Orthophotography And Its Applications In The Recording Of Buildings

Abstract

Rencana ini menyentuh berkenaan dengan teknik orthofoto di dalam kerja-kerja merekod bangunan.Pertamanya, tumpuan diberi kepada konsep orthofotografi di mana prinsip rektifikasi "differential" dihuraikan. Bahagian kedua membincangkan selisih-selisih yang terdapat di dalam proses orthofotografi yang memberi kesan kepada ketepatan dan juga kualiti gambar orthofoto tersebut. Di antara selisih-selisih tersebut, selisih sistem mempunyai kesan yang terbesar kepada ketepatan dan kualiti gambar orthofoto dan diikuti oleh selisih "scanning." Akhir sekali, penulis mengemukakan beberapa perkara yang diperhatikannya dalam kajian yang dibuat ke alas empat jenis permukaan bangunan. This paper deals with the orthophoto technique of recording buildings. Firstly, it focuses on the concept of orthophotography where the principles of differential rectification are described. Secondly, the errors inherent in the orthophotographic process which would affect the accuracy and pictorial quality of the final product, that is, the orthophoto itself are discussed. Among the errors, system errors followed by scanning errors have the major effect on the accuracy and pictorial quality. Finally, the writer presents his observations from the studies carried out on four different types of building surfaces.