PDS_VERSION_ID = PDS3
RECORD_TYPE = STREAM
SPACECRAFT_NAME = "CLEMENTINE 1"
TARGET_NAME = "MOON"
OBJECT = DATA_SET_MAP_PROJECTION
DATA_SET_ID = "CLEM1-L-U-5-DIM-BASEMAP-V1.0"
OBJECT = DATA_SET_MAP_PROJECTION_INFO
MAP_PROJECTION_TYPE = "SINUSOIDAL"
MAP_PROJECTION_DESC = "The Clementine Basemap Mosaic
is presented in a Sinusoidal Equal-Area map projection. In
this projection, parallels of latitude are straight lines,
with constant distances between equal latitude intervals.
Lines of constant longitude on either side of the projection
meridian are curved since longitude intervals decrease with
the cosine of latitude to account for their convergence toward
the poles. This projection offers a number of advantages for
storing and managing global digital data; in particular, it is
computationally simple, and data are stored in a compact form.
The Sinusoidal Equal-Area projection is characterized by a
projection longitude, which is the center meridian of the
projection, and a scale, which is given in units of pixels/
degree. A projection longitude is defined for each Clementine
Basemap quadrangle
The transformation from latitude and longitude to line and
sample is given by the following equations:
line = INT(LINE_PROJECTION_OFFSET - lat*MAP_RESOLUTION)
sample = INT(SAMPLE_PROJECTION_OFFSET + (lon -
CENTER_LONGITUDE)*MAP_RESOLUTION*cos(lat))
Note that integral values of line and sample correspond to the
center of a pixel. Lat and lon are the latitude and longitude
of a given spot on the surface.
LINE_PROJECTION_OFFSET is the line number minus one on which
the map projection origin occurs. The map projection origin
is the intersection of the equator and the projection
longitude. The value of LINE_PROJECTION_OFFSET is positive for
images starting north of the equator and is negative for images
starting south of the equator.
SAMPLE_PROJECTION_OFFSET is the nearest sample number to the
left of the projection longitude. The value of SAMPLE_
PROJECTION_OFFSET is positive for images starting to the west
of the projection longitude and is negative for images starting
to the east of the projection longitude.
CENTER_LONGITUDE is the value of the projection longitude,
which is the longitude that passes through the center of the
projection.
MAP_RESOLUTION is measured in pixels/degree.
There are four PDS parameters that specify the latitude and
longitude boundaries of an image. MAXIMUM_LATITUDE and
MINIMUM_LATITUDE specify the latitude boundaries of the image,
and EASTERNMOST_LONGITUDE and WESTERNMOST_LONGITUDE specify the
longitudinal boundaries of the map.
Definitions of other mapping parameters can be found in the
PDS Data dictionary. "
ROTATIONAL_ELEMENT_DESC = "See DAVIESETAL1989."
OBJECT = DS_MAP_PROJECTION_REF_INFO
REFERENCE_KEY_ID = "DAVIESETAL1989"
END_OBJECT = DS_MAP_PROJECTION_REF_INFO
OBJECT = DS_MAP_PROJECTION_REF_INFO
REFERENCE_KEY_ID = "BATSON1987"
END_OBJECT = DS_MAP_PROJECTION_REF_INFO
OBJECT = DS_MAP_PROJECTION_REF_INFO
REFERENCE_KEY_ID = "EDWARDS1987"
END_OBJECT = DS_MAP_PROJECTION_REF_INFO
OBJECT = DS_MAP_PROJECTION_REF_INFO
REFERENCE_KEY_ID = "SNYDER1987"
END_OBJECT = DS_MAP_PROJECTION_REF_INFO
END_OBJECT = DATA_SET_MAP_PROJECTION_INFO
END_OBJECT = DATA_SET_MAP_PROJECTION
END