Re: [postgis-users] Topology Attributes
Hi Nicolas, Thanks for the detailed description that make the unclear clear... Now I feel ready to implement ... Your support is a great example for the strength of the open source community ... BR. Ofer On Tue, Feb 10, 2015 at 11:07 AM, Nicolas Ribot nicolas.ri...@gmail.com wrote: Hi Ofer, Some precisions regarding the query I sent: A topoGeometry objects stores the following information ( http://postgis.net/docs/manual-2.1/topogeometry.html): • topopology_id: id of the topology, as stored in the Topology metadata • layer_id : the id of the layer in the topology • id: the id of the topogeometry object • type: the geometry type (point, line...) When joining between the Polygon table containing the TopoGeometryObject, I used a notation seen on this list to compare 2 values: (a, b) = (c, d), equivalent to a = b and c = d. The 1 in the first part (pe.parcelle p1 on (1, (p1.topo).id)) is the hard-coded (not very smart: I copied a test query I used) identifier of the Topology layer in the topology.layer metadata table. I obtained this value by running: select layer_id from topology.layer where schema_name = 'pe' and table_name = 'parcelle; So, in your case, check the layer_id of the department table and use this value. Nicolas On 9 February 2015 at 21:18, Ofer Zilberstein zilberstein.o...@gmail.com wrote: Hi, 1. I advanced ...and I used the topology.toTopoGeom() and now the relation is populated. 2. I try to understand the following join *pe.parcelle** p1 on (1, (p1.topo).id) *= (r1.layer_id, r1.topogeo_id) the second part of the join is clear -- comes from the relation table however the first part - is not so clear according to you - parcelle is the polygon table with a topo column containing the TopoGeometry object corresponding to the polygon (you have used here pe.parcelle - is it the table name ? ) so if in my case I have table 'department' with column 'topogeom' it would look like department d1 on (1,(d1.topogeom).id) = (r1.layer_id, r1.topogeo_id) ? Ofer On Mon, Feb 9, 2015 at 3:52 PM, Ofer Zilberstein zilberstein.o...@gmail.com wrote: Hi Nicolas, 1. I used ST_CreateTopoGeo() to build the topology (not the topology.toTopoGeom() as you mentioned ) When I look at the relation table its empty ? should I use topology.toTopoGeom() instead, and it will populate it ? 2. can you explain what the parentheses (special the 1, ...) part mean... join pe.parcelle p1 on *(1, (p1.topo).id)* = (r1.layer_id, r1.topogeo_id) Thanks in advanced ... Ofer On Mon, Feb 9, 2015 at 11:05 AM, Nicolas Ribot nicolas.ri...@gmail.com wrote: Hi, As usual with SQL, there must be several other ways to perform the same query. As the edge view stores 2 faces id per row (left and right), I duplicated the joins to join both left_face and right face against the original polygon table (p1 and p2 aliases) Nicolas On 8 February 2015 at 21:57, Ofer Zilberstein zilberstein.o...@gmail.com wrote: Much Thanks, First I will try to understand the join that you did and then try to implement it... Ofer On Sun, Feb 8, 2015 at 12:44 PM, Nicolas Ribot nicolas.ri...@gmail.com wrote: Hi, When you build the topology, for instance with topology.toTopoGeom(), you get back a TopoGeometry object for each polygon added to the topology. This TopoGeometry is used to keep a link between your polygon object and all the topological elements composing it. The relation table inside the topo schema holding the topology contains the identifier of the topoGeometry object and the identifiers of topo elements composing the polygon. To get the right and left original polygons from the topology, you make a join between edge, relation and pg table: (topo_grass is the topo schema, parcelle is the polygon table with a topo column containing the TopoGeometry object corresponding to the polygon): select e.edge_id, e.left_face, e.right_face, p1.id as left_id, p2.id as right_id from topo_grass.edge e join topo_grass.relation r1 on r1.element_id = e.left_face join pe.parcelle p1 on (1, (p1.topo).id) = (r1.layer_id, r1.topogeo_id) join topo_grass.relation r2 on r2.element_id = e.right_face join pe.parcelle p2 on (1, (p2.topo).id) = (r2.layer_id, r2.topogeo_id); Nicolas On 8 February 2015 at 10:29, Ofer Zilberstein zilberstein.o...@gmail.com wrote: Hi, When you build topology from set of connected polygons, the original polygon attributes are not part of the topology model. The model creates MBR face for each original polygon. The edges hold the left right faces. How or what is the right way to add to the edges the right and left original polygons ? -- *Ofer Zilberstein* Mobile: 972-544886873 Skype: ofer.zilberstein Mail: zilberstein.o...@gmail.com ___ postgis-users mailing list postgis-users@lists.osgeo.org
