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KML is a very special output format. It contains the    it has no notion of output size since it is displayed on the globe.   KMZ is the compressed version of the KML files and is written by default. You can write out the uncompressed KML if you want to debug the output.

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Some graphical formats, such as PostScript and PDF, allow multiple pages within the documents. Other formats, such as PNG, which will contain a single page at the time and therefore contain a number in their name filename to indicate which page number they contain. You can trigger a new page in Metview Macro with the function

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This function is normally used within loops to generate output of each iteration on a separate page (or file).

Task

Take one of your existing Macros containing a loop and try to print each iteration on a pagethe macro from the previous task and add a page where you visualise the same field but over Europe only.

Further processing outside Metview

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If you have time you might want to try out opening your SVG file from the first exceicise exercise above in inkscape and  and alter it and save it to a PNG.

Using Web Map Services (WMS)

Metview provides a module to request maps from a Web Map Services (WMS). The WMS standard is defined by the Open Geospatial Consortium (OGC), which is very popular in the GIS community. The WMS module can be used to query an OGC-compliant WMS server, retrieve maps from it and overlay them with other data. There The WMS icon is a great way to integrate web services within Metview.

We have a separate tutorial on  which shows in more detail how you can integrate maps in Metview.The only thing you need to know is that to use a map service you need to request a so-called GetCapabilities document first. This document contains all information (in human and machine readable form) on what maps are offered and what the client can do. Metview will parse this file and offers you a convent and easy to use interface to request the maps you want.

Extra tasks

use maps served by web map services within Metview.

Tasks

• Try out the four WMS icons in the directory by visualising them.
• Drop the icon into a macro editor to explore how a WMS retrieval looks like.
• Work through the WMS tutorial. You can skip some parts, like the manual editing for request if you wish so.
• Try the following WMS services: