Modelo de procedência para auxiliar na análise da qualidade do dado geográfico
Resumo
The quality of the geographic data must be a relevant concern for providers and consumers of this
type of data because the manipulation and analysis of low quality geographic data may result in
errors, which will be propagated through the consequent data. Thus it is important to properly
document the information which allows for certifying the quality of the geographic data. In order
to provide a minimum amount of metadata for such purpose, this dissertation presents an approach
based on the provenance of the geographic data, which corresponds to the information about the
history of such data from its origin until the processes that resulted in its current state. For this
purpose, a provenance model called ProcGeo was proposed, in which it was defined a minimum
amount of metadata that must be considered for the analysis of the quality of a certain geographic
data. Although a few works and geographic metadata standards, such as Federal Geographic Data
Committee (FGDC) and ISO 19115, consider the information about the provenance in the analysis
of the quality of geographic data, it´s the opinion of the author that some metadata considered
important for this purpose are not adequately contemplated. In this work, the prototype of an
interface called ProcGeoInter was also implemented, aiming to guarantee the completeness and
correctness in the filling out of the defined metadata in the ProcGeo model as well as the
visualization of their content. The validation of the ProcGeo model and of the ProcGeoInter
interface were made through tests and surveys applied to providers and consumers of geographic
data. As a means of comparison, the interface for filling out and visualization of metadata
available by SIG Quantum GIS (plugin Metatools) was used, which implements the FGDC
geographic metadata standard. The obtained results indicated that the metadata defined in the
ProcGeo model helped the geographic data provider in the description of the provenance of such
data, when compared to those defined in the FGDC geographic metadata standard. Through the
consumer´s focus it was possible to notice that the information filled out in the metadata defined
by the ProcGeo favored the analysis of the quality of the consumed data. It was clear that both
providers and consumers do not possess the habit of providing or consuming the information
predicted in the FGDC and ISO 19115 geographic metadata standards.