Hydrography update and study of the permanent preservation areas from a remote sensing of high spatial resolution

Author(s)

Piroli, Edson Luis ; Zanata, Juliana Marina

• Document type: Journal article
• Source: APPLIED RESEARCH & AGROTECHNOLOGY; v. 7, n. 1, p. 10-pg., 2014-01-01.

Abstract

The Permanent Preservation Areas (PPA) has been the center of debates regarding the proposed changes in the Brazilian Forest Code (Law 4.771/65). These are important for the protection of water bodies and other natural resources. However, its dimensions have been discussed due to possible impacts on the socioeconomics activities. Because of this importance, its determination and representation depends on actual and precise data base. The aim of this study was to assess the representation of the available hydrography on the topographic maps on the scales of 1: 50000 and 1: 250000, provided by the IBGE, comparing it with the one identified by the images of the PRISM sensor (Panchromatic Remote-sensing for Stereo Mapping), installed in the Japanese satellite ALOS (Advanced Land Observing Satellite). The study was developed from the edition of vectors and generation of buffers from the PPA, using geographic information systems. It was found an important discrepancy between the number of river sources and streams represented on the topographic maps of the studied area and the one identified by using the images of the sensor, which implicates in the PPA dimensions. It was also verified that the images used in the present study allowed adequate identification of the PPA limits, as well as of its usage and occupation. (AU)