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