How to visualize and animate (geophysical) models. Show raw data

Also see other articles in the series "How to visualize and animate (geophysical) models":

• Introductory article listing software used
• Show raw data
• 3D animation and visualization of 4D data
• Informativeness of visualization
• Voxel models and mesh surfaces

Depending on the project and the scale of the data, we can choose different visualization options - and yet, for any data scale, it is important to allow us to visually evaluate this scale. For example, at the regional level, displaying on an Earth globe will make it easy to understand both the scale and location of the study area. So we will deal with the display of data on the globe.

From left to right: EMAG2 Earth Magnetic Anomaly, Sandwell and Smith Free Air Gravity Grid, GEBCO Gridded Bathymetry Data.

Formulation of the problem

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, (, ). () . " " — ParaView , .

( ) NetCDF. GDAL ( ):

gdal_translate -of NetCDF -r average -tr .25 0.25 EMAG2_V2.tif EMAG2_V2.15min.nc
gdal_translate -of NetCDF -r average -tr .25 0.25 grav_28.1.nc grav_28.1.15min.nc
gdal_translate -of NetCDF -r average -tr .25 0.25 GEBCO_2019.nc GEBCO_2019.15min.nc 

Planet texture maps web site, 8081_earthmap4k.jpg:

ParaView ImageMagick:

convert -flip -crop 50%x100% 8081_earthmap4k.jpg _converted.png
convert _converted-1.png _converted-0.png +append 8081_earthmap4k.fixed.jpg

, ParaView.

ParaView

NetCDF ParaView, "Spherical Coordinates" ( , NetCDF , , ) "Calculator"

( 1 + (elevation/6370000)*40)*(cos(coordsY/180*3.141592) * cos(coordsX/180*3.141592) * iHat + cos(coordsY/180*3.141592) * sin(coordsX/180*3.141592) * jHat + sin(coordsY/180*3.141592) * kHat)

"6370000" ( , ), "40" . , "Coordinate Results" (elevation). GEBCO 2019 Gridded Bathymetry Data :

, "TextureMaptoSphere" "Texture" 8081_earthmap4k.fixed.jpg:

( ), , :

, . — , !

, :

, .

Download the global GEBCO_2019 Grid in netCDF format (11 Gbytes, 12 Gbytes uncompressed) — The GEBCO_2019 Grid is the latest global bathymetric product released by the General Bathymetric Chart of the Oceans (GEBCO) and has been developed through the Nippon Foundation-GEBCO Seabed 2030 Project.

WGM2012 Earth's Gravity Anomalies (2-arc-minute resolution) — WGM2012 is the first release of a high resolution grids and maps of the Earth's gravity anomalies (Bouguer, isostatic and surface free-air), computed at global scale in spherical geometry.

EMAG2: Earth Magnetic Anomaly Grid (2-arc-minute resolution) — Magnetic anomaly maps provide insight into the subsurface structure and composition of the Earth's crust. Anomalies trending parallel to the isochrons (lines of equal age) in the oceans reveal the temporal evolution of oceanic crust.

Planet texture maps web site

GDAL - GDAL is a translator library for raster and vector geospatial data formats that is released under an X / MIT style Open Source License by the Open Source Geospatial Foundation .

ImageMagick - ImageMagick is free software delivered as a ready-to-run binary distribution or as source code that you may use, copy, modify, and distribute in both open and proprietary applications.

HOWTO: Visualization on The Globe is a more technical article in English on LinkedIn.