Play with this in the template editor, and with reference to tools like JSON Viewer Online Best and Free
What a horribly convoluted data structure that is!
First line is the JSON response minified to a single line.
Second line pulls out the first elevation item.
Third and fourth lines get the data you want from that.
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{% set i = value_json['value']['timeSeries']|selectattr('variable.variableDescription','contains','Elevation')|list|first %}
Timestamp: {{ i['values'][0]['value'][0]['dateTime'] }}
Elevation: {{ i['values'][0]['value'][0]['value'] }}
So you could do this for the elevation sensor:
value_template: >
{% set i = value_json['value']['timeSeries']|selectattr('variable.variableDescription','contains','Elevation')|list|first %}
{{ i['values'][0]['value'][0]['value'] }}
Better still, use the RESTful integration to get both from a single call, discarding everything else:
rest:
- scan_interval: 3600
resource: https://waterservices.usgs.gov/nwis/dv/?format=json&sites=02187010
sensor:
- name: "Lake elevation"
value_template: >
{% set i = value_json['value']['timeSeries']|selectattr('variable.variableDescription','contains','Elevation')|list|first %}
{{ i['values'][0]['value'][0]['value'] }}
unit_of_measurement: 'ft'
- name: "Lake elevation timestamp"
value_template: >
{% set i = value_json['value']['timeSeries']|selectattr('variable.variableDescription','contains','Elevation')|list|first %}
{{ i['values'][0]['value'][0]['dateTime'] }}
Heh. I’m getting quite good at this: