WMTS - Failed to obtain image

CesiumJS
1

Hi,

I’m very new to GIS. Please, bear with me.

I have been trying to add a WMTS layer to Cesium.

When i tried,

var viewer = new Cesium.Viewer(‘cesiumContainer’);
var provider = new Cesium.WebMapTileServiceImageryProvider({
url : ‘//maps.nlsc.gov.tw/S_Maps/wmts’,
layer : ‘EMAP8’,
style : ‘default’,
format : ‘image/jpeg’,
tileMatrixSetID : ‘GoogleMapsCompatible’,
proxy : new Cesium.DefaultProxy(’/proxy/’)
});
viewer.imageryLayers.addImageryProvider(provider);

It works fine. But,

var viewer = new Cesium.Viewer(‘cesiumContainer’);
var provider = new Cesium.WebMapTileServiceImageryProvider({
url : ‘//gis.sinica.edu.tw/tileserver/wmts’,
layer : ‘1956_Landuse’,
style : ‘default’,
format : ‘image/png’,
tileMatrixSetID : ‘GoogleMapsCompatible’,
proxy : new Cesium.DefaultProxy(’/proxy/’)
});
viewer.imageryLayers.addImageryProvider(provider);

and

var viewer = new Cesium.Viewer(‘cesiumContainer’);
var imageryLayers = viewer.imageryLayers;
imageryLayers.addImageryProvider(new Cesium.WebMapServiceImageryProvider({
url : ‘//maps.nlsc.gov.tw/S_Maps/wms’,
layers : ‘EMAP8’,
parameters : {
transparent : true,
format : ‘image/png’
},
proxy : new Cesium.DefaultProxy(’/proxy/’)
}));

throws error, ‘Failed to obtain image tile …’.
Why? Also, i was able to fetch the layers using another ‘GIS’ software.

Tried fixing it myself, but in vain. Anyone, who can help me out here please?

Thank you,
Monisha

2

Could any one help me with the second issue?

var viewer = new Cesium.Viewer(‘cesiumContainer’);
var imageryLayers = viewer.imageryLayers;
imageryLayers.addImageryProvider(new Cesium.WebMapServiceImageryProvider({
url : ‘//maps.nlsc.gov.tw/S_Maps/wms’,
layers : ‘EMAP8’,
parameters : {
transparent : true,
format : ‘image/png’
},
proxy : new Cesium.DefaultProxy(’/proxy/’)
}));

I tried passing parameters: version, service, request with no luck.

var viewer = new Cesium.Viewer(‘cesiumContainer’);
var provider = new Cesium.WebMapServiceImageryProvider({
url : '//maps.nlsc.gov.tw/S_Maps/wms?’,
layers : ‘EMAP2’,
parameters : {
VERSION : ‘1.1.1’,
service: ‘WMS’,
request:‘GetMap’,
transparent : ‘true’,
format : ‘image/png’
}
});
viewer.imageryLayers.addImageryProvider(provider);

-Monisha

3

Hi,

for your WMTS use, Cesium sends requests of that kind to the service :

http://gis.sinica.edu.tw/tileserver/wmts?service=WMTS&version=1.0.0&request=GetTile&tilematrix=4&layer=1956_Landuse&style=default&tilerow=4&tilecol=7&tilematrixset=GoogleMapsCompatible&format=image%2Fpng

and the response is a getcapabilities result, not an image. Can you compare with correct GetTile requests ?

4

Hi,

Thank you.

I was able to fetch the image using URL,

http://gis.sinica.edu.tw/tileserver/file-exists.php?img=1956_Landuse-png-{TileMatrix}-{TileCol}-{TileRow}

Now, the problem is with the second issue.

Monisha

5

Update:

‘//maps.nlsc.gov.tw/S_Maps/wms’ expects query string in CAPS (case sensitive). May seem weird, but,

http://maps.nlsc.gov.tw/S_Maps/wms?VERSION=1.1.1&SERVICE=WMS&REQUEST=GetMap&LAYERS=EMAP8&STYLES=&FORMAT=image/png&SRS=EPSG:4326&BBOX=115.5,19.5,125.0,27.0&WIDTH=800&HEIGHT=800 - WORKS

http://maps.nlsc.gov.tw/S_Maps/wms?version=1.1.1&service=WMS&request=GetMap&layers=EMAP8&styles=&format=image/png&srs=EPSG:4326&bbox=115.5,19.5,125.0,27.0&width=800&height=800 - FAILS

Also, the server serves tiles only form level 4. So, if level is 3 or less, it throws error, ‘Failed to obtain image tile …’

  • Monisha