Difference between revisions of "Great Lakes Bathymetry"

Revision as of 14:27, 8 June 2017

Process of creating a 3D map of the area

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

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

Try this map with these instructions
For OSM information, use Geofabrik.de and reformat if necessary as described here^[3]

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.
Create STL (Raster -> DEMto3D)

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...

↑ Stack Exchange answer here
↑ Geographic Information Systems Stack Exchange. "QGIS choose contour line labels." Here
↑ Geographic Information Systems Stack Exchange. "Load .osm.pbf file in Qgis." here.

@@ Line 25: / Line 25: @@
 {{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}}
-==Workflow Take 2==
+===Workflow Take 2===
 * Try [http://apdrc.soest.hawaii.edu/las8/UI.vm#panelHeaderHidden=false;differences=false;autoContour=false;globalMin=-237;globalMax=1667;xCATID=C1354ADCD9A2E42563E67810557FE547;xDSID=etopo1;varid=b_bathy-etopo1;imageSize=auto;over=xy;compute=Nonetoken;catid=C1354ADCD9A2E42563E67810557FE547;dsid=etopo1;varid=b_bathy-etopo1;avarcount=0;xlo=-92.788119178879;xhi=-69.93315874592;ylo=41.247106546728;yhi=49.388349427462;operation_id=Plot_2D_XY_zoom;view=xy;ferret_image_format=gif;ferret_use_graticules=none;ferret_margins=false;ferret_deg_min_sec=false;ferret_contour_style=color_filled_plus_lines;ferret_contour_levels=20 this] map with [http://www.instructables.com/id/Lasercut-Bathymetric-Map-of-Arabian-Sea/ these] instructions
 * 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>