-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi,
I'm using django and basemap to render tiles i can use to make an overlay on google maps. I'm using this to generate a topology of an open mesh network (freifunk) here in leipzig :) On my local developing machine this works very nice and due heavy caching of database lookups it doesn't seem slow. My problem is, that the production machine isn't that fast and has to little memory :( Now I'm thinking of a better algorithm to generate the tiles. Currently they are generated on demand and then saved to disc for later usage. But the topology is fetched every 10 minutes, so the disc files timeout relative fast. my current algorithm looks like this: fetch all node positions and cache them through pickle. These are rendered as small blue dots on the map (Yes, here I can optimize to only call plot when the node is in boundries of the tile. then all connections for the last topo are fetched and cached. Now there is a problem, I have to plot all connections into the plot, because it's not easy to say which lines are actually in the tile. I haven't looked deep into matplotlib to know how optimized it already ignores plots which are out of bound. Now I'm asking my self: is it possible to make a basemap instance with some lat/lng borders, plot all stuff in it, and then move the borders to get a new tile which is next to the last one ? Would such a algorithm be faster then the current one ? If not, there is also the posibility to create one large image at largest zoomlevel for the most used region and then cut and scale the image until all tiles are generated. You can find the sourcecode at: http://ff-firmware.quamquam.org/trac/browser/ffsomething/trunk/apps/uptime/topoimg.py mktopo() is acutally doing the work :) kindly regards Daniel -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.3 (GNU/Linux) Comment: GnuPT 2.7.2 Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFE24sHy/mkIQp7AD0RApIIAJ9rixzc9B84H/rvkZi5WZHeNmLb0QCgnrzx De40WjI3L2E4/rdOlorGO1M= =6Fq9 -----END PGP SIGNATURE----- ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
