Difference between revisions of "Great Lakes Bathymetry"
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==Workflow== | ==Workflow== | ||
# Download shapefiles from [http://www.naturalearthdata.com/downloads/ Natural Earth] or other files from [http://www.charts.noaa.gov/InteractiveCatalog/nrnc.shtml?rnc=14500 NOAA] | # Download shapefiles from [http://www.naturalearthdata.com/downloads/ Natural Earth] or other files from [http://www.charts.noaa.gov/InteractiveCatalog/nrnc.shtml?rnc=14500 NOAA]. Superior bathymetry with lower (resolution?) is available [https://databasin.org/datasets/88d305616c3e44cabbd465dde0d916c7 here], with login | ||
# Download and install [http://www.qgis.org/en/site/ QGIS] and [https://inkscape.org/en/download/ Inkscape]<ref>Stack Exchange answer [https://gis.stackexchange.com/questions/51980/how-to-convert-shapefile-to-vector-emf here]</ref> | # Download and install [http://www.qgis.org/en/site/ QGIS] and [https://inkscape.org/en/download/ Inkscape]<ref>Stack Exchange answer [https://gis.stackexchange.com/questions/51980/how-to-convert-shapefile-to-vector-emf here]</ref> | ||
# Open with QGIS Desktop, realize the data is only for oceans... | # Open with QGIS Desktop, realize the data is only for oceans... | ||
# Download bathymetry information from each lake from NOAA [https://www.ngdc.noaa.gov/mgg/greatlakes/greatlakes.html here] | # Download bathymetry information from each lake from NOAA [https://www.ngdc.noaa.gov/mgg/greatlakes/greatlakes.html here] | ||
# No need to extract files, open each in QGIS Desktop | # 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')<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}} | |||
==Other Sources== | ==Other Sources== | ||
Revision as of 16:58, 7 June 2017
Ideas
Process of creating a 3D map of the area
Resources
- 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
- Downloadable Great Lakes bathymetric maps from NOAA
- Google maps
- 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
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
Other Sources
- Earth satellite imagery from USGS, esp. those over time