Revision as of 04:30, 28 December 2016

Map Theme Creation Wizard

The Map Theme Creation Wizard is an useful process through which you can create new map themes to visualize in the Marble program.

Creating a map using the Map Theme Creation Wizard

You can choose between 3 sources to retrieve the map through the Map Theme Creation Wizard:

Web Map Service – from a Web Map Service (WMS)
WorldMap Bitmap – through a bitmap image of the world stored locally
Static Server URL – online maps (with a Static URL, in the OSM style)

Web Map Service

The Web Map Service (WMS) is a standard protocol for serving georeferenced map images over the Internet that are generated by a map server using data from a GIS database – see What is a Web Map Service below.

You can choose your server by the drop-down list or by typing it in the box. Then you have to inspect it and select the available maps. In this example we will use the following URL: http://map1.naturschutz.rlp.de/service_lanis/mod_wms/wms_getmap.php?mapfile=lrt_RP& and the following maps from the dropdown list: FFH-Lebensraumtypen

Then you have to type in your map title, theme, description and supply an image (by using a suggested image or choosing a file). If you wish to take the suggested image, you have to press the Suggest button and press OK. Confirm that the image it shows is suitable for you. In this example a local file is used.

At last there is a summary of the map theme you are creating. If you are satisfied with this summary, you can press Finish button and complete the map theme creation.

WorldMap Bitmap

The WorldMap must be an image file stored in an image file (JPG, PNG, etc. type). It needs to be provided in Equirectangular projection. You have to choose your map source image from a path, or the file chooser button, ... next to the text field for Source Image and optionally, a legend image to display a map key on the map, in theLegend Image text field. In this example the following was used, downloaded locally: http://veimages.gsfc.nasa.gov/2430/land_ocean_ice_2048.jpg.

Then you have to write Map Title, Theme, Description and an image (suggested or chosen by file). In this example we have used the suggested image, to choose it you have to press Suggest and then press OK on the new window that will appear with a scaled down image sample.

A summary map is then displayed. Once you are happy, select Finish to complete the map theme creation.

Static Server URL

You can also get maps from a remote server, you need only to insert the server URL in the box and choose the file format. To be sure the server exists, and is working, you can select Test the Server. The URL that is chosen for our example is http://veimages.gsfc.nasa.gov/2430/land_ocean_ice_2048.jpg. You may also provide an image with which to display a map key for your map, as the Legend Image, either specified by path or by using ... to choose an image file.

Next, you type in your map title, theme, description, and supply an image (by using a suggested image, using Suggest, or from choosing a file). As the image, in this example, a local version of http://veimages.gsfc.nasa.gov/2430/land_ocean_ice_2048.jpg was chosen.

After selecting Next, the map summary is displayed, and you can press Finish button to confirm that the summary is correct, and complete the wizard.

FAQ

What is a Web Map Service?

A Web Map Service (WMS) produces maps of georeferenced data. We define a "map" as a visual representation of geodata; a map is not the data itself. WMS is the production of spatially referenced data dynamically from geographic information. The map itself is an actual portrayal of geographic information presented as a digital image file for display on a computer. WMS maps are in picture formats such as PNG, GIF or JPEG. The OGC WMS specification standardizes the way in which maps are requested by clients and the way that servers describe their data holdings.

You can find more at:

What is an Equirectangular Projection?

A type of projection for mapping a portion of the surface of a sphere to a flat image. It is also called the "non-projection", or plate carre, since the horizontal coordinate is simply longitude, and the vertical coordinate is simply latitude, with no transformation or scaling applied. The equirectangular projection was used in map creation since it was invented around 100 A.D. by Marinus of Tyre.

You can find more about it from:

Where can I find new maps?

There are several websites offering free maps, including:

@@ Line 33: / Line 33: @@
 === WorldMap Bitmap ===
-The WorldMap must be an image file stored in an image file (JPG, PNG, etc. type). It needs to be provided in [[#Equirectangular projection|Equirectangular projection]].
+The WorldMap must be an image file stored in an image file (JPG, PNG, etc. type). It needs to be provided in [[#What is an Equirectangular projection?|Equirectangular projection]].
 You have to choose your map source image from a path, or the file chooser button, <menuchoice>...</menuchoice> next to the text field for ''Source Image'' and optionally, a legend image to display a map key on the map, in the''Legend Image'' text field.
 In this example the following was used, downloaded locally: ''http://veimages.gsfc.nasa.gov/2430/land_ocean_ice_2048.jpg''.