Hi everyone,
I'm trying to perform a quite simple analysis in Postgis, but I'm facing
a TopologyException where there's no features.
You can find the data I'm using in this link
<https://mega.co.nz/#%21pFgnCBoA%21zx-Tb78nPGzL7Fcbw7dMheSbIrMfRJjJ9yV1Qv7Wx6o>.
What I try to do is the next:
* First I want to create a buffer for emt_paradas, and the layer
valenbisi, and then intersect them, the result I will call
"intersect_1".
| select st_intersection(buf_emt.st_union,buf_valenbisi.st_union)
from
(SELECT ST_union(st_buffer(emt_paradas.geom, 200)) FROM emt_paradas )as
buf_emt,
(SELECT ST_union(st_buffer(valenbisi.geom, 200)) FROM valenbisi )as
buf_valenbisi|
* Second, I want to create a buffer for carril_bici, and intersect
with "intersect_1". The result I will call "intersect_2".
| select
st_intersection(buf_carril_bici.st_union,inter_emt_valenbisi.st_intersection)
from
(select st_intersection(buf_emt.st_union,buf_valenbisi.st_union)
from
(SELECT ST_union(st_buffer(emt_paradas.geom, 200)) FROM emt_paradas )as
buf_emt,
(SELECT ST_union(st_buffer(valenbisi.geom, 200)) FROM valenbisi )as
buf_valenbisi) as intersect_1|
* Third, I want to create a buffer for layer ocio and make a
difference with "intersect_2". The result I will call: "diff_1".
| select st_difference(intersec_2.st_intersection, buf_ocio.st_union)
from
(select
st_intersection(buf_carril_bici.st_union,inter_emt_valenbisi.st_intersection)
from
(select st_intersection(buf_emt.st_union,buf_valenbisi.st_union)
from
(SELECT ST_union(st_buffer(emt_paradas.geom, 200)) FROM emt_paradas )as
buf_emt,
(SELECT ST_union(st_buffer(valenbisi.geom, 200)) FROM valenbisi )as
buf_valenbisi) as inter_emt_valenbisi,
(SELECT ST_union(st_buffer(carril_bici.geom, 200)) FROM carril_bici )as
buf_carril_bici) as intersectionEMT_valenbisi_carrilBici,
(SELECT ST_union(st_buffer(ocio.geom, 250)) FROM ocio )as buf_ocio|
* Finnaly I want to intersect "diff_1" with layer mapa_ruido_dia,
ideally where the field gridcode equals one or two.
| select 1 as id, st_intersection(diff_1.st_difference, mapa_ruido_dia.geom)
from
(select
st_difference(intersectionEMT_valenbisi_carrilBici.st_intersection,
buf_ocio.st_union)
from
(select
st_intersection(buf_carril_bici.st_union,inter_emt_valenbisi.st_intersection)
from
(select st_intersection(buf_emt.st_union,buf_valenbisi.st_union)
from
(SELECT ST_union(st_buffer(emt_paradas.geom, 200)) FROM emt_paradas )as
buf_emt,
(SELECT ST_union(st_buffer(valenbisi.geom, 200)) FROM valenbisi )as
buf_valenbisi) as inter_emt_valenbisi,
(SELECT ST_union(st_buffer(carril_bici.geom, 200)) FROM carril_bici )as
buf_carril_bici) as intersectionEMT_valenbisi_carrilBici,
(SELECT ST_union(st_buffer(ocio.geom, 250)) FROM ocio )as buf_ocio)as
diff_1, mapa_ruido_dia
where mapa_ruido_dia.gridcode='1' or mapa_ruido_dia.gridcode='2'
|
Is in this last one query when Postgis show me the TopologyException
|> Error performing intersection: TopologyException: Input geom 1 is
invalid: Self-intersection at or near point 723120.23091093975
4379700.195452339 at 723120.23091093975 4379700.195452339
Any ideas? Thank you very much!|
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