Hi,
Yes. With different projections there is one issue: Elasticsearch only converts
the polygon points to wgs84. But depending on the projection, the lines between
the points may have a different shape in reality (no longer lines, but maybe
curves), but as only the line endpoints are converted they get straight, which
may cause a shape of the polygon, where in wgs84 projection some lines may
overlap other lines.
The projection converters are nice in Elasticsearch, but far from useable for
real use cases. Because the earth is not rectangular and flat. 🤣
Uwe
Am June 4, 2020 1:24:28 PM UTC schrieb Claeys Wouter
<wouter.cla...@vlaanderen.be>:
>Thanks for the help! This isn't very clear in the Elasticsearch docs.
>Upon converting to WGS-84 everything seems to index fine.
>
>________________________________
>Van: Ignacio Vera <iv...@apache.org>
>Verzonden: donderdag 4 juni 2020 14:01
>Aan: java-user@lucene.apache.org <java-user@lucene.apache.org>
>Onderwerp: Re: Tessellate exception in Elasticsearch
>
>I think this is not a lucene issue. Elasticsearch geo_shape only
>supports
>(and it assumes) polygons on the WGS-84 reference system.
>
>On Thu, Jun 4, 2020 at 1:38 PM Claeys Wouter
><wouter.cla...@vlaanderen.be>
>wrote:
>
>> Hi,
>>
>> This is the original polygon:
>>
>> {
>> "crs":{
>> "type":"name",
>> "properties":{
>> "name":"urn:ogc:def:crs:EPSG::31370"
>> }
>> },
>> "type":"MultiPolygon",
>> "coordinates":[
>> [
>> [
>> [
>> 171044.231002,
>> 175818.094268
>> ],
>> [
>> 170996.799514,
>> 175850.678652
>> ],
>> [
>> 170957.441562,
>> 175877.716668
>> ],
>> [
>> 170946.243418,
>> 175861.052668
>> ],
>> [
>> 170935.531674,
>> 175845.112572
>> ],
>> [
>> 170923.57865,
>> 175827.325308
>> ],
>> [
>> 170906.675354,
>> 175802.171388
>> ],
>> [
>> 170886.642266,
>> 175772.360124
>> ],
>> [
>> 170886.478554,
>> 175772.116476
>> ],
>> [
>> 170951.311002,
>> 175727.607548
>> ],
>> [
>> 171026.378266,
>> 175676.072188
>> ],
>> [
>> 171098.875162,
>> 175780.555004
>> ],
>> [
>> 171090.729754,
>> 175786.150716
>> ],
>> [
>> 171044.231002,
>> 175818.094268
>> ]
>> ]
>> ]
>> ]
>> }
>>
>> Thanks!
>>
>> ________________________________
>> Van: Ignacio Vera Sequeiros <iv...@apache.org>
>> Verzonden: donderdag 4 juni 2020 12:24
>> Aan: java-user@lucene.apache.org <java-user@lucene.apache.org>
>> Onderwerp: Re: Tessellate exception in Elasticsearch
>>
>> Hi,
>>
>> I think your polygon has intersecting edges but it is difficult to
>> reproduce with that output. Could you provide the original polygon
>you are
>> trying to index?
>>
>> Thanks!
>>
>> On Thu, Jun 4, 2020 at 11:30 AM Claeys Wouter
><wouter.cla...@vlaanderen.be
>> >
>> wrote:
>>
>> > Hi,
>> >
>> > This is an error which we get in Elasticsearch when trying to index
>> > geo_shape fields but it seems this can be narrowed down to a
>problem in
>> > Lucene. We can reproduce the problem withe ES 6.8.x and ES 7.7.x.
>This is
>> > the error we are getting:
>> >
>> > Caused by: java.lang.IllegalArgumentException: Unable to Tessellate
>shape
>> > [[9.32134799999767, -3.200485999986995] [-17.716668000008212,
>> > -42.5584380000073] [-1.0526679999893531, -53.7565820000018]
>> > [14.887427999987267, -64.46832600000198] [32.674692000000505,
>> > -76.42134999998962] [57.82861200001207, -93.32464599999366]
>> > [87.6398760000011, -113.35773399999016] [87.8835240000044,
>> > -113.52144599999883] [47.60754799999995, -48.68899799999781]
>> > [-3.9278120000089984, 26.378266000014264] [79.44499600000563,
>> > 98.87516200001119] [73.84928399999626, 90.72975399999996]
>> > [41.90573200001381, 44.23100199998589] [9.32134799999767,
>> > -3.200485999986995] ]. Possible malformed shape detected.
>> > at
>> > org.apache.lucene.geo.Tessellator.tessellate(Tessellator.java:114)
>> > ~[lucene-sandbox-7.7.3.jar:7.7.3
>> 1a0d2a901dfec93676b0fe8be425101ceb754b85 -
>> > noble - 2020-04-21 10:31:55]
>> > at
>> >
>>
>org.apache.lucene.document.LatLonShape.createIndexableFields(LatLonShape.java:73)
>> > ~[lucene-sandbox-7.7.3.jar:7.7.3
>> 1a0d2a901dfec93676b0fe8be425101ceb754b85 -
>> > noble - 2020-04-21 10:31:55]
>> > at
>> >
>>
>org.elasticsearch.index.mapper.GeoShapeFieldMapper.indexShape(GeoShapeFieldMapper.java:146)
>> > ~[elasticsearch-6.8.9.jar:6.8.9]
>> >
>> > This is a very basic geometry. Could someone please explain why
>this
>> shape
>> > is invalid?
>> >
>> >
>> >
>> >
>> > Thanks in advance,
>> >
>> > Wouter Claeys
>> >
>>
--
Uwe Schindler
Achterdiek 19, 28357 Bremen
https://www.thetaphi.de
