COMMISSION VII: INTERPRETATION OF VEGETATION
TABLE 1. CONTRIBUTORS
Mr. H. Axelson Hammarbacken 11 Danderyd, Sweden Mi
Mr. Th. F. Burgers FAO Forest Expert San Salvador, C. America ill
Mr. A. B. Cahusac Conservator of Forests, Forestry Dept. Map Entebbe, Uganda, C. Africa Hi
Section | |
Mr. M. Devred Head of Botanical Div. I. N.E.A.C. Yangambi, Belgian Congo Il
Mr. F. J. M. Frazao Director General of Forestry, Forest Dept. Lisbon, Portugal Il
Mr. P. G. Gallont Subdirector of Cartography, Dept. of Cartog- Guatemala, C. America I!
raphy
Mr. A. J. Grandjean Planning Div., Forest Dept. Utrecht, Netherlands
Mr. L. Herin Director General, Forest Department Leopoldville, Belgian Congo
Mr. F. Heske Director General, Forest Department Addis Ababa, Ethiopia
Mr. G. Hildebrandt University of Freiburg, Forestry Division Freiburg, Germany
Mr. I. de Hulster Chief Conservator of Forests Paramaribo, Dutch Guiana
Dr. K. Kuusela Metsahallitus Helsinki, Finland
Mr. W. von Laer Forstamt Koblenz/Rhein, Germany
Mr. P. C. Lancaster
Mr. E. W. March
Mr. J. W. Mooney
Mr. R. G. Miller
Mr. I. Nakajima
Director of Forest Research
Chief Conservator of Forests
Sylviculturist Forestry Dept.
Forestry & Land Use Section
Directorate of Overseas Surveys
Forest Experiment Station
[badan, Nigeria
Enugu, Nigeria
Kumasi, Ghana
Tolworth Surbiton, Surrey
England
Megro, Tokyo, Japan
> - -
Dr. A. Nyyisonen University of Helsinki
Mr. P. Paelinck Forest Department
Mr. H. Reichardt Forestry Division, FAO,
Mr. B. Rollet FAO Forest Expert
Helsinki, Finland
Leopoldville, Belgian Congo
Rome, Italy
Phnom-Peuh, Cambodia
Mr. T. S. Serevo Asst. Director of Forestry, Bureau of Forestry Manila, Philippines
Mr. Ch. Sirivarna Director-General of Forestry
Mr. J. H. G. Smith University of Br. Columbia
Bangkok, Thailand
Vancouver, Canada
Delft, The Netherlands
Mr. Z. Tomasegovié University of Zagreb, Forestry Division Zagreb, Yugoslavia
Mr. J. P. Veillon University of the Andes, Forestry Div. Merida, Venezuela
Mr. R. Viney University of Nancy, Forest Division Nancy, France
Mr. R. C. Wilson Forest Survey Branch, US Dept. of Agriculture Washington, D.C., USA
\
|
]
\
]
|
Mr. D. A. Stellingwerf Intern. Training Centre
\
\
\
\
|
Mr. M. G. Yearsly Late Forestry Department
timal results for interpretation. The total
number of flying days during the 3 seasons
was 52.
The aerial photographs were used by the
surveyors to assist in their forest inventory,
which was mainly done in the field. For that
purpose the aerial photographs were first
studied in the office and differences in the
stand composition were indicated on the
photographs. The annotated photographs
were afterwards checked in the field, and at
the same time the data necessary for an esti-
mate of the timber volume were obtained by
terrestrial methods. Whereas formerly with-
out aerial photographs one surveyor was able
to survey a forest area of 400-500 ha in one
month, it was found that with aerial photo-
graphs this production could be increased to
900 and 1,000 ha per month, and under
favourable conditions production even up to
1,200 ha.
This improvement was mainly because the
time-consuming terrestrial measurements of
stand boundaries under prevailing moun-
tainous conditions could be avoided, as these
Ghana
lines could be mapped from the aerial photo-
graphs. The use of photographs enabled the
forest inventory of 6595 of the whole country
to be completed in a period of 4 years, from
1952 till 1956, a result which could never have
been achieved with the available forestry
staff without aerial photographs. The extra
expense due to the photography was therefore
justified and totally compensated by savings
in time.
The results obtained in the field were
mapped on 1:10,000 scale which proved ac-
ceptable. For mapping, various instruments
were used, ranging from simple plotting in-
struments, such as the Stereocomparator and
the Vertical Sketchmaster, to the more com-
plicated Multiplex and Wild A6 and A8. The
last group of instruments was particularly
necessary for the mountainous regions. No
special research was carried out to obtain ad-
ditional information on the photographic
requirements necessary for better interpreta-
tion, such as special film-filter combinations,
best season of the year to make exposures
and the most suitable photographic scale.
|
|
|
|
|
cette ttes
