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Mars Digital Image Map
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Mars Digital Image Map - Disc 1.iso
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dsmapdim.lbl
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1991-09-05
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OBJECT = DATA_SET_MAP_PROJECT_CATALOG
DATA_SET_ID = "VO1/VO2-M-VIS-5-DIM-V1.0"
OBJECT = DS_MAP_PROJECT_INFO_CATALOG
MAP_PROJECTION_TYPE = "SINUSOIDAL"
MAP_PROJECTION_DESC = "MDIM (Mars Digital Image Maps) are
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.
The center latitude for all MDIM's is the equator. Each MDIM file
contains its own central meridian.
The transformation from latitude and longitude to line and sample
is given by the following equations:
line = INT(X_AXIS_PROJECTION_OFFSET - lat*MAP_RESOLUTION + 1.0)
sample = INT(Y_AXIS_PROJECTION_OFFSET - (lon - CENTER_LONGITUDE)*
MAP_RESOLUTION*cos(lat) + 1.0)
Note that integral values of line and sample correspond to center
of a pixel. Lat and lon are the latitude and longitude of a given
spot on the surface.
X_AXIS_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 X_AXIS_PROJECTION_OFFSET is positive for images
starting north of the equator and is negative for images starting
south of the equator.
Y_AXIS_PROJECTION_OFFSET is the nearest sample number to the left
of the projection longitude. The value of Y_AXIS_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 the number of pixels per degree on the planet.
The values for MDIM products will be 256, 64, 16, and 4.
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
MAXIMUM_LONGITUDE and MINIMUM_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_PROJ_REF_INFO_CATALOG
REFERENCE_KEY_ID = "DAVIESETAL1989"
OBJECT = REFERENCE
DOCUMENT_TOPIC_TYPE = "ROTATIONAL ELEMENTS OF THE
PLANETS"
JOURNAL_NAME = "CELESTIAL MECHANICS AND DYNAMICAL
ASTRONOMY"
PUBLICATION_DATE = "1989"
REFERENCE_DESC = "Davies, M.E., V.K. Abalakin, M.
Bursa, G.E. Hunt, J.H. Lieske, B. Morando, R.H. Rapp, P.K.
Seidelmann, A.T. Sinclair, and Y.S. Tjuflin, Report of the
IAU/IAG/COSPAR working group on cartographic coordinates and
rotational elements of the planets and satellites: 1988, Celestial
Mechanics and Dynamical Astronomy, 46, 187-204, 1989."
OBJECT = REFERENCE_AUTHORS_CATALOG
AUTHOR_FULL_NAME = "MERTON E. DAVIES"
END_OBJECT = REFERENCE_AUTHORS_CATALOG
OBJECT = REFERENCE_AUTHORS_CATALOG
AUTHOR_FULL_NAME = "V. K. ABALAKIN"
END_OBJECT = REFERENCE_AUTHORS_CATALOG
OBJECT = REFERENCE_AUTHORS_CATALOG
AUTHOR_FULL_NAME = "M. BURSA"
END_OBJECT = REFERENCE_AUTHORS_CATALOG
OBJECT = REFERENCE_AUTHORS_CATALOG
AUTHOR_FULL_NAME = "G. E. HUNT"
END_OBJECT = REFERENCE_AUTHORS_CATALOG
OBJECT = REFERENCE_AUTHORS_CATALOG
AUTHOR_FULL_NAME = "J. H. LIESKE"
END_OBJECT = REFERENCE_AUTHORS_CATALOG
OBJECT = REFERENCE_AUTHORS_CATALOG
AUTHOR_FULL_NAME = "B. MORANDO"
END_OBJECT = REFERENCE_AUTHORS_CATALOG
OBJECT = REFERENCE_AUTHORS_CATALOG
AUTHOR_FULL_NAME = "R. H. RAPP"
END_OBJECT = REFERENCE_AUTHORS_CATALOG
OBJECT = REFERENCE_AUTHORS_CATALOG
AUTHOR_FULL_NAME = "P. K. SEIDELMANN"
END_OBJECT = REFERENCE_AUTHORS_CATALOG
OBJECT = REFERENCE_AUTHORS_CATALOG
AUTHOR_FULL_NAME = "A. T. SINCLAIR"
END_OBJECT = REFERENCE_AUTHORS_CATALOG
OBJECT = REFERENCE_AUTHORS_CATALOG
AUTHOR_FULL_NAME = "Y. S. TJUFLIN"
END_OBJECT = REFERENCE_AUTHORS_CATALOG
END_OBJECT = REFERENCE
END_OBJECT = DS_MAP_PROJ_REF_INFO_CATALOG
OBJECT = DS_MAP_PROJ_REF_INFO_CATALOG
REFERENCE_KEY_ID = "BATSON1987"
OBJECT = REFERENCE
DOCUMENT_TOPIC_TYPE = "DIGITAL CARTOGRAPHY"
JOURNAL_NAME = "PHOTOGRAMMETRIC ENGINEERING AND
REMOTE SENSING"
PUBLICATION_DATE = "1987"
REFERENCE_DESC = "Batson, R.M., Digital Cartography
of the Planets: New Methods, Its Status, and Its Future: September
1987, Photogrammetric Engineering and Remote Sensing, Vol. 53, No.
9, pp. 1211-1218."
OBJECT = REFERENCE_AUTHORS_CATALOG
AUTHOR_FULL_NAME = "RAYMOND M. BATSON"
END_OBJECT = REFERENCE_AUTHORS_CATALOG
END_OBJECT = REFERENCE
END_OBJECT = DS_MAP_PROJ_REF_INFO_CATALOG
OBJECT = DS_MAP_PROJ_REF_INFO_CATALOG
REFERENCE_KEY_ID = "EDWARDS1987"
OBJECT = REFERENCE
DOCUMENT_TOPIC_TYPE = "DIGITAL CARTOGRAPHY"
JOURNAL_NAME = "PHOTOGRAMETRIC ENGINEERING
REMOTE SENSING"
PUBLICATION_DATE = "1987"
REFERENCE_DESC = "Edwards, K., Geometric Processing
of Digital Images of the Planets: September, 1987, Photgrametric
Engineering and Remote Sensing, Vol. 53, No. 9, pp. 1219-1222."
OBJECT = REFERENCE_AUTHORS_CATALOG
AUTHOR_FULL_NAME = "KATHLEEN EDWARDS"
END_OBJECT = REFERENCE_AUTHORS_CATALOG
END_OBJECT = REFERENCE
END_OBJECT = DS_MAP_PROJ_REF_INFO_CATALOG
OBJECT = DS_MAP_PROJ_REF_INFO_CATALOG
OBJECT = REFERENCE
DOCUMENT_TOPIC_TYPE = "MAP PROJECTION"
JOURNAL_NAME = "N/A"
PUBLICATION_DATE = "1987"
REFERENCE_DESC = "Snyder, John P., Map projections
-- a working manual, U. S. Geol. Surv. Prof. Paper 1395, 383p.,
1987."
OBJECT = REFERENCE_AUTHORS_CATALOG
AUTHOR_FULL_NAME = "JOHN P. SNYDER"
END_OBJECT = REFERENCE_AUTHORS_CATALOG
END_OBJECT = REFERENCE
END_OBJECT = DS_MAP_PROJ_REF_INFO_CATALOG
END_OBJECT = DS_MAP_PROJECT_INFO_CATALOG
END_OBJECT = DATA_SET_MAP_PROJECT_CATALOG
END