U.S. Geological Survey Latest Field Measurements API

openapi: 3.2.0
info:
  contact:
    name: US Geological Survey - Water Data for the Nation
    url: https://waterdata.usgs.gov
    x-ogc-serviceContact:
      addresses: []
      emails:
      - value: wdfn@usgs.gov
      hoursOfService: pointOfContact
      links:
      - href: https://waterdata.usgs.gov/questions-comments/?referrerUrl=https://api.waterdata.usgs.gov
        type: text/html
      name: WDFN Support
  description: 'The United States Geological Survey (USGS) collects water data at monitoring locations across the United States using both automated sensors and manual data collection. These APIs provide access to that data, alongside metadata about data collections and monitoring locations, in standardized machine-readable formats.

    '
  license:
    name: US Government work in the public domain
    url: https://creativecommons.org/publicdomain/zero/1.0/
  termsOfService: https://creativecommons.org/publicdomain/zero/1.0/
  title: USGS Water Data Latest Field Measurements API
  version: 0.71.7
  x-keywords:
  - geospatial
  - data
  - api
  - hydrology
  - USGS
servers:
- description: 'The United States Geological Survey (USGS) collects water data at monitoring locations across the United States using both automated sensors and manual data collection. These APIs provide access to that data, alongside metadata about data collections and monitoring locations, in standardized machine-readable formats.

    '
  url: https://api.waterdata.usgs.gov/ogcapi/v0
tags:
- description: 'Field measurements are physically measured values collected during a visit to the monitoring location. Field measurements consist of measurements of gage height and discharge, and readings of groundwater levels, and are primarily used as calibration readings for the automated sensors collecting continuous data. They are collected at a low frequency, and delivery of the data in WDFN may be delayed due to data processing time.

    '
  name: latest-field-measurements
paths:
  /collections/latest-field-measurements:
    get:
      description: 'Field measurements are physically measured values collected during a visit to the monitoring location. Field measurements consist of measurements of gage height and discharge, and readings of groundwater levels, and are primarily used as calibration readings for the automated sensors collecting continuous data. They are collected at a low frequency, and delivery of the data in WDFN may be delayed due to data processing time.

        '
      operationId: describeLatest-field-measurementsCollection
      parameters:
      - $ref: '#/components/parameters/f'
      - $ref: '#/components/parameters/lang'
      responses:
        '200':
          $ref: https://schemas.opengis.net/ogcapi/features/part1/1.0/openapi/ogcapi-features-1.yaml#/components/responses/Collection
        '400':
          $ref: https://schemas.opengis.net/ogcapi/features/part1/1.0/openapi/ogcapi-features-1.yaml#/components/responses/InvalidParameter
        '403':
          $ref: '#/components/responses/Forbidden403'
        '404':
          $ref: https://schemas.opengis.net/ogcapi/features/part1/1.0/openapi/ogcapi-features-1.yaml#/components/responses/NotFound
        '429':
          $ref: '#/components/responses/TooManyRequests429'
        '500':
          $ref: https://schemas.opengis.net/ogcapi/features/part1/1.0/openapi/ogcapi-features-1.yaml#/components/responses/ServerError
      summary: Get Latest field measurements metadata
      tags:
      - latest-field-measurements
  /collections/latest-field-measurements/items:
    get:
      description: 'Field measurements are physically measured values collected during a visit to the monitoring location. Field measurements consist of measurements of gage height and discharge, and readings of groundwater levels, and are primarily used as calibration readings for the automated sensors collecting continuous data. They are collected at a low frequency, and delivery of the data in WDFN may be delayed due to data processing time.

