GVII-32 
PHOTOGRAMMETRIC ENGINEERING 
tried old Swedish timber cruisings on the ground. However, in general the ac 
tivity and progress since 1952 are important, as can be seen from following 
examples: 
The Board of Crown Lands and Forests has decided that (vertical) aerial 
photographs shall be used as the basis of forest mapping in North Sweden, where 
the mapping area amounts to about 40,000 km. 2 (c. 10 million acres). Last year 
only 1,250 km. 2 state forests were mapped, but 3,900 km. 2 were photographed for 
mapping in 1956. An increasing part of the mapping work is done indoors and 
checked in the field, to some extent from aircraft. Helicopters have been used 
for 50 hours for checking the stand boundaries, drawn on the photographs, and 
at the same time for description of the stands. However, transferring the details 
from photographs with a scale of c. 1:25,000 to ordinary drawn maps with a 
scale of 1:10,000 (in Lapland 1:20,000) by using plotted bench marks, demands 
more adequate instruments than are now available. A great deal of attention 
is paid to training in photo interpretation, and according to a plan forest 
officers of all grades attend five day courses of instruction. The Board also has 
brought forward the project for photographing all Sweden every 10 years. 
FOREST SURVEY PHOTO TECHNIQUES INVADE NEW AREAS 
The first significant forest photo interpretation in China was in 1954. Photo 
interpretation was used in the land use and forest resource survey project of 
Taiwan. The objective of this project was to yield (1) an inventory of forest re 
sources including current volume, growth, drain and other data needed to for 
mulate forest management plans directed toward maximizing a continuous 
harvest of indigeneous forest products; (2) A vegetational cover map to facili 
tate the classification of land according to present use and soil and water con 
servation problem areas, as a first step in formulating a program of land use 
readjustment. 
The result of this survey led to the organization of the Chinese Society of 
Photogrammetry. On December 26, 1955 this Society held its second annual 
meeting. The displays, under preparation for several weeks, were viewed for 
four days. More than 500 people attended this meeting. Folks showed tremen 
dous interest; many people attended the meeting twice and studied exhibits at 
great length. Groups of students and teachers took many notes and were loaded 
with questions. As a part of this meeting a United Technical Conference was 
held which was attended by 30 government agencies, 10 societies and 8 schools. 
This conference discussed problems related to the use of aerial photos in the 
economic development of Taiwan and was divided into three parts. The first 
presented seven aerial survey projects. The second discussed problems raised by 
specialists in various fields. The third part was the exhibits. This Society now 
has a periodical called Photogrammetry Notes with 4 issues a year, each with 9 
technical papers. 
England reports that a land classification overlay for a photo-mosaic of a 
proposed sisal plantation on the Kenya coast was prepared by photographic 
interpretation methods, with minimum ground checking, and provided the 
necessary basis for locating rocky areas, eight natural vegetation units, shifting 
African cultivation and land in the process of regeneration, as well as a means of 
selecting sample sites in areas representative of uniform vegetation classes. 
In Britain land-use mosaics at a scale of 1:10,560 have been prepared, al 
though in this case the interpretation is restricted to the identification of such 
categories of agricultural utilization as grass, crops, root crops, woodland and 
orchard.