The crossOrigin attribute for loaded images.
Note that you must provide a crossOrigin value if you are using the WebGL renderer
or if you want to access pixel data with the Canvas renderer. See
https://developer.mozilla.org/en-US/docs/Web/HTML/CORS_enabled_image
for more detail.
params
Object.<string, *>
ArcGIS Rest parameters. This field is optional. Service defaults will be
used for any fields not specified. FORMAT is PNG32 by default. F is IMAGE by
default. TRANSPARENT is true by default. BBOX,SIZE,BBOXSR,
andIMAGESRwill be set dynamically. SetLAYERS` to
override the default service layer visibility. See
http://resources.arcgis.com/en/help/arcgis-rest-api/index.html#/Export_Map/02r3000000v7000000/
for further reference.
Tile grid. Base this on the resolutions,
tilesize and extent supported by the server.
If this is not defined, a default grid will be used: if there is a projection
extent, the grid will be based on that; if not, a grid based on a global
extent with origin at 0,0 will be used.