Oracle Map builder simple map
Today I'm going to show how to create a very simple map based on the OSM data loaded into a Oracle Database. I use Germany OSM data for this guide.
The root post if this series is: Maps starting post. It has links to other posts of this series.
The first step is to download a Map Builder tool for building a map. It's available on the "Software Downloads for Oracle Fusion Middleware MapViewer" page.
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After downloading and unpacking the archive, I got three jar-files.
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The only tool I use in this post is mapbuilder.jar. You need java installed to run it. It's possible to run it either by double-clicking or using a command line, depending on your machine setup.
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Map builder needs a connection to a database which stores map data. I don't think that creation of a connection needs any comments.
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In the real life, I'd start with defining some styles for lines, and polygons, and markers. But it would make this post too big. So I use predefined styles, although they aren't nice.
I'll create a layer with German cities. Right-click on the
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Geometry Themes node and create a new theme.
The name of my theme is "Cities" and it use the
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POINTS table.
Now I need to define the appearance of the theme.
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As this is a theme for points, I choose the "Marker" style. .png)
All predefined styles are stored in the
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MDSYS schema.
There are only a few markers predefined, but I need only one for this time.
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M.TOWN_HALL for example.
I want all the cities to be labelled with names so I choose labels style and attribute for labels.
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And the last thing to do. The
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POINTS table stores all points of all types. Not only cities, but other settlement types, and POIs and other stuff. So I create a filter to select only data on cities.
Not every option is defined by the wizard. There are a lot of other options to define, but it's OK for the first pass.
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To see how the layer looks like, open the "Preview" tab and click green play button.
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It's possible to get an error at this step. When I try to zoom in I get ORA-13226: interface not supported without a spatial index message.
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The cause of this error is the absence of a spatial index. A spatial index should be created for every table. Actually, it's a good idea to create a few non-spatial indexes too. For example, it's much easier to find cities if the
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place field is indexed.
I created two more geometry themes. One for a country border. It's based on the
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MULTYPOLYGONS table and styled with line.
Different types of administative regions can be selected with the
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ADMIN_LEVEL field. Country border has ADMIN_LEVEL='2'.
And one more theme is
FEDERAL_LAND. It's also built on the MULTYPOLYGON table, but its ADMIN_LEVEL='4'.
Now I have everything to create a very simple map of Germany. Right-click on the "Base map" node, select
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create.
Give a name to the map.
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Add all themes to the map.
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There are parameters that should be tweaked in the real life, but I leave defaults for this time.
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And here it is - a simple map of Germany. It's very simple and needs a lot of work to become nice. But even now it is sufficient to visualize some data for cities and federal lands.
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I'll show how to setup Oracle Mapviewer 12c to work with this map in the next post.
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