7 
INT.DUP.,D.C.64- 41 5 M 1 
attached orthophotomap is one of several that were considered most effective. 
In this rendition, the photoline images are shown in dark gray; the photo 
tone images in gray-green; the principal roads and their numbers in red; 
the major hydrographic features in blue; the wooded areas in green; and 
the names data and marginal information in black. 
This form of map presentation may be particularly advantageous in 
densely settled areas and, conversely, in areas of very sparse cultural 
detail. In urban areas the orthophotomap minimizes the need to delineate 
and scribe the congested planimetrie detail, thereby offering savings 
over the standard planimetrie compilation. In areas where little planimetrie 
information would be shown on the standard line map, such features as lone 
trees or bushes, generally ignored as map-worthy features, are readily 
identifiable on the orthophotomap and usable as landmarks. An experimental 
orthophotomap of such an area in the State of Arizona is now being prepared. 
Further development of the orthophotomap will depend largely upon 
its acceptance by the map-using public. It is quite possible that map 
users have become too accustomed to the simplicity of line drawings and 
the clarity of cartographic symbols. They may be reluctant to assume the 
task and responsibility of photointerpretation required in using an ortho 
phot omap . 
The amount of cartographic symbolization that should be added to an 
orthophotomap to satisfy public needs has not been finally determined. 
It is expected, however, that the cost of this additional cartographic 
work will not significantly reduce the advantages of orthophotomaps.