Bay polygons points conversion
The if else is needed in my case because the option « add-pois-to-areas » adds at least one point for each polygon/multipolygon. For example, if a polygon is used to display a named hospital, you will then have also a point with the same name. As explained in the documentation, it makes possible to search the hospital. For Ireland, adding pois to polygons adds at least 3Mb more to the final img file. In Qmapshack, the name of extra POIs is displayed. With the if statement, I do not render bay polygon in polygons style file but I add a corresponding POI in points style file only for bays. This simple trick may need few lines in the documentation. But, I think the problem is that a bay is an inner part of something bigger (like an administrative area is a part of a country). As we do not render counties with a special polygon, bay should not be rendered because they are parts of ocean or sea with no really borders. Last point the style 0x3d chosen for bays is in Garmin Europe map and other Garmin products used for lakes with a size between 77 and 250 km2. 0x3b and 0x45 are known as to be blue like sea polygon and correspond to « unknown ». David
Hi David, not sure but it sounds like a missunderstanding. The --add-pois-to-areas option generates a node for each polygon, but the rules in the points file decide if a POI is added to the map for such a node. So, if you remove the natural=bay from the polygon rules there is no need to distinguish between generated natural=bay nodes or real OSM nodes with that tag. Gerd ________________________________________ Von: mkgmap-dev <mkgmap-dev-bounces@lists.mkgmap.org.uk> im Auftrag von David <david.tlp@orange.fr> Gesendet: Freitag, 20. Dezember 2019 17:06 An: mkgmap-dev@lists.mkgmap.org.uk Betreff: [mkgmap-dev] Bay polygons points conversion The if else is needed in my case because the option « add-pois-to-areas » adds at least one point for each polygon/multipolygon. For example, if a polygon is used to display a named hospital, you will then have also a point with the same name. As explained in the documentation, it makes possible to search the hospital. For Ireland, adding pois to polygons adds at least 3Mb more to the final img file. In Qmapshack, the name of extra POIs is displayed. With the if statement, I do not render bay polygon in polygons style file but I add a corresponding POI in points style file only for bays. This simple trick may need few lines in the documentation. But, I think the problem is that a bay is an inner part of something bigger (like an administrative area is a part of a country). As we do not render counties with a special polygon, bay should not be rendered because they are parts of ocean or sea with no really borders. Last point the style 0x3d chosen for bays is in Garmin Europe map and other Garmin products used for lakes with a size between 77 and 250 km2. 0x3b and 0x45 are known as to be blue like sea polygon and correspond to « unknown ». David _______________________________________________ mkgmap-dev mailing list mkgmap-dev@lists.mkgmap.org.uk http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
Hi David If I understand you correctly, you don't want duplication of an element as both a polygon and a POI, and, for all elements except 'bay', you want the polygon if define as such by OSM, but not the POI as well, but for 'bay', you want a POI only, regardless of it maybe being defined in OSM as a polygon. Assuming this is the case, then what you have is a way of doing it. Another would be something like, at the top of points: natural=bay [0x6503 resolution 18] mkgmap:area2poi=true {deletealltags} But: 1/ it seems strange that you single out bays for this treatment. 2/ searching by name and showing nearby POI will be very inconsistent, ie depend on if OSM defined them as a point or polygon 3/ 3mb is not much extra in an .img file Ticker On Fri, 2019-12-20 at 16:47 +0000, Gerd Petermann wrote:
Hi David,
not sure but it sounds like a missunderstanding. The --add-pois-to-areas option generates a node for each polygon, but the rules in the points file decide if a POI is added to the map for such a node. So, if you remove the natural=bay from the polygon rules there is no need to distinguish between generated natural=bay nodes or real OSM nodes with that tag.
Gerd
________________________________________ Von: mkgmap-dev <mkgmap-dev-bounces@lists.mkgmap.org.uk> im Auftrag von David <david.tlp@orange.fr> Gesendet: Freitag, 20. Dezember 2019 17:06 An: mkgmap-dev@lists.mkgmap.org.uk Betreff: [mkgmap-dev] Bay polygons points conversion
The if else is needed in my case because the option « add-pois-to -areas » adds at least one point for each polygon/multipolygon. For example, if a polygon is used to display a named hospital, you will then have also a point with the same name. As explained in the documentation, it makes possible to search the hospital. For Ireland, adding pois to polygons adds at least 3Mb more to the final img file. In Qmapshack, the name of extra POIs is displayed. With the if statement, I do not render bay polygon in polygons style file but I add a corresponding POI in points style file only for bays.