Re: [postgis-users] Topology Attributes
Hi Ofer, Some precisions regarding the query I sent: A topoGeometry objects stores the following information ( http://postgis.net/docs/manual-2.1/topogeometry.html): • topopology_id: id of the topology, as stored in the Topology metadata • layer_id : the id of the layer in the topology • id: the id of the topogeometry object • type: the geometry type (point, line...) When joining between the Polygon table containing the TopoGeometryObject, I used a notation seen on this list to compare 2 values: (a, b) = (c, d), equivalent to a = b and c = d. The 1 in the first part (pe.parcelle p1 on (1, (p1.topo).id)) is the hard-coded (not very smart: I copied a test query I used) identifier of the Topology layer in the topology.layer metadata table. I obtained this value by running: select layer_id from topology.layer where schema_name = 'pe' and table_name = 'parcelle; So, in your case, check the layer_id of the department table and use this value. Nicolas On 9 February 2015 at 21:18, Ofer Zilberstein zilberstein.o...@gmail.com wrote: Hi, 1. I advanced ...and I used the topology.toTopoGeom() and now the relation is populated. 2. I try to understand the following join *pe.parcelle** p1 on (1, (p1.topo).id) *= (r1.layer_id, r1.topogeo_id) the second part of the join is clear -- comes from the relation table however the first part - is not so clear according to you - parcelle is the polygon table with a topo column containing the TopoGeometry object corresponding to the polygon (you have used here pe.parcelle - is it the table name ? ) so if in my case I have table 'department' with column 'topogeom' it would look like department d1 on (1,(d1.topogeom).id) = (r1.layer_id, r1.topogeo_id) ? Ofer On Mon, Feb 9, 2015 at 3:52 PM, Ofer Zilberstein zilberstein.o...@gmail.com wrote: Hi Nicolas, 1. I used ST_CreateTopoGeo() to build the topology (not the topology.toTopoGeom() as you mentioned ) When I look at the relation table its empty ? should I use topology.toTopoGeom() instead, and it will populate it ? 2. can you explain what the parentheses (special the 1, ...) part mean... join pe.parcelle p1 on *(1, (p1.topo).id)* = (r1.layer_id, r1.topogeo_id) Thanks in advanced ... Ofer On Mon, Feb 9, 2015 at 11:05 AM, Nicolas Ribot nicolas.ri...@gmail.com wrote: Hi, As usual with SQL, there must be several other ways to perform the same query. As the edge view stores 2 faces id per row (left and right), I duplicated the joins to join both left_face and right face against the original polygon table (p1 and p2 aliases) Nicolas On 8 February 2015 at 21:57, Ofer Zilberstein zilberstein.o...@gmail.com wrote: Much Thanks, First I will try to understand the join that you did and then try to implement it... Ofer On Sun, Feb 8, 2015 at 12:44 PM, Nicolas Ribot nicolas.ri...@gmail.com wrote: Hi, When you build the topology, for instance with topology.toTopoGeom(), you get back a TopoGeometry object for each polygon added to the topology. This TopoGeometry is used to keep a link between your polygon object and all the topological elements composing it. The relation table inside the topo schema holding the topology contains the identifier of the topoGeometry object and the identifiers of topo elements composing the polygon. To get the right and left original polygons from the topology, you make a join between edge, relation and pg table: (topo_grass is the topo schema, parcelle is the polygon table with a topo column containing the TopoGeometry object corresponding to the polygon): select e.edge_id, e.left_face, e.right_face, p1.id as left_id, p2.id as right_id from topo_grass.edge e join topo_grass.relation r1 on r1.element_id = e.left_face join pe.parcelle p1 on (1, (p1.topo).id) = (r1.layer_id, r1.topogeo_id) join topo_grass.relation r2 on r2.element_id = e.right_face join pe.parcelle p2 on (1, (p2.topo).id) = (r2.layer_id, r2.topogeo_id); Nicolas On 8 February 2015 at 10:29, Ofer Zilberstein zilberstein.o...@gmail.com wrote: Hi, When you build topology from set of connected polygons, the original polygon attributes are not part of the topology model. The model creates MBR face for each original polygon. The edges hold the left right faces. How or what is the right way to add to the edges the right and left original polygons ? -- *Ofer Zilberstein* Mobile: 972-544886873 Skype: ofer.zilberstein Mail: zilberstein.o...@gmail.com ___ postgis-users mailing list postgis-users@lists.osgeo.org http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users ___ postgis-users mailing list postgis-users@lists.osgeo.org http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users -- *Ofer Zilberstein* Mobile: 972-544886873 Skype: ofer.zilberstein Mail:
