Callisto Galileo/Voyager Global Mosaic 1km

Originators

USGS Astrogeology Science Center

Publisher

USGS Astrogeology Science Center

Abstract

This global map of Callisto utilizes the best image quality and moderate resolution coverage supplied by Galileo SSI (Solid State Imaging instrument) and Voyager 1 and 2. This mosaic was prepared using the ISIS 2 image processing and cartographic system and later converted to an ISIS 3 cube. The image data was selected on the basis of overall image quality, reasonable input resolution, and availability of moderate viewing and sun angles for topography. The average input resolution was 1.0 kilometers/pixel. The resolution ranged from 60 km/pixel for gap fill up to 400 meters/pixel.

Purpose

To build a global mosaic using the best available image data

Contact and Distribution

Format

Global Mosaic, Image, Raster Data, Remote-sensing Data

Access Constraints

public domain

Access Scope

Astropedia

Use Constraints

None

Edition

1

Supplemental Information

http://geopubs.wr.usgs.gov/i-map/i2770/

Native Data Set Environment

ISIS v3

Astrogeology Theme

Geomorphology, Remote Sensing, Satellites

Mission Names

Galileo, Voyager

Instrument Names

SSI

Online Package Link

https://astrogeology.usgs.gov/search/map/callisto_galileo_voyager_global_mosaic_1km

External File Size

110 MB

Online File Link

https://planetarymaps.usgs.gov/mosaic/Callisto_Voyager_GalileoSSI_global_mosaic_1km.tif

Contact Address

2255 N. Gemini Drive

Contact City

Flagstaff

Contact State

AZ

Contact Postal Code

86001

Contact Email

astroweb@usgs.gov

Progress

Complete

Update Frequency

As needed

Logical Consistency

The geometric control network was computed at the RAND Corporation using RAND’s most recent solution as of April 1999 (Davies and Katayama, 1981). This process involved selecting control points on the individual images, making pixel measurements of their locations, using reseau locations to correct for geometric distortions, and converting the measurements to millimeters in the focal plane. These data are combined with the camera focal lengths and navigation solutions as input to photogrammetric triangulation software that solves for the best-fit sphere, the coordinates of the control points, the three orientation angles of the camera at each exposure (right ascension, declination, and twist), and an angle (W0) which defines the orientation of Callisto in space. W0—in this solution 259.51°—is the angle along the equator to the east, between the 0° meridian and the equator’s intersection with the celestial equator at the standard epoch J2000.0. This solution places the crater Saga at its defined longitude of 326° west (Seidelmann and others, 2002). * Davies, M.E., and Katayama, F.Y., 1981, Coordinates of features on the Galilean satellites: Journal of Geophysical Research, v. 86, no. A10, p. 8635–8657. * Seidelmann, P.K., Abalakin, V.K., Bursa, M., Davies, M.E., de Bergh, C., Lieske, J.H., Oberst, J., Simon, J.L., Standish, E.M., Stooke, P., and Thomas, P.C., 2002, Report of the IAU/IAG Working Group on Cartographic and Rotational Elements of the Planets and Satellites—2000: Celestial Mechanics and Dynamical Astronomy, v. 82, p. 83–110.

Completeness Report

The average input resolution was 1.0 kilometers/pixel. The resolution ranged from 60 km/pixel for gap fill up to 400 meters/pixel.

Process Description

This global map base uses the best image quality and moderate resolution coverage supplied by Galileo SSI and Voyager 1 and 2 (Batson, 1987; Becker and others, 1998; Becker and others, 1999; Becker and others, 2001). The digital map was produced using Integrated Software for Imagers and Spectrometers (ISIS) (Eliason, 1997; Gaddis and others, 1997). The individual images were radiometrically calibrated and photometrically normalized using a Lunar-Lambert function with empirically derived values (McEwen, 1991; Kirk and others, 2000). A linear correction based on the statistics of all overlapping areas was then applied to minimize image brightness variations. The image data were selected on the basis of overall image quality, reasonable original input resolution (from 20 km/pixel for gap fill to as much as 150 m/pixel), and availability of moderate emission/incidence angles for topography. Although consistency was achieved where possible, different filters were included for global image coverage as necessary: clear for Voyager 1 and 2; clear and green (559 nm) for Galileo SSI. Individual images were projected to a Sinusoidal Equal-Area projection at an image resolution of 1.0 kilometer/pixel. The final constructed Sinusoidal projection mosaic was then reprojected to the Mercator and Polar Stereographic projections included on this sheet. The final mosaic was enhanced using commercial software. * Batson, R.M., 1987, Digital cartography of the planets—New methods, its status, and its future: Photogrammetric Engineering and Remote Sensing, v. 53, no. 9, p. 1211–1218. * Gaddis, L.R., Anderson, J., Becker, K.J., Becker, T.L., Cook, D., Edwards, K., Eliason, E.M., Hare, T., Kieffer, H.H., Lee, E.M., Mathews, J., Soderblom, L.A., Sucharski, T., Torson, J., McEwen, A.S., Robinson, M.S., 1997, An overview of the Integrated Software for Imaging Spectrometers (ISIS), in Lunar and Planetary Science Conference XXVIII: Houston, Lunar and Planetary Institute, p. 387. * McEwen, A.S., 1991, Photometric functions for photoclinometry and other applications: Icarus, v. 92, p. 298–311. * Kirk, R.L., Thompson, K.T., Becker, T.L., and Lee, E.M., 2000, Photometric modeling for plane-tary cartography, in Lunar and Planetary Science Conference XXXI: Houston, Lunar and Planetary Institute, abs. no. 2025 [CD-ROM].

Geospatial Information

Target

Callisto

System

Jupiter

Minimum Latitude

-90

Maximum Latitude

90

Minimum Longitude

0

Maximum Longitude

360

Direct Spatial Reference Method

Raster

Object Type

Grid Cell

Raster Row Count (lines)

7569

Raster Column Count (samples)

15138

Bit Type (8, 16, 32)

8

Quad Name

Radius A

2409300.0488

Radius C

2409300.0488

Bands

1

Pixel Resolution (meters/pixel)

1000.0051966711

Scale (pixels/degree)

42.05

Map Projection Name

Simple Cylindrical

Latitude Type

Planetocentric

Longitude Direction

Positive West

Longitude Domain

0 to 360