Tuesday, August 22, 2017

WMS File Update

The U.S. Drought Monitor WMS file have undergone some changes recently. This page will explain what changed and how to use the WMS set up.


Base URL

The WMS files are hosted on a new server and located at a new URL. Here is the basic URL required to use the WMS service:

http://ndmc-001.unl.edu:8080/cgi-bin/mapserv.exe?map=/ms4w/apps/usdm/service/[map file name].map

WMS Version

The WMS version has been upgraded from 1.1.1 to 1.3.0. As a part of these changes, the coordinate parameter has changed from SRS to CRS. Also with some projections (such as EPSG:4326), the order of the coordinates has changed. The latitude coordinates in the bounding box will come first.


The WMS files are projected in Web Mercator by default (EPSG:3857) but are also available in WGS84 (EPSG:4326).

File Naming Conventions

The file names have been altered to use a 4-digit year. The map files are now named using this format:


The layer naming convention has also changed:



Here are some example URLs for January 7th, 2017 and also the current USDM which changes each week:



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