Grouping multiple categories in Overpass Turbo

Question

Hello guys,

I have UNION query

area["name"="London"]["admin_level"="6"];
node(area)["amenity"="cafe"]->.cafe;
node(area)["amenity"="bar"]->.bar;
(
.cafe;
.bar;
)->.all;
( .all; - ._; );
(._;);
out;

all is working good

BUT is there a way to grouping the received Nodes(or ways) like this?

<cafe>
  <node id="20849687" lat="51.4111705" lon="-0.3339165">
    <tag k="amenity" v="cafe"/>
    <tag k="note" v="is a trailer parked there, serving tea, sandwiches, ice-cream etc."/>
    <tag k="operator" v="ECSI Limited"/>
  </node>
  <node id="25475389" lat="51.5265807" lon="-0.1292505">
    <tag k="amenity" v="cafe"/>
    <tag k="fixme" v="not on FHRS"/>
    <tag k="name" v="Woburn Cafe"/>
  </node>
  ...etc (all cafes)
</cafe>
<bar>
  <node id="21593237" lat="51.5173465" lon="-0.1189566">
    <tag k="amenity" v="bar"/>
    <tag k="cuisine" v="polish"/>
    <tag k="food" v="yes"/>
    <tag k="name" v="Bar Polski"/>
    <tag k="toilets" v="yes"/>
    <tag k="toilets:access" v="customers"/>
  </node>
  ...etc (all bars)
</bar>

Answer 1

0

To group the results, get rid of the union and repeat the out statement (untested):

area["name"="London"]["admin_level"="6"]->.searchArea;
node(area.searchArea)["amenity"="cafe"];
out;
node(area.searchArea)["amenity"="bar"];
out;

They won't be grouped under cafe and bar elements in the output but they will be separated by type.

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answered 01 Feb '18, 21:20

maxerickson
12.7k●10●83●176
accept rate: 32%

edited 04 Feb '18, 00:31

Sorry, but don't works, only show the "Cafe" results. is there a way for example add some separator between categories? For example -------, or +++++ ?

(02 Feb '18, 06:01) davittorosyan

Sorry, the bar query didn't have any areas to search in. I've amended the query to save the search area to a set.

(04 Feb '18, 00:30) maxerickson

Answer 2

0

Sorry, but AFAIK, it is not possible as maxerickson already indicated. You try to introduce a tags that does not exist in the OSM model (bar & cafe).

You have to be aware that Overpass is just a very thin layer above the raw OSM data. Although it's powerful, you are still expected to write some code to format the result in the model you want.

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answered 02 Feb '18, 10:25

escada
19.0k●16●166●302
accept rate: 21%

amenity=cafe and amenity=bar are widely used tags, so I'm not sure what you mean here.

(02 Feb '18, 16:28) alester

@alester I mean can we somehow separate the results with some custom separators?

(02 Feb '18, 16:49) davittorosyan

They are widely used as value for v (see XML above), not as tag e. g. <pub>. The OP tries to create a whole new XML format. This is not possible server side and should be done locally

(02 Feb '18, 17:39) escada

Answer 3

0

Thank you guys for answers, but lets think from another angle of view

What if we will have one querie for pub and bars and between this 2 results insert additional line(for example "+++" this line)? Or this is also mran structure changing? My problem im 2 words - have 1 query but separate results in response.

Response I need, should be like this:

Pubs
+++
Bars
+++
Restaurants
+++
Fast foods
+++
Ets...

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answered 04 Feb '18, 15:04

davittorosyan
51●4●4●8
accept rate: 0%

edited 04 Feb '18, 15:10

1

You can use the make statement to insert elements between the out statements.

https://wiki.openstreetmap.org/wiki/Overpass_API/Overpass_QL#The_make_statement

(05 Feb '18, 00:31) maxerickson

@maxerickson wow...thanks a lot finally i can see something, which can help resolve my problem. Can you see my comment below please.

(05 Feb '18, 13:30) davittorosyan

Answer 4

0

Thanks @maxerickson for solution, if you can please help me here also: I Have this part of code, and this is works good, my custom tag inserted with separate OUT in end of whole XML:

area["name"="London"]["admin_level"="6"];
node(area)["amenity"="cafe"]->.cafe;
node(area)["amenity"="bar"]->.bar;


(

.cafe;
.bar;

)->.all;


( .all; - ._; );

(._;);


out;

make my_element_name                           
     ::id = 1234,                            
     "tag1" = "this is the value of tag1",    
     "tag2" = 4711,                          
     "tag3" = date("2018-07-01");             
out;

is there solution to insert many custom tags after each category, for eaxmple?:

Cafes
<my_element_name1>
Bars
<my_element_name2>
etc...

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answered 05 Feb '18, 14:06

davittorosyan
51●4●4●8
accept rate: 0%

edited 05 Feb '18, 14:07

1

Simply place multiple make statements in the script.

(06 Feb '18, 00:36) maxerickson

sorry if my question will sounds simple...but i'm not expert on overpass queries.. but in my concept of query i wrote above in this comment, how can i place multiple "make"? this is union query and I cant imagine how i can insert between categories my "make"-s. can you please wrote example?

(06 Feb '18, 06:18) davittorosyan

UPDATE. @maxerickson I have some progress, please see comment below.

(06 Feb '18, 07:11) davittorosyan

Answer 5

0

I have some progress... current query

area["name"="London"]["admin_level"="6"];
node(area)["amenity"="cafe"]->.cafe;
node(area)["amenity"="bar"]->.bar;

make node                           
     ::id = 1,                            
     "tag1" = "aaa",    
     "tag2" = 4711,                          
     "tag3" = date("2018-07-01")->.my_custom_node1;

make node                           
     ::id = 2,                            
     "tag1" = "bbb",    
     "tag2" = 4711,                          
     "tag3" = date("2018-07-01")->.my_custom_node2;

(

  .cafe;
  .my_custom_node1;
  .bar;
  .my_custom_node2;

)->.all;


( .all; - ._; );

(._;);


out;

ONLY one problem i have now - ORDERING. I Know, Overpass by default return ordered by id, but is there a way, get response with this ordering ?

<cafe>(all cafes)
<my_custom_node1>
<bar>(all bars)
<my_custom_node2>

because currently this 2 custom tags added in very bottom of the whole result.

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answered 06 Feb '18, 07:16

davittorosyan
51●4●4●8
accept rate: 0%

edited 06 Feb '18, 07:16

1

You need to use multiple out statements, like in my earlier answer.

Note that ( .all; - ._; ); and (._;); aren't doing much in your script. The statement ending in ->.all leaves the default set (._) empty and those statements say "Subtract an empty set from my results and store it in ._" and "take the current default set and store it in the default set". Eliminating those two statements and using .all out; is a more direct way of doing the same thing.

Anyway, to get results all together with ordering determined by the server, use a union. To get results in an order that you determine, use multiple out statements.

(06 Feb '18, 12:51) maxerickson

@maxerickson you are one of the best Overpass QL masters. Thanks a lot for finding solution for this problem. Works fine for me, Thanks again

(06 Feb '18, 14:47) davittorosyan

Grouping multiple categories in Overpass Turbo

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