Re: [mapserver-users] the lines one above other
Lars, Thanx in any event for devoting your attention. Vladimir, I see, so you do not need the order of the LAYERS but the order of the FEATURES. I did not understand that correctly at first, sorry. In that case, I guess Andreas approach would be the one. Best Lars ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
Re: [mapserver-users] the lines one above other
Hi,
With OSM and Mapnik it is a two phase process. First osm2pgsql tries to
generate sensible z-index values and then Mapnik makes “order by” queries to
the database. The queries are here
https://github.com/gravitystorm/openstreetmap-carto/blob/master/project.yaml
and as an example
(SELECT way,
COALESCE((
'highway_' || (CASE WHEN highway IN ('residential', 'unclassified',
'pedestrian', 'service', 'footway', 'cycleway', 'track', 'path', 'platform')
THEN highway ELSE NULL END)),
('railway_' || (CASE WHEN railway IN ('platform') THEN railway ELSE NULL END))
) AS feature
FROM planet_osm_polygon
WHERE highway IN ('residential', 'unclassified', 'pedestrian', 'service',
'footway', 'track', 'path', 'platform')
OR railway IN ('platform')
ORDER BY z_order, way_area DESC
) AS highway_area_casing
-Jukka Rahkonen-
Vladimir wrote:
Bobb
Thanks you very much for detailed answer.
I'll have to place the parts of lines in various layers.
There is no other elegant decision as i understood, but I wonder how
web-map-giants like GOOGLE or OSM get out of this scrape.
Vladimir,
I’ve faked this in the past by drawing the same layer many times in one pass
(inside of the same mapfile), you need at least one complete layer pass, with
other partial layers for the over/under situations. You can do the partial
layer grouping with attributes on the segments that need to go under or over,
and this is a manual process for the most part, but it’s a real pain to keep
that up to date over time (I’m talking over years) . I could probably find a
programmer that thought of this as a challenge, but you still need a human to
decide what is over something else as a last QA.
The much harder task is defining which layers (partial segments are over/under
other layers.. You need to remove some line segments form at least one of the
layers in order to make things display correctly. Sometimes a layer is over,
sometime it’s under. I actually have two instances in my mapping system, where
I have three different bridges stacked on top of each other, two of them a
roadways, with the odd one in between them. The other has a Railway bridge
over a roadway bridge crossing.
The z-index stuff has always been a painful thing thing to keep updated, but it
is doable.
I’ve rencetly been looking at this myself for hardcopy pringing purposes. As
well.
Bobb
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Re: [mapserver-users] the lines one above other
Bobb Thanks you very much for detailed answer. I'll have to place the parts of lines in various layers. There is no other elegant decision as i understood, but I wonder how web-map-giants like GOOGLE or OSM get out of this scrape. Vladimir, I’ve faked this in the past by drawing the same layer many times in one pass (inside of the same mapfile), you need at least one complete layer pass, with other partial layers for the over/under situations. You can do the partial layer grouping with attributes on the segments that need to go under or over, and this is a manual process for the most part, but it’s a real pain to keep that up to date over time (I’m talking over years) . I could probably find a programmer that thought of this as a challenge, but you still need a human to decide what is over something else as a last QA. The much harder task is defining which layers (partial segments are over/under other layers.. You need to remove some line segments form at least one of the layers in order to make things display correctly. Sometimes a layer is over, sometime it’s under. I actually have two instances in my mapping system, where I have three different bridges stacked on top of each other, two of them a roadways, with the odd one in between them. The other has a Railway bridge over a roadway bridge crossing. The z-index stuff has always been a painful thing thing to keep updated, but it is doable. I’ve rencetly been looking at this myself for hardcopy pringing purposes. As well. Bobb ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
Re: [mapserver-users] the lines one above other
There is question about placing the parts of lines in various layers. I added the small part of line above the highway with linecap=butt for stops the line exactly at the end as described in http://mapserver.org/mapfile/symbology/construction.html#linecap. But butts of the line has some thin border, please see the pic: http://s8.postimg.org/iymc3az9h/linecap_butt.jpg How to escape this? Thanx. ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
[mapserver-users] the lines one above other
Hello All! The task is to show multilevel junction of highway. The lines should be at the same layer and has the same style, for example see orange lines on attached pic: [img]http://s14.postimg.org/yk40e0nq9/crossroad.jpg[/img] Is it possible to draw the lines one above other by an one layer? May be some method of Z-index for features in a layer exists? Thanks for any guidance to display this kind of crossroads. Vladimir___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
Re: [mapserver-users] the lines one above other
