Venus GIS Geologic Map of the Alpha Regio Quadrangle (V-32), 1:2.5M, 2019
We present a GIS package for the 1:2,500,000 geological map of the Alpha Regio (V-32) quadrangle, Venus. The V-32 quadrangle extends from 0° to 25 S, 0°to 30° E with an area of approximately 7,600,000 km^2. Geological mapping was conducted using full resolution (maximum 75 m/pixel) SAR, altimetry and stereo-derived topography data from NASA's Magellan mission in ArcGIS 10.5. Nearly 40,000 lineaments were mapped. The oldest unit, tessera terrain, is present in two major regions: Alpha Regio and Minu-Anni Tessera. Two major fracture belts, both oriented approximately NNW-SSE, and four minor fracture belts have been identified and characterized. Two previously unrecognized wrinkle ridge trends of radiating and circumferential orientation have also been identified in the northeastern corner of the quadrangle. A total of 77 geological units were mapped. Plains material, previously mapped as global regional plains units, was divided into 27 units. Earlier estimates of the diameters of several coronae have been extended by hundreds of kilometers.
This quadrangle hosts the presence of several coronae and numerous other tectono-magmatic features. There are five named coronae: Atargatis, Cybele, Fatua, Kuan-Yin, and Thouris, as well as an additional unnamed corona-like structure located approximately 60 km northwest from the annulus of Cybele Corona. There are also volcanic flows, and circumferential and radiating extensional lineaments that may be attributed to Heng-O (in the neighboring Sif Mons (V-31) quadrangle, to the northwest) and Thermuthis Coronae (in the neighboring Scarpellini (V-33) quadrangle, to the east). Other major geological features include the extensive Alpha Regio and the smaller Minu-Anni tessera terrains, Dewi-Ratih Chasma, Dudumitsa Dorsa, Brynhild Fossae, Graham Patera, and Banumbirr Vallis. Several impact craters are also present throughout the map area: Lara (not shown on the accompanying map, due to its limited extent of <5 km), Vanessa, Linda, Rebecca, Xantippe, Leslie, Frank, Karen, Carreno, Paige, Tiffany, Andami, and Adamson. The largest crater is Carreno, with a diameter of approximately 60 km.
The V-32 quadrangle is situated in the low-lying volcanic plains (Tinatin Planitia), evidenced by the altimetry and geoid data, with the exception of the Alpha Regio highland. A large proportion of the quadrangle is dominated by the coronae and their associated structures and volcanic units. Other notable tectonic domains include many densely spaced NNW-SSE trending extensional structures surrounding Dewi-Ratih Chasma along the western boundary of the quadrangle, and a regional system of ENE-WSW trending, relatively long (>100 km) and closely spaced wrinkle ridges that are prevalent in the northern half of the quadrangle.
For a listing of layers in the download zip file, see the V-32_readme.txt (under ancillary).
Datasets:
The primary datasets used for this map were collected during NASA's Magellan mission. A map package for the V-32 quadrangle consisting of Magellan datasets (stereo- and left-looking SAR FMAPs (mosaicked full resolution basic image data records (F-BIDRs)), C3-MIDRs (compressed mosaicked image data records), and the Global Topographic Data Record (GTDR)) and an ArcGIS database was provided by the USGS Astrogeology Science Center. Additionally, stereo-derived topography generated by Herrick, Stahlke, and Sharpton (2012) using Magellan left-looking and stereo left-looking data was used to inform geological mapping. The stereo-derived topography has increased the resolution of the Magellan topography dataset from an average original horizontal resolution of approximately 10–20 km, to a horizontal resolution of approximately 1–2 km and a vertical resolution of approximately 100 m. This newly derived topography dataset covers approximately 20% of the surface of Venus, and 50% of the V-32 quadrangle. However, due to inconsistencies in the absolute elevation values along the boundaries of the F-BIDRs, the stereo-derived topography dataset was primarily used for analysis of relative elevation values and generalized morphologies of features.
Reference:
Bethell, E. M. Ernst, R. E., Samson, C., 2019 Geology of the Alpha Regio (V-32) Quadrangle, Venus, Journal of Maps, 15:2, 474-486, DOI: 10.1080/17445647.2019.1614489.
