[OpenLayers-Dev] Strange behaviour in Layer.XYZ

[Alexei Peters]

I've used this patch submited by tschaub with good success:

http://trac.openlayers.org/browser/sandbox/tschaub/arcgiscache/lib/OpenLayers/Layer/ArcGISCache.js?rev=9918

<http://trac.openlayers.org/browser/sandbox/tschaub/arcgiscache/lib/OpenLayers/Layer/ArcGISCache.js?rev=9918>
Cheers,
Alexei

On Tue, Jun 1, 2010 at 5:33 PM, Robert Sanson <SansonR at asurequality.com>wrote:

>  Tiles I request from an ArcGIS Server tile cache using Layer.XYZ are not
> lining up with other layers requested from the same server via Layer.WMS or
> Layer.ArcGIS93Rest.
>
> Here is my code snippet:
>
> var mapoptions = {
>   //tileOrigin: new OpenLayers.LonLat(-4020900,19998100), //Origin as
> reported by ArcGIS
>     maxExtent: new OpenLayers.Bounds(-4020900, 4674128.11975,
> 2568710.79993, 19998100), //contains the AGS origin
>     restrictedExtent: new OpenLayers.Bounds(1018697.71047, 4674128.11975,
> 2568710.79993, 6296981.53325),
>     resolutions: new Array(3175.0063500127, 793.751587503175,
> 264.583862501058, 198.437896875794, 132.291931250529, 66.1459656252646,
> 26.4583862501058, 19.8437896875794, 13.2291931250529, 9.26043518753704,
> 6.61459656252646, 5.29167725002117, 3.96875793751588, 2.64583862501058,
> 1.98437896875794, 1.32291931250529),
>     tileSize: new OpenLayers.Size(256,256),
>     units: 'm',
>     projection: new OpenLayers.Projection('EPSG:2193'),
>     fractionalZoom: false
> };
> var map = new OpenLayers.Map( 'map',mapoptions );
> var nzcoastwms = new OpenLayers.Layer.WMS( "Coastline",
>                           "
> http://ws-esrimt/arcgis/services/mapservice_asurequality_prod/MapServer/WMSServer
> ",
>                           {layers: ['0'], format: "image/png"},
>                           {isBaseLayer: true, singleTile:true, visibility:
> true,
>                            attribution:"LINZ data Crown copyright
> reserved"} );
> var topoxyz = new OpenLayers.Layer.XYZ( "Topo",
>                     "
> http://ws-esrimt/ArcGIS/rest/services/mapservice_topography_vector_prod/MapServer/tile/${z}/${y}/${x<http://ws-esrimt/ArcGIS/rest/services/mapservice_topography_vector_prod/MapServer/tile/$%7Bz%7D/$%7By%7D/$%7Bx>
> }",
>                    {isBaseLayer: false, sphericalMercator: false//,
> tileOrigin: new OpenLayers.LonLat(-4020900,19998100)
> });
> map.addLayers([nzcoastwms,topoxyz]);
>
> Doing this above, requests the correct tiles, but it seems the requested
> tiles are displaced in a north-south direction, depending on Zoom level. I
> have previously verified the WMS layer is in the correct location. All the
> data and the map are in NZ Transverse Mercator (EPSG:2193), so there is no
> projection.
>
> Here are some numbers to show the problem based on relative locations of
> the same features on the map:
> Layer zoom res pixel.x pixel.y x y relative px relative y (m) displacement
> WMS 0 3175.00635 328 207 2022304.713 5641130.138
> XYZ 0 3175.00635 328 168 2022304.713 5764955.385 -39 123825.25 North
>
> WMS 1 793.7515875 219 265 1764335.447 5478411.062
> XYZ 1 793.7515875 219 370 1764335.447 5395067.146 105 -83343.92 South
>
> WMS 2 264.5838625 148 284 1765129.198 5478146.478
> XYZ 2 264.5838625 148 344 1765129.198 5462271.447 60 -15875.03 South
>
> WMS 3 198.4378969 97 289 1762152.63 5479006.376
> XYZ 3 198.4378969 97 199 1762152.63 5496865.787 -90 17859.41 North
>
> WMS 4 132.2919313 155 235 1762218.776 5479204.814
> XYZ 4 132.2919313 155 358 1762218.776 5462932.906 123 -16271.91 South
>
> WMS 5 66.14596563 121 273 1757522.412 5473317.823
> XYZ 5 66.14596563 121 262 1757522.412 5473979.283 -11 661.46 North
>
> WMS 6 26.45838625 103 307 1757509.183 5473317.823
> XYZ 6 26.45838625 103 408 1757509.183 5470645.526 101 -2672.30 South
>
> Is this a bug?
>
> Thanks,
>
> Robert Sanson
>
>
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>
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