Vladimir, I see, so you do not need the order of the LAYERS but the order of the FEATURES. I did not understand that correctly at first, sorry. In that case, I guess Andreas approach would be the one. Best Lars Am 12.02.2015 um 14:26 schrieb Vladimir: Lars. Thank you very much for response. Please see the pics. What I have: http://s14.postimg.org/yk40e0nq9/crossroad.jpg What I need: http://s14.postimg.org/yk40e0nq9/crossroad.jpg The problem is the orange roads lies in a one layer because they are identical features(has the same type). It is done accordingly to specificity the app. And I would like to escape a duplication of layers if it is possible. Therefore i need to locate the features one above other at a one layer. ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
Re: [mapserver-users] the lines one above other
I'm not sure about this but AFAIK MapServer draws features in the order they are returned by the query. For Shapefiles there is the sortshp utility. If you're on a relational database like PostGIS or OracleSpatial you can try including the ORDER BY prio within the DATA. But since MS wraps it into a subquery the database might still return the features out of order. -Ursprüngliche Nachricht- Von: mapserver-users-boun...@lists.osgeo.org [mailto:mapserver-users- boun...@lists.osgeo.org] Im Auftrag von Vladimir Gesendet: Donnerstag, 12. Februar 2015 12:02 An: mapserver-users@lists.osgeo.org Betreff: [mapserver-users] the lines one above other Hello All! The task is to show multilevel junction of highway. The lines should be at the same layer and has the same style, for example see orange lines on attached pic: [img]http://s14.postimg.org/yk40e0nq9/crossroad.jpg[/img] Is it possible to draw the lines one above other by an one layer? May be some method of Z-index for features in a layer exists? Thanks for any guidance to display this kind of crossroads. Vladimir ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
Re: [mapserver-users] the lines one above other
For me it works by sorting in the map file. I then put the needed layers into my WMS request. The order does not matter in the request it seems. Best Lars Am 12.02.2015 um 13:52 schrieb Eichner, Andreas - SID: I'm not sure about this but AFAIK MapServer draws features in the order they are returned by the query. For Shapefiles there is the sortshp utility. If you're on a relational database like PostGIS or OracleSpatial you can try including the ORDER BY prio within the DATA. But since MS wraps it into a subquery the database might still return the features out of order. -Ursprüngliche Nachricht- Von: mapserver-users-boun...@lists.osgeo.org [mailto:mapserver-users- boun...@lists.osgeo.org] Im Auftrag von Vladimir Gesendet: Donnerstag, 12. Februar 2015 12:02 An: mapserver-users@lists.osgeo.org Betreff: [mapserver-users] the lines one above other Hello All! The task is to show multilevel junction of highway. The lines should be at the same layer and has the same style, for example see orange lines on attached pic: [img]http://s14.postimg.org/yk40e0nq9/crossroad.jpg[/img] Is it possible to draw the lines one above other by an one layer? May be some method of Z-index for features in a layer exists? Thanks for any guidance to display this kind of crossroads. Vladimir ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
Re: [mapserver-users] the lines one above other
Andreas. Thanks for response too. I use phpmapscript and postgis. How can I use order by for this purpose? Sorry. I have some correction: What I have: http://s18.postimg.org/vkvb8jprd/crossroad1.jpg What I need: http://s14.postimg.org/yk40e0nq9/crossroad.jpg ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
Re: [mapserver-users] the lines one above other
Hello Vladimir, I'm not sure if I understand right. However what I would do is the following: 1) Put all sources into different layers. That is: If you have different street layers in different sources, you can make one layer each in the mapfile or you can first make one source per street type (if possible). You can also group layers as union layers: http://mapserver.org/mapfile/union.html if you need to (like one street type coming from different sources) 2) In the mapfile, you can define the order how the layers are drawn one after the other (last layer in the mapfile is drawn first): http://mapserver.org/tutorial/example1-5.html I hope this helps. Best Lars Am 12.02.2015 um 12:01 schrieb Vladimir: Hello All! The task is to show multilevel junction of highway. The lines should be at the same layer and has the same style, for example see orange lines on attached pic: [img]http://s14.postimg.org/yk40e0nq9/crossroad.jpg[/img] Is it possible to draw the lines one above other by an one layer? May be some method of Z-index for features in a layer exists? Thanks for any guidance to display this kind of crossroads. Vladimir ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
Re: [mapserver-users] the lines one above other
Lars. Thank you very much for response. Please see the pics. What I have: http://s14.postimg.org/yk40e0nq9/crossroad.jpg What I need: http://s14.postimg.org/yk40e0nq9/crossroad.jpg The problem is the orange roads lies in a one layer because they are identical features(has the same type). It is done accordingly to specificity the app. And I would like to escape a duplication of layers if it is possible. Therefore i need to locate the features one above other at a one layer. ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