Herrick, R. R. , Stahlke, D. L. , Sharpton, V. L., 2012. Fine-scale venusian topography from Magellan stereo data. Eos, Transactions American Geophysical Union , 93 , 125–126. DOI: 10.1029/2012EO120002
- Publisher
- Journal of Maps
- Publication Date
- 21 May 2019
- Originator
- Erin M. Bethell, Richard E. Ernst, Claire Samson
- Group
- PDS, MRCTR
- Added to Astropedia
- 30 November 2021
- Modified
- 15 December 2021
General
- Purpose
Geological map of the Alpha Regio (V-32) quadrangle, Venus.
This map has not been reviewed by the USGS and we are relying on the acceptance of the map and description by the Journal of Maps (JOM)
- Edition
- 2019
- Online Linkage
- https://planetarymaps.usgs.gov/mosaic/Venus/Geology/Venus_GIS_Geological_Map_of_the_V-32_Quadrangle_Bethell_v1.zip
- Native Data Set Environment
- ESRI Arcinfo
- Color
- Color
- Supplemental Information
- https://doi.org/10.1080/17445647.2019.1614489
Keywords
- Target
- Venus
- Theme
- Geology, Geomorphology, Geographic Information System (GIS), Photogeology, Terrestrial planets, Remote Sensing
- Mission
- Magellan
- Instrument
- Radar
- Search Terms
- Venus, Alpha Regio, geology, planetary geology
Contact and Distribution
- Access Constraints
- please cite authors
- Access Instructions
- Files are GIS compatible
- Use Constraints
- public domain
Data Status and Quality
- Progress
- Complete
- Update Frequency
- None planned
- Logical Consistency Report
- These data are believed to be logically consistent. Line geometry is topologically clean.
- Completeness Report
Geologic units and structures are mapped covering the full V-32 quadrangle at 1:2.5M scale.
- Process Date
- 22 September 2018
- Process Description
Nearly 40, 000 lineaments were mapped. The oldest unit, tessera terrain, is present in two major regions: Alpha Regio and Minu-Anni Tessera. Two major fracture belts, both oriented approximately NNW-SSE, and four minor fracture belts have been identified and characterized. Two previously unrecognized wrinkle ridge trends of radiating and circumferential orientation have also been identified in the northeastern corner of the quadrangle. A total of 77 geological units were mapped. Plains material, previously mapped as global regional plains units, was divided into 27 units.
- Horizontal Positional Accuracy Report
- Accurate to Control Net
- Entity and Attribute Overview
- Field attributes are available in the GIS files which define the geologic units. See paper for unit descriptions.
- Entity and Attribute Detailed Description
- Bethell, E. M. Ernst, R. E., Samson, C., 2019 Geology of the Alpha Regio (V-32) Quadrangle, Venus, Journal of Maps, 15:2, 474-486, DOI: 10.1080/17445647.2019.
- Entity and Attribute Linkage
- https://doi.org/10.1080/17445647.2019.1614489
Lineage
- PDS Status
- Locally Archived
- Source PDS Archive
- Magellan
- Source Originator
- Journal of Maps
- Source Publication Date
- 21 May 2019
- Source Title
- Geology of the Alpha Regio (V-32) Quadrangle, Venus
- Source Online Linkage
- https://doi.org/10.1080/17445647.2019.1614489
- Type of Source Media
- Online
- Attribute Accuracy Report
- Best Effort
Geospatial Information
- Location Description
- Alpha Regio
- Minimum Latitude
- -25
- Maximum Latitude
- 0
- Minimum Longitude
- 0
- Maximum Longitude
- 30
- Direct Spatial Reference Method
- Vector
- Object Type
- Polygon
- Quad System
- Venus 1:5M
- Quad Name
- V-32
- Radius A
- 6051000
- Radius C
- 6051000
- Control Net
- Magellan F-Map
- Horizontal Coordinate System Units
- Meters
- Map Projection Name
- Mercator
- Latitude Type
- Planetocentric
- Longitude Direction
- Positive East
- Longitude Domain
- -180 to 180