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Weird rendering of OSM for Guatemala
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Are you sure that's Guatemala in Central America? It looks more like an island somewhere in the southern Caribbean (especially given the border line bubbling around it labeled America/Puerto_Rico timezone). What latitude and longitude were you at?
As for the weird square ocean chop-off, I've been trying to fix that for years. Between the dingbats and vandals breaking coastline segments so the math doesn't work right, plus the peculiar way the osmcoastline utility segments the oceans into pieces that don't exceed maximum vertex counts, I've never gotten a completely correct ocean plotting. The brown splotch is probably a protected area or marine park; click on it to see what it is identified to be. Andrew, KA2DDO author of YAAC ________________________________________ From: [email protected] <[email protected]> on behalf of Eric H. Christensen via groups.io <wg3k@...> Sent: Saturday, April 5, 2025 11:00 PM To: [email protected] Subject: [yaac-users] Weird rendering of OSM for Guatemala I'm seeing a very strange rendering of OSM data for Guatemala. I looked at the OSM data and can't figure why it looks so strange (see attached). 73, Eric WG3K FM18rp Packet: WG3K@WG3K.#SMD.MD.USA.NOAM E-Mail: wg3k@... GPG: D5A62094161B8C5D2A13E96EBA220AE2C4D9A50E |
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The text in the image says it's the French West Indies, with Point-a-pitre being the central city. That island is otherwise known as Guadeloupe. KH6CP On Sat, Apr 5, 2025 at 5:00?PM Eric H. Christensen via <wg3k=[email protected]> wrote: I'm seeing a very strange rendering of OSM data for Guatemala.? I looked at the OSM data and can't figure why it looks so strange (see attached). |
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??♂?This is what happens when I try to compute too late at night. Of course Guadeloupe. ?
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73, Eric WG3K FM18rpPacket: WG3K@WG3K.#SMD.MD.USA.NOAM E-Mail: wg3k@... GPG: D5A62094161B8C5D2A13E96EBA220AE2C4D9A50E -------- Original Message --------
On 4/6/25 00:07, Andrew P. via groups.io <andrewemt@...> wrote: Are you sure that's Guatemala in Central America? It looks more like an island somewhere in the southern Caribbean (especially given the border line bubbling around it labeled America/Puerto_Rico timezone). What latitude and longitude were you at? |
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Well, this one is sure weird. I finally tracked it down to the OSM Relation#272896, the shoreline of Grande-Terre of Guadaloupe. For some reason (not seen elsewhere for islands in OSM), this shoreline is given a length and width, which is being rendered as the width of the beach along the shoreline, rather than as the length and width of the whole landmass. Since the width of the island is listed as 35000 meters, that draws the shoreline as a stripe that overlaps in the center of the island and extends beyond the coastline into the Caribbean Sea by 17500 meters (yes, over 10 statute miles). Hence the huge brown stain on the map that still has an irregular boundary (an amplified version of what the actual shoreline looks like).
I'm not sure how to fix this, except possibly ignoring OSM width values for shorelines and coastlines (assuming they are infinitely thin at the water's edge halfway between high and low tide). The boxed-out white area where there should be the Caribbean Sea is still my issues with the osmcoastline utility. I will take another try at fixing that when I bring in the latest snapshot of the OSM data and import it. Andrew, KA2DDO author of YAAC ________________________________________ From: [email protected] <[email protected]> on behalf of Eric H. Christensen via groups.io <wg3k@...> Sent: Sunday, April 6, 2025 10:23 AM To: [email protected] Subject: Re: [yaac-users] Weird rendering of OSM for Guatemala ??♂?This is what happens when I try to compute too late at night. Of course Guadeloupe. ? 73, Eric WG3K FM18rpPacket: WG3K@WG3K.#SMD.MD.USA.NOAM E-Mail: wg3k@... GPG: D5A62094161B8C5D2A13E96EBA220AE2C4D9A50E -------- Original Message -------- On 4/6/25 00:07, Andrew P. via groups.io <andrewemt@...> wrote: Are you sure that's Guatemala in Central America? It looks more like an island somewhere in the southern Caribbean (especially given the border line bubbling around it labeled America/Puerto_Rico timezone). What latitude and longitude were you at? |
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