        '
      operationId: getLatest-field-measurementsFeatures
      parameters:
      - description: The optional f parameter indicates the output format which the server shall provide as part of the response document.  The default format is GeoJSON.
        explode: false
        in: query
        name: f
        required: false
        schema:
          default: json
          enum:
          - json
          - html
          - jsonld
          - csv
          type: string
        style: form
      - $ref: '#/components/parameters/lang'
      - $ref: '#/components/parameters/bbox'
      - description: The optional limit parameter limits the number of items that are presented in the response document (maximum=50000, default=10).
        explode: false
        in: query
        name: limit
        required: false
        schema:
          default: 10
          maximum: 50000
          minimum: 1
          type: integer
        style: form
      - $ref: '#/components/parameters/crs'
      - $ref: '#/components/parameters/bbox-crs'
      - description: The properties that should be included. The parameter value is a comma-separated list of property names.
        explode: false
        in: query
        name: properties
        required: false
        schema:
          items:
            enum:
            - field_measurements_series_id
            - field_visit_id
            - parameter_code
            - monitoring_location_id
            - observing_procedure_code
            - observing_procedure
            - value
            - unit_of_measure
            - time
            - qualifier
            - vertical_datum
            - approval_status
            - measuring_agency
            - last_modified
            - control_condition
            - measurement_rated
            - year
            - month
            - day
            - time_of_day
            type: string
          type: array
        style: form
      - $ref: '#/components/parameters/skipGeometry'
      - $ref: '#/components/parameters/wda_sortby'
      - $ref: '#/components/parameters/offset'
      - $ref: https://schemas.opengis.net/ogcapi/features/part1/1.0/openapi/ogcapi-features-1.yaml#/components/parameters/datetime
      - description: 'A unique identifier representing a single collection series. This corresponds to the `id` field in the `field-measurements-metadata` endpoint. Collection series are defined as the set of field measurements at a given monitoring location for a single parameter code using a single reading type.

          '
        explode: false
        in: query
        name: field_measurements_series_id
        required: false
        schema:
          description: 'A unique identifier representing a single collection series. This corresponds to the `id` field in the `field-measurements-metadata` endpoint. Collection series are defined as the set of field measurements at a given monitoring location for a single parameter code using a single reading type.

            '
          title: Field measurements series ID
          type: string
        style: form
      - description: 'A universally unique identifier (UUID) for the field visit. Multiple measurements may be made during a single field visit.

          '
        explode: false
        in: query
        name: field_visit_id
        required: false
        schema:
          description: 'A universally unique identifier (UUID) for the field visit. Multiple measurements may be made during a single field visit.

            '
          format: uuid
          title: Field visit ID
          type: string
        style: form
      - description: "Parameter codes are 5-digit codes used to identify the constituent measured and the units of measure. A complete list of parameter codes and associated groupings can be found at [https://api.waterdata.usgs.gov/ogcapi/v0/collections/parameter-codes/items](https://api.waterdata.usgs.gov/ogcapi/v0/collections/parameter-codes/items).\n Split parameters are enabled for this field, so you can supply multiple values separated by commas."
        explode: false
        in: query
        name: parameter_code
        required: false
        schema:
          description: "Parameter codes are 5-digit codes used to identify the constituent measured and the units of measure. A complete list of parameter codes and associated groupings can be found at [https://api.waterdata.usgs.gov/ogcapi/v0/collections/parameter-codes/items](https://api.waterdata.usgs.gov/ogcapi/v0/collections/parameter-codes/items).\n Split parameters are enabled for this field, so you can supply multiple values separated by commas."
          title: Parameter code
          type: string
        style: form
      - description: "A unique identifier representing a single monitoring location. This corresponds to the `id` field in the `monitoring-locations` endpoint. Monitoring location IDs are created by combining the agency code of the agency responsible for the monitoring location (e.g. USGS) with the ID number of the monitoring location (e.g. 02238500), separated by a hyphen (e.g. USGS-02238500).\n Split parameters are enabled for this field, so you can supply multiple values separated by commas."
        explode: false
        in: query
        name: monitoring_location_id
        required: false
        schema:
          description: "A unique identifier representing a single monitoring location. This corresponds to the `id` field in the `monitoring-locations` endpoint. Monitoring location IDs are created by combining the agency code of the agency responsible for the monitoring location (e.g. USGS) with the ID number of the monitoring location (e.g. 02238500), separated by a hyphen (e.g. USGS-02238500).\n Split parameters are enabled for this field, so you can supply multiple values separated by commas."
          title: Monitoring location ID
          type: string
        style: form
      - description: A short code corresponding to the observing procedure for the field measurement.
        explode: false
        in: query
        name: observing_procedure_code
        required: false
        schema:
          description: A short code corresponding to the observing procedure for the field measurement.
          title: Observing procedure code
          type: string
        style: form
      - description: Water measurement or water-quality observing procedure descriptions.
        explode: false
        in: query
        name: observing_procedure
        required: false
        schema:
          description: Water measurement or water-quality observing procedure descriptions.
          title: Observing procedure
          type: string
        style: form
      - description: 'The value of the observation. Values are transmitted as strings in the JSON response format in order to preserve precision.

          '
        explode: false
        in: query
        name: value
        required: false
        schema:
          description: 'The value of the observation. Values are transmitted as strings in the JSON response format in order to preserve precision.

