Maps of the Galilean Satellites

USGS Flagstaff maintains a  Planetary Nomenclature site, including naming conventions and feature lists.

This following link leads to a list of other sites for planetary maps, often cosmetically cleaner and better for 3-D renderings, etc.

Io

Galileo-Based Maps

Galileo Io Base Map, released June 1999, by the USGS. Available here in various resolutions, all JPEG compressed but with negligible loss of detail. Documentation, from Alfred McEwen.

0.25 degrees/pixel, 1440 x 720 pixels, 214 kbytes.
0.25 degrees/pixel, 1440 x 720 pixels, with lat/lon grid, 220 kbytes.
4 km/pixel, 2874 x 1437 pixels, 690 kbytes.
Original resolution, 2 km/pixel, 5748 x 2874 pixels, 2.0 Mbytes.

Io map with recent names, in PDF format, at the USGS Solar System Nomenclature site.

The above USGS map (April 1999 version), in JPEG form. 4911 x 2452 pixels, 1.4 Mbyte image.

Galileo image mosaic of Io, with lat/lon grid and names. Not photometric: good for positions only. From McEwen et al. 1998, Active volcanism on Io as seen by Galileo SSI, Icarus 135, 181-219. A press release on the Galileo Web site.

Voyager-Based Maps

These Voyager-based JPEG-format images have compression artifacts, though these are very minor. For full-fidelity versions of these images, in FITS format, go to the FTP site. Note: Some of these images are very large- consider downloading the smaller versions instead.

Voyager image mosaic of Io, using the latest Io control network (accurate to < 1 degree). Not photometric: good for positions only. Courtesy Alfred McEwen. 3600 x 1800 byte array with 0.1 x 0.1 degree pixels, x value goes from 179.95 to -179.95 degrees longitude, y value from 89.95 to -89.95 degrees in latitude.


Like iobase.jpg but 1800 x 900 with 0.2 x 0.2 degree pixels, from 179.9 to -179.9 in longitude, 89.9 to -89.9 in latitude.


Like iobase.jpg but 720 x 360 with 0.5 x 0.5 degree pixels, from 179.75 to -179.75 in longitude, 89.75 to -89.75 in latitude.


Documentation from Alfred McEwen describing the "iobase" mosaic, plus the above details about the JPEG versions of the mosaics.

Voyager image of Loki, FDS 16389.42, blue filter, reprojected to simple cylindrical projection and tied to same control net as the iobase mosaic. Courtesy Alfred McEwen. 848 x 976 byte array with 1/16 degree pixels, from 275 to 328 in longitude, -11 to +50 in latitude. No photometric corrections or filtering applied: I/F=DN*0.00294 assuming the narrow-angle blue correction factor is 1.000.


Voyager 2 global mosaics of Io, by Alfred McEwen, with improved photometric and geometric control. 1080 x 540 pixels. See documentation.

UV filter mosaic


Violet filter mosaic


Blue filter mosaic


Green filter mosaic


Orange filter mosaic


Color composite of the above violet, blue, and orange maps.


Global mosaic of Voyager hi-res and med-res images of Io, resampled to 16 pixels per degree or 1.99 km/pixel, size 5760 x 2880 pixels. From Tony Rosanova at USGS Flagstaff. Longitude range 360 - 0 degrees, latitude range 90 - -90 degrees.


Global mosaic of lo-res and med-res images of Io, 8 pixels per degree, Longitude range 180 - -180 degrees, latitude range -90 - 90 degrees. From Tony Rosanova, USGS Flagstaff


Previous image, resampled to 4 pixels per degree.


Previous image, resampled to 2 pixels per degree.


Europa

Galileo- and Voyager-based Europa map with recent names, in PDF format, at the USGS Solar System Nomenclature site.

Voyager global mosaic of Europa, 1440 x 720 pixels, 4 pixels per degree. Resampled version of higher resolution mosaic (eurmapbig.jpg) produced by Tammy Becker at USGS Flagstaff. Longitude range 360 - 0 degrees, latitude range -90 - +90 degrees.


Original-resolution version of eurmap.jpg, 4 km per pixel, 2453 x 1226 pixels.


Like eurmap.jpg, but resampled to 2 pixels per degree, 720 x 360 pixels.


Mosaic of "high resolution" Voyager 2 images of Europa, 2550 x 4361 pixels, 1 km/pixel, produced by Tammy Becker at USGS Flagstaff. Longitude range 230 - 135 degrees, latitude range -90 - +70 degrees. Original images had a 2 km/pixel resolution, so this mosaic oversamples the data.


Like eurhiresbig.jpg, but resampled to 2 km/pixel, close to the resolution of the original images. Size 1275 x 2181 pixels.


Ganymede

Galileo- and Voyager-based Ganymede map with recent names, in PDF format, at the USGS Solar System Nomenclature site.

Voyager global mosaic of Ganymede, 1440 x 720 pixels, 4 pixels per degree. Resampled version of higher resolution mosaic (ganmapbig.jpg) produced by Bob Sucharski at USGS Flagstaff. Longitude range 180 - -180 degrees, latitude range -90 - +90 degrees.


Original-resolution version of ganmap.jpg, 4 km per pixel, 4137 x 2069 pixels. Because the original Ganymede images have fairly low resolution, the smaller maps, ganmap.jpg and ganmapsmall.jpg, contain almost all the detail seen in this big map.


Like ganmap.jpg, but resampled to 2 pixels per degree, 720 x 360 pixels.


Callisto

Galileo- and Voyager-based Callisto map with recent names, in PDF format, at the USGS Solar System Nomenclature site.

Return to IJW Satellites Home Page