ES:
TROPICAL VEGETATION AND CROPS, MILLER 133
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SUMMARY.
This paper reviews the conditions which generally control the procurement of aerial
photographs in the tropics, refers to the effects of high sun altitude and the occurrence
of haze, mentions some experiences in the use of infra-red photography and discusses
the photographic scales suitable for studies of tropical vegetation and crops. The features
which most distinguish tropical vegetation from that of other regions are described from
the photo-interpreter’s point of view, and stress is laid on the prevalence of mixed forest
associations composed of numerous species. Attention is drawn to the discovery of some
interesting vegetation patterns in the tropics as a result of the use of aerial photo-
graphs. The photographic characters of tropical crops and some aids to their recognition
are described. Finally mention is made of the use of aerial photographs in gaining an
understanding of peasant forms of agriculture and in detecting the misuse of land
resources.
The paper will be illustrated at the 1960 World Photogrammetric Congress with
lantern slides prepared from aerial photographs.
RESUME.
Cet article donne un apercu des conditions qui, en général, affectent la production
des photos aériennes dans les pays tropicaux; il relate l'influence de la haute position
solaire et celle de l'atmosphére souvent assez vaporeuse, mentionne quelques expériences
acquises dans l'emploi de la photographie infra-rouge et traite des échelles photographi-
ques dont on peut se servir pour l'étude de la végétation tropicale et des champs cultivés.
Les phénoménes caractéristiques qui distinguent le plus la végétation tropicale de
celle d'autres régions, ont été décrits du point de vue de l'interpréte des photos aériennes,
et il fait ressortir surtout la prépondérance d’une végétation des forêts mixtes, composés
de nombreuses espèces.
L'attention est attirée sur la découverte que dans la végétation tropicale il existe
d’intéressantes formations partout identiques, découverte qui résulte de l’emploi de pho-
tos aériennes.