Re: [postgis-users] Topology Attributes
Hi, As usual with SQL, there must be several other ways to perform the same query. As the edge view stores 2 faces id per row (left and right), I duplicated the joins to join both left_face and right face against the original polygon table (p1 and p2 aliases) Nicolas On 8 February 2015 at 21:57, Ofer Zilberstein zilberstein.o...@gmail.com wrote: Much Thanks, First I will try to understand the join that you did and then try to implement it... Ofer On Sun, Feb 8, 2015 at 12:44 PM, Nicolas Ribot nicolas.ri...@gmail.com wrote: Hi, When you build the topology, for instance with topology.toTopoGeom(), you get back a TopoGeometry object for each polygon added to the topology. This TopoGeometry is used to keep a link between your polygon object and all the topological elements composing it. The relation table inside the topo schema holding the topology contains the identifier of the topoGeometry object and the identifiers of topo elements composing the polygon. To get the right and left original polygons from the topology, you make a join between edge, relation and pg table: (topo_grass is the topo schema, parcelle is the polygon table with a topo column containing the TopoGeometry object corresponding to the polygon): select e.edge_id, e.left_face, e.right_face, p1.id as left_id, p2.id as right_id from topo_grass.edge e join topo_grass.relation r1 on r1.element_id = e.left_face join pe.parcelle p1 on (1, (p1.topo).id) = (r1.layer_id, r1.topogeo_id) join topo_grass.relation r2 on r2.element_id = e.right_face join pe.parcelle p2 on (1, (p2.topo).id) = (r2.layer_id, r2.topogeo_id); Nicolas On 8 February 2015 at 10:29, Ofer Zilberstein zilberstein.o...@gmail.com wrote: Hi, When you build topology from set of connected polygons, the original polygon attributes are not part of the topology model. The model creates MBR face for each original polygon. The edges hold the left right faces. How or what is the right way to add to the edges the right and left original polygons ? -- *Ofer Zilberstein* Mobile: 972-544886873 Skype: ofer.zilberstein Mail: zilberstein.o...@gmail.com ___ postgis-users mailing list postgis-users@lists.osgeo.org http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users ___ postgis-users mailing list postgis-users@lists.osgeo.org http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users -- *Ofer Zilberstein* Mobile: 972-544886873 Skype: ofer.zilberstein Mail: zilberstein.o...@gmail.com ___ postgis-users mailing list postgis-users@lists.osgeo.org http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users ___ postgis-users mailing list postgis-users@lists.osgeo.org http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users
Re: [postgis-users] Topology Attributes
Hi, 1. I advanced ...and I used the topology.toTopoGeom() and now the relation is populated. 2. I try to understand the following join *pe.parcelle** p1 on (1, (p1.topo).id) *= (r1.layer_id, r1.topogeo_id) the second part of the join is clear -- comes from the relation table however the first part - is not so clear according to you - parcelle is the polygon table with a topo column containing the TopoGeometry object corresponding to the polygon (you have used here pe.parcelle - is it the table name ? ) so if in my case I have table 'department' with column 'topogeom' it would look like department d1 on (1,(d1.topogeom).id) = (r1.layer_id, r1.topogeo_id) ? Ofer On Mon, Feb 9, 2015 at 3:52 PM, Ofer Zilberstein zilberstein.o...@gmail.com wrote: Hi Nicolas, 1. I used ST_CreateTopoGeo() to build the topology (not the topology.toTopoGeom() as you mentioned ) When I look at the relation table its empty ? should I use topology.toTopoGeom() instead, and it will populate it ? 