A TDS WMS GetMap request returns at most 1 WMS layer per request. If one
requests more, by specifying a comma-separate list form layers= and styles=,
TDS returns an error message
<ServiceExceptionReport xmlns="http://www.opengis.net/ogc";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; version="1.3.0"
xsi:schemaLocation="http://www.opengis.net/ogc
http://schemas.opengis.net/wms/1.3.0/exceptions_1_3_0.xsd";>
<ServiceException>
You may only create a map from 1 layer(s) at a time
</ServiceException>
</ServiceExceptionReport>
However, the WMS 1.3.0 standard prescribes that in this case TDS should
explicitly mention a <LayerLimit> element in the GetCapabilities:
"The optional <LayerLimit> element in the service metadata is a positive
integer indicating the maximum number of layers a client is permitted to
include in a single GetMap request. If this element is absent, the server
imposes no limit." (page 23, OpenGIS(r) Web Map Server Implementation
Specification)
This means that THREDDS should add this element to the GetCapabilities
(LayerLimit=1) (or return more maps to be OGC compliant).
DISCLAIMER: This message is intended exclusively for the addressee(s) and may
contain confidential and privileged information. If you are not the intended
recipient please notify the sender immediately and destroy this message.
Unauthorized use, disclosure or copying of this message is strictly prohibited.
The foundation 'Stichting Deltares', which has its seat at Delft, The
Netherlands, Commercial Registration Number 41146461, is not liable in any way
whatsoever for consequences and/or damages resulting from the improper,
incomplete and untimely dispatch, receipt and/or content of this e-mail .
