lsst.skymap.tractInfo.ExplicitTractInfo Class Reference

Inheritance diagram for lsst.skymap.tractInfo.ExplicitTractInfo:

Public Member Functions
	__init__ (self, id, tractBuilder, ctrCoord, radius, tractOverlap, wcs, innerBoxCorners=None)

Protected Member Functions
	_minimumBoundingBox (self, wcs)

Protected Attributes
	_radius
	_vertexCoordList

Detailed Description

Information for a tract specified explicitly.

A tract is placed at the explicitly defined coordinates, with the nominated
radius.  The tracts are square (i.e., the radius is really a half-size).

Parameters
----------
id : : `int`
    tract ID
tractBuilder : Subclass of `lsst.skymap.BaseTractBuilder`
    Object used to compute patch geometry.
ctrCoord : `lsst.geom.SpherePoint`
    ICRS sky coordinate of center of inner region of tract; also used as
    the CRVAL for the WCS.
radius : `lsst.geom.Angle`
    Radius of the tract.
tractOverlap : `lsst.geom.Angle`
    Minimum overlap between adjacent sky tracts; this defines the minimum
    distance the tract extends beyond the inner region in all directions.
wcs : `lsst.afw.image.SkyWcs`
    WCS for tract. The reference pixel will be shifted as required so that
    the lower left-hand pixel (index 0,0) has pixel position 0.0, 0.0.
innerBoxCorners : `list` [`lsst.sphgeom.LonLat`], optional
    If set then the ``inner_sky_region`` will be a `lsst.sphgeom.Box` with
    these corners as oppsed to a `lsst.sphgeom.ConvexPolygon` built from
    the ``vertex_list``.

Definition at line 431 of file tractInfo.py.

Constructor & Destructor Documentation

__init__()

lsst.skymap.tractInfo.ExplicitTractInfo.__init__	(		self,
			id,
			tractBuilder,
			ctrCoord,
			radius,
			tractOverlap,
			wcs,
			innerBoxCorners = None )

Reimplemented from lsst.skymap.tractInfo.TractInfo.

Definition at line 459 of file tractInfo.py.

    def __init__(self, id, tractBuilder, ctrCoord, radius, tractOverlap, wcs, innerBoxCorners=None):
        # We don't want TractInfo setting the bbox on the basis of vertices,
        # but on the radius.
        vertexList = []
        self._radius = radius
        super(ExplicitTractInfo, self).__init__(
            id,
            tractBuilder,
            ctrCoord,
            vertexList,
            tractOverlap,
            wcs,
            innerBoxCorners=innerBoxCorners,
        )
        # Shrink the box slightly to make sure the vertices are in the tract
        bboxD = geom.BoxD(self.getBBox())
        bboxD.grow(-0.001)
        finalWcs = self.getWcs()
        self._vertexCoordList = finalWcs.pixelToSky(bboxD.getCorners())
 

Member Function Documentation

_minimumBoundingBox()

lsst.skymap.tractInfo.ExplicitTractInfo._minimumBoundingBox ( self, wcs )

protected

Calculate the minimum bounding box for the tract, given the WCS, and
the nominated radius.

Reimplemented from lsst.skymap.tractInfo.TractInfo.

Definition at line 479 of file tractInfo.py.

    def _minimumBoundingBox(self, wcs):
        """Calculate the minimum bounding box for the tract, given the WCS, and
        the nominated radius.
        """
        bbox = geom.Box2D()
        for i in range(4):
            cornerCoord = self._ctrCoord.offset(i*90*geom.degrees, self._radius + self._tractOverlap)
            pixPos = wcs.skyToPixel(cornerCoord)
            bbox.include(pixPos)
        return bbox

Member Data Documentation

_radius

lsst.skymap.tractInfo.ExplicitTractInfo._radius

protected

Definition at line 463 of file tractInfo.py.

_vertexCoordList

lsst.skymap.tractInfo.ExplicitTractInfo._vertexCoordList

protected

Definition at line 477 of file tractInfo.py.

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The documentation for this class was generated from the following file:

• /j/snowflake/release/lsstsw/stack/lsst-scipipe-9.0.0/Linux64/skymap/g80478fca09+4ce5a07937/python/lsst/skymap/tractInfo.py