When designing a map, sometimes you want to render something that is related to the geometries you have at hand, but which is not specifically the geometries themselves. Maybe you want to highlight the end of a line, create a drop shadow effect, or make the vertices that make up a geometry more evident to [...]
February 8, 2010 – 11:11 am
Ever had the need to format some text in SLD, or to perform complex filter in WFS, and noticed that the basic elements of the OGC Filter specification left you wanting for more?
If so, welcome to the club. One thing few people know is that both SLD and WFS filtering capabilities can be extended by [...]
Here’s a quick announcement for all those who understand the above: GeoServer now has a Spanish language users mailing list! Created and moderated by core GeoServer developer Gabriel Roldán, the mailing list is a resource for those who would like assistance in all things GeoServer, but prefer to discuss in Spanish. This marks the fourth [...]
Here’s a neat trick for those working with road maps that want to indicate traffic direction by way of appropriately pointed arrows. With text symbolizers using font characters, this is actually a snap, provided your data includes information about direction.
The New York City streets data set has an attribute field called trafdir which specifies [...]
Admit it. You love visualizing data. Mere tables do nothing for you, but the minute you can turn that into a map (or a graph or chart), information comes alive.
I was recently turned on to Swivel, a website that allows you to upload, visualize, and share data. The main page provides a [...]
January 30, 2009 – 1:40 pm
OpenStreetMap is a free and editable map of the world. Founded in 2004 in the United Kingdom in response to the need for a free geospatial data source, it is a community-driven project, allowing for anyone to edit and contribute information. It has since grown to include data from almost all countries in the world. The [...]
January 8, 2009 – 3:49 pm
Improvements to GeoServer are being made all the time, but to the average user, not all improvements are immediately discernible. However, recently a new feature has been added to GeoServer’s rendering algorithms, and all I can say is “wow.” I am referring to curved line labeling.
Labels on lines have rendering challenges that points [...]
December 18, 2008 – 9:36 am
A new post on the Raster Symbolizer tips & tricks, this time I am going to show how to build an RGB image using 8 bits or unsigned 16 bits multi band coverages.
I have been playing lately with some remote sensing data for the geoSDI project specifically the emissive subdataset coming from the MODIS sensor [...]
December 16, 2008 – 2:25 pm
In our previous post on dynamic symbolizers, we saw how we can generate dynamic external symbolizers based on feature attributes using only a simple style (SLD).
Today we’ll see two other features of dynamic symbolizers, namely:
using decorative TrueType fonts as markers in your map
Programing your own dynamic symbolizer to extend existing ones, with full access to [...]
December 9, 2008 – 11:55 am
The GeoServer team is happy to announce the release of GeoServer 1.7.1!
The biggest improvement in this release is better Google Earth support. Using revamped KML output (known as the KML “reflector”) GeoServer can now output vector super-overlays. Prior to this version, data served by GeoServer when viewed in Google Earth would only update when [...]