(LAC-39) Geologic map of the Aristarchus region of the moon
September 20, 2019

The origional Geologic map was created in 1966 from Lunar Base Chart USAF-ACIC imagery. To make this map more useful with modern data it has been georeferenced to align with the more modern 2013 LROC-WAC global mosiac. Links used to transform the data are included with this documentation. A polyline feature class was created to digitize contacts at 1:200k, and attributed with contact type. A polygon feature class was created from this polyline feature class, attributed with geologic unit labels, and symbolized based on RGB values identified from the map sheet TIFF in Adobe Photoshop.

------------------------------------------

Data are saved in a feature dataset in I465_Aristarchus_LAC39_1M.gdb

I465_GeoContacts (polyline feature class)
I465_GeoUnits (polygon feature class)

Moon2000_LambertConformal_CLon40
Projection    	Lambert_Conformal_Conic

Zunits        NO                                                                
Units         METERS                                                            
Xshift        0.0000000000                                                      
Yshift        0.0000000000                                                      
Parameters 1737400.0000000000  1737400.0000000000                               
40.000 /* longitude of central meridian                                   
1.000 /* latitude of true scale                                          
0.00000 /* false easting (meters)                                       
0.00000 /* false northing (meters)
21.3333 /* SP1
42.6666 /* SP2

Separate shapefiles of the two feature classes are located in the ...Data/Shapefiles/ directory.

The coordinate system used for this digitization is based on the coordinate system stated on the map sheet and is stored in ...Documentation/CoordinateSystems/ directory.

------------------------------------------

Basemaps have not been included in this download package, but the most current base using THEMIS data is available through ArcGIS Online or can be downloaded at the following link:
https://astrogeology.usgs.gov/search/map/Moon/LRO/LROC_WAC/Lunar_LRO_LROC-WAC_Mosaic_global_100m_June2013

------------------------------------------

Below are the RGB values sampled from the scanned map sheet used to symbolize geologic units and saved as a layer (*.lyr) file in the ...Data/LayerFiles/ directory.

Unit		R	G	B

Cs		255	255	77
CC		255	255	23
Ccr		254	254	197
Ccrd		251	226	94
Ccf		246	182	128
Ccp		255	229	112
Csc		255	199	152
Cev		255	250	5
Ch		232	171	151
Csr		255	249	165
Ec		211	242	212
Ecr		242	248	192
Ecf		193	219	143
Ipm		255	255	255
Iph		223	156	204
Ipd		238	170	191
Ipr		243	159	200
Idcr		247	229	233
Idcf		236	224	249
Eic		229	230	18
Eicr		225	217	2
Eicf		200	188	53
Eih		184	213	34
Eisr		160	214	167
Icr		159	186	232
Icf		242	244	255
If		151	195	236
ch		246	59	85
rc		223	39	94


------------------------------------------

For more information, contact:
Michael Ortigoza
Mortigoza@contractor.usgs.gov
USGS Astrogeology Science Center
Flagstaff, AZ
(928)556-7177