1. WPS 4 ODV: on-the-fly server-side plotting of data (in Google Earth)
EMODNet chemistry contribution, Barcelona, Mar 2014
Gerben J. de Boer, Gerrit Hendriksen, Giorgio Santinelli
14 oktober 2019

2. OpenEarthTools Google Earth static products
14 oktober 2019

3. Matlab oceandataview and googleplot
14 oktober 2019

4. OpenEarth Matlab GooglePlot

5. *.png *.kml *.nc collection *.odv collection Portal links
Linkable static collection of png files per granule
(made by ODV?)
Linkable static collection of kml files per granule
(python or Matlab
Linkable DYNAMIC collection of kml files per granule
(python)
pyWPS
pyWPS
*.png
*.kml
ODV batch mode
OpenEarth Matlab GooglePlot 13,000 lines
> KMLpcolor() wrapper for Simplekml.py
> Matplotlib back-end for Simplekml.py
Cache of netCDF files incl. resolved P011, P061 and EDMO codes as NOAA/MyOcean THREDDS OPeNDAP)
Cache in RDBMS (PostgreSQL, PostGIS or Oracle if someone pays the license)
*.nc
collection
SQL/WFS/ SOS/ OPENDAP
Data only, product done bij GHER, Liege
*.odv
collection
Robo-harvested cache of ODV files
ODV files at EDMO sources
P0x
EDMx

6. pyWPS
MSc thesis finished this summer under National GIS MSc program tor testing

7. Processing 1 ODV fle http://localhost/cgi-bin/pywps.cgi? &service=wps
&version=1.0.0
&request=Execute
&Identifier=odvProcess
&DataInputs=[
url=d:/../userkc30e50-data_centre _result/…
world_N50W10N40E0_ _ txt;
parameter=Wind_direction%28dd%29_[deg] ]
14 oktober 2019

8. WPS output xml with link to kmz
kml is inefficient xml so needs zipping for faster delivery
kmz is zip file renamed kmz with the kml inside it.
a kmz can include more, like the scattered dot png
14 oktober 2019

9. kmz can be opened in Google Earth
Value is mapped in a grey scale colormap
14 oktober 2019

10. Data value lights up as text upon mouse hoover-over
14 oktober 2019

11. Data and meta-data is stored as html table inside kmz
14 oktober 2019

12. Time of each data encoded as kml time: time slider to select period
14 oktober 2019

13. WPS output xml with json inside it
Java Script Object Notation
json is an efficient ascii stream
many libraries can easily parse json, especially java script as used in websites
webviewer can render table or plot
14 oktober 2019

14. Also for directory with ODV files
but a bit slow, ODV has some performance issues for large folders
&service=wps
&version=1.0.0
&request=Execute
&Identifier=odvProcess
&DataInputs=[
url=d:/../userkc30e50-data_centre _result;
parameter=Wind_direction%28dd%29_[deg] ]
14 oktober 2019

15. SDN integration issues
Speed-up getting the data: needed for on-the-fly
ODV cache
Matlab toolbox
Python pyODV: quick ‘n dirty parser (scaffolded: no P01)
API:
API: ODV collections
PostgreSQL/Oracle cache (python has mature SQL library)
netCDF collection cache (python has mature netcdf library)
How to request plot for one variable:
How do you know what’s in a file? Meta-data is too aggregated.
2-step query like SOS?
Where to host test WPS server?
Test dataset cache 4 Deltares server?
14 oktober 2019

16. PyWPS ODV code in open access repos
14 oktober 2019

17. WPS inputs: ideas? WPS input Colormap choice Colorlimits
Outputformat: kmz, json, png, …
Flag for pop-up table (slow for large datasets)
Plot options:
Trajectory: connect dots with lines
Timeseries: dynamic plot
Profiles: plot as column with z exaggeration
14 oktober 2019