---------- Forwarded message ---------- From: Frank Warmerdam <[EMAIL PROTECTED]> Date: Mar 30, 2007 9:32 AM Subject: Re: [Freegis-list] Binary Format For Features To: Sunburned Surveyor <[EMAIL PROTECTED]>
Sunburned Surveyor wrote:
I'm currently talking with some of the other OpenJUMP developers about a simple binary format that we can use to store Features in a way that complements the storage of geometries in the OpenGIS Well-Known-Binary WKB format. I thought this might be of interest to other open source GIS projects, so I am sending a brief message here. I'd be willing to work with developers from other projects on a format that could be used by other applications. I've put a rough draft of the format here: http://thejumppilotproject.pbwiki.com/OpenJUMP-Binary-Feature-Format Let me know if your interested, or if you have any suggestions. I hope to finalize the format in the next week or two. In the next month or two I hope to have a working parser for the binary format in Java that will be released under the GPL through the SurveyOS SourceForge Project.
Landon, I am interested in this effort. I think a binary "simple features" file format with the potential for efficient access is interesting, and valuable, and I might like to implement support for it in OGR as well. I reviewed http://thejumppilotproject.pbwiki.com/OpenJUMP-Binary-Feature-Format and what is there looks good, but it seems incomplete. For instance, the header appears to be a feature header, rather than file header, is that right? Shouldn't there be some sort of file level header or is it intended that a file is just a collection of features appended? I'd like some options for efficient access. The most obvious thing needed for this is an index to the features relating feature id with offset in the file. This also gives the opportunity to add a spatial index, perhaps as a seperate file, at some point in the future. Is there a good place to discuss this? PS. I think it would be great if a Java implementation of this could be done in a way that would easily drop into Geotools without license conflicts. I think Geotools is LGPL, is that right? Best regards, -- ---------------------------------------+-------------------------------------- I set the clouds in motion - turn up | Frank Warmerdam, [EMAIL PROTECTED] light and sound - activate the windows | http://pobox.com/~warmerdam and watch the world go round - Rush | President OSGeo, http://osgeo.org
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