publications and then to add them to the library of symbols. 
Authors’ symbols can be submitted to Cartography in a 
digital format which is then imported into ARC/INFO. 
Cartography will attribute contacts and faults 
after scanning. 
Contacts in parallel should be no closer than the 
ink width of the contact (i.e. line weight 0.012", 
the distance between the parallel contacts should 
be no less than 0.012") 
Close geological contacts through open bodies of 
water; all contacts should be closed polygons. 
Tie edges to adjoining sheets. 
B. Structural symbols and reference letters must be 
placed on a separate overlay. 
PREPARING GEOLOGICAL MAP DATABASE 
DEFINITIONS 
Guidelines for this file and coverage specifications for a 
digital geology database are being prepared by the GICD 
Computer Technology Section. If you wish to have a 
preliminary copy or some input into these guidelines, 
please contact either Cartography or the Computer 
  
C Any additional information such as radiocarbon date 
boxes, area showing drift cover, etc. should be ona Technology Section 
separate overlay. 
D. Compile on a photolysis or reverse cronaflex image, DIGITAL BASE SOURCES 
and include at least 4 reference points (tics) at known 
latitude and longitude co-ordinates for maps at both 
1:250 000 and 1:50 000 scales and every 1 or 2 
1. NTS 1:250 000 and 1:50 000 bases. These can be 
ordered from NRCan (613-995-0314). 
2 ESRI, DCW, 1:1 000 000. These bases are available 
0g, scanned degrees (including the interior co-ordinates for to GSC users for geological map production. The 
ols, surround smaller-scale mapping). Ensure that the manuscript coverages are in geographic co-ordinates of 5 degree 
included the is carefully registered to the base. Indicate each by 5 degree tiles. 
rocedures, overlay by map name, theme (i.e. contacts), a date, : ; ; ; 
prose to and a number identifying the overlay as 1 of 4. 3. a 500 000 and 1:2 000 000 bases in 
Maximum size is 40" x 70". 0 : : 
4. ESRI, Arc/World at 1:25 000 000 and 1:3 000 000 in 
ARC/INFO format. 
PREPARING GEOLOGICAL MANUSCRIPTS FOR : : 
5 expertise by Itis sometimes faster to use a digitizing tablet to convert DIGITAL GEOLOGY SOURCES 
procedures, imagery to digital data. This image must be carefully 1) CAD DXF from PC AutoCad systems and MAC CAD 
Jata sources, 
direction for 
registered to planned publication base. How data is 
converted depends on what hardware and software is 
available, and on the expertise available to use it. At GICD 
Cartography, scanning technology is used as much as 
systems. These files are imported into ARC/INFO 
with the DXFARC command. 
2) DLG (digital line graph) from Intergraph or SPANS are 
imported with the DLGARC command. 
IIC BASES possible. Large format digitizing tables are available to 3) Raster files (TIFF, RLC, SUN raster file) 
add new or edited line work to previously scanned and 4) ARC/INFO software 
dery from vectorized imagery. 5) Spans software 
tion suchas PREPARING DIGITAL GEOLOGICAL SYMBOLS FOR 
rivate sector 
Wh quali) PLACEMENT ON THE MAP HARDWARE AND SOFTWARE 
ata resolution 
ake the base 
This can be a challenging task for both the geologist and 
1) One Sparc10 Server 
2) 18 Sparc2 workstations 
sed systems, cartographer. There are hundreds of structural symbols 3) 19 Arc/Info 6.1.1 licenses 
artography to used on geological maps, and the Cartography Sectionis 4) 1 PC-ARC/INFO 3.4d running on a 486. 
y. Publication only just beginning to build its own symbol library. Each 5) 5 Island Graphic licenses 
hg 9600010 ib must be designed and digitized into a template, so 6) 4 AutoCad stations, 1 with ArcCad overlay 
chnologies to at it becomes an object which can be positioned and ; ; 
rotated at a referenced point location on the map. With 3) S Tetfonec x terminais. 
ARC/INFO, the symbol is designed and stored as a 
RIPTS ‘marker symbol” that can be scaled and rotated. The CONTACTS 
author can supply an ASCII or DXF file containing location, Chief, Cartographic & Reproduction Services, 
we. and angle of each symbol. Cartography then adds John Bill... 613-996-9348 
e symbol to its library. Cartography is cooperating with ‘ 
! a photolysis her GSC divisions ahd alee with the USGS te 051001aPhy UMS 
fting pens as accumulate an extensive symbol library. This will require Vern FOSter........-- erre 613-996-9358 
considerable time and effort. It has taken years to build up Gary Labelle. ............... errr 613-943-0738 
n). he library of templates for traditional geological maps, and Computer Technology Section 
as possible, it will require effort and resources to put all these symbols John Glyrin. .........—.-- ren 613-996-0168 
1 unbroken. into a digital format. The approach is to create the new Paul Huppé...................—-- 613-943-0996 
digital symbols on an "as required basis" for new Rob Duns. .........— eren 613-943-0996 
295