2. can you explain what the parentheses (special the 1, ...) part mean... join pe.parcelle p1 on *(1, (p1.topo).id)* = (r1.layer_id, r1.topogeo_id) Thanks in advanced ... Ofer On Mon, Feb 9, 2015 at 11:05 AM, Nicolas Ribot nicolas.ri...@gmail.com wrote: Hi, As usual with SQL, there must be several other ways to perform the same query. As the edge view stores 2 faces id per row (left and right), I duplicated the joins to join both left_face and right face against the original polygon table (p1 and p2 aliases) Nicolas On 8 February 2015 at 21:57, Ofer Zilberstein zilberstein.o...@gmail.com wrote: Much Thanks, First I will try to understand the join that you did and then try to implement it... Ofer On Sun, Feb 8, 2015 at 12:44 PM, Nicolas Ribot nicolas.ri...@gmail.com wrote: Hi, When you build the topology, for instance with topology.toTopoGeom(), you get back a TopoGeometry object for each polygon added to the topology. This TopoGeometry is used to keep a link between your polygon object and all the topological elements composing it. The relation table inside the topo schema holding the topology contains the identifier of the topoGeometry object and the identifiers of topo elements composing the polygon. To get the right and left original polygons from the topology, you make a join between edge, relation and pg table: (topo_grass is the topo schema, parcelle is the polygon table with a topo column containing the TopoGeometry object corresponding to the polygon): select e.edge_id, e.left_face, e.right_face, p1.id as left_id, p2.id as right_id from topo_grass.edge e join topo_grass.relation r1 on r1.element_id = e.left_face join pe.parcelle p1 on (1, (p1.topo).id) = (r1.layer_id, r1.topogeo_id) join topo_grass.relation r2 on r2.element_id = e.right_face join pe.parcelle p2 on (1, (p2.topo).id) = (r2.layer_id, r2.topogeo_id); Nicolas On 8 February 2015 at 10:29, Ofer Zilberstein zilberstein.o...@gmail.com wrote: Hi, When you build topology from set of connected polygons, the original polygon attributes are not part of the topology model. The model creates MBR face for each original polygon. The edges hold the left right faces. How or what is the right way to add to the edges the right and left original polygons ? -- *Ofer Zilberstein* Mobile: 972-544886873 Skype: ofer.zilberstein Mail: zilberstein.o...@gmail.com ___ postgis-users mailing list postgis-users@lists.osgeo.org http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users ___ postgis-users mailing list postgis-users@lists.osgeo.org http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users -- *Ofer Zilberstein* Mobile: 972-544886873 Skype: ofer.zilberstein Mail: zilberstein.o...@gmail.com ___ postgis-users mailing list postgis-users@lists.osgeo.org http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users ___ postgis-users mailing list postgis-users@lists.osgeo.org http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users -- *Ofer Zilberstein* Mobile: 972-544886873 Skype: ofer.zilberstein Mail: zilberstein.o...@gmail.com -- *Ofer Zilberstein* Mobile: 972-544886873 Skype: ofer.zilberstein Mail: zilberstein.o...@gmail.com ___ postgis-users mailing list postgis-users@lists.osgeo.org http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users
Re: [postgis-users] Topology Attributes
Hi Nicolas, 1. I used ST_CreateTopoGeo() to build the topology (not the topology.toTopoGeom() as you mentioned ) When I look at the relation table its empty ? should I use topology.toTopoGeom() instead, and it will populate it ? 2. can you explain what the parentheses (special the 1, ...) part mean... join pe.parcelle p1 on *(1, (p1.topo).id)* = (r1.layer_id, r1.topogeo_id) Thanks in advanced ... Ofer On Mon, Feb 9, 2015 at 11:05 AM, Nicolas Ribot nicolas.ri...@gmail.com wrote: Hi, As usual with SQL, there must be several other ways to perform the same query. As the edge view stores 2 faces id per row (left and right), I duplicated the joins to join both left_face and right face against the original polygon table (p1 and p2 aliases) Nicolas On 8 February 2015 at 21:57, Ofer Zilberstein zilberstein.o...@gmail.com wrote: Much Thanks, First I will try to understand the join that you did and then try to implement it... Ofer On Sun, Feb 8, 2015 at 12:44 PM, Nicolas Ribot nicolas.ri...