[Geoserver-users] GeoWebCache custom grid

prushforth · July 6, 2019, 4:02pm

Hi,

I’m trying to create a custom grid, with the tile origin at the top left. The grid I’m making should match this definition tile for tile, I hope: https://geoappext.nrcan.gc.ca/arcgis/rest/services/BaseMaps/CBMT3978/MapServer

I created a grid with the GeoServer user interface, the geoWebCache.xml file is below, which i modified to have true, per the source definition.

However, I tried tiling the topp:states with that gridset, and I while the TileMatrixSet (from the capabilities) looks ok, the TileMatrixSetLink the doesn’t seem correct, because the MinTileRow / MaxTileRow and MinTileCol / MaxTileCol are always equal or the same cell value, regardless of zoom level, giving an extent of one cell wide by one cell high at every zoom level:

I include the TileMatrixSet element at the end, which looks ok to me. Does anyone have some advice on what I’ve got wrong here?

I should mention that I can only get the one tile available per MinTileRow / MaxTileRow and MinTileCol / MaxTileCol a GetTile request, all others return an error document.

Thanks very much for looking, and your advice!

Cheers,
Peter

CBMTILE

0

4

3

1

6

2

11

10

3

19

17

4

33

29

5

58

51

6

96

85

7

165

146

8

290

255

9

483

426

10

829

730

11

1381

1218

12

2321

2046

13

4002

3528

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6827

6019

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19345

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58036

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ows:IdentifierCBMTILE</ows:Identifier>

ows:SupportedCRSurn:ogc:def:crs:EPSG::3978</ows:SupportedCRS>

ows:Identifier0</ows:Identifier>

1.3701664308090523E8

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ows:Identifier1</ows:Identifier>

8.032010111639273E7

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ows:Identifier2</ows:Identifier>

4.7247118303760424E7

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ows:Identifier3</ows:Identifier>

2.8348270982256256E7

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ows:Identifier4</ows:Identifier>

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ows:Identifier5</ows:Identifier>

9449423.660752086

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ows:Identifier6</ows:Identifier>

5669654.196451251

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ows:Identifier7</ows:Identifier>

3307298.28126323

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ows:Identifier8</ows:Identifier>

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ows:Identifier10</ows:Identifier>

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ows:Identifier11</ows:Identifier>

396875.79375158757

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ows:Identifier12</ows:Identifier>

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ows:Identifier13</ows:Identifier>

137016.64308090523

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ows:Identifier14</ows:Identifier>

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ows:Identifier15</ows:Identifier>

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ows:Identifier16</ows:Identifier>

28348.270982256254

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ows:Identifier17</ows:Identifier>

16536.49140631615

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37674

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ows:Identifier18</ows:Identifier>

9449.423660752085

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65929

115615

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prushforth · July 6, 2019, 4:37pm

I forgot to say the version I’m using is built from the master branch with all the snapshot artifacts etc., so I hope that isnt why I ran into this. If so, apology for the wasted time.

Thanks
Peter

On Sat, Jul 6, 2019, 12:02 PM Peter Rushforth <peter.rushforth@anonymised.com> wrote:

Hi,

I’m trying to create a custom grid, with the tile origin at the top left. The grid I’m making should match this definition tile for tile, I hope: https://geoappext.nrcan.gc.ca/arcgis/rest/services/BaseMaps/CBMT3978/MapServer

I created a grid with the GeoServer user interface, the geoWebCache.xml file is below, which i modified to have true, per the source definition.

However, I tried tiling the topp:states with that gridset, and I while the TileMatrixSet (from the capabilities) looks ok, the TileMatrixSetLink the doesn’t seem correct, because the MinTileRow / MaxTileRow and MinTileCol / MaxTileCol are always equal or the same cell value, regardless of zoom level, giving an extent of one cell wide by one cell high at every zoom level:

I include the TileMatrixSet element at the end, which looks ok to me. Does anyone have some advice on what I’ve got wrong here?

I should mention that I can only get the one tile available per MinTileRow / MaxTileRow and MinTileCol / MaxTileCol a GetTile request, all others return an error document.

Thanks very much for looking, and your advice!

Cheers,
Peter

CBMTILE

0

4

4

3

3

1

6

6

6

6

2

11

11

10

10

3

19

19

17

17

4

33

33

29

29

5

58

58

51

51

6

96

96

85

85

7

165

165

146

146

8

290

290

255

255

9

483

483

426

426

10

829

829

730

730

11

1381

1381

1218

1218

12

2321

2321

2046

2046

13

4002

4002

3528

3528

14

6827

6827

6019

6019

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11607

11607

10232

10232

16

19345

19345

17054

17054

17

33163

33163

29237

29237

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58036

58036

51164

51164

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ows:SupportedCRSurn:ogc:def:crs:EPSG::3978</ows:SupportedCRS>

ows:Identifier0</ows:Identifier>

1.3701664308090523E8

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ows:Identifier1</ows:Identifier>

8.032010111639273E7

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ows:Identifier2</ows:Identifier>

4.7247118303760424E7

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256

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ows:Identifier3</ows:Identifier>

2.8348270982256256E7

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ows:Identifier4</ows:Identifier>

1.653649140631615E7

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256

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67

ows:Identifier5</ows:Identifier>

9449423.660752086

-3.46558E7 3.931E7

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256

66

116

ows:Identifier6</ows:Identifier>

5669654.196451251

-3.46558E7 3.931E7

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256

110

193

ows:Identifier7</ows:Identifier>

3307298.28126323

-3.46558E7 3.931E7

256

256

189

331

ows:Identifier8</ows:Identifier>

1889884.732150417

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256

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ows:Identifier9</ows:Identifier>

1133930.8392902503

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256

550

964

ows:Identifier10</ows:Identifier>

661459.656252646

-3.46558E7 3.931E7

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256

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1652

ows:Identifier11</ows:Identifier>

396875.79375158757

-3.46558E7 3.931E7

256

256

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2753

ows:Identifier12</ows:Identifier>

236235.59151880213

-3.46558E7 3.931E7

256

256

2638

4625

ows:Identifier13</ows:Identifier>

137016.64308090523

-3.46558E7 3.931E7

256

256

4547

7974

ows:Identifier14</ows:Identifier>

80320.10111639272

-3.46558E7 3.931E7

256

256

7757

13602

ows:Identifier15</ows:Identifier>

47247.11830376043

-3.46558E7 3.931E7

256

256

13186

23123

ows:Identifier16</ows:Identifier>

28348.270982256254

-3.46558E7 3.931E7

256

256

21977

38539

ows:Identifier17</ows:Identifier>

16536.49140631615

-3.46558E7 3.931E7

256

256

37674

66066

ows:Identifier18</ows:Identifier>

9449.423660752085

-3.46558E7 3.931E7

256

256

65929

115615
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Andrea_Aime4 · July 6, 2019, 5:27pm

Hi Peter,
I’m not sure, I’ve just tried with my current checkout of GeoServer, and I get increasing ranges,
see the caps document attached, retrieved calling http://localhost:8080/geoserver/topp/states/gwc/service/wmts?REQUEST=GetCapabilities

Wondering if maybe the states layer bbox got ruined in the configuration, and it’s a very small
one now? That would explain why a single tile always manages to cover it.

Cheers

Andrea

cbmtile_capabilities.xml (112 KB)

···

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