This simple trick may need few lines in the documentation.
But, I think the problem is that a bay is an inner part of something bigger (like an administrative area is a part of a country). As we do not render counties with a special polygon, bay should not be rendered because they are parts of ocean or sea with no really borders. Last point the style 0x3d chosen for bays is in Garmin Europe map and other Garmin products used for lakes with a size between 77 and 250 km2. 0x3b and 0x45 are known as to be blue like sea polygon and correspond to « unknown ».
David
_______________________________________________ mkgmap-dev mailing list mkgmap-dev@lists.mkgmap.org.uk http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev _______________________________________________ mkgmap-dev mailing list mkgmap-dev@lists.mkgmap.org.uk http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
Hi all, reg. search: I think Garmin maps allow to search for some polygons, but mkgmap doesn't add them to the global index. For the experts: The MDR file has groups >= 64 (or was it 0x64?) for named polygons, I think I saw that in at least one of the demo maps using display tool MdrDisplay. I did not dig into the details because probably everybody uses --add-pois-to-areas and thus we would just double the information in the index. Gerd ________________________________________ Von: mkgmap-dev <mkgmap-dev-bounces@lists.mkgmap.org.uk> im Auftrag von Ticker Berkin <rwb-mkgmap@jagit.co.uk> Gesendet: Freitag, 20. Dezember 2019 18:33 An: Development list for mkgmap Betreff: Re: [mkgmap-dev] Bay polygons points conversion Hi David If I understand you correctly, you don't want duplication of an element as both a polygon and a POI, and, for all elements except 'bay', you want the polygon if define as such by OSM, but not the POI as well, but for 'bay', you want a POI only, regardless of it maybe being defined in OSM as a polygon. Assuming this is the case, then what you have is a way of doing it. Another would be something like, at the top of points: natural=bay [0x6503 resolution 18] mkgmap:area2poi=true {deletealltags} But: 1/ it seems strange that you single out bays for this treatment. 2/ searching by name and showing nearby POI will be very inconsistent, ie depend on if OSM defined them as a point or polygon 3/ 3mb is not much extra in an .img file Ticker On Fri, 2019-12-20 at 16:47 +0000, Gerd Petermann wrote:
Hi David,
not sure but it sounds like a missunderstanding. The --add-pois-to-areas option generates a node for each polygon, but the rules in the points file decide if a POI is added to the map for such a node. So, if you remove the natural=bay from the polygon rules there is no need to distinguish between generated natural=bay nodes or real OSM nodes with that tag.
Gerd
________________________________________ Von: mkgmap-dev <mkgmap-dev-bounces@lists.mkgmap.org.uk> im Auftrag von David <david.tlp@orange.fr> Gesendet: Freitag, 20. Dezember 2019 17:06 An: mkgmap-dev@lists.mkgmap.org.uk Betreff: [mkgmap-dev] Bay polygons points conversion
The if else is needed in my case because the option « add-pois-to -areas » adds at least one point for each polygon/multipolygon. For example, if a polygon is used to display a named hospital, you will then have also a point with the same name. As explained in the documentation, it makes possible to search the hospital. For Ireland, adding pois to polygons adds at least 3Mb more to the final img file. In Qmapshack, the name of extra POIs is displayed. With the if statement, I do not render bay polygon in polygons style file but I add a corresponding POI in points style file only for bays.
This simple trick may need few lines in the documentation.
But, I think the problem is that a bay is an inner part of something bigger (like an administrative area is a part of a country). As we do not render counties with a special polygon, bay should not be rendered because they are parts of ocean or sea with no really borders. Last point the style 0x3d chosen for bays is in Garmin Europe map and other Garmin products used for lakes with a size between 77 and 250 km2. 0x3b and 0x45 are known as to be blue like sea polygon and correspond to « unknown ».
David
_______________________________________________ mkgmap-dev mailing list mkgmap-dev@lists.mkgmap.org.uk http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev _______________________________________________ mkgmap-dev mailing list mkgmap-dev@lists.mkgmap.org.uk http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
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participants (3)
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David -
Gerd Petermann -
Ticker Berkin