the second part. Excesses over middle flatness are
+10m. Maps and plans were found in1978. For
every part on a transparent base blue, black and
double -side black-blue copies of originals of
changes, conserved contours and combined were
made. In process of correcting it was discovered
that map 1:10 000 and plan 1:2 000 comply with
demands of precision made by normative
documents. For a map middle excesses contained
corsespondingly 035mm and 0.37 m on corrected 16
plane points and 27 height points; for a map
correspondingly on 12 and 27 points - 0.22 mm and
0.14m . Accuracy of plans 1:500 of 1984 year survey
did not comply with demanas of normative
documents, that is why the were not liable to
revision.
If during period of works it was impossible to change
a part of area they used points of a 1,500 plan of
tacheometric survey of 1993 as check ones.
2.2 Preparatory work.
Before flying on MDP, in various regional and town
organizations materials were gathered; with their
help they defined degree of modernity of maps and
plans. Air images of previous years (1991),general
plan of town of scale 1:10000, statistic reference
books of censuses of the population, materials of
autoroads, nature hydrography, ingeneer
buildigs,etc. were used.
By these materials photokeys of in terpretation on
"old" air images and fragments of map originals with
due regard for some special things for various
stages of work were contained During spade-work
preliminary photokeys on plan airimages of 1991
year of scale 1:18000 (for map of 1:10000) and
helicopter images of 1992 year of a scale 1:4000 (for
plan it is 1:2000). Number of objects, which lists
were given in description to photokey were marked
by arrows and numbers. Besides, a method of
iterpretation ( by field method with air images, with
department cartgoraphic materials) was shown.
Some columns served for marks, got from
reconnaissance flight, videofilm, and field inspection.
Objects that need airvisual or field inspection ( when
landing MDP) were marked with "?".
During period of field preliminary works base of fly-
survey group and field photolaboratory, area of work
was studied and the main runway of 150x20m was
chosen, land marks were adjusted. To choose a
runway it was necessery to take into account
direction of winds. Pilot had documents giving him
the right to pilote MDP with a pas sanger; it was got
from local organizations of Federal microlight avia
tion. A pilot must have practical experience of
working with equipment; the second member of a
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B4. Vienna 1996
322
group must be a topographer or cartographer with
experience of interpretating of images.
2.3 Reconnaissance flights. Videofilm making.
Before survey and interpretation works training
reconnaissance flights on MDP at altitudes
100,150,200m were realized to study a region of
works, correct communication and equipment.
During the flying, an information about the changes
of the area was recorded under the numbers and
was marked on a paper copy of map, fragments of
original or on air-photo and also characteristics of
objects and elements of an area, that were
impossibe to recognize in flight, werw also recorded.
In areas where elements of the area during flying
were not recognized, landings were done. New and
changed elements were marked by measuring by
polar method. As a result of recognizing flights a
scheme of interpretation flights and landings was
written, excluding photokey.
In a process of survey video-film special attention
was paid to a day-time(morning hours)because the
main signs of recognazing of objects are color and
britghness. Voices connection with objects and area
elements,names and descriptions were done under
their numbers.First line of a flight and geographic
names were marked.Ai rvideofilm was studied by
looking through on video and joining of information
with the elements of a map and airimages.In
videofilm changes of roads contours and boards of
nature, appearing of new gardens,buildings and
desappearing of old ones are seen clearly.By the
information got from videofilm the photokeys,where
objects and elements of area were marked by
red,green,brown and black colours,were prepared by
new method;they were interpreted accordingly by
the lab method,from MDP, by video-film,department
materials,in field inspection. For a map of scale 1:10
000 four photokeys for the main local areas were
created (see T.able 1)
Table 1
Percent correllation of
objects interpretation
by lab method
Pfoto- with when on
key air-imag | other flying the
depart- | on land
ment MDP
material
1 46.7 13.4 20.0 20.1
2 39.1 5.5 48.1 7.5
3 60.0 - 22.7 27.9
4 48.1 - 43.4 8.7
Medium | 46.0 4.5 33.5 160 7]
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