Great Lakes Bathymetry
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Revision as of 18:15, 8 June 2017 by JStallings (talk | contribs)
Ideas
Process of creating a 3D map of the area
Resources
- Downloadable Great Lakes bathymetric maps from NOAA
- Further information from the Great Lakes Information Network
- The National Map combines many of the above resources
- The USGS Earth Explorer is easier to use than the above, but requires a login and download client
CNC Carve
Workflow
- Download shapefiles from Natural Earth or other files from NOAA. Superior bathymetry with lower (resolution?) is available here, with login
- Download and install QGIS and Inkscape[1]
- Open with QGIS Desktop, realize the data is only for oceans...
- Download bathymetry information from each lake from NOAA here
- No need to extract files, open each in QGIS Desktop
- Add OpenStreetMap information (not working at this time, probably missed a step)
- Right-click shapefile in left layers panel, select Properties
- Choose Filter, then create expression, e.g. "DEPTH" IN ('0', '1', '25', '50', '60')[2]
It is helpful to use the Values box (make sure "Use unfiltered layer" is checked if changing an applied filter) to see the extent of the map
Workflow Take 2
- Try this map with these instructions
- For OSM information, use Geofabrik.de and reformat if necessary as described here[3]
3D Print
- Download ArcGrid DEM from USGS National Map or Earth Explorer (3DEP, 1/3 arc-second DEM)
- Unzip file
- Open QGIS, add Vector, add layer file (.adf)
- Select extent (Raster -> Extraction -> Clipper)
- Save as GeoTIFF
- Add GeoTIFF to model
- Analyze to DEM (Raster -> Analysis -> DEM [Terrain Models])This step creates an apparently inaccurate model (top). Using 3DEM creates a more accurate representation, but the extent was smaller on the second.
- If necessary, merge the DEMs
- Create STL (Raster -> DEMto3D)[4]
Other Sources
- Earth satellite imagery from USGS, esp. those over time
- ArcGIS contour map of the Great Lakes
- Live Access Servers hosted by NOAA/PMEL/TMAP provide information on air quality, ocean salinity, temperature, etc.
- LIDAR resources in case we want to machine it. I want to machine it.
- BBBike.org pulls from OSM, but extent is much too small.
- Using plywood (though very heavy) with the proper scale would approximate the contour lines of a topo map...
- Mosaicing and clipping rasters
- OceansMap, a well-aggregated set of realtime data about major bodies of water around the world, including the Great Lakes region
- Historical maps from the Army Corps of Engineers
- Portal for Great Lakes Observing System information from the Integrated Ocean Observing system