Ik help een collega met een kleine leaflet-applicatie. We lopen tegen problemen aan bij het proberen toe te voegen van onze eigen basemap-service met behulp van de 'L.tiledMapLayer' methode. Ik vermoed dat het probleem bij onze kaartservice ligt, maar we gebruiken deze service succesvol in verschillende aangepaste javascript-toepassingen, evenals andere ESRI en GeoCortex-toepassingen. <\/P>
Bij gebruik van een ESRI basemap-URL lijkt het goed te werken:<\/P>
<\/P>
L.esri.tiledMapLayer({ url: "<\/SPAN>http:\/\/services.arcgisonline.com\/arcgis\/rest\/services\/World_Topo_Map\/MapServer<\/A>"<\/SPAN>}).addTo(map);<\/P> <\/P>Echter, wanneer we de ESRI URL vervangen door onze eigen (niet-beveiligde en openbaar toegankelijke) tiled service, wordt de basemap niet weergegeven en tonen de ontwikkelaarstools een hoop 404 Not found fouten voor de tegels.<\/P> <\/P>L.esri.tiledMapLayer({ url: "<\/SPAN>https:\/\/maps2.tucsonaz.gov\/arcgis\/rest\/services\/BaseMaps\/gisBaseMap_Topo\/MapServer<\/A>"<\/SPAN>}).addTo(map);<\/P> <\/P>Ik vraag me af of dit een instelling is binnen onze service, zodat het in de huidige configuratie niet werkt met Leaflet?<\/P> <\/P>Bedankt - <\/P>Allen<\/P>
there were a few different things going on causing problems.
1. your own service doesn't support making CORS requests. thats okay, but its necessary for you to pass through `useCors: false` in your own constructor
2. even though your service advertises itself as wkid: 3857, its actually using a custom XY for its origin, which is problematic when the internal API attempts to translate the global LODs the service is missing.
3. there was a bug in esri-leaflet that led to us attempting to override custom LODs provided in code when we recognized the coordinate system as web mercator. (i fixed that here and published v2.1.2).
all that said, in our latest release, we display the service correctly, but its still up to you to describe the custom projection in your own code.
<SPAN class="keyword token">var</SPAN> crs <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">L<SPAN class="punctuation token">.</SPAN>Proj<SPAN class="punctuation token">.</SPAN>CRS</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">"EPSG:3857"</SPAN><SPAN class="punctuation token">,</SPAN><SPAN class="string token">"+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs"</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="punctuation token">{</SPAN> origin<SPAN class="punctuation token">:</SPAN> <SPAN class="punctuation token">[</SPAN><SPAN class="operator token">-</SPAN><SPAN class="number token">20037700</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">30241100</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="comment token">// your origin is custom</SPAN> resolutions<SPAN class="punctuation token">:</SPAN> <SPAN class="punctuation token">[</SPAN> <SPAN class="number token">611.4962262813797</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="comment token">// you are missing some smaller scale LODS as well</SPAN> <SPAN class="number token">305.74811314055756</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">152.87405657041106</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="comment token">// ...</SPAN> <SPAN class="punctuation token">]</SPAN> <SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN> <SPAN class="keyword token">var</SPAN> map <SPAN class="operator token">=</SPAN> L<SPAN class="punctuation token">.</SPAN><SPAN class="token function">map</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">'map'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="punctuation token">{</SPAN> crs<SPAN class="punctuation token">:</SPAN> crs <SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">.</SPAN><SPAN class="token function">setView</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">[</SPAN><SPAN class="number token">32.2217</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="operator token">-</SPAN><SPAN class="number token">110.926</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">2</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN> L<SPAN class="punctuation token">.</SPAN>esri<SPAN class="punctuation token">.</SPAN><SPAN class="token function">tiledMapLayer</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">{</SPAN> url<SPAN class="punctuation token">:</SPAN> <SPAN class="string token"><SPAN>'</SPAN><A class="jive-link-external-small" href="https://community.esri.com/external-link.jspa?url=https%3A%2F%2Fmaps2.tucsonaz.gov%2Farcgis%2Frest%2Fservices%2FBaseMaps%2FgisBaseMap_Topo%2FMapServer" target="_blank">https://maps2.tucsonaz.gov/arcgis/rest/services/BaseMaps/gisBaseMap_Topo/MapServer</A><SPAN>'</SPAN></SPAN><SPAN class="punctuation token">,</SPAN> useCors<SPAN class="punctuation token">:</SPAN> <SPAN class="keyword token">false</SPAN> <SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">.</SPAN><SPAN class="token function">addTo</SPAN><SPAN class="punctuation token">(</SPAN>map<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN><SPAN class="line-numbers-rows"><SPAN></SPAN><SPAN></SPAN><SPAN></SPAN><SPAN></SPAN><SPAN></SPAN><SPAN></SPAN><SPAN></SPAN><SPAN></SPAN><SPAN></SPAN><SPAN></SPAN><SPAN></SPAN><SPAN></SPAN><SPAN></SPAN><SPAN></SPAN><SPAN></SPAN><SPAN></SPAN></SPAN>
live sample: http://jsbin.com/yovezox/edit?html,output
(based on the sample in our documentation here)
my pleasure. to answer your follow up question, no. i'd expect the workflow you describe above to result in a published service CRS that is identical to Google/Bing/ArcGIS Online.
https://services.arcgisonline.com/arcgis/rest/services/World_Topo_Map/MapServer
John - Many thanks for looking in to this and the detailed response. This works well, and has helped us understand some implications of our basemap-building decisions.
So just to clarify - the source data used to build our basemap is in our local State Plane system but we make the data frame Web Mercator (without re-projecting the individual feature classes) in order to make it more friendly in web applications. This is what creates the need for the extra coding within leaflet, correct?
Allen
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