            '
          title: Value
          type: string
        style: form
      - description: A human-readable description of the units of measurement associated with an observation.
        explode: false
        in: query
        name: unit_of_measure
        required: false
        schema:
          description: A human-readable description of the units of measurement associated with an observation.
          title: Unit of measure
          type: string
        style: form
      - description: "The date an observation represents. You can query this field using date-times or intervals, adhering to RFC 3339, or using ISO 8601 duration objects. Intervals may be bounded or half-bounded (double-dots at start or end).\nExamples:\n\n  - A date-time: \"2018-02-12T23:20:50Z\"\n  - A bounded interval: \"2018-02-12T00:00:00Z/2018-03-18T12:31:12Z\"\n  - Half-bounded intervals: \"2018-02-12T00:00:00Z/..\" or \"../2018-03-18T12:31:12Z\"\n  - Duration objects: \"P1M\" for data from the past month or \"PT36H\" for the last 36 hours\n\nOnly features that have a `time` that intersects the value of datetime are selected. If a feature has multiple temporal properties, it is the decision of the server whether only a single temporal property is used to determine the extent or all relevant temporal properties.\n"
        explode: false
        in: query
        name: time
        required: false
        schema:
          description: "The date an observation represents. You can query this field using date-times or intervals, adhering to RFC 3339, or using ISO 8601 duration objects. Intervals may be bounded or half-bounded (double-dots at start or end).\nExamples:\n\n  - A date-time: \"2018-02-12T23:20:50Z\"\n  - A bounded interval: \"2018-02-12T00:00:00Z/2018-03-18T12:31:12Z\"\n  - Half-bounded intervals: \"2018-02-12T00:00:00Z/..\" or \"../2018-03-18T12:31:12Z\"\n  - Duration objects: \"P1M\" for data from the past month or \"PT36H\" for the last 36 hours\n\nOnly features that have a `time` that intersects the value of datetime are selected. If a feature has multiple temporal properties, it is the decision of the server whether only a single temporal property is used to determine the extent or all relevant temporal properties.\n"
          title: Time
          type: string
        style: form
      - description: 'This field indicates any qualifiers associated with an observation, for instance if a sensor may have been impacted by ice or if values were estimated.

          '
        explode: false
        in: query
        name: qualifier
        required: false
        schema:
          description: 'This field indicates any qualifiers associated with an observation, for instance if a sensor may have been impacted by ice or if values were estimated.

            '
          title: Qualifier
          type: string
        style: form
      - description: 'The datum used to determine altitude and vertical position at the monitoring location. A list of codes is available at [https://api.waterdata.usgs.gov/ogcapi/v0/collections/altitude-datums/items](https://api.waterdata.usgs.gov/ogcapi/v0/collections/altitude-datums/items).

          '
        explode: false
        in: query
        name: vertical_datum
        required: false
        schema:
          description: 'The datum used to determine altitude and vertical position at the monitoring location. A list of codes is available at [https://api.waterdata.usgs.gov/ogcapi/v0/collections/altitude-datums/items](https://api.waterdata.usgs.gov/ogcapi/v0/collections/altitude-datums/items).

            '
          title: Vertical datum
          type: string
        style: form
      - description: 'Some of the data that you have obtained from this U.S. Geological Survey database may not have received Director''s approval.  Any such data values are qualified as provisional and are subject to revision.  Provisional data are released on the condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its use. This field reflects the approval status of each record, and is either "Approved", meaining processing review has been completed and the data is approved for publication, or "Provisional" and subject to revision. For more information about provisional data, go to [https://waterdata.usgs.gov/provisional-data-statement/](https://waterdata.usgs.gov/provisional-data-statement/).

          '
        explode: false
        in: query
        name: approval_status
        required: false
        schema:
          description: 'Some of the data that you have obtained from this U.S. Geological Survey database may not have received Director''s approval.  Any such data values are qualified as provisional and are subject to revision.  Provisional data are released on the condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its use. This field reflects the approval status of each record, and is either "Approved", meaining processing review has been completed and the data is approved for publication, or "Provisional" and subject to revision. For more information about provisional data, go to [https://waterdata.usgs.gov/provisional-data-statement/](https://waterdata.usgs.gov/provisional-data-statement/).

