Bug report #8134

WMT-S doesn't draw an image if zoomed in beyond maximum tilematrix

Added by Jeremy Palmer about 6 years ago. Updated about 6 years ago.

Status:Closed
Priority:Normal
Assignee:Jürgen Fischer
Category:Web Services clients/WMS
Affected QGIS version:master Regression?:No
Operating System:ALL Easy fix?:No
Pull Request or Patch supplied:No Resolution:invalid
Crashes QGIS or corrupts data:No Copied to github as #:16964

Description

We are developing a new WMTS service and have found QGIS tries to request tiles for levels lower than supported in the GC TileMatrix. I have tested this in ArcMap(!) 10.1 and it works by resampling the lowest provided tiles as you zoom in.

With one of our EPSG:3857 tilesets one we zoom in beyond a scale of 1:1690 and nothing displays on the map canvas. This is because QGIS requests tiles that do not exists. e.g

...EPSG:3857/20/516713/328293.png - return HTTP 404 where level 19 is the highest supported.

I can provide URLs to our testing site via private email if required (once testing is finished it will be freely available on http://data.linz.govt.nz).

Here's the relevant part of the GC doc:

<TileMatrixSetLink>
<TileMatrixSet>EPSG:3857</TileMatrixSet>
</TileMatrixSetLink>
<ResourceURL format="image/png" resourceType="tile" template="http://xxxxxx/tiles/v4/layer=552,{style}/{TileMatrixSet}/{TileMatrix}/{TileCol}/{TileRow}.png"/>
<ResourceURL format="application/json" resourceType="FeatureInfo" template="http://xxxxxx/wmts/1.0.0/layer/552/featureinfo/{TileMatrixSet}/{TileMatrix}/{TileCol}/{TileRow}.json"/>
<ResourceURL format="text/html" resourceType="FeatureInfo" template="http://xxxxxx/wmts/1.0.0/layer/552/featureinfo/{TileMatrixSet}/{TileMatrix}/{TileCol}/{TileRow}.html"/>
</Layer>
<TileMatrixSet>
<ows:Title>GoogleMapsCompatible</ows:Title>
<ows:Abstract>
The well-known 'GoogleMapsCompatible' tile matrix set defined by the OGC WMTS specification
</ows:Abstract>
<ows:Identifier>EPSG:3857</ows:Identifier>
<ows:SupportedCRS>urn:ogc:def:crs:EPSG:6.18:3:3857</ows:SupportedCRS>
<WellKnownScaleSet>urn:ogc:def:wkss:OGC:1.0:GoogleMapsCompatible</WellKnownScaleSet>
<TileMatrix>
<ows:Identifier>0</ows:Identifier>
<ScaleDenominator>559082264.0287178</ScaleDenominator>
<TopLeftCorner>-20037508.34278925 20037508.34278925</TopLeftCorner>
<TileWidth>256</TileWidth>
<TileHeight>256</TileHeight>
<MatrixWidth>1</MatrixWidth>
<MatrixHeight>1</MatrixHeight>
</TileMatrix>
<TileMatrix>
<ows:Identifier>1</ows:Identifier>
<ScaleDenominator>279541132.0143589</ScaleDenominator>
<TopLeftCorner>-20037508.34278925 20037508.34278925</TopLeftCorner>
<TileWidth>256</TileWidth>
<TileHeight>256</TileHeight>
<MatrixWidth>2</MatrixWidth>
<MatrixHeight>2</MatrixHeight>
</TileMatrix>
<TileMatrix>
<ows:Identifier>2</ows:Identifier>
<ScaleDenominator>139770566.0071794</ScaleDenominator>
<TopLeftCorner>-20037508.34278925 20037508.34278925</TopLeftCorner>
<TileWidth>256</TileWidth>
<TileHeight>256</TileHeight>
<MatrixWidth>4</MatrixWidth>
<MatrixHeight>4</MatrixHeight>
