A Web Map Service implementation for the visualization of
multidimensional gridded environmental data
We describe ncWMS, an implementation of the Open Geospatial Consortium’s Web Map Service (WMS)
specification for multidimensional gridded environmental data. ncWMS can read data in a large number
of common scientific data formats e notably the NetCDF format with the Climate and Forecast conventions
e then efficiently generate map imagery in thousands of different coordinate reference systems.
It is designed to require minimal configuration from the system administrator and, when used in
conjunction with a suitable client tool, provides end users with an interactive means for visualizing data
without the need to download large files or interpret complex metadata. It is also used as a “bridging”
tool providing interoperability between the environmental science community and users of geographic
information systems. ncWMS implements a number of extensions to the WMS standard in order to fulfil
some common scientific requirements, including the ability to generate plots representing timeseries
and vertical sections. We discuss these extensions and their impact upon present and future interoperability.
We discuss the conceptual mapping between the WMS data model and the data models used by
gridded data formats, highlighting areas in which the mapping is incomplete or ambiguous. We discuss
the architecture of the system and particular technical innovations of note, including the algorithms used
for fast data reading and image generation. ncWMS has been widely adopted within the environmental
data community and we discuss some of the ways in which the software is integrated within data infrastructures
and portals.
A Web Map Service implementation for the visualization ofmultidimensional gridded environmental dataWe describe ncWMS, an implementation of the Open Geospatial Consortium’s Web Map Service (WMS)specification for multidimensional gridded environmental data. ncWMS can read data in a large numberof common scientific data formats e notably the NetCDF format with the Climate and Forecast conventionse then efficiently generate map imagery in thousands of different coordinate reference systems.It is designed to require minimal configuration from the system administrator and, when used inconjunction with a suitable client tool, provides end users with an interactive means for visualizing datawithout the need to download large files or interpret complex metadata. It is also used as a “bridging”tool providing interoperability between the environmental science community and users of geographicinformation systems. ncWMS implements a number of extensions to the WMS standard in order to fulfilsome common scientific requirements, including the ability to generate plots representing timeseriesand vertical sections. We discuss these extensions and their impact upon present and future interoperability.We discuss the conceptual mapping between the WMS data model and the data models used bygridded data formats, highlighting areas in which the mapping is incomplete or ambiguous. We discussthe architecture of the system and particular technical innovations of note, including the algorithms usedfor fast data reading and image generation. ncWMS has been widely adopted within the environmental
data community and we discuss some of the ways in which the software is integrated within data infrastructures
and portals.
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