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The Property Identification Map is the source data
for the preparation of the County Street Map at 1" =
2000*. Once a year all of the Property Maps are printed
for the purpose of picking up new streets. The new
streets are marked over with a magic marker to make them
readily identifiable. The full scale map is then
reduced to 1"=2000' through the use of a digitizer and
plotting board. The neat line of the map is plotted and
all new streets are plotted. Often one or two of the
major roads are plotted to assure better control of the
new streets on the overall county street map at 1"=2000',
These reductions are controlled to proper location by
aligning them with existing street patterns.In areas of
all new development the index grid is used for control.
This grid was prepared with the use of a Computer
Plotter to gain as much accuracy as possible. This grid
is established on a geodetic projection and each
intersection represents a base map sheet corner.
The new streets are scribed on the original scrib
coat street map base. The street names are then trans
ferred to the street name overlay and positioned for
best readability.
The street map base is divided into four quads at
the scale of 1" = 2000'. The full county map would be
seven and a half feet square. By dividing it into the
quads it is made easier to work with. The old street
base map was scribed on a 1 " = 4 0 0 0' base and it was
found to be much to tedious to work with.
The complete process for the preparation of the street
map is done in-house. When the package goes out to the
printers it is camera ready. Most of the maps printed
in color are done using flat inks. Some of the maps,
the County Hide Land Use Map for example, have so many
zones that process colors are used.
For most map production the 1"-2000' scale base is
mosaicked and reduced to 1"-4000'. Overlays for infor
mation data are overprinted on the base map. The annual
map printing for the County of Fairfax is about twelve
different maps with a total of 7000 maps more or less.
Not all maps are printed every year.
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