(LAC-60) Geologic map of the Julius Caesar quadrangle of the moon
July 31, 2019

The origional Geologic map was created in 1967 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 1:125k, 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 I510_JuliusCeasar_LAC60_1M.gbd

I510_GeoContacts (polyline feature class)
I510_GeoUnits (polygon feature class)

Moon2000_Mercator_CLon20
Projection    	Mercator

Zunits        NO                                                                
Units         METERS                                                            
Xshift        0.0000000000                                                      
Yshift        0.0000000000                                                      
Parameters 1737400.0000000000  1737400.0000000000                               
20.00000 /* longitude of central meridian                                   
1.000 /* latitude of true scale                                          
0.00000 /* false easting (meters)                                       
0.00000 /* false northing (meters)
0.0 /* SP1
0.0 /* 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	251	104
Ccd		255	105	94
Cc		255	248	134
Ccw		254	221	109
Ccr		254	249	163
Ccrh		255	251	157
Ccrr		255	254	182
Ccf		255	176	105
Ccfs		254	194	104
Ccfh		255	172	122
Ccp		255	133	113
Csc		255	134	100
Ec		173	220	155
Ecr		173	220	155
Ecrh		173	220	155
Ecw		180	229	187
Ecrr		213	241	190
Ecf		165	222	131
Ecfs		213	234	126
Ecp		142	215	132
Ipm4		197	172	167
Ipm3		219	187	185
Ipm2		229	194	193
Ipm1		248	211	214
Ipd		241	136	143
Eic		149	222	211
Eicr		149	222	211
Eicw		143	212	189
Eicf		153	198	180
Eisc		133	214	197
Eib		164	189	178
Icw		194	144	171
Ic		255	255	255
Icr		175	145	171
Icf		223	174	194
Ica		216	194	208
It		238	187	182
if		255	255	255
Ifh		166	195	218
Ifs		180	207	221
pIc		224	140	116
pIu		231	169	151
Ld		255	176	168
dd		250	145	132
ch		254	100	106


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