WebMapServer

Web map server

Description

A WebMapServer object represents a Web Map Service (WMS) and acts as a proxy to a WMS server.

The WebMapServer object resides physically on the client side. The object can access the capabilities document on the WMS server and perform requests to obtain maps. It supports multiple WMS versions and negotiates with the server automatically to use the highest known version that the server can support.

Creation

Syntax

server = WebMapServer(serverURL)

Description

server = WebMapServer(serverURL) creates a WebMapServer object, setting the ServerURL property.

Properties

Timeout — Number of milliseconds before a server times out

0 (default) | nonnegative integer

Number of milliseconds before a server times out, specified as a nonnegative integer. When Timeout has a value of 0, the WebMapServer object ignores the timeout mechanism.

Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64

EnableCache — Flag enabling cache

1 (default) | logical scalar

Flag enabling cache, specified as a logical scalar. When EnableCache is True, the WebMapServer object caches the WMSCapabilities object, which is returned when you use the getCapabilities method. The cache expires if the AccessDate property of the cached WMSCapabilities object is not the current day.

Data Types: logical

ServerURL — URL of the server

character vector

URL of the server, specified as a character vector. The URL must include the protocol 'http://' or 'https://'. The URL can contain additional WMS keywords.

Data Types: char

RequestURL — URL of the last request to the server

character vector

URL of the last request to the server, specified as a character vector. RequestURL specifies a request for either the XML capabilities document or a map. You can insert the requested URL into a browser.

Data Types: char

Object Functions

getCapabilities	Get capabilities document from server
getMap	Get raster map from server
updateLayers	Update layer properties

Examples

Get Capabilities Document from Web Map Server

Construct a WebMapServer object that communicates with one of the Environmental Research Division's Data Access Program (ERDDAP) WMS servers hosted by NOAA. Obtain the capabilities document from the server.

layers = wmsfind("NOAA_DHW",SearchField="serverurl");
serverURL = layers(1).ServerURL;
server = WebMapServer(serverURL);
capabilities = getCapabilities(server);
layers = capabilities.Layer;

Search for a server that shows nation boundaries (nations). Search for a server that provides daily, global sea surface temperature (sst) data.

nations = refine(layers,"nations");
nations = nations(1);
sst = refine(layers,"sst");
sst = sst(1);
layer = [sst nations];

Obtain the data from the servers.

request = WMSMapRequest(layer,server);
A = getMap(server,request.RequestURL);
R = request.RasterReference;

Display the data on a map.

figure
worldmap(A,R)
geoshow(A,R)
plabel off
mlabel off

layerTitle = string(sst.LayerTitle);
layerTitle = textwrap(layerTitle,65);
layerTitle = [layerTitle; sst.Details.Dimension.Default];
title(layerTitle,Interpreter="none")

Version History

Introduced before R2006a