figure 1 
- 60 - 
USGS Orthophotoquad 
July 1971 
' A 
M.= 
► Y + + 
,*AY + 
= AAYM( 
= /YYM 
^ / = = M 
<+Y=* 
A+AY/ 
A AA + A 
AA + + Y 
A + + +Y 
A+YA= 
A YYY = 
AAYY = 
A + YYA 
A+Y + + 
CAY + Y 
i' + tYA 
CYAA + 
AY AA 
rY KM 
CY KM 
= // = M 
A A = = Y 
1/ = = A 
1 AA = M 
AY/=Ai 
= AA// 
E / / / A 
--/// + 
*== = M 
' ==7y 
Y/YMY== 
MM//=== 
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//=*=== 
= =.•= = = AA = * 
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= = = =. YY= * 
= = = = = YY=. . 
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Y +YY + = = = = = 
I M» • • • = = 
l A 
AA/AMf 
► YYA/ 
AAYY/ 
f + AM/ 
► + AM/ 
C+Y = / 
'A=// 
AAM// 
1MM/M 
CY//M 
1M//A 
f = / =M 
CY*’ ' 
1*M/ = 
1MM = = 
AMMMY 
••• M***...•. 
.MMM*** 
. 1 *MYM 1 •*. . ' 
..***M*. A*M. 
•*. .. .MA* = = 
'*M=*I==.•.. 
=======a========aaaaaa 
>•======A==AAAA==I 
>,=========A=====. 
•.===A=====A/=.' . = = 
,..====/===A/AA==== 
= = / + = = ■•'/A AAAA + A + -Y 
—+ - +A+AY++A=AAM 
,===A= +++A+Y'= 
===*=//==AA=*Y*Y*==M= 
===//=A+A*YA==M=*M= 
= = = = = = = A + + YYAY + * M. = = 
..===AAY++Y//Y*A=.=== 
.M==Y+YA+A=**AA==.=A 
• • • .Y + Y+- + AAMYY = MA = = = 
'.M==YYAYAAY==+Y/A=A 
••.===A=-=A=====,=A+ 
=.===A=====..==•. = A = 
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/AAAAAA//MAY//////=====YAA-=-A=====.=/== 
/YYAA/YM/A=////===A====== ====M==== 
l///A//YYA========/M===.======M.==M=== 
/KMA/////A/AAA=====//=..=======M.====== 
/=/M/////MAA ////=//MM==..===.=**YYAY== 
///AAYA+++YKKYAA////YY=====//=YYAAAYM== 
/MYYAAAAA+=YAAAAYMMKM/==///MMAAA*.=AM/= 
YAYYYAAAAAAAAAAAM/==M==MY///Y/AY=.YYM/= 
/AAYYAYYAAAYAAAAY=MMMM///==MAYMM=//A/// 
MYAYYYYYYYYYY*AYM=M==MMMMMMM=MMMMMM YA/ 
MYAMYYYYYYYYY*+YMMM==MMMMMMMM=MMMM= KA/ 
MAY AYYYYYYAAY**YAMMM=MMMMMMMMM=MMMMM==/ 
AA+=MM 
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/***+*****AYM 
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= = = YYY . .= 
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mmm, 
■ 1 M = = 1 
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MM=M , 
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MMYM=.=*+++/= 
MMYM.=M+++AAl 
.MM = MMMMMMMMMMMMMMM = =M = = ; /A = / 
*MYM.MMMMMM=MMMMM=M==M=//A+~YA*++///=// 
****..MMM = = =.MMMMMMMMMM = = AA/•*■ + + +++YYY* 
'I I 1 .M/M''= = = .MMMMMMMMM = = AAAAA+ + + * + Y 
• II = *'MM''M=MMMMMMMMM = M = AA + + AA+ ++ + + Y + 
...=M'M..MMMMMMM=MMMMMMMA++++Y+ ♦ ♦=♦+ 
...=M..==.MMMMM=/MMM=+==AAA=AA+ ♦ + ♦ 
..========/====M/===YY=/AAAAA+/ =====. 
,M======M*=====M/M==M==/A++A+A=A ••==== 
.***==.•III/====YMMMMM==/A+AA - =•==== 
..=MMM=.IIK=.======MM=M*AA+AAA= = = = == 
.==MMYM 1 ••M/..M=MMMMM=M//==AAAA •===== 
.MM===='•.====MMMMMMMMM=+++AA= ==•=====. 
.MM==M.=====MMMM=MM=MM=AA++AAAAAA*===//A 
.M===MM=M=M=MMMM==MMMM=AA++A++AAAAYAAAAA: 
1MM==M=MMMMY=MM===MMMM=/A++AA+Y<-+AAYAAAA 
.=M=MMMMMM=AMMM===MMMM=A+++AAA++ AA+AAA 
.=MM=MMMMMYAMYMY=MMMMMMAY+AYAAYA+ + AAA 
=MMMMMMMMMYYY=MMMMMMMMAAAA++++A4-YYYY+A+* 
=MM=MMMMMMMY=MMM=MMMMM=*AA++++AYYYYYYA++ 
*MMMMMMMMYMN=MM=MMMMM=A AAAAAYYYAYA+ + 
.'M=M=MMM==MMMM==MMMMMYAAAAAA+YYAAA+++++ 
=====MMMM=MMMMMY=MMMMMYAAAAAAA==**AA+++ 
==M===MMY=MMMMMMMMMMMMYAAAAAA+A..M*A++++ 
==M========M MMM==MMMMAA+AAAAA...=+++++A 
====IMM=/=YMMMMM=AMMMM=====AA/==M*YAAAYM 
= = = =I IMMMM=MMMM=AYMMMM======/= M I 1 Y** 1 ' = 
..=M=//MM//=MMMMYYMMMM==========.YIIM.M/ 
...KM/MMM//MM=MMMMMMMM==========A======/ 
+AA=KYYYY//MM/==/=M===/=AAAAAAAAAAAAAAA+ 
+AA=KKK=M=/M/MMM/MM==A/=AAAAAAAAAAAAAAA+ 
VYAMMMMMM=//MMMMMMMMM/AAAAAVVVVAAY*AV4.AA 
ERTS Computer Map 
Oct 72 and May 73 
In this comparison of a line-printer map with a USGS orthophoto (both 
originally at the scale of 1:24,000 and fitted with the 5 km UTM grid), the 
rural-urban interface is clearly shown. The sharp boundary between the resi 
dential extension of Scottsdale, Arizona and the agricultural land to the east 
shows up on the computer map as a distinct break between symbols representing 
urban (M -- Residential, I -- Commercial/Industrial, K -- Transportation, 
+ -- Irrigated Open Space) and rural (A -- Cropland and Pastureland, 
Y -- Orchards, = -- Desert, / -- Desert). 
Besides doing a good job in mapping existing land use, the ERTS map shows 
considerable promise for detecting quickly land-use changes. Two parcels just 
west of the already built-up land were cleared by the time of the 1971 ortho 
photo. During the ERTS passes they were sites of advanced construction and 
show up on the ERTS map as one type of urban expansion (*). A huge area of 
expansion is not evident at all on the orthophoto. By the time of the ERTS 
passes though, the desert had been stripped and construction started on a new 
subdivision to the northwest of existing development. This area of key environ 
mental concern shows up quite clearly on the ERTS map (. and '), differentiated 
from all other types of land covers including the spectrally similar desert.