returns
    -------
    polygon : `lsst.sphgeom.ConvexPolygon`
        On-sky region
    """
    pixelPoints = Box2D(bbox).getCorners()
    skyPoints = wcs.pixelToSky(pixelPoints)
    return ConvexPolygon.convexHull([sp.getVector() for sp in skyPoints])