na9da
commented
1 year ago This happens because the esri source is in EPSG:7844 CRS. When trying to compute the extent for a MapServer item, we need to convert the extent from the source CRS to destination CRS (which is hardcoded as EPSG:4326).
EPSG:7844 is not defined in our proj4 definitions file, so the extent information from the server is ignored altogether.
The CRS conversion is a complicated topic but an easy fix is to define EPSG:7844 as +proj=longlat +ellps=GRS80 +no_defs +type=crs in Terria.
Using e.g. the Transmission Lines layer in NatMap:
https://nationalmap.gov.au/#share=s-sSnPL1c2uOvNEW9F2eP7Xo50Vj
Clicking the Ideal Zoom button moves the map to the ideal zoom for the layer.
However, if you take the URL:
https://services.ga.gov.au/gis/rest/services/Foundation_Electricity_Infrastructure/MapServer
And add it through Add Web Data:
https://nationalmap.gov.au/#share=s-qocoeehV6CtYPlGwrsHVDZOHqvO
Clicking the Ideal Zoom button now does nothing, and no error or other message is logged in the console.
Testing this same thing with a WMS service, e.g.:
https://services.ga.gov.au/gis/services/Foundation_Electricity_Infrastructure/MapServer/WMSServer?request=GetCapabilities&service=WMS
When adding this through Add Web Data, adding the Transmission Lines layer and then clicking Ideal Zoom it works fine.