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TileCache 1.4 Released
posted by Satri
on Wednesday February 07, @02:42PM
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from the tiling-the-universe dept.
from the tiling-the-universe dept.
The OpenLayers mailing list announced the release of TileCache 1.4. From the announcement: "TileCache provides a Python-based WMS/TMS server, with pluggable caching
mechanisms and rendering backends. In the simplest use case, TileCache
requires only write access to a disk, the ability to run Python CGI
scripts, and a WMS you want to be cached. With these resources, you can
create your own local disk-based cache of any WMS server, and use the
result in any WMS-C supporting client, like OpenLayers, or any TMS
supporting client, like OpenLayers and worldKit." See also the OSGeo Tile Map Service specification.
Related Stories
Industry: New Tile Map Service Specification 5 comments
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The import cartography blog links to the OSGeo new Tile Map Service Specification wiki page. From the wiki: "This standard specifies the behavior of a service that provides access to georeferenced maps in the form of a regularly spaced set of regularly sized squares at a finite number of scales. This standard specifies operations to retrieve a computer-readable description of the service instance and to retrieve particular tiles.
A Tile Map Service provides access to cartographic maps of geo-referenced data, not direct access to the data itself. This document standardizes the way in which map tiles are requested by clients, and the ways that servers describe their holdings. "
OpenLayers 2.3 Released
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The OpenLayers mailing list announced the release of OpenLayers 2.3. Here are the release notes. OpenLayers is in the OSGeo incubation process. From their about: "OpenLayers makes it easy to put a dynamic map in any web page. It can display map tiles and markers loaded from any source. MetaCarta developed the initial version of OpenLayers and gave it to the public to further the use of geographic information of all kinds. OpenLayers is completely free, Open Source JavaScript, released under the BSD License." To be honest, I'm enthusiastic about OpenLayers since it makes it very easy to generate mashups, and allows you to keep using Google Maps tiles, and to map GeoRSS feeds (this is still under construction).
Industry: Geospatial Standards Block Innovation? 4 comments
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Charlie Savage has an interesting and severe critic of geospatial standards, including GML, WMS, SLD, WFS and of course KML and GeoRSS are also discussed. Here's a recent previous entry from the same blog on the same topic. From the first link: "So do you see these standards used on the Web? I sure don't. Instead I see people using RSS and ATOM with GeoRSS, or shoehorning feature information into KML. There is event talk of shoehorning GML into KML. [...] So standards strike out on map rendering and sharing geographic features, but have succeeded in specifying locations and custom map content. And there is an interesting pattern here - the dejure standards have failed, while the defacto standards have succeeded."
Map Caching for Beginners in ESRI Products
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The ArcGIS Server Development Blog has a entry explaining map caching for beginners, with an emphasis on ESRI products applications. From the entry: "Map caching is a very effective way to make your ArcGIS Server maps run faster. When you create a map cache, the server draws the entire map at several different scales, then stores copies of the map images. The server can then distribute these images whenever someone asks for a map. It’s much quicker for ArcGIS Server to hand out a cached image than to draw the map each time someone requests it. Another benefit of caching is that the amount of detail in the image doesn’t noticeably affect how quickly the server can distribute the copy." See also related stories.
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