Publication Date:
2020-11-26
Description:
In the framework of the national mapping program «CARGNew
Italian Geological Map at 1:50.000 scale», Regione Lombardia is
generating a detailed map (1:10.000 scale) of its territory. Surveying
criteria have been carefully defined in order to produce homogeneous
geological maps: geological survey has been performed at the
1:10.000 scale, and data have been stored in a GIS-oriented database.
The detailed survey scale improved the geological knowledge: the
new maps represent an important tool for territorial planning requirements
of public administrations and engineering geologists (e.g. in
hydrogeological and seismic risk evaluation).
Field geologists performed data input in the geological data
base by alternating field campaigns and data input throughout the
year, taking advantage of periods when field activities are slackened
(i.e. according to climate conditions). In this way, data entry is
nearly synchronous with data collection, and field data become
quickly accessible. Data entry by the field geologists on one side
slows down the field activity, however, it guarantees a precise digitalization
of geometric data and a correct attribute assignment, allowing
to optimize working time.
To allow the data entry to non-GIS-specialized users, we developed
an ArcView®-VisualBasic®-MSAccess® application, enabling the
simultaneous acquisition of geometric and alphanumeric data. Data
base management and cartographic production are performed with
ArcInfo®, through specific procedures which, after data reorganization
and control (both alphanumeric and geometric), lead to the final
cartographic output at different scales.
The 1:10.000 geological database is migrated in the ArcSDE
structure and prepared for data view, query and download
(www.cartografia.regione.lombardia.it/cargweb) using ESRI (ArcIMS)
tools.
From the 1:10.000 geological database we derived the database
for the 1:50.000 CARG maps by both automatic and manual generalization
according to the CARG-APAT standards. During the different
phases of the project, several problems arose, due to both
project organization and data storage system (from data collection
in the field to elaboration and digitalization, and, in case, to final publication).
– Data collection: the survey activity was divided between «bedrock
» and «quaternary» specialists. The double survey provided a
high-quality geological description of the territory, but slowed the
generation of the data-flow. Based on this experience, the last assigned
areas are surveyed by a single geologist, under the supervision
of quaternary and bedrock experts.
– Users feedback: geologists are normally used to draw their
maps on paper; learning how to produce electronic maps can be difficult,
and the software tools have to be studied very carefully and
present user friendly interfaces. Nevertheless, in our experience, a
training period has to be planned, and geologists have to be supported
by a GIS expert, who can understand their needs and modify the
software accordingly.
– System architecture: the ArcView®-VisualBasic®-MSAccess®
(Windows platform) – ArcInfo® (UNIX platform) environment, revealed
problems in the client-server stability of an earlier version; some
unsolved troubles remain, mainly related to the network architecture.
The presence in the CARG-Regione Lombardia crew of consultant
geologists, experienced and trained in collection, analysis and data entry
in the final database, accelerated the critical phases of:
– Data base derivation from Regione Lombardia dataset to CARG-APAT standard.
Description:
Published
Description:
91-96
Description:
N/A or not JCR
Description:
open
Keywords:
Geological Survey
;
Geological Cartography
;
Database
;
GIS
;
CARG
;
04. Solid Earth::04.04. Geology::04.04.11. Instruments and techniques
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
Format:
883199 bytes
Format:
application/pdf
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