Difference between revisions of "Great Lakes Bathymetry"
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* [http://www.naturalearthdata.com/downloads/ Natural Earth] provides shapefiles for cultural and physical elements | * [http://www.naturalearthdata.com/downloads/ Natural Earth] provides shapefiles for cultural and physical elements | ||
== | ==Laser Cut, Low Resolution== | ||
===Workflow=== | ===Workflow=== | ||
# Download shapefiles from [https://www.ngdc.noaa.gov/mgg/greatlakes/greatlakes.html NOAA]. Superior bathymetry contours with unclear provenance is available [https://databasin.org/datasets/88d305616c3e44cabbd465dde0d916c7 here], with login | # Download shapefiles from [https://www.ngdc.noaa.gov/mgg/greatlakes/greatlakes.html NOAA]. Superior bathymetry contours with unclear provenance is available [https://databasin.org/datasets/88d305616c3e44cabbd465dde0d916c7 here], with login | ||
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# Choose Filter, then create expression, e.g. "DEPTH" IN ('0', '1', '25', '50', '60')<ref>Geographic Information Systems Stack Exchange. "QGIS choose contour line labels." [https://gis.stackexchange.com/questions/121585/qgis-choose-contour-line-labels Here]</ref> | # Choose Filter, then create expression, e.g. "DEPTH" IN ('0', '1', '25', '50', '60')<ref>Geographic Information Systems Stack Exchange. "QGIS choose contour line labels." [https://gis.stackexchange.com/questions/121585/qgis-choose-contour-line-labels Here]</ref> | ||
{{note|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's values}} | {{note|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's values}} | ||
==Create STL for CNC Router or 3D Printer== | ==Create STL for CNC Router or 3D Printer== | ||
Revision as of 09:46, 10 June 2017
Ideas
Process of creating a 3D map of the area
Resources
- Downloadable Great Lakes bathymetric maps from NOAA
- All bathymetric maps from NOAA
- The USGS Earth Explorer is easier to use than the above, but requires a login and download client
- Natural Earth provides shapefiles for cultural and physical elements
Laser Cut, Low Resolution
Workflow
- Download shapefiles from NOAA. Superior bathymetry contours with unclear provenance is available here, with login
- Download and install QGIS and Inkscape[1]
- No need to extract files, open each in QGIS Desktop
- Add OpenStreetMap information if desired (the native support is not working at this time[2], but the plugin does)
- Right-click shapefile in left layers panel, select Properties
- Choose Filter, then create expression, e.g. "DEPTH" IN ('0', '1', '25', '50', '60')[3]
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's values
Create STL for CNC Router or 3D Printer
- 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])A balance must be made between extent and resolution. 1:50,000 creates excellent models, but cannot contain an entire lake. Above that and the file crashes my system. A further note on resolution.
- If necessary, merge the DEMs
- Solution to bathymetric (negative) altitude values[4]: using Raster Calculator, add bottom value to all height values
- Create STL (Raster -> DEMto3D)[5]
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
- The National Map combines many of the above resources
References
- ↑ Stack Exchange answer here
- ↑ "OpenStreetMap in QGIS." OpenStreetMap Wiki. here.
- ↑ Geographic Information Systems Stack Exchange. "QGIS choose contour line labels." Here
- ↑ Geographic Information Systems Stack Exchange. "Mars DTM has all negative elevations in QGIS. Can't build STL file for 3D print." here.
- ↑ Modified from Laguna Tools. "Max CNC Tutorial 3D Landscape." YouTube. here.