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the best available processing steps (McGuire et al.
2009
) the processing algorithms
for CRISM data are still in development, especially noise reduction (e.g. Parente
et al.
2014
) and atmospheric correction (e.g. Dobrea et al.
2011
; Wiseman et al.
2012
). PlanetServer will therefore either need to be updated once new corrections
have been made available. The feasibility of performing on-the-
fl
y additional
corrections, possibly using WCPS, needs to be investigated.
Limited online collaboration among the participating researchers of the Case
Study was achieved by using the wiki system. Results could be discussed and
ArcGIS screenshots could be uploaded and added as
figures. A true collaborative
webGIS system for Mars data however does not yet exist. The missing functionality
might be similar to that of the Concurrent Online WebGIS (Ottens and van Tilburg
2013
), described as
and allowing for multiple users to
digitize a map in real-time. Timing and technological developments are probably
right for such type of collaborative mapping/analysis to emerge and develop in
coming years.
'
google docs for maps
'
5 Conclusions
The use of the Jacobs University HPC facilities allowed for relatively fast pro-
cessing of image mosaic data. The mosaicking process for the entire
2,000 tiles
of a global CTX mosaic therefore comes into reach, but would still take a con-
siderable amount of time and computing resources. The work could, however, be
collectively shared among fellow scientists and institutes (e.g. a form of limited
crowdsourcing), where each group or individual would manage one or more CTX
tiles. This will possibly be attempted with our close colleagues from cooperating
institutes.
Within the Case Study the processed CTX and CRISM data of Noachis Terra
have been made available online. A custom-built web client and ArcGIS add-in
allow for access to, and analysis of, this data. The data was collaboratively shared
among researchers at different locations to investigate the Noachis Terra geology
and mineralogy. A wiki system was used to share and discuss results. Collaborative
mapping, such as that of the Concurrent Online WebGIS (Ottens and van Tilburg
2013
), would possibly allow for future integration. The PlanetServer Neo web client
is envisioned to evolve into such a system. However for the time being mapping
remains best performed using of
*
ine GIS software such as ArcGIS. The Planet-
Server add-in tool adds online access to processed CRISM data, and is therefore
foreseen to mature into an advanced spectral analysis tool.
In summary the Case Study showed that the infrastructure allowing for collab-
orative exploration and analysis of Mars Big Data is advancing but more work is
needed towards integration. This might lead to a collaborative webGIS and wiki
system enabling the online collaborative analysis, mapping, documentation and
discussion of Mars Big Data in order to unravel the complex geological history of
Mars.
fl
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