Object models for computer aided design

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151 ': 1": :.. s i z -: e r p ret a : i 0 r. , :. t, e IT. i n e is c i v i j e c5 in t. c 11 sec t ion 5􁪽􋴚􁪽􋴲2re5" 􁪽􋴚􁪽􋴺:ch are 420 foet ;la􁪽􋵡ar squares 􁪽􋵴ta􁪽􋵡 are 5C feet a;i:t :􁪽􋴚 􁪽􋴚􁪽􋴦& c:tho􁪽􋵡ana: 􁪽􋴺:rec􁪽􋵩icn. fiq􁪽􋵲re 6.3(a,b) shows 􁪽􋵳 s:;-:􁪽􋵬le section square and a 􁪽􋵲roup of s􁪽􋵣ction $q􁪽􋵡ares. A:ter selecting the section square(s) or. which he wis􁪽􋵥es to 􁪽􋵣cr􁪽􋴬, 􁪽􋴚􁪽􋴚􁪽􋴚 􁪽􋵳ser reqU&!t5 the drilling to be dis;layed (see figure 6.3(c)). A:l exploratory drill holes which come 􁪽􋵬lt;-:l;-: 25 feet of t􁪽􋵥e c􁪽􋵲rrer.t section are displayed. The 􁪽􋵳se: 􁪽􋴲2y then di5pl􁪽􋵹y only those parts of the holes which 􁪽􋵡ave hisher th2n a certain grade or exa􁪽􋵩ine in􁪽􋵩ivicual assay qrades by pointi􁪽􋵧g to the assays. Ore waste boun6aries are drawn in from the tablet 􁪽􋵮nd rray be modified o􁪽􋵣ce they have been entere􁪽􋴮. The operat6r continues to wor􁪽􋵷 with these toundaries, often on 􁪽􋵥everal souares until t􁪽􋴦& i􁪽􋵴t􁪽􋵲rpretation f;􁪽􋵯o the drilling and satisfies the c􁪽􋵥erators qeological intuition (see figure 6.3(0)). Once the ere/waste lines have be@n drawn in on a secticn and t􁪽􋵥e operator is satisfied with them, he must ?oi􁪽􋵴t out t􁪽􋵥e boundaries of the ere ?atches. Cntil he does t􁪽􋵩i􁪽􋴬, the 􁪽􋵡ata struct􁪽􋵲re sirr;ly cont􁪽􋵩ins a set of linee. T􁪽􋶬€􁪽􋵥e l:nes m􁪽􋵳st be associated as boundaries of the ere tody before this infcrrration is 􁪽􋵳sef􁪽􋵬l for other than