(LAC-24) Geologic map of the Sinus Iridum region of the moon
October, 17, 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 1:300k, 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.

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Data are saved in a feature dataset in I602_SinusIridum_LAC24_1M.gdb

I602_GeoContacts (polyline feature class)
I602_GeoUnits (polygon feature class)

Moons2000_LambertConformal_CLon26
Projection    	Lambert_Conformal_Conic

Zunits        NO                                                                
Units         METERS                                                            
Xshift        0.0000000000                                                      
Yshift        0.0000000000                                                      
Parameters 1737400.0000000000  1737400.0000000000                               
26.00000 /* 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.

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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

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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.

GeoUnit		      RGB

Cs		255	254	4
Cch		254	112	147
Cc		253	253	21
Ccr		253	255	59
Ccrh		255	249	110
Ccrr		254	253	154
Ccsc		252	225	183
Elc		45	208	188
Elcr		33	203	180
Elm		194	192	180
Ec		112	208	99
Ecr		123	219	125
Ecrh		119	217	128
Ecrr		161	234	152
Ecw		93	206	144
Ecf		74	184	39
Im3		206	168	164
Im2		232	189	190
Im1		248	196	201
Id		228	110	103
Ip		185	181	207
Icr		146	130	170
Icf		150	171	202
Icw		150	119	155
Iirh		190	95	131
Iirr		231	132	162
Iiw		157	95	133
plu		199	131	90


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