Open sameersb opened 3 years ago
One more place, weird data Latitude: 44.483966, Longitude: -86.740183 Elevation Value 177m (correct) for zoom level except 5. Elevation Value -80m (wrong) for zoom level 5.
Can you give an example for each with a tile coordinate filename with zoom, x, y please? Above and below can be confusing when talking about zoom levels (and map scale in general).
Latitude: 44.483966, Longitude: -86.740183 correct: https://s3.amazonaws.com/elevation-tiles-prod/terrarium/6/16/23.png wrong: https://s3.amazonaws.com/elevation-tiles-prod/terrarium/5/8/11.png
Latitude: -78.996578, Longitude: 19.218528 correct: https://s3.amazonaws.com/elevation-tiles-prod/terrarium/4/8/13.png wrong: https://s3.amazonaws.com/elevation-tiles-prod/terrarium/5/17/27.png
Latitude: -24.728372, Longitude: 43.810335 correct: https://s3.amazonaws.com/elevation-tiles-prod/terrarium/10/636/584.png wrong: https://s3.amazonaws.com/elevation-tiles-prod/terrarium/11/1273/1169.png
Some comments:
Can you clarify what you mean by "wrong"? The elevation at a given pixel will always have some rounding errors thru the zoom ranges. Are you talking about it going from having a non-zero value to zero? Or infinite heights? Or within ±100m change in value from zoom to zoom?
Thanks nvkelso for your comments. The second example is from Antarctica. "wrong" means the pixel value itself is far different from zoom to zoom (difference is more than 100m) I can understand rounding errors but I found the errors are more than 100m as follow,
Latitude: 44.483966, Longitude: -86.740183
correct: 177m /6/16/23.png
wrong: -80m /5/8/11.png (Except zoom level 5, at all other zoom levels pixel value is correct)
Latitude: -78.996578, Longitude: 19.218528 (Antarctica) correct: 3208m /4/8/13.png wrong: 170m /5/17/27.png (Far difference in pixel value)
Latitude: -24.728372, Longitude: 43.810335 correct: -1782m /10/636/584.png wrong: 0m /11/1273/1169.png (I understand that this is due to coastline merge)
The tile /12/1135/1743.png in Florida, United State has totally wrong values. Also on zooming in that tile area, the many child tiles also has wrong values. Request to please check the issue.
The tile https://s3.amazonaws.com/elevation-tiles-prod/terrarium/11/483/850.png near Galveston, Texas, United State also has wrong values. Many nearby tiles also has wrong values.
The tile https://s3.amazonaws.com/elevation-tiles-prod/terrarium/11/483/850.png near Galveston, Texas, United State also has wrong values. Many nearby tiles also has wrong values.
Simply compare following two images with successive X position, they are completely different https://s3.amazonaws.com/elevation-tiles-prod/terrarium/11/482/850.png https://s3.amazonaws.com/elevation-tiles-prod/terrarium/11/483/850.png
There are many such tiles in the United States
Related marblecutter issue: https://github.com/mojodna/marblecutter/issues/73
Another example, For location with Latitude: 25.511027 Longitude: -97.829837 elevation is 13 at zoom level 10 and at zoom level 11, elevation is 7
We've narrowed this down to an issue with how the GeoTIFF overviews are created and passed to GDAL as VRTs. We're testing the fix, and are in discussions with AWS to do a new global build to make the fix available on S3.
That's really an excellent news... waiting eagerly....
We've narrowed this down to an issue with how the GeoTIFF overviews are created and passed to GDAL as VRTs. We're testing the fix, and are in discussions with AWS to do a new global build to make the fix available on S3.
Just wanted to know when is it expected to available on AWS? Thanks
We've narrowed this down to an issue with how the GeoTIFF overviews are created and passed to GDAL as VRTs. We're testing the fix, and are in discussions with AWS to do a new global build to make the fix available on S3.
@nvkelso kind request to make the fix available on S3
For many places, after certain zoom level, elevation value is wrong. Examples while using terrarium tiles,
Example 1: Latitude: -78.996578, Longitude: 19.218528 Elevation Value 3208m (correct) for zoom level 4 and below. Elevation Value 170m (wrong) for zoom level 5 and above.
Example 2: Latitude: -24.728372, Longitude: 43.810335 Elevation Value -1782m (correct) for zoom level 10 and below. Elevation Value 0m (wrong) for zoom level 11 and above.
Thanks & regards