            '
          enum:
          - Provisional
          - Approved
          title: Approval Status
          type: string
        style: form
      - description: The agency performing the measurement.
        explode: false
        in: query
        name: measuring_agency
        required: false
        schema:
          description: The agency performing the measurement.
          title: Measuring agency
          type: string
        style: form
      - description: "The last time a record was refreshed in our database. This may happen due to regular operational processes and does not necessarily indicate anything about the measurement has changed.\nYou can query this field using date-times or intervals, adhering to RFC 3339, or using ISO 8601 duration objects. Intervals may be bounded or half-bounded (double-dots at start or end).\nExamples:\n\n  - A date-time: \"2018-02-12T23:20:50Z\"\n  - A bounded interval: \"2018-02-12T00:00:00Z/2018-03-18T12:31:12Z\"\n  - Half-bounded intervals: \"2018-02-12T00:00:00Z/..\" or \"../2018-03-18T12:31:12Z\"\n  - Duration objects: \"P1M\" for data from the past month or \"PT36H\" for the last 36 hours\n\nOnly features that have a `last_modified` that intersects the value of datetime are selected.\n"
        explode: false
        in: query
        name: last_modified
        required: false
        schema:
          description: "The last time a record was refreshed in our database. This may happen due to regular operational processes and does not necessarily indicate anything about the measurement has changed.\nYou can query this field using date-times or intervals, adhering to RFC 3339, or using ISO 8601 duration objects. Intervals may be bounded or half-bounded (double-dots at start or end).\nExamples:\n\n  - A date-time: \"2018-02-12T23:20:50Z\"\n  - A bounded interval: \"2018-02-12T00:00:00Z/2018-03-18T12:31:12Z\"\n  - Half-bounded intervals: \"2018-02-12T00:00:00Z/..\" or \"../2018-03-18T12:31:12Z\"\n  - Duration objects: \"P1M\" for data from the past month or \"PT36H\" for the last 36 hours\n\nOnly features that have a `last_modified` that intersects the value of datetime are selected.\n"
          title: Last modified date
          type: string
        style: form
      - description: 'The state of the control feature at the time of observation.

          '
        explode: false
        in: query
        name: control_condition
        required: false
        schema:
          description: 'The state of the control feature at the time of observation.

            '
          title: Control condition
          type: string
        style: form
      - description: 'A qualitative estimate of the quality of a measurement.

          '
        explode: false
        in: query
        name: measurement_rated
        required: false
        schema:
          description: 'A qualitative estimate of the quality of a measurement.

            '
          title: Measurement rating
          type: string
        style: form
      - description: 'The calendar year the field measurement was taken.

          '
        explode: false
        in: query
        name: year
        required: false
        schema:
          description: 'The calendar year the field measurement was taken.

            '
          title: Year
          type: integer
        style: form
      - description: 'The calendar month the field measurement was taken. If null, the month is unknown.

          '
        explode: false
        in: query
        name: month
        required: false
        schema:
          description: 'The calendar month the field measurement was taken. If null, the month is unknown.

            '
          title: Month
          type: integer
        style: form
      - description: 'The day of the month the field measurement was taken. If null, the day is unknown.

          '
        explode: false
        in: query
        name: day
        required: false
        schema:
          description: 'The day of the month the field measurement was taken. If null, the day is unknown.

            '
          title: Day
          type: integer
        style: form
      - description: 'The time of day the field measurement was taken. If null, the time of day is unknown.

          '
        explode: false
        in: query
        name: time_of_day
        required: false
        schema:
          description: 'The time of day the field measurement was taken. If null, the time of day is unknown.

            '
          format: time
          title: Time of Day
          type: string
        style: form
      - description: 'The agency that is reporting the data. Agency codes are fixed values assigned by the National Water Information System (NWIS). A list of agency codes is available at [https://api.waterdata.usgs.gov/ogcapi/v0/collections/agency-codes/items](https://api.waterdata.usgs.gov/ogcapi/v0/collections/agency-codes/items).

          '
        explode: false
        in: query
        name: agency_code
        required: false
        schema:
          description: 'The agency that is reporting the data. Agency codes are fixed values assigned by the National Water Information System (NWIS). A list of agency codes is available at [https://api.waterdata.usgs.gov/ogcapi/v0/collections/agency-codes/items](https://api.waterdata.usgs.gov/ogcapi/v0/collections/agency-codes/items).

            '
          title: Agency code
          type: string
        style: form
      - description: 'The name of the agency that is reporting the data.

          '
        explode: false
        in: query
        name: agency_name
        required: false
        schema:
          description: 'The name of the agency that is reporting the data.

            '
          title: Agency name
          type: string
        style: form
      - description: 'Altitude of the monitoring location referenced to the specified Vertical Datum.

          '
        explode: false
        in: query
        name: altitude
        required: false
        schema:
          description: 'Altitude of the monitoring location referenced to the specified Vertical Datum.

