Deconstructing the map cache tiling scheme (Part II): Working with map caches programmatically

re: Deconstructing the map cache tiling scheme (Part II): Working with map caches programmatically

Stephan — Wed, 06 Feb 2008 10:56:21 GMT

Thanks for the post, this is very informative. I have a question regarding the level parameter (list of scales) in GenerateMapServerCacheTilingScheme when having WGS84. Since in Mercator projection the scale continously changes, how are the scales interpreted? Thanks Stephan

re: Deconstructing the map cache tiling scheme (Part II): Working with map caches programmatically

Chris — Thu, 06 Mar 2008 16:14:31 GMT

Finding the tile you need is great, but is there any code out there that can create the specified tile? In other words if you made a change data change in a cached service is there any way to recreate just the tile (singular) that was affected.

re: Deconstructing the map cache tiling scheme (Part II): Working with map caches programmatically

sterlingdq — Thu, 06 Mar 2008 16:53:41 GMT

@Stephan- My understanding is that for the Mercator projection the scales would be accurate at the Equator only.

re: Deconstructing the map cache tiling scheme (Part II): Working with map caches programmatically

sterlingdq — Thu, 06 Mar 2008 16:55:41 GMT

@Chris- The workflow for updating tiles is to use the Update Map Server Cache tool. You can pass a rectangular extent to this tool, so if you knew the area in which the edits occurred, you could conceivably update the area of one tile. If you had to do this frequently it would not be efficient (the Update tool requires a restart of the service) and you might need to go with a non-cached service or call ExportMapImage which forces the map to be drawn dynamically.

MapServer.GetVirtualCacheDirectory(defaultMapName,layerNumber);

TomLUX — Tue, 10 Jun 2008 08:48:04 GMT

I have problems getting the VirtualCache of an non-FUSED cached mapservice.

I'm well detecting that the layer is cached, but I'm always getting an empty "getVirtualCacheDirectory".

See below.

I'm using the java WebADF. Tested on versions 92 and 93rc1.

Thanks,

Tom

boolean layerCache = mapServerPort.hasLayerCache(mapName, mapLayerInfo.getLayerID());

String virtualPath = mapServerPort.getVirtualCacheDirectory(mapName, mapLayerInfo.getLayerID());

This returns:

layerCache = true;

virtualpath = "";

re: Deconstructing the map cache tiling scheme (Part II): Working with map caches programmatically

Jeff Whiston — Fri, 17 Oct 2008 18:18:12 GMT

Hello, I would like to make a map web site with Cache. I own 4 ArcGIS Servers Licenses I would like to perform the following: As a user asks a map, he gets the tiles from the four Arcgis Servers (Grid working system) so the user gets the map from four servers and not from one. This method better then working with one server. Is there a way to do it?