QGIS: Adding WMS Layers

Web Map Service (WMS) layers are map layers that are streamed over the web. These layers can range from imagery to map coverages and anything in-between. There are several advantages to using this type of layer over downloading data and storing it on your local machine. For one, high resolution imagery usually has a very large file size which can quickly use up memory on a local machine. WMS layers are usually updated by the publisher, giving you the most up-to-date layer without having to download it again. Secondly, using a WMS layer for imagery gives you a seamless image between counties boundaries. Seamless images are important because there is not always exact alignment between county boarders when downloading imagery on a county by county basis. An important high-speed Internet connection is needed when using a WMS layer in order to view the layer quickly.

This task sheet will demonstrate how to connect to WMS layers using QGIS and show you the difference between a seamless and a seamed image.

Pages / Length: 2
Publication Date: 04/2014

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