</TileMatrix>
<TileMatrix>
<ows:Identifier>3</ows:Identifier>
<ScaleDenominator>69885283.00358972</ScaleDenominator>
<TopLeftCorner>-20037508.34278925 20037508.34278925</TopLeftCorner>
<TileWidth>256</TileWidth>
<TileHeight>256</TileHeight>
<MatrixWidth>8</MatrixWidth>
<MatrixHeight>8</MatrixHeight>
</TileMatrix>
<TileMatrix>
<ows:Identifier>4</ows:Identifier>
<ScaleDenominator>34942641.50179486</ScaleDenominator>
<TopLeftCorner>-20037508.34278925 20037508.34278925</TopLeftCorner>
<TileWidth>256</TileWidth>
<TileHeight>256</TileHeight>
<MatrixWidth>16</MatrixWidth>
<MatrixHeight>16</MatrixHeight>
</TileMatrix>
<TileMatrix>
<ows:Identifier>5</ows:Identifier>
<ScaleDenominator>17471320.75089743</ScaleDenominator>
<TopLeftCorner>-20037508.34278925 20037508.34278925</TopLeftCorner>
<TileWidth>256</TileWidth>
<TileHeight>256</TileHeight>
<MatrixWidth>32</MatrixWidth>
<MatrixHeight>32</MatrixHeight>
</TileMatrix>
<TileMatrix>
<ows:Identifier>6</ows:Identifier>
<ScaleDenominator>8735660.375448715</ScaleDenominator>
<TopLeftCorner>-20037508.34278925 20037508.34278925</TopLeftCorner>
<TileWidth>256</TileWidth>
<TileHeight>256</TileHeight>
<MatrixWidth>64</MatrixWidth>
<MatrixHeight>64</MatrixHeight>
</TileMatrix>
<TileMatrix>
<ows:Identifier>7</ows:Identifier>
<ScaleDenominator>4367830.187724357</ScaleDenominator>
<TopLeftCorner>-20037508.34278925 20037508.34278925</TopLeftCorner>
<TileWidth>256</TileWidth>
<TileHeight>256</TileHeight>
<MatrixWidth>128</MatrixWidth>
<MatrixHeight>128</MatrixHeight>
</TileMatrix>
<TileMatrix>
<ows:Identifier>8</ows:Identifier>
<ScaleDenominator>2183915.093862179</ScaleDenominator>
<TopLeftCorner>-20037508.34278925 20037508.34278925</TopLeftCorner>
<TileWidth>256</TileWidth>
<TileHeight>256</TileHeight>
<MatrixWidth>256</MatrixWidth>
<MatrixHeight>256</MatrixHeight>
</TileMatrix>
<TileMatrix>
<ows:Identifier>9</ows:Identifier>
<ScaleDenominator>1091957.546931089</ScaleDenominator>
<TopLeftCorner>-20037508.34278925 20037508.34278925</TopLeftCorner>
<TileWidth>256</TileWidth>
<TileHeight>256</TileHeight>
<MatrixWidth>512</MatrixWidth>
<MatrixHeight>512</MatrixHeight>
</TileMatrix>
<TileMatrix>
<ows:Identifier>10</ows:Identifier>
<ScaleDenominator>545978.7734655447</ScaleDenominator>
<TopLeftCorner>-20037508.34278925 20037508.34278925</TopLeftCorner>
<TileWidth>256</TileWidth>
<TileHeight>256</TileHeight>
<MatrixWidth>1024</MatrixWidth>
<MatrixHeight>1024</MatrixHeight>
</TileMatrix>
<TileMatrix>
<ows:Identifier>11</ows:Identifier>
<ScaleDenominator>272989.3867327723</ScaleDenominator>
<TopLeftCorner>-20037508.34278925 20037508.34278925</TopLeftCorner>
<TileWidth>256</TileWidth>
<TileHeight>256</TileHeight>
<MatrixWidth>2048</MatrixWidth>
<MatrixHeight>2048</MatrixHeight>
</TileMatrix>
<TileMatrix>
<ows:Identifier>12</ows:Identifier>
<ScaleDenominator>136494.6933663862</ScaleDenominator>
<TopLeftCorner>-20037508.34278925 20037508.34278925</TopLeftCorner>
<TileWidth>256</TileWidth>
<TileHeight>256</TileHeight>
<MatrixWidth>4096</MatrixWidth>
