Experimental NRT Global composite from NPP VIIRS created from Unprojected Swath Data from NPP VIIRS. Data provided by NOAA/NESDIS Center for Satellite Applications and Research)
ERDDAP's Web Map Service (WMS) lets you request an image with data plotted on a map.
WMS
is an Open Geospatial Consortium (OGC)
and ISO (19128)
standard for "the creation
and display of registered and superimposed map-like views of information that come
simultaneously from multiple remote and heterogeneous sources."
See the
list
of datasets available via WMS at this ERDDAP installation.
Three Ways to Make Maps with WMS
In theory, anyone can download, install, and use WMS client software. Some clients are:
ArcGIS,
Refractions PHP WMS Client, and
uDig.
To make a client work, you would install the software on your computer.
Then, you would enter the URL of the WMS service into the client.
For example, in ArcGIS (not yet fully working because it doesn't handle time!), use
"Arc Catalog : Add Service : Arc Catalog Servers Folder : GIS Servers : Add WMS Server".
In ERDDAP, this dataset has its own WMS service, which is located at
http://cwcgom.aoml.noaa.gov/erddap/wms/VIIRS_OC_NRT/request?
(Some WMS client programs don't want the ? at the end of that URL.)
See the
list
of datasets available via WMS at this ERDDAP installation.
In practice, we haven't found any WMS clients that properly handle dimensions
other than longitude and latitude (e.g., time), a feature which is specified by the WMS
specification and which is utilized by most datasets in ERDDAP's WMS servers.
You may find that using
Make A Graph
and selecting the .kml file type (an OGC standard)
to load images into Google Earth provides
a good (non-WMS) map client.
See the
list
of datasets with Make A Graph at this ERDDAP installation.
Web page authors can embed a WMS client in a web page. For the map above, ERDDAP is using
OpenLayers, which is a very versatile WMS client.
OpenLayers doesn't automatically deal with dimensions other than longitude and latitude
(e.g., time), so you will have to write JavaScript (or other scripting code) to do that.
(Adventurous JavaScript programmers can look at the Souce Code for this web page.)
A person with a browser or a computer program can generate special WMS URLs. For example,
In practice, it is probably easier and more versatile to use this dataset's
Make A Graph web page than to use WMS for this purpose.
See the
list
of datasets with Make A Graph at this ERDDAP installation.
ERDDAP, Version 1.30
Questions, comments, suggestions? Please send an email to
joaquin dot trinanes at noaa dot gov and include the ERDDAP URL directly related to your question or comment.
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