Changes between Version 68 and Version 69 of WKTRasterTutorial01

Timestamp:

Jun 17, 2010, 1:33:12 PM (14 years ago)

Author:

pracine

Comment:

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WKTRasterTutorial01

@@ -338 +338 @@
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-This version takes only 7.4 minutes. Almost half the time spent by the preceding one... This little increase in complexity certainly worths the gain in performance. The size of the tiles has also a major effect here. If we restart the whole process with 100 pixels x 100 pixels tiles the intersection operation takes 9 minutes. 200 pixels x 200 pixels: 47 minutes... 30 pixels x 30 pixels: 5 minutes. You choose...
+This version takes only 7.4 minutes. Almost half the time spent by the preceding one... This little increase in complexity certainly worths the gain in performance. The size of the tiles has also a major effect here. If we restart the whole process with 200 pixels x 200 pixels tiles the intersection operation takes 47 minutes. 100 pixels x 100 pixels: 17 minutes... 30 pixels x 30 pixels: 5 minutes. On the other side, more tiles there is to write in the sql file, longer the loading process. You choose... Smaller tiles is generally a better choice.
 
 Once again you can visualise the result of the query by doing this query in OpenJUMP (you might have to increase RAM allowed to OpenJUMP by changing "-Xmx256M" to "-Xmx1024M" in "OpenJUMPInstallPath/bin/openjump.bat"):