@gmail.com wrote: Hi, When you build the topology, for instance with topology.toTopoGeom(), you get back a TopoGeometry object for each polygon added to the topology. This TopoGeometry is used to keep a link between your polygon object and all the topological elements composing it. The relation table inside the topo schema holding the topology contains the identifier of the topoGeometry object and the identifiers of topo elements composing the polygon. To get the right and left original polygons from the topology, you make a join between edge, relation and pg table: (topo_grass is the topo schema, parcelle is the polygon table with a topo column containing the TopoGeometry object corresponding to the polygon): select e.edge_id, e.left_face, e.right_face, p1.id as left_id, p2.id as right_id from topo_grass.edge e join topo_grass.relation r1 on r1.element_id = e.left_face join pe.parcelle p1 on (1, (p1.topo).id) = (r1.layer_id, r1.topogeo_id) join topo_grass.relation r2 on r2.element_id = e.right_face join pe.parcelle p2 on (1, (p2.topo).id) = (r2.layer_id, r2.topogeo_id); Nicolas On 8 February 2015 at 10:29, Ofer Zilberstein zilberstein.o...@gmail.com wrote: Hi, When you build topology from set of connected polygons, the original polygon attributes are not part of the topology model. The model creates MBR face for each original polygon. The edges hold the left right faces. How or what is the right way to add to the edges the right and left original polygons ? -- *Ofer Zilberstein* Mobile: 972-544886873 Skype: ofer.zilberstein Mail: zilberstein.o...@gmail.com ___ postgis-users mailing list postgis-users@lists.osgeo.org http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users ___ postgis-users mailing list postgis-users@lists.osgeo.org http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users -- *Ofer Zilberstein* Mobile: 972-544886873 Skype: ofer.zilberstein Mail: zilberstein.o...@gmail.com ___ postgis-users mailing list postgis-users@lists.osgeo.org http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users ___ postgis-users mailing list postgis-users@lists.osgeo.org http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users -- *Ofer Zilberstein* Mobile: 972-544886873 Skype: ofer.zilberstein Mail: zilberstein.o...@gmail.com ___ postgis-users mailing list postgis-users@lists.osgeo.org http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users
Re: [postgis-users] Topology Attributes
Hi, When you build the topology, for instance with topology.toTopoGeom(), you get back a TopoGeometry object for each polygon added to the topology. This TopoGeometry is used to keep a link between your polygon object and all the topological elements composing it. The relation table inside the topo schema holding the topology contains the identifier of the topoGeometry object and the identifiers of topo elements composing the polygon. To get the right and left original polygons from the topology, you make a join between edge, relation and pg table: (topo_grass is the topo schema, parcelle is the polygon table with a topo column containing the TopoGeometry object corresponding to the polygon): select e.edge_id, e.left_face, e.right_face, p1.id as left_id, p2.id as right_id from topo_grass.edge e join topo_grass.relation r1 on r1.element_id = e.left_face join pe.parcelle p1 on (1, (p1.topo).id) = (r1.layer_id, r1.topogeo_id) join topo_grass.relation r2 on r2.element_id = e.right_face join pe.parcelle p2 on (1, (p2.topo).id) = (r2.layer_id, r2.topogeo_id); Nicolas On 8 February 2015 at 10:29, Ofer Zilberstein zilberstein.o...@gmail.com wrote: Hi, When you build topology from set of connected polygons, the original polygon attributes are not part of the topology model. The model creates MBR face for each original polygon. The edges hold the left right faces. How or what is the right way to add to the edges the right and left original polygons ? -- *Ofer Zilberstein* Mobile: 972-544886873 Skype: ofer.zilberstein Mail: zilberstein.o...@gmail.com ___ postgis-users mailing list postgis-users@lists.osgeo.org http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users ___ postgis-users mailing list postgis-users@lists.osgeo.org http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users
Re: [postgis-users] Topology Attributes
