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Saturday, 18 April 2015

Feel the history with the help of OpenWebGIS. Examples

Use the opportunities of free and open geographic information system OpenWebGIS to create your maps and share them with friends and colleagues. As example study the map of ancient roads and ports in Italy and surrounding areas. See this map on Figure 1 and use embedding interractive map - Map 1. About how to embed OpenWebGIS map in your sites or blogs read the article: http://openwebgisystem.blogspot.com/2015/04/blog-post.html
 Figure 1.

Map 1.

In order to see the attribute information of layers Roman_Roads and Ancient_Ports you need:
to select Layer's name " Roman_Roads " or " Ancient_Ports" in the dropdown list "Editable Layer". Then click (on the map) on the point or line you are interested in. The values of all attributes of the point, line you can see by hovering the cursor over it and clicking on it (if while hovering over a point, it is not activated, then move the map a little bit and then again hover the cursor). After clicking on the feature you are interested in, the pop-up window will be opened. In this window you will see all layer attributes. See the result of it in Figure 2.
 Figure 2.


Information for this map was taken from here: M McCormick et al. 2013 - Roman Road Network (version 2008) Abstract:This file provides a portable, digital version of the Roman roads identified in the Barrington Atlas, which users can visualize in combination with their own historical data. A de Graauw 2014 - Geodatabase of Ancient Ports and Harbors (version 1.1) Abstract: This database presents work done by Arthur de Graauw to collect, identify and locate ancient harbours and ports. It is based on a study of existing documentation and does not aim to find unknown ports.

Let's see another example of adding history information on the map using WMS layers. 
In OpenWebGIS the module for working with WMS layers has been completely redesigned. Look at the Interactive map with WMS layers of Provinces (ca. Ad 303-324) and RomanRoads. See this map on Figure 3 and use embedding interractive map - Map 2.
 Figure 3.

Map 2.

If earlier it was possible to connect the layers with only those servers that support the technology CORS, it is now possible to connect the WMS layers with any servers. Now you can save WMS layers on the OpenWebGIS server for quick access for other work sessions with OpenWebGIS.
There is the brief algorithm of connecting WMS layer to OpenWebGIS:
1. Select the menu item "Layers"->"New Layer from WMS url",
2. In the pop-up window in the corresponding text field enter the server url, for example: http://cga6.cga.harvard.edu/arcgis/services/darmc/roman/MapServer/WMSServer?request=GetCapabilities&service=WMS ,
3. Press the buttons "OK" or "Get list",
4. Wait for the list of layers ,
5. Press the "Add Layer" or if you need to save the layer click checkbox "Save layer on the server"
6. Important: if you add WMS layers and then change the base layer, it may occur an error with redrawing of the map, so select the base layer in advance.
In order to assess the possibility of working with WMS layers I offer to use materials of the remarkable project: The Digital Atlas of Roman and Medieval Civilization (DARMC) http://darmc.harvard.edu/icb/icb.do?keyword=k40248&pageid=icb.page188865 Here one can find the Roman road networks, bridges, aqueducts, the cities and settlements of the empire, Roman military installations, the shrines, mines, and villas that already appeared in the Barrington Atlas and in other similar research tools. But here one can also follow the rise and fall of the main kingdoms, empires, and principalities of medieval Europe, the offices of the great trading federation of the Hanseatic League, the spread of Cluniac monasticism, the medieval universities.
Look at the example of work this WMS layers on the video:


 

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