AUTOMATIC RIVER NETWORK EXTRACTION FROM LIDAR DATA
National Geographic Institute of Spain (IGN-ES) has launched a new production system for automatic river network extraction for the Geospatial Reference Information (GRI) within hydrography theme. The goal is to get an accurate and updated river network, automatically extracted as possible. For th...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2016-06-01
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| Series: | The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences |
| Online Access: | https://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XLI-B8/365/2016/isprs-archives-XLI-B8-365-2016.pdf |
| Summary: | National Geographic Institute of Spain (IGN-ES) has launched a new production system for automatic river network extraction for
the Geospatial Reference Information (GRI) within hydrography theme. The goal is to get an accurate and updated river network,
automatically extracted as possible. For this, IGN-ES has full LiDAR coverage for the whole Spanish territory with a density of 0.5
points per square meter. To implement this work, it has been validated the technical feasibility, developed a methodology to
automate each production phase: hydrological terrain models generation with 2 meter grid size and river network extraction
combining hydrographic criteria (topographic network) and hydrological criteria (flow accumulation river network), and finally the
production was launched. The key points of this work has been managing a big data environment, more than 160,000 Lidar data
files, the infrastructure to store (up to 40 Tb between results and intermediate files), and process; using local virtualization and the
Amazon Web Service (AWS), which allowed to obtain this automatic production within 6 months, it also has been important the
software stability (TerraScan-TerraSolid, GlobalMapper-Blue Marble , FME-Safe, ArcGIS-Esri) and finally, the human resources
managing. The results of this production has been an accurate automatic river network extraction for the whole country with a
significant improvement for the altimetric component of the 3D linear vector.
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This article presents the technical feasibility, the production methodology, the automatic river network extraction production and its
advantages over traditional vector extraction systems. |
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| ISSN: | 1682-1750 2194-9034 |