Enceladus Cassini ISS Global Mosaic HPF 110m

Primary Authors

Michael T. Bland, Tammy L. Becker, Kenneth L. Edmunson, Thomas Roatsch, Brent A. Archinal, Driss Takir, G. Wes Patterson, Geoffrey Collins, Paul Schenk, Robert T. Pappalardo, Debbie A. Cook

Originators

Cassini Team, Jet Propulsion Laboratory, Space Science Institute, Applied Physics Laboratory

Publisher

USGS Astrogeology Science Center

Publication Date

2018-10-22

Abstract

Product Information: This mosaic represents the completion of a global control network of Enceladus containing Cassini Imaging Science Subsystem (ISS) images. A total of 586 images in CLR, GRN, UV3, and IR3 filters were selected for the control network. The image selection criteria were based on coverage, quality, and a spatial resolution between 50 and 500 meters per pixel (m) with phase angles less than 120 degrees. While this collection of images was enough for global coverage of Enceladus, the coverage in some filters, specifically UV3 and IR3, were inadequate (Bland, 2018). A high pass filter (HPF) has been applied to the images in order to achieve a uniform brightness (the low frequency albedo has been removed) and then converted to an 8bit data range. All images were map projected to the IAU mean radius (252.1 km/pixel). The map is an equidistant (simple cylindrical) projection and has a scale of 110 meters (360 feet) per pixel at the equator. The mean radius of Enceladus used for projection of this map is 252 kilometers (157 miles). Like other recent Enceladus global maps, this mosaic was shifted 3.5 degrees to the west to be consistent with the International Astronomical Union (IAU) longitude definition for Enceladus Ancillary Products (on the right), include north and south polar views of the controlled mosaic in GeoTIFF format with corresponding ISIS3 labels. The Ancillary Products also include a compressed archive containing raster backplanes of emission, incidence and phase angles, and original spatial resolution of the constituent images of the mosaic Mission and Instrument Information: The Cassini-Huygens mission was a joint endeavor between the Italian Space Agency, European Space Agency (ESA) and National Aeronautics and Space Administration (NASA). Cassini-Huygens launched from Cape Canaveral Air Force Base in Florida on October 15, 1997 and ended on September 15, 2017 when Cassini began its Final Entry into Saturn’s Atmosphere. The primary mission ran from July 2004 – June 2008, the first mission extension (Equinox) was from July 2008- October 2010 and was followed by a final extended mission (Solstice) from October 2010 – September 2017. During the Equinox extended mission, Cassini had seven encounters with Enceladus in October and November 2009. The imaging team consists of scientists from the US, England, France, and Germany. The imaging operations center and team lead (Dr. C. Porco) are based at the Space Science Institute in Boulder, Colorado, USA. The Cassini Imaging Science Subsystem (ISS) consists of two framing cameras. The narrow angle camera is a reflecting telescope with a focal length of 2000 mm and a field of view of 0.35 degrees. The wide-angle camera is a refractor with a focal length of 200 mm and a field of view of 3.5 degrees. The stated objective of the ISS is to obtain global coverage for all medium-sized icy satellites with a resolution better than 1 km/pixel and high-resolution images of selected areas (Porco, 2004). This goal was achieved with image sequences obtained during close flybys supplemented by images from greater distances to complete the coverage (Roatsch, 2016) References: Bland, M. T., Becker, T. L., Edmundson, K. L., Roatsch, T., Archinal, B. A., Takir, D., Patterson, G. W., et al. (2018). A new Enceladus global control network, image mosaic, and updated pointing kernels from Cassini's 13‐year mission. Earth and Space Science, 5(10), 604–621. https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2018EA000399 Roatsch, T., Kersten, E., Matz, K.-D., Scholten, F., & Porco, C. C. (2016). Cartography of the medium-sized saturnian satellites based on Cassini-ISS images. Paper presented at the Enceladus and the Icy Moons of Saturn Conference, Lunar and Planetary Institute, Boulder, CO. https://www.hou.usra.edu/meetings/enceladus2016/pdf/3032.pdf Porco C. C., West, R. A., Squyres, S., McEwan, A., Thomas, P., Murray, C. D., Delgenio, A., et al. (2004). Cassini Imaging Science: Instrument Characteristics and Anticipated Scientific Investigations at Saturn. In: Russell C. T. (Eds.), The Cassini-Huygens Mission. Dordrecht, Netherlands: Springer. https://doi.org/10.1007/1-4020-3874-7_6

Purpose

This effort was in support of a new global geologic map of Enceladus.

Contact and Distribution

Format

Global Mosaic, Remote-sensing Data

Access Scope

PDS

Supplemental Information

https://doi.org/10.1029/2018EA000399, http://www.ciclops.org/view/6197/Map_of_Enceladus_-_February_2010

Native Data Set Environment

ISIS v3

Astrogeology Theme

Geomorphology, Image Processing, Remote Sensing

Mission Names

Cassini-Huygens

Instrument Names

ISS

Online Package Link

https://astrogeology.usgs.gov/search/map/enceladus_cassini_iss_global_mosaic_hpf_110m

External File Size

120 MB

Online File Link

https://planetarymaps.usgs.gov/mosaic/Enceladus/Cassini/Enceladus_Cassini_ISS_Global_Mosaic_100m_HPF.tif

Contact Address

2255 N. Gemini Drive

Contact City

Flagstaff

Contact State

AZ

Contact Postal Code

86001

Contact Email

astroweb@usgs.gov

Data Status and Quality

Time Period of Content (start)

1969-12-31

Currentness Reference

Publication date

Progress

Complete

Lineage

Process Date

2018-03-30

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 Like

Attribute Accuracy Report

Accurate to Control Net

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

Grid Cell

Raster Row Count (lines)

7920

Raster Column Count (samples)

15840

Bit Type (8, 16, 32)

8

Quad Name

Radius A

252100

Radius C

252100

Bands

1

Pixel Resolution (meters/pixel)

100

Scale (pixels/degree)

43.999750442777

Map Projection Name

Equirectangular

Latitude Type

Planetocentric

Longitude Direction

Positive East

Longitude Domain

0 to 360