Author(s)

R. Leonard, C. Rafanelli & T. Montefmale

Abstract

The meteorological data recording (rain, temperature, pressure and so on) using mechanical recorders occurs drawing the trend, trace, on a graduated paper by a pen-nib linked to instrument transducer. Manual techniques or hand-digitiser readings to reduce those traces are used. The vast amount of work to reduce a lot of pluviograms with high precision becomes prohibitive. This paper shows a software, written in 'C' and running under Extended DOS, for fully automatic reading of scanner digitised pluviograms. So that it is possible to recover the large papery archives existing in many organisations and institutions. The pluviogram digitised in a graphic file is submitted to a series of elaborations concerning image-enhancement, geometric transformation, scaling and filtering of the background, to clear the graduated sca

Keywords