<MatrixHeight>4096</MatrixHeight>
</TileMatrix>
<TileMatrix>
<ows:Identifier>13</ows:Identifier>
<ScaleDenominator>68247.34668319309</ScaleDenominator>
<TopLeftCorner>-20037508.34278925 20037508.34278925</TopLeftCorner>
<TileWidth>256</TileWidth>
<TileHeight>256</TileHeight>
<MatrixWidth>8192</MatrixWidth>
<MatrixHeight>8192</MatrixHeight>
</TileMatrix>
<TileMatrix>
<ows:Identifier>14</ows:Identifier>
<ScaleDenominator>34123.67334159654</ScaleDenominator>
<TopLeftCorner>-20037508.34278925 20037508.34278925</TopLeftCorner>
<TileWidth>256</TileWidth>
<TileHeight>256</TileHeight>
<MatrixWidth>16384</MatrixWidth>
<MatrixHeight>16384</MatrixHeight>
</TileMatrix>
<TileMatrix>
<ows:Identifier>15</ows:Identifier>
<ScaleDenominator>17061.83667079827</ScaleDenominator>
<TopLeftCorner>-20037508.34278925 20037508.34278925</TopLeftCorner>
<TileWidth>256</TileWidth>
<TileHeight>256</TileHeight>
<MatrixWidth>32768</MatrixWidth>
<MatrixHeight>32768</MatrixHeight>
</TileMatrix>
<TileMatrix>
<ows:Identifier>16</ows:Identifier>
<ScaleDenominator>8530.918335399136</ScaleDenominator>
<TopLeftCorner>-20037508.34278925 20037508.34278925</TopLeftCorner>
<TileWidth>256</TileWidth>
<TileHeight>256</TileHeight>
<MatrixWidth>65536</MatrixWidth>
<MatrixHeight>65536</MatrixHeight>
</TileMatrix>
<TileMatrix>
<ows:Identifier>17</ows:Identifier>
<ScaleDenominator>4265.459167699568</ScaleDenominator>
<TopLeftCorner>-20037508.34278925 20037508.34278925</TopLeftCorner>
<TileWidth>256</TileWidth>
<TileHeight>256</TileHeight>
<MatrixWidth>131072</MatrixWidth>
<MatrixHeight>131072</MatrixHeight>
</TileMatrix>
<TileMatrix>
<ows:Identifier>18</ows:Identifier>
<ScaleDenominator>2132.729583849784</ScaleDenominator>
<TopLeftCorner>-20037508.34278925 20037508.34278925</TopLeftCorner>
<TileWidth>256</TileWidth>
<TileHeight>256</TileHeight>
<MatrixWidth>262144</MatrixWidth>
<MatrixHeight>262144</MatrixHeight>
</TileMatrix>
<TileMatrix>
<ows:Identifier>19</ows:Identifier>
<ScaleDenominator>1066.364791925</ScaleDenominator>
<TopLeftCorner>-20037508.34278925 20037508.34278925</TopLeftCorner>
<TileWidth>256</TileWidth>
<TileHeight>256</TileHeight>
<MatrixWidth>524288</MatrixWidth>
<MatrixHeight>524288</MatrixHeight>
</TileMatrix>
<TileMatrix>
<ows:Identifier>20</ows:Identifier>
<ScaleDenominator>1066.364791925</ScaleDenominator>
<TopLeftCorner>-20037508.34278925 20037508.34278925</TopLeftCorner>
<TileWidth>256</TileWidth>
<TileHeight>256</TileHeight>
<MatrixWidth>1048576</MatrixWidth>
<MatrixHeight>1048576</MatrixHeight>
</TileMatrix>
</TileMatrixSet>

History

#1 Updated by Jürgen Fischer about 6 years ago

But there is a TileMatrix 20 in the capabilities, but it has the same scale dominator as 19. So I guess it's undefined which TileMatrix to use at the highest scale.

#2 Updated by Jeremy Palmer about 6 years ago

  • Resolution set to invalid

Ah thanks. That will be the problem. Sorry. I will contact our service devs.

#3 Updated by Jürgen Fischer about 6 years ago

  • Status changed from Open to Closed

Also available in: Atom PDF