OBJECT = DATA_SET_MAP_PROJECT_CATALOG DATA_SET_ID = "VO1/VO2-M-VIS-5-DIM-V2.0" 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: NOTE: Version 2 author addition: The following equations do no Apply to the Version 2 release of the MDIM. Please see ERRATA.TXT file in the CD root directory for updated equations and discussion. line = INT(X_AXIS_PROJECTION_OFFSET - lat*MAP_RESOLUTION) sample = INT(Y_AXIS_PROJECTION_OFFSET - (lon - CENTER_LONGITUDE)* MAP_RESOLUTION*cos(lat)) 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 = "The rotational elements that enter into the production of a spacecraft image mosaic are the right ascension and declination of the planetary spin axis, precession and possibly nutation rates affecting the spin pole, rotation rate W', and rotational phase at epoch W0. Rotational elements for this mosaic, apart from W0, were adopted from FOLKNERETAL1997. The W0 parameter must be adjusted, based on a photogrammetrically computed control net solution that contains one or more landers whose inertial and image coordinates are both known, to place the small crater Airy-0 at zero longitude as required by definition of the International Astronomical Union. This mosaic was based on an unpublished control net solution carried out by M. E. Davies and T. Colvin of RAND in November, 1999, which resulted in the value W0=176.7215 degrees. The numbers of images, points, and measurements in this unpublished control calculation are similar to those for the calculation reported in DAVIESETAL1999, which resulted in a slightly different value of W0. These W0 values differ significantly from past solutions because the site identified for the Viking 1 lander has been shown to be substantially in error. The new solutions are tied to an identification of the Mars Pathfinder landing site. As of this writing, the International Astronomical Union has not formally accepted rotational parameters for Mars based on Mars Pathfinder." OBJECT = DS_MAP_PROJ_REF_INFO_CATALOG REFERENCE_KEY_ID = "DAVIESETAL1999" OBJECT = REFERENCE DOCUMENT_TOPIC_TYPE = "PLANETARY GEODESY" JOURNAL_NAME = "EOS TRANSACTIONS OF THE AMERICAN GEOPHYSICAL UNION" PUBLICATION_DATE = "1999" REFERENCE_DESC = " Davies, M. E., T. Colvin, R. Kirk, E. Lee, R. Sucharski, and T. Duxbury, 1999. The RAND USGS control network of Mars and the martian prime meridian. Eos Trans. AGU (suppl.), 80, p. F615." OBJECT = REFERENCE_AUTHORS_CATALOG AUTHOR_FULL_NAME = "MERTON E. DAVIES" END_OBJECT = REFERENCE_AUTHORS_CATALOG OBJECT = REFERENCE_AUTHORS_CATALOG AUTHOR_FULL_NAME = "TIMOTHY COLVIN" END_OBJECT = REFERENCE_AUTHORS_CATALOG OBJECT = REFERENCE_AUTHORS_CATALOG AUTHOR_FULL_NAME = "RANDOLPH L. KIRK" END_OBJECT = REFERENCE_AUTHORS_CATALOG OBJECT = REFERENCE_AUTHORS_CATALOG AUTHOR_FULL_NAME = "ELLA M. LEE" END_OBJECT = REFERENCE_AUTHORS_CATALOG OBJECT = REFERENCE_AUTHORS_CATALOG AUTHOR_FULL_NAME = "ROBERT M. SUCHARSKI" END_OBJECT = REFERENCE_AUTHORS_CATALOG OBJECT = REFERENCE_AUTHORS_CATALOG AUTHOR_FULL_NAME = "THOMAS C. DUXBURY" 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 = "FOLKNERETAL1997" OBJECT = REFERENCE DOCUMENT_TOPIC_TYPE = "PLANETARY GEODESY" JOURNAL_NAME = "SCIENCE" PUBLICATION_DATE = "1997" REFERENCE_DESC = " Folkner, W. M., C. F. Yoder, D. N. Yuan, E. M. Standish, R. A. Preston, 1997. Interior structure And seasonal mass redistribution of Mars from radio tracking of Mars Pathfinder. Science, 278, p. 1749-1752." OBJECT = REFERENCE_AUTHORS_CATALOG AUTHOR_FULL_NAME = "WILLIAM M. FOLKNER" END_OBJECT = REFERENCE_AUTHORS_CATALOG OBJECT = REFERENCE_AUTHORS_CATALOG AUTHOR_FULL_NAME = "CHARLES F. YODER" END_OBJECT = REFERENCE_AUTHORS_CATALOG OBJECT = REFERENCE_AUTHORS_CATALOG AUTHOR_FULL_NAME = "DAH-NING YUAN" END_OBJECT = REFERENCE_AUTHORS_CATALOG OBJECT = REFERENCE_AUTHORS_CATALOG AUTHOR_FULL_NAME = "E. MYLES STANDISH" END_OBJECT = REFERENCE_AUTHORS_CATALOG OBJECT = REFERENCE_AUTHORS_CATALOG AUTHOR_FULL_NAME = "ROBERT A. PRESTON" 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 REFERENCE_KEY_ID = "SNYDER1987" 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