Hi Adriaan,
Could you give an example?
Just visually, the map tile looks fine when flipping between https://api.gbif.org/v2/map/occurrence/density/6/65/13@2x.png?srs=EPSG:4326&... and https://api.gbif.org/v2/map/occurrence/density/6/65/13@2x.png?srs=EPSG:4326&...
Zooming in one step to the top right (which is only Dutch territory) and comparing the vector tiles with and without the country mask:
https://api.gbif.org/v2/map/occurrence/density/7/131/26.mvt?srs=EPSG:4326&am...
https://api.gbif.org/v2/map/occurrence/density/7/131/26.mvt?srs=EPSG:4326&am...
These are byte-for-byte identical.
I don't see a problem in EPSG:3575 either, e.g. with https://api.gbif.org/v2/map/occurrence/density/5/15/23@2x.png?srs=EPSG:3575&...
Note that close to borders, GBIF's processing assumes the source data is correct as we know our map isn't perfect. An observation in Westerwoldse Aa on the border of Netherlands and Germany could be accepted with either country=NL or country=DE, and would show accordingly if the map is clipped to NL or DE.
For the other approach, I don't have EPSG:3575-format vector tiles with country borders, but in any case it's difficult to work with vector tiles for any further processing — if you wanted a polygon, you'd need to reconstruct it from the lines which are cut off at the edges of the tiles. I recommend you use a different source of map data, e.g. from http://www.naturalearthdata.com/ . Many GIS libraries (including Javascript ones for display) should be able to work with that data, for example in GeoJSON format: https://github.com/nvkelso/natural-earth-vector/tree/master/geojson (if 10m resolution is sufficient).
Cheers,
Matt Blissett
On 08/01/2019 22:19, Adriaan van Os wrote:
I noticed that e.g. "&country=NL" limits occurrence data even within the specified country. That is, for that country, I get less occurrence data than without the "&country=NL"
Is this caused by wrong data, by data with the wrong (or no) country identifier attached ?
Anyway, I now seek another solution, which is to clip the occurrence data to the specified country on the map. However, how do I get map data tiles with country borders ? I use EPSG:3575.
Regards,
Adriaan van Os _______________________________________________ API-users mailing list API-users@lists.gbif.org https://lists.gbif.org/mailman/listinfo/api-users