Changes between Version 10 and Version 11 of SoCWMSDriver

Timestamp:

Jul 16, 2007, 9:00:41 AM (17 years ago)

Author:

nowakpl

Comment:

--

SoCWMSDriver

@@ -50 +50 @@
         };
 }}}
-===Dataset open===
+=== Dataset open ===
  1. open, verify and read XML configuration file into CPL MiniXML tree
  2. update XML tree with arguments specified in dataset name
  3. create instance of mini-driver and pass in the XML tree
-===Dataset image request===
+=== Dataset image request ===
  1. validate the request
  2. check if request can be satisfied from block cache only and return the data to user if possible
@@ -61 +61 @@
  5. update block cache wherever possible (resolution match, complete coverage)
  6. return the data to user
-===Download cache===
+=== Download cache ===
 If enabled in XML configuration file and allowed by mini-driver, downloaded images will be written to disk for future use. This should reduce load on the WMS server or even allow off-line operation.
 HTTP download queue
 Download queue is implemented using libcurl (http://curl.haxx.se/libcurl/), running in dedicated background thread to allow data preloading (AdviseRead or guessed). Can be configured to use HTTP pipelining and multiple connections.
-===XML configuration file===
+=== XML configuration file ===
 {{{
         <GDALWMS>
@@ -129 +129 @@
         </Cache>
 }}}
-===Mini-driver===
+=== Mini-driver ===
 '''Image download request''', filled in by mini-driver and returned to interface layer.
 {{{
@@ -183 +183 @@
 }}}
 
-===Planned mini-drivers===
+=== Planned mini-drivers ===
  * OGC WMS (http://www.opengeospatial.org/standards/wms)
  * TMS (http://wiki.osgeo.org/index.php/Tile_Map_Service_Specification)
@@ -190 +190 @@
  * World Wind tiled datasets, both remote http and local file versions (http://issues.worldwind.arc.nasa.gov/confluence/download/attachments/394/world+wind+tile+systemt.gif)
  * TileService (no docs, similar to World Wind, example http://s0.tileservice.worldwindcentral.com/getTile?interface=map&version=1&dataset=bmng.topo.bathy.200401&level=0&x=0&y=0)
-===OGC WMS mini-driver===
-The driver will not issue GetCapabilities requests, all information has to be stored in XML configuration file. Small utility program will be provided (probably a script) to handle GetCapabilities requests and write configuration file.
-Arbitrary overviews handled by WMS server.
-Custom arguments in server URL (for example WMS Time)
-Many download patterns:
- 1. one download (light green) per image request (dark green), partial block cache (gray), disk cache not allowed
- 2. one download per image request, extended to block cache grid, disk cache not allowed
- 3. many downloads per image request (tiled), full block cache, disk cache allowed
+=== OGC WMS mini-driver ===
+ * The driver will not issue GetCapabilities requests, all information has to be stored in XML configuration file.
+ * Small utility program will be provided (probably a script) to handle GetCapabilities requests and write configuration file.
+ * Arbitrary overviews handled by WMS server.
+ * Custom arguments in server URL (for example WMS Time)
+ * Many download patterns:
+  1. one download (light green) per image request (dark green), partial block cache (gray), disk cache not allowed
+  2. one download per image request, extended to block cache grid, disk cache not allowed
+  3. many downloads per image request (tiled), full block cache, disk cache allowed
 '''OGC WMS mini-driver configuration'''
 {{{
@@ -212 +213 @@
         </DataSource>
 }}}
-===Example mini-driver implementation===
+=== Example mini-driver implementation ===
 Mini-driver for a WMS-like service with requests in format:
 http://server/file?width=...&height=...&bbox=...