[Qgis-user] trouble adding a basemap from a WMTS source

[Kobben, Barend (UT-ITC)]

Stephen,

Note that if you ask for ant=y service in a CRS that is not the ‘native’ one for the service (which for WMTS is usually EPSG:3857, the ‘google’ Mercator), it fully depends on how that service is set up if it is able and “willing” to provide it in the requested CRS. You can find that out by checking the services metadata (eg for WMS and other OGC compatible ones by issueing a GetCapabilities request).

--
Barend Köbben


On 06/07/2022, 16:36, "Qgis-user on behalf of Stephen Sacks via Qgis-user" <qgis-user-bounces at lists.osgeo.org<mailto:qgis-user-bounces at lists.osgeo.org> on behalf of qgis-user at lists.osgeo.org<mailto:qgis-user at lists.osgeo.org>> wrote:

It turns out that my problem is not getting the map from New York's DOITT, but in re-projecting it from EPSG:900913 to the project's EPSG:2263.  If I leave it in EPSG:900913 it doesn't disappear.  But I worry that some trouble may result if my basemap has a different CRS from all the other layers.

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Original post (7/4/2022, 8:17 PM):
  My project CRS is EPSG:2263;  all 21 layers were created in this project with CRS   EPSG:2263  , which seems appropriate for a public park in Brooklyn, NY.  If I use Google Satellite Hybrid as basemap, everything looks to be in the right  place.  I would like to replace the Google basemap with one of many maps available from the New York City Department of Information Technology & Telecommunications (DOITT     https://maps.nyc.gov/tiles/#basemap-layers-wmts).   But after many tries, all I get is a totally blank layer.
   Here, in detail, is what I  have done:

1. right-click on WMS/WMTS in browser and choose New Connection
2. name box:  DOITT Monday
3. URL:  https://maps.nyc.gov/wmts/1.0.0/?REQUEST=getcapabilities
4. leave configuration default:  No Authentication
    leave HTTP and options blank
5. click OK
6. "DOITT Monday" appears as a new item in browser under WMS/WMTS
7.  there are 15 sub-items under  DOITT Monday.  The CRS for each of them is EPSG:900913 , although the DOITT web  page led me to expect 4326  or 3857
8. I drag one of them ("basemap") onto the map canvas; right-click on it and set its CRS to EPSG:2263.  The project CRS remains 2263.
9. I see a msg at the top of the canvas:  "Used a ballpark transform from EPSG:2263 to EPSG:900913"  , which seems to me to be the opposite of what I asked for
10.  the added layer appears totally blank.  Toggling its checkmark in the layer panel has no effect.  Zoom-to-layer makes the scale go to a nine-digit number.  Zoom to 1:100 has no effect.
11. I tried again, with a new, blank project, with project CRS set to EPSG:900913.  I added one layer by dragging "basemap" from "DOITT Monday" onto the canvas.  The canvas remained blank.  I added one small layer from my real project, transformed it to 900613, and "zoomed  to layer" so as to focus on part of my park.  My  layer appeared but still no visible basemap.

 What am I doing wrong?   Thanks for any advice.
          Steve


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