Is there a difference between indexing envelopes or polygons


(Nicolas THOMASSON) #1

Hello,

I'm new to ES. Please forgive me if I'm asking something stupid.

Is there a fundamental difference between indexing an envelope or indexing
a polygon ?

For example if I define the area as a envelope

{
"frame":{
"type":"envelope",
"coordinates": [[3,4],[1,2]]
}
}

or as a polygon

{
"frame":{
"type":"polygon",
"coordinates": [[[3,4],[3,2],[1,2],[1,4],[3,4]]]
}
}

As in my comprehension they both define the same area, should I be able to
perform the same queries whatever the way I defined the area ? (Currently I
have a search query that returns wrong results on the envelope and seems to
perform well on the polygon.)

Thanks for your help,

Nicolas

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(Alexander Reelsen) #2

Hey,

if there is an error, can you please open a github issue? However the
envelope shape expects you to set an upper left and lower right boundary.
Your coordinates more look like lower left and upper right (meaning you
might create quite a huge envelope acutally) - which obviously does not
matter for a polygon

--Alex

On Sat, Feb 22, 2014 at 11:14 AM, Nicolas THOMASSON <
nico.thomasson@gmail.com> wrote:

Hello,

I'm new to ES. Please forgive me if I'm asking something stupid.

Is there a fundamental difference between indexing an envelope or indexing
a polygon ?

For example if I define the area as a envelope

{
"frame":{
"type":"envelope",
"coordinates": [[3,4],[1,2]]
}
}

or as a polygon

{
"frame":{
"type":"polygon",
"coordinates": [[[3,4],[3,2],[1,2],[1,4],[3,4]]]
}
}

As in my comprehension they both define the same area, should I be able to
perform the same queries whatever the way I defined the area ? (Currently I
have a search query that returns wrong results on the envelope and seems to
perform well on the polygon.)

Thanks for your help,

Nicolas

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(Nicolas THOMASSON) #3

Hey thanks a lot !

Now it works just fine. I didn't see that coming, I thought ES was
complaining if envelope's coordinates was reverted. My bad...

Nicolas

Le lundi 24 février 2014 15:58:24 UTC+1, Alexander Reelsen a écrit :

Hey,

if there is an error, can you please open a github issue? However the
envelope shape expects you to set an upper left and lower right boundary.
Your coordinates more look like lower left and upper right (meaning you
might create quite a huge envelope acutally) - which obviously does not
matter for a polygon

--Alex

On Sat, Feb 22, 2014 at 11:14 AM, Nicolas THOMASSON <nico.th...@gmail.com<javascript:>

wrote:

Hello,

I'm new to ES. Please forgive me if I'm asking something stupid.

Is there a fundamental difference between indexing an envelope or
indexing a polygon ?

For example if I define the area as a envelope

{
"frame":{
"type":"envelope",
"coordinates": [[3,4],[1,2]]
}
}

or as a polygon

{
"frame":{
"type":"polygon",
"coordinates": [[[3,4],[3,2],[1,2],[1,4],[3,4]]]
}
}

As in my comprehension they both define the same area, should I be able
to perform the same queries whatever the way I defined the area ?
(Currently I have a search query that returns wrong results on the envelope
and seems to perform well on the polygon.)

Thanks for your help,

Nicolas

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(Alexander Reelsen) #4

Hey,

the problem here is that elasticsearch cant tell by itself if the envelope
borders need to be reverted or not... maybe you want/need such an envelope
in your calculations. Hard to tell from a machine perspective :slight_smile:

--Alex

On Tue, Feb 25, 2014 at 10:38 AM, Nicolas THOMASSON <
nico.thomasson@gmail.com> wrote:

Hey thanks a lot !

Now it works just fine. I didn't see that coming, I thought ES was
complaining if envelope's coordinates was reverted. My bad...

Nicolas

Le lundi 24 février 2014 15:58:24 UTC+1, Alexander Reelsen a écrit :

Hey,

if there is an error, can you please open a github issue? However the
envelope shape expects you to set an upper left and lower right boundary.
Your coordinates more look like lower left and upper right (meaning you
might create quite a huge envelope acutally) - which obviously does not
matter for a polygon

--Alex

On Sat, Feb 22, 2014 at 11:14 AM, Nicolas THOMASSON <nico.th...@gmail.com

wrote:

Hello,

I'm new to ES. Please forgive me if I'm asking something stupid.

Is there a fundamental difference between indexing an envelope or
indexing a polygon ?

For example if I define the area as a envelope

{
"frame":{
"type":"envelope",
"coordinates": [[3,4],[1,2]]
}
}

or as a polygon

{
"frame":{
"type":"polygon",
"coordinates": [[[3,4],[3,2],[1,2],[1,4],[3,4]]]
}
}

As in my comprehension they both define the same area, should I be able
to perform the same queries whatever the way I defined the area ?
(Currently I have a search query that returns wrong results on the envelope
and seems to perform well on the polygon.)

Thanks for your help,

Nicolas

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msgid/elasticsearch/a2fa0fd8-f9a9-435b-9d34-e603c7242d2f%
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(system) #5