Enceladus Cassini Global Mosaic 100m Schenk

Primary Authors

Schenk, Paul M., McKinnon, William B.

Originators

Lunar and Planetary Institute/USRA

Publisher

Planetary Data System

Publication Date

2024-08-12

Abstract

This new global rectified base mosaic of Enceladus (Schenk and McKinnon, 2024) is deriverd from more than 500 Cassini ISS images acquired in the clear filter with resolutions from 250 to <50 meters pixel scale. The mosaic is based on an updated control network which properly aligns the images with the best possible accuracy which was constructed to complete a concurrent and registered shape model and digital elevation model (or topographic map linked here). This global high-resolution image mosaic of Enceladus is at 100-m pixel scales. Here we performed the bundle adjustment by solving for both the location (in map coordinates) and radius of each control point, using the updated triaxial shape of Thomas et al. (2016) as a starting reference (a = 256.2 ± 0.3, b = 251.4 ± 0.2, c = 248.6 ± 0.2 km, where the uncertainties are 2σ). We also use the final 2020 Cassini trajectory kernels from NAIF, including spacecraft position and planetary definition kernels. Our derived maps are shown as elevations relative to this ellipsoidal reference shape. The control points are well-distributed in latitude and longitude including those derived from north polar images taken during the November 2016 non-targeted but close flyby of Enceladus during Cassini Rev. 250. Cite: Schenk, Paul. M., McKinnon, William, B., 2024, New global topography of Enceladus: Hypsometry, basins, spherical harmonics, shell thickness, and true polar wander revisited, Icarus, Volume 408, 15 January 2024, 115827, DOI: https://doi.org/10.1016/j.icarus.2023.115827. References: Schenk, P. Hamilton, D.P., Johnson, R.E., McKinnon, W.B., Paranicas, C., Schmidt, J., Showalter, M.R., 2011, Plasma, plumes and rings: Saturn system dynamics as recorded in global color patterns on its midsize icy satellites Icarus, 211, pp. 740-757, 10.1016/j.icarus.2010.08.016. Schenk, P.M., Beyer, R.A., McKinnon, W.B., Moore, J.M., Spencer, J.R., et al., 2018a, Basins, fractures and volcanoes: global cartography and topography of Pluto from new horizons, Icarus, 314, pp. 400-433, 10.1016/j.icarus.2018.06.008. Schenk, P.M., Beyer, R.A., McKinnon, W.B., Moore, J.M., Spencer, J.R., et al., 2018b, Breaking up is hard to do: global cartography and topography of Pluto’s mid-sized icy moon Charon from new horizons, Icarus, 315 (2018), pp. 124-145, 10.1016/j.icarus.2018.06.010. Thomas, P.C. Tajeddine, R., Tiscareno, M.S., Burns, J.A., Joseph, J., Loredo, T.J., Helfenstein, P., Porco, C., 2016, Enceladus’s measured physical libration requires a global subsurface ocean, Icarus, 264, pp. 37-47, 10.1016/j.icarus.2015.08.037

Purpose

Mosaic and DEM to help reveal that the shape of this active icy ocean world is distorted from a simple triaxial ellipsoid.

Contact and Distribution

Format

Archive, Control Network, Global Mosaic, Grey Scale, Image, Raster Data, Remote-sensing Data

Access Constraints

None

Access Scope

PDS

Use Constraints

Please cite authors

Supplemental Information

https://www.sciencedirect.com/science/article/pii/S0019103523004062#da0005

Native Data Set Environment

ESRI Arcinfo, ISIS v3

Astrogeology Theme

Cartography, Control Network, Geographic Information System (GIS), Geomorphology, Geophysical, Image Processing, Photogrammetry, Remote Sensing, Satellites

Mission Names

Cassini-Huygens

Instrument Names

ISS

Digital Product?

yes

Online Package Link

https://astrogeology.usgs.gov/search/map/enceladus-cassini-global-mosaic-100m-schenk

External File Size

495 MB

Online File Link

https://asc-astropedia.s3.us-west-2.amazonaws.com/Enceladus/Cassini/Enceladus_Cassini_mosaic_global_100m_schenk2024.tif

Access Instructions

None

Data Status and Quality

Time Period of Content (start)

1999-01-09

Time Period of Content (stop)

2000-10-01

Currentness Reference

Ground condition

Progress

Complete

Update Frequency

As needed

Logical Consistency

Horizontal post spacings (or footprints) of ~400 meters horizontal and vertical precisions of roughly 25-100 m depending on location.

Lineage

Process Date

2024-08-12

Source Name or Organization

Planetary Data System

Source Publication Date

2005-06-10

Source Title

Cassini Imaging Science Subsystem (ISS)

Source Online Linkage

{https://pds-imaging.jpl.nasa.gov/volumes/iss.html,https://pds-imaging.jpl.nasa.gov/portal/cassini_mission.html}

Source PDS Archive

Cassini

PDS Status

PDS 4 Compatible

Type of Source Media

Online

Horizontal Positional Accuracy Report

Accurate to Control Net

Vertical Positional Accuracy Report

Accurate to Control Net

Geospatial Information

Target

Enceladus

System

Saturn

Minimum Latitude

-90

Maximum Latitude

90

Minimum Longitude

0

Maximum Longitude

360

Direct Spatial Reference Method

Raster

Object Type

Pixel

Raster Row Count (lines)

8049

Raster Column Count (samples)

16098

Bit Type (8, 16, 32)

32

Radius A

256200.0

Radius C

256200.0

Control Net

this product is the control network

Bands

1

Pixel Resolution (meters/pixel)

100

Scale (pixels/degree)

44.715

Horizontal Coordinate System Units

Meters

Map Projection Name

Equirectangular

Latitude Type

Planetocentric

Longitude Direction

Positive East

Longitude Domain

0 to 360