OGC WMTS (Web Map Tile Service) Reader Parameters

The URL for the WMTS server. A typical URL specifying a WMTS server looks like:

http://www.mywmtsserver.com/wmts?SERVICE=WMTS&REQUEST=GetCapabilities

After you have completely specified the connection, click the Browse button to select layers for import. A connection window appears while the system compiles a list from the WMTS server.

Once the layer list appears, you can select one of the layers, and then click OK to dismiss the window. The layer name will appear in the layer list field in the Reader Parameters box.

This option prioritizes the WMTS source URL to build the GetTile request.

It will not use the defaults from the GetCapabilities result returned by the WMTS server.

This option prioritizes using either RESTful or KVPs encoding with the GetTile requests.

If the server does not support RESTful but supports KVPs, then KVPs encoding will still be used.

This option instructs the reader to continue downloading and reading tiles when the current tile results in an image reading error.

Authentication Method

Specify the authentication method to use when accessing a password-protected server.

• Basic (default) – Basic access authentication is designed to allow a client to provide credentials to a server on the assumption that the connection between them is trusted and secure. Note that any credentials passed from client to server can be easily intercepted through an insecure connection.
• Digest – Digest authentication is one of the agreed-upon methods a web server can use to negotiate credentials, such as username or password, with a user's web browser.
• NTLM – A challenge-response protocol that is used to provide compatibility with versions of Windows earlier than the Windows 2000 operating systems.
• Web Connection – Web connections provide a convenient and secure way to store and reuse previously established connection parameters. See Web Connection below.
• Single Sign-on – FME will use the credentials of the current user to authenticate the HTTP request. This authentication method currently works only on the Windows operating system.

Web Connection

Using Web Connections

FME Options: Web Connections

Maximum Number of Concurrent Tile Downloads – The value of this parameter indicates the maximum number of tiles that will be downloaded at the same time.

When enabled, the WMTS Reader will attempt to retry requests that have failed, or returned an HTTP error.

This parameter can be used to customize the request that FME will make to the server.

• Name column – This is a list of commonly used header names. The table below gives brief descriptions. For more comprehensive descriptions and examples, see List of HTTP Header Fields and HTTP headers.

• Value – Enter or construct from attribute values.

Common HTTP Header Names

Name Column Choice	Description
Accept	Acceptable media type(s) for the response.
Accept-Charset	Acceptable character sets.
Accept-Datetime	Acceptable version in time.
Accept-Language	List of acceptable languages for response.
Authorization	Credentials for HTTP authentication.
Cache-Control	Used to specify directives that must be obeyed by all caching mechanisms along the request-response chain.
Content-MD5	A Base64-encoded binary MD5 sum of the content of the request body.
Cookie	An HTTP cookie previously sent by the server with Set-Cookie.
DNT	Requests a web application to disable user tracking, supported by most web browsers.
Expect	Indicates that particular server behaviors are required by the client.
From	The email address of the user making the request.
If-Match	Only perform the action if the client-supplied entity matches the same entity on the server.
If-Modified-Since	Allows a 304 Not Modified status code to be returned if content is unchanged.
If-None-Match	Allows a 304 Not Modified status code to be returned if content is unchanged.
If-Range	If the entity is unchanged, send the missing part(s); otherwise, send the entire new entity.
Max-Forwards	Limit the number of times the message can be forwarded through proxies or gateways.
Origin	Initiates a request for cross-origin resource sharing.
Pragma	Implementation-specific fields that may have various effects anywhere along the request-response chain.
Range	Request only part of an entity.
Referer [sic] Note  The word referrer has been misspelled in most implementations since its incorporation into the original standards document. Referer has become a widely used spelling in the industry when discussing HTTP referrers.	The address of the previous web page from which a link to the currently requested page was followed.
TE	The form of encoding used to safely transfer information.
User-Agent	A characteristic string that identifies the application, operating system, vendor, and/or version of the requesting user agent.
Upgrade	Ask the server to upgrade to another protocol.
Via	Informs the server of proxies through which the request was sent.
Warning	A general warning about possible problems with the entity body.
X-Forwarded-For	A de facto standard for identifying the originating IP address of a client connecting to a web server through an HTTP proxy or load balancer.
X-Requested-With	Mainly used to identify Ajax requests (most JavaScript frameworks send this field with value of XMLHttpRequest); also identifies Android apps using WebView

Click the browse button (...) to open the Select Format dialog for selecting the GetTile request format. Select a format and click OK.

Click the browse button (...) to open the Tile Matrix Set dialog. Select a tile matrix set option and click OK.

This parameter allows you to select one of the predefined sets of tiles that the WMTS server provides.

Click the browse button (...) to open the Time Matrix (Resolution) dialog. Select the target resolution and click OK.

This parameter allows you to pick the resolution/zoom-level of the returned layer. The higher the resolution, the more tiles need to be retrieved from the server. When choosing a higher resolution, it is recommended to narrow down the area of interest by specifying a Tile Selection Method (refer to Tile Selection Options for more information).

Click the browse button (...) to open the Style dialog. Select a Style and click OK.

If not specified, the server uses the default style method specified in the GetCapabilities document. If no default style was specified, the first style option will be selected.

Use this parameter to expose Format Attributes in FME Workbench when you create a workspace:

• In a dynamic scenario, it means these attributes can be passed to the output dataset at runtime.
• In a non-dynamic scenario, this parameter allows you to expose additional attributes on multiple feature types. Click the browse button to view the available format attributes (which are different for each format) for the reader.

Coordinate systems may be extracted from input feature data sources, may come predefined with FME, or may be user-defined. FME allows different output and input coordinate systems, and performs the required coordinate conversions when necessary.

For systems that know their coordinate system, the Coordinate System field will display Read from Source and FME will read the coordinate system from the source dataset. For most other input sources, the field will display Unknown (which simply means that FME will use default values). In most cases, the default value is all you'll need to perform the translation.

You can always choose to override the defaults and choose a new coordinate system. Select More Coordinate Systems from the drop-down menu to open the Coordinate System Gallery.

Changing a Reprojection

To perform a reprojection, FME typically uses the CS-MAP reprojection engine, which includes definitions for thousands of coordinate systems, with a large variety of projections, datums, ellipsoids, and units. However, GIS applications have slightly different algorithms for reprojecting data between different coordinate systems. To ensure that the data FME writes matches exactly to your existing data, you can use the reprojection engine from a different application.

To change the reprojection engine, Select Workspace Parameters > Spatial > Reprojection Engine. In the example shown, you can select Esri (but the selection here depends on your installed applications):