maptalks / maptalks/raster-collection
天地图的Projection不是EPSG:4326
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Description
天地图的投影坐标系应该是cgcs2000，与EPSG:4326的差别在于，cgcs2000是从第1级开始切2张瓦片，EPSG:4326是从第0级切两张瓦片：
| zoom | cgcs2000 | EPSG:4326 |
|---|---|---|
| 0 | 无 | 1 x 2 |
| 1 | 1 x 2 | 2 x 4 |
| 2 | 2 x 4 | 4 x 8 |
| ... | ... | ... |
当在leaflet中初始化map的时候使用L.CRS.EPSG4326，直接加载天地图的瓦片是无法正确加载的，得设置zoomOffset: 1.
另外，现在天地图的域名发生了变化，而且需要申请token。
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Research direction
No source file or test is named. Start by locating the Tianditu tile-service configuration and the Leaflet map initialization, then compare its CRS and zoom handling with the CGCS2000 tile levels described here. Done should include correct tile loading without an inappropriate EPSG:4326 offset and account for the changed domain and token requirement.
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Assessment
- Domain
- frontend
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100