Layer definition of JRC is unclear

[matthiasschaub]

  filter: |
    power=plant
  ratio_filter: |
    power=plant and power=* and name=*

-> doesn't power=plant invalidate power=*? So the difference between the filters is that the second one only returns named powerplants. The description gives no indication of whether this is the intended behavior.

[joker234]

Yes you're right. See this exemplary query:

% curl -X POST https://api.ohsome.org/v1/elements/count/ratio -d "bboxes=-180,-90,180,90" -d "filter=power=plant" -d "filter2=power=plant and power=* and name=*"
{
  "attribution" : {
    "url" : "https://ohsome.org/copyrights",
    "text" : "© OpenStreetMap contributors"
  },
  "apiVersion" : "1.5.0",
  "ratioResult" : [ {
    "timestamp" : "2021-06-28T09:00:00Z",
    "value" : 39314.0,
    "value2" : 23156.0,
    "ratio" : 0.589001
  } ]
}

% curl -X POST https://api.ohsome.org/v1/elements/count/ratio -d "bboxes=-180,-90,180,90" -d "filter=power=plant" -d "filter2=power=plant and name=*" 
{
  "attribution" : {
    "url" : "https://ohsome.org/copyrights",
    "text" : "© OpenStreetMap contributors"
  },
  "apiVersion" : "1.5.0",
  "ratioResult" : [ {
    "timestamp" : "2021-06-28T09:00:00Z",
    "value" : 39314.0,
    "value2" : 23156.0,
    "ratio" : 0.589001
  } ]
}

I would assume that JRC wants the ratio of power plants with a name, so power=plant and name=* should be sufficient.