ERTS-1 imagery has been successfully used for the identification of large areas of citrus groves and rice fields in the Valencia region of Eastern Spain. Results are encouraging and will facilitate the elaboration of a land use map with a fair degree of definition once methods prove to be fully operational

Desagredo, F. L.

Salinas, F. G.

English

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Paper A -r 
IDENTIFICATION OF LARGE MASSES OF CITRUS FRUIT AND RICE FIELDS 
I N  EASTERN SPAIN 
Fernando Lopez de Sagedo and Francisco G. Salinas, E. T. S. de lngenieros 
Agrchomos, (Universidad Politkcnia de Madrid) 
A BSTRACT 
ERTS-1 imagery has been succeefully used for the identif- 
ication of large areas of citrus groves and rice fields in the 
Valencia region of Eastern Spain. Res-ilts a re  encouraging and wil l  
facilitate the elaboration of a Land Use Map with a fair degree of 
definition once methods prove to be fully operational. 
1. GROUND TRUTH DATA ADQUISITION 
Before receiving ERTS-1 imagery a survey was made eo 
as  to obtain all available aerial photographs of the study zone. In 
the same way meteorological data such ae temperature, rainfall, 
atmospheric pressure, humidity etc. were carefully examinad for 
all stations d the area. A report obout meteorological conditions 
ie ,at present, being produced every day. 
Par t  of the ground truth data about vegetative vigour, bloom- 
ing periode, ripening etc. of the citrus trees a r e  eupplied by the 
Centro Regional de Burjaeot, dependant on the Inetituto Nocioxml de 
Investigacic-ee Agrarias -d the I3otar.y and Photointerpretation Dep- 
a r t m e n t ~  of the Universidad ~oli t6cnica de Valencia. In 8ddition 
three test eitee have been selected a t  Nulee, Sagunto and La 41bu- 
fera in which terrreetrial photographe a re  periodically taken. Theee 
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include black and white pancnromatic, colour, black and white inira- 
red, colour infrared. Collectione of leafe and eoil eamplee a r e  made 
periodically and rubeequently u~alyzed and their epectrograme taken 
in the 450 to 2150 nm. region. 
2. ERTS- 1 IMAGERY HANDLING 
With the arrival  of the ZRTS-1 imagery the following method- 
ology was used :Based on flights USAF-B ( 1957 ) and Citrus Trees 
Census ( 1971 1 all citrus groves and rice fields of model areas  were 
delimitated and their boundaries draw on the National Topographic Map 
scale 1 : 50,000. Reductions were made to different scales ranging 
from 1 : 100,000 to 1 ; 490,000 and they were subsequently compared 
to the enlarged MSS 4 to 7 bands. 
3, RESULTS 
Tonal response for the studied areas  was fdetinctive for either 
citrus trees o r  rice fields. Balds MSS 5 and 7 were more useful 
than either 4 o r  6 which were discarded in a first approach to the 
experiment. 
From the preliminary results a drcft general map woe obtain- 
ed which showed citrus groves o r  r ,e fields areas. This was drawn 
on a ERTS-1 image, scale 1 : 300,000. This map has been urred recent- 
ly in the field so  a s  to asses  the degree of correct identification. 
So fa r  results a r e  encouraging and i t  is expected that they will 
serve a s  an important bad8  for thc elaboration of a Land Uae Map 
that will eupersede the existing one published in 1958. 
Falee colour products have not been used so fa r  but i t  is 
hoped that,in a near hture,  r, three-lantern eystem w i l l  be made op- 
erational thus improving apreciably the a c h ~ a l  results. 


Identification of large masses of citrus fruit and rice fields in eastern Spain

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