Unified Geologic Map of the Moon, 1:5M, 2020

This new work represents a seamless, globally consistent, 1:5,000,000-scale geologic map derived from the six digitally renovated geologic maps (see Source Online Linkage below). The goal of this project was to create a digital resource for science research and analysis, future geologic mapping efforts, be it local-, regional-, or global-scale products, and as a resource for the educators and the public interested in lunar geology. Here we present the completed mapping project as unit contacts, geologic unit polygons, linear features, and unit and feature nomenclature annotation. The product overlies shaded-relief products derived from SELENE Kaguya terrain camera stereo (equatorial, ~60 m/pix) and LOLA altimetry (north and south polar, 100 m/pix). These data are not included with this download due to size considerations, but a readme in the "Lunar_Raster" folder provides the download links. This download page includes a PDF of the geologic map (right-side) with a brief Description of Map Units and Explanation of Map Symbols, as well as a JPG of the map for quick access viewing. This release is subject to update based on community feedback and peer-review.

Version 2 updates: Two errors were addressed in this update: (1) Large area polygons were offset from their contacts, likely due to user error. Polygons were rebuilt to fix the issue and post processing (dissolving, reattributing, etc.) to rectify the aesthetic of the map. (2) Contacts were not visible but should have been due to incorrect labeling as DND (do not draw). Those that needed to be drawn have been reattributed as "certain" those that are not drawn are labeled as "internal". Additionally, in version 1 of this data, crater polygons with similar attributes had been dissolved and lumped into contiguous units. This has been changed so that all craters are now discrete units. This adds ~1000 units to the GeoUnits featureclass and the related contacts are now visible and labeled as "certain".

References:

Fortezzo, C.M., Spudis, P. D. and Harrel, S. L. (2020). Release of the Digital Unified Global Geologic Map of the Moon At 1:5,000,000- Scale. Paper presented at the 51st Lunar and Planetary Science Conference, Lunar and Planetary Institute, Houston, TX. https://www.hou.usra.edu/meetings/lpsc2020/pdf/2760.pdf

Mimetype application/zip Filename Unified_Geologic_Map_of_the_Moon_GIS_v2.zip Publisher Astrogeology Publication Date 3 March 2020 Author Corey M. Fortezzo (USGS), Paul D. Spudis (LPI), Shannon L. Harrel (SD Mines) Originator USGS Astrogeology Science Center Group PGM, MRCTR Added to Astropedia 19 December 2019 Modified 19 May 2020

General

Purpose The chief purpose of the 5M scale map is to summarize the current state of lunar geologic knowledge. Like terrestrial synoptic maps it provides a stratigraphic framework to be used for developing new theory and for determining the regional significance of surface exploration results. In addition to serving as a framework for interpreting surface exploration results, the effort to classify units into type and age by photogeology narrows the range of possible origins for many features. Geospatial Data Presentation Form Geologic Map Edition 2.0, March 3, 2020 Native Data Set Environment ESRI Arcinfo Color Color Supplemental Information https://www.hou.usra.edu/meetings/lpsc2020/pdf/2760.pdf

Keywords

System Earth Target Moon Mission Lunar Reconnaissance Orbiter, Kaguya Mission Specific SELENE (Kaguya) Instrument LOLA, TC Search Terms geology, structure, , basin rings, contacts, units, moon, lunar, selene, 5 Million Scale, global

Contact and Distribution

Access Constraints none Access Instructions GIS software will be required to view the files. Use Constraints please cite authors

Data Status and Quality

Currentness Reference Publication date Progress Complete Update Frequency As needed Logical Consistency Report These maps are updated and sometimes a reinterpretation of the original geologic units or relationships. Completeness Report This release is globally produced at a 5M scale. Process Description The current renovation of the digital maps adhered to strict guidelines for vector generation and used recent datasets to spatially adjust the location of the geology and linework. The data sets discussed above were used in combination with ESRI’s ArcMap Geographic Information System (GIS) software, to draw vectors on the shaded-relief derived from SELENE Kaguya terrain camera stereo (equatorial, ~60 m/pix) and LOLA altimetry (north and south polar, 100 m/pix). The vectors were drawn with a consistent vertex spacing of ~3 km at 1:1.5M scale, and were smoothed using a maximum allowable offset tolerance of ~16 km. The adjustments and adherence to these guidelines resulted in a product that increased the feature location accuracy at the 1:5M scale and makes the product more cartographically appealing. Horizontal Positional Accuracy Value 500 Horizontal Positional Accuracy Report Accurate to Control Net Entity and Attribute Detailed Description Brief units are described in the released PDF map.

Lineage

Source Originator U. S. geological Survey Source Publication Date 1 March 2013 Source Title 1:5M Lunar Geologic Map Series Source Online Linkage https://astrogeology.usgs.gov/search/map/Moon/Geology/Lunar_Geologic_GIS_Renovation_March2013 Type of Source Media Online Attribute Accuracy Report Best Effort

Geospatial Information