Thanks, I'm trying to figure out the process Ofer On Sun, Feb 8, 2015 at 4:58 PM, Richard Greenwood richard.greenw...@gmail.com wrote: I don't know if this will help but here is a link to a PDF http://www.greenwoodmap.com/presentations/WyGEO-Lander-2014.pdf of a presentation I did a while ago. Starting on page 14 I am trying to illustrate how attributes from a simple polygon source can be joined to edges in PostGIS topology . Rich On Sun, Feb 8, 2015 at 2:29 AM, Ofer Zilberstein zilberstein.o...@gmail.com wrote: Hi, When you build topology from set of connected polygons, the original polygon attributes are not part of the topology model. The model creates MBR face for each original polygon. The edges hold the left right faces. How or what is the right way to add to the edges the right and left original polygons ? -- *Ofer Zilberstein* Mobile: 972-544886873 Skype: ofer.zilberstein Mail: zilberstein.o...@gmail.com ___ postgis-users mailing list postgis-users@lists.osgeo.org http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users -- Richard W. Greenwood, PLS www.greenwoodmap.com ___ postgis-users mailing list postgis-users@lists.osgeo.org http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users -- *Ofer Zilberstein* Mobile: 972-544886873 Skype: ofer.zilberstein Mail: zilberstein.o...@gmail.com ___ postgis-users mailing list postgis-users@lists.osgeo.org http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users
Re: [postgis-users] Topology Attributes
I don't know if this will help but here is a link to a PDF http://www.greenwoodmap.com/presentations/WyGEO-Lander-2014.pdf of a presentation I did a while ago. Starting on page 14 I am trying to illustrate how attributes from a simple polygon source can be joined to edges in PostGIS topology . Rich On Sun, Feb 8, 2015 at 2:29 AM, Ofer Zilberstein zilberstein.o...@gmail.com wrote: Hi, When you build topology from set of connected polygons, the original polygon attributes are not part of the topology model. The model creates MBR face for each original polygon. The edges hold the left right faces. How or what is the right way to add to the edges the right and left original polygons ? -- *Ofer Zilberstein* Mobile: 972-544886873 Skype: ofer.zilberstein Mail: zilberstein.o...@gmail.com ___ postgis-users mailing list postgis-users@lists.osgeo.org http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users -- Richard W. Greenwood, PLS www.greenwoodmap.com ___ postgis-users mailing list postgis-users@lists.osgeo.org http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users
Re: [postgis-users] Topology Attributes
Much Thanks, First I will try to understand the join that you did and then try to implement it... Ofer On Sun, Feb 8, 2015 at 12:44 PM, Nicolas Ribot nicolas.ri...@gmail.com wrote: Hi, When you build the topology, for instance with topology.toTopoGeom(), you get back a TopoGeometry object for each polygon added to the topology. This TopoGeometry is used to keep a link between your polygon object and all the topological elements composing it. The relation table inside the topo schema holding the topology contains the identifier of the topoGeometry object and the identifiers of topo elements composing the polygon. To get the right and left original polygons from the topology, you make a join between edge, relation and pg table: (topo_grass is the topo schema, parcelle is the polygon table with a topo column containing the TopoGeometry object corresponding to the polygon): select e.edge_id, e.left_face, e.right_face, p1.id as left_id, p2.id as right_id from topo_grass.edge e join topo_grass.relation r1 on r1.element_id = e.left_face join pe.parcelle p1 on (1, (p1.topo).id) = (r1.layer_id, r1.topogeo_id) join topo_grass.relation r2 on r2.element_id = e.right_face join pe.parcelle p2 on (1, (p2.topo).id) = (r2.layer_id, r2.topogeo_id); Nicolas On 8 February 2015 at 10:29, Ofer Zilberstein zilberstein.o...@gmail.com wrote: Hi, When you build topology from set of connected polygons, the original polygon attributes are not part of the topology model. The model creates MBR face for each original polygon. The edges hold the left right faces. How or what is the right way to add to the edges the right and left original polygons ? -- *Ofer Zilberstein* Mobile: 972-544886873 Skype: ofer.zilberstein Mail: zilberstein.o...@gmail.com ___ postgis-users mailing list postgis-users@lists.osgeo.org http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users ___ postgis-users mailing list postgis-users@lists.osgeo.org http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users -- *Ofer Zilberstein* Mobile: 972-544886873 Skype: ofer.zilberstein Mail: zilberstein.o...@gmail.com ___ postgis-users mailing list postgis-users@lists.osgeo.org http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users
