Difference between revisions of "Great Lakes Bathymetry"
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* For OSM information, use [http://download.geofabrik.de/north-america.html Geofabrik.de] and reformat if necessary as described [https://gis.stackexchange.com/questions/39112/load-osm-pbf-file-in-qgis here]<ref>Geographic Information Systems Stack Exchange. "Load .osm.pbf file in Qgis." [https://gis.stackexchange.com/questions/39112/load-osm-pbf-file-in-qgis here].</ref> | * For OSM information, use [http://download.geofabrik.de/north-america.html Geofabrik.de] and reformat if necessary as described [https://gis.stackexchange.com/questions/39112/load-osm-pbf-file-in-qgis here]<ref>Geographic Information Systems Stack Exchange. "Load .osm.pbf file in Qgis." [https://gis.stackexchange.com/questions/39112/load-osm-pbf-file-in-qgis here].</ref> | ||
==3D | ==Create STL for CNC Router or 3D Printer== | ||
# Download ArcGrid DEM from USGS [https://viewer.nationalmap.gov/basic/#productSearch National Map] or [https://earthexplorer.usgs.gov/ Earth Explorer] (3DEP, 1/3 arc-second DEM) | # Download ArcGrid DEM from USGS [https://viewer.nationalmap.gov/basic/#productSearch National Map] or [https://earthexplorer.usgs.gov/ Earth Explorer] (3DEP, 1/3 arc-second DEM) | ||
# Unzip file | # Unzip file | ||
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# Save as GeoTIFF | # Save as GeoTIFF | ||
# Add GeoTIFF to model | # Add GeoTIFF to model | ||
# Analyze to DEM (Raster -> Analysis -> DEM [Terrain Models]){{note| | # Analyze to DEM (Raster -> Analysis -> DEM [Terrain Models]){{note|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 [https://blogs.esri.com/esri/arcgis/2010/12/12/on-map-scale-and-raster-resolution/ note] on resolution.[[File:Erie2bumps.png|thumb|left]][[File:Eriesmooth.png|thumb|left]]}} | ||
#* If necessary, [http://www.qgistutorials.com/en/docs/raster_mosaicing_and_clipping.html merge the DEMs] | #* If necessary, [http://www.qgistutorials.com/en/docs/raster_mosaicing_and_clipping.html merge the DEMs] | ||
#* Solution to bathymetric (negative) altitude values<ref>Geographic Information Systems Stack Exchange. "Mars DTM has all negative elevations in QGIS. Can't build STL file for 3D print." [https://gis.stackexchange.com/questions/217203/mars-dtm-has-all-negative-elevations-in-qgis-cant-build-stl-file-for-3d-print here].</ref>: using Raster Calculator, add bottom value to all height values | #* Solution to bathymetric (negative) altitude values<ref>Geographic Information Systems Stack Exchange. "Mars DTM has all negative elevations in QGIS. Can't build STL file for 3D print." [https://gis.stackexchange.com/questions/217203/mars-dtm-has-all-negative-elevations-in-qgis-cant-build-stl-file-for-3d-print here].</ref>: using Raster Calculator, add bottom value to all height values | ||
# Create STL (Raster -> DEMto3D)<ref>Modified from Laguna Tools. "Max CNC Tutorial 3D Landscape." ''YouTube''. [https://www.youtube.com/watch?v=Ef6f6dwQbCc here].</ref> | # Create STL (Raster -> DEMto3D)<ref>Modified from Laguna Tools. "Max CNC Tutorial 3D Landscape." ''YouTube''. [https://www.youtube.com/watch?v=Ef6f6dwQbCc here].</ref> | ||
==Other Sources== | ==Other Sources== | ||
Revision as of 08:54, 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
CNC Carve
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
Workflow Take 2
- Try this map with these instructions
- For OSM information, use Geofabrik.de and reformat if necessary as described here[4]
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[5]: using Raster Calculator, add bottom value to all height values
- Create STL (Raster -> DEMto3D)[6]
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. "Load .osm.pbf file in Qgis." 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.