questions for imodeljs

[paprophet]

1.now the map in imodeljs is bing map,i want load local map data from local server ,format is tif 、tmp 、 jpg
2.change by iTwin Snapshot， in revit ,the Geographical coordinates must set Latitude and longitude ,but some time the revit file set value in Project base point (and the value have other Coordinate system)

about second question the Project base point pic like is :

[pmconne]

iModel.js cannot know how to query your local map server or interpret its data. Consider writing a TiledGraphicsProvider.

Please post separate topics for the other questions, ideally providing more details than you have provided here.