Erica Fischer

Is this with `--coalesce-densest-as-needed` or plain `--coalesce`? If you do `--coalesce --reorder` all the features with exactly the same attributes should be merged together. It does seem like it would...

Can you provide a copy of the GeoJSON so I can try to figure out what is going wrong? If you are using `--detect-shared-borders` or especially `--no-line-simplification`, the discrepancies might...

`-zg` works from whatever the geographic density is in the input data, so if your smaller sample has denser or more detailed geometries than the full data, it will choose...

It does look like the gaps are being introduced during polygon cleanup with Wagyu. I don't see them with cleanup turned off. I think during snap rounding, line segments that...

So maybe the answer is a global snap-rounding pass in which *all* polygon edges get snapped to the nodes of any other features that they come close to.

`-zg` is based on the *average* precision of the features, not the *highest* precision, so it is not necessarily surprising that it changes when you change the sample. But if...

However what this suggests is that what you are looking for is for `-zg` to choose a zoom level high enough that no node within a feature is closer than...

Alternately, an `--extend-zooms-if-still-simplifying` would probably be more practical than trying to predict up front what will get snap-rounded.

Hmm, that doesn't really work, because Wagyu is still doing some amount of insertion of snap-rounded points into your geometries all the way to zoom level 14 (but apparently *not*...

Even just checking for snap rounding that happens within the tile proper (as opposed to in the buffer), continuing until there is no snapping keeps tiling far too deeply in...