u SO 
a 
AN APPLICATION OF LANDSAT DATA IN FOREST TIMBER 
VOLUME ESTIMATION 
by 
SHOU-ZHENG TANG 
and 
GUAN-HUA XU 
CHINESE ACADEMY OF FORESTRY 
WAN SHOU SHAN PEKING, CHINA 
his paner leals with the possibility of applying 
Landes data in the estimation of forest timber vo- 
lumes. 
The EPDCS system was used for MSS data processing. 
The seore model, a new ouantization method in which 
interactions are considered, was adopted in such a 
way as to make possible the use of MSS data and some 
grouni tru data. 
The nrocadures followed are lis;ed 5elow: 
1. EL lero 3x*5730591 aocoriing to 
folest co3708 : 377 +, deciduous and mixed 
stands) and age has (youne, middle-aged and old 
gtands). The timber volume in each training sample 
vas measured out. 
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es (L 
2. The study area Was oelissifiod i390 2 sot of 
QlasdoS, jqnieh vere uec .t£ items of score model, 
according to forest comoosition sn3 age class ces2s0- 
tively, iziaz ^ae supervised classification method. 
3. The:study area was also classified into other 
sets of classes, which were used as i5ens o? score 
model, using two different unsupervised eolassi?.oa- 
bion ne n8. 
4. The score of the items and shoir interactions 
as  letermiaed by means of the score model ani 
suitable itens and interactions were selected ^y 
statistie:! tests. 
5. A tinber volume table ‘vas constructed. ‘he 
timber volume corrésponding to each pixel was 3eter- 
nined by the tabls. Then the total volume in tae 
whole =stuly area 7.3 obtained. 
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