            '
          title: Altitude
          type: number
        style: form
      - description: 'Accuracy of the altitude, in feet. An accuracy of +/- 0.1 foot would be entered as “.1”. Many altitudes are interpolated from the contours on topographic maps; accuracies determined in this way are generally entered as one-half of the contour interval.

          '
        explode: false
        in: query
        name: altitude_accuracy
        required: false
        schema:
          description: 'Accuracy of the altitude, in feet. An accuracy of +/- 0.1 foot would be entered as “.1”. Many altitudes are interpolated from the contours on topographic maps; accuracies determined in this way are generally entered as one-half of the contour interval.

            '
          title: Altitude accuracy
          type: number
        style: form
      - description: 'Codes representing the method used to measure altitude.

          '
        explode: false
        in: query
        name: altitude_method_code
        required: false
        schema:
          description: 'Codes representing the method used to measure altitude.

            '
          title: Altitude method code
          type: string
        style: form
      - description: 'The name of the method used to measure altitude.

          '
        explode: false
        in: query
        name: altitude_method_name
        required: false
        schema:
          description: 'The name of the method used to measure altitude.

            '
          title: Altitude method name
          type: string
        style: form
      - description: 'Local aquifers in the USGS water resources data base are identified by a geohydrologic unit code (a three-digit number related to the age of the formation, followed by a 4 or 5 character abbreviation for the geologic unit or aquifer name).

          '
        explode: false
        in: query
        name: aquifer_code
        required: false
        schema:
          description: 'Local aquifers in the USGS water resources data base are identified by a geohydrologic unit code (a three-digit number related to the age of the formation, followed by a 4 or 5 character abbreviation for the geologic unit or aquifer name).

            '
          title: Aquifer code
          type: string
        style: form
      - description: 'Describes the confinement status of an aquifer at the monitoring location. A confined aquifer is an aquifer below the land surface that is saturated with water. A water table--or unconfined--aquifer is an aquifer whose upper water surface (water table) is at atmospheric pressure, and thus is able to rise and fall.

          '
        explode: false
        in: query
        name: aquifer_type_code
        required: false
        schema:
          description: 'Describes the confinement status of an aquifer at the monitoring location. A confined aquifer is an aquifer below the land surface that is saturated with water. A water table--or unconfined--aquifer is an aquifer whose upper water surface (water table) is at atmospheric pressure, and thus is able to rise and fall.

            '
          title: Aquifer type code
          type: string
        style: form
      - description: 'The Basin Code or "drainage basin code" is a two-digit code that further subdivides the 8-digit hydrologic-unit code. The drainage basin code is defined by the USGS State Office where the monitoring location is located.

          '
        explode: false
        in: query
        name: basin_code
        required: false
        schema:
          description: 'The Basin Code or "drainage basin code" is a two-digit code that further subdivides the 8-digit hydrologic-unit code. The drainage basin code is defined by the USGS State Office where the monitoring location is located.

            '
          title: Basin code
          type: string
        style: form
      - description: 'Date the well was completed.

          '
        explode: false
        in: query
        name: construction_date
        required: false
        schema:
          description: 'Date the well was completed.

            '
          title: Construction date
          type: string
        style: form
      - description: 'The contributing drainage area of a lake, stream, wetland, or estuary monitoring location, in square miles. This item should be present only if the contributing area is different from the total drainage area. This situation can occur when part of the drainage area consists of very porous soil or depressions that either allow all runoff to enter the groundwater or traps the water in ponds so that rainfall does not contribute to runoff. A transbasin diversion can also affect the total drainage area.

          '
        explode: false
        in: query
        name: contributing_drainage_area
        required: false
        schema:
          description: 'The contributing drainage area of a lake, stream, wetland, or estuary monitoring location, in square miles. This item should be present only if the contributing area is different from the total drainage area. This situation can occur when part of the drainage area consists of very porous soil or depressions that either allow all runoff to enter the groundwater or traps the water in ponds so that rainfall does not contribute to runoff. A transbasin diversion can also affect the total drainage area.

            '
          title: Contributing drainage area
          type: number
        style: form
      - description: 'The code for the country in which the monitoring location is located.

          '
        explode: false
        in: query
        name: country_code
        required: false
        schema:
          description: 'The code for the country in which the monitoring location is located.

            '
          title: Country code
          type: string
        style: form
      - description: 'The name of the country in which the monitoring location is located.

          '
        explode: false
        in: query
        name: country_name
        required: false
        schema:
          description: 'The name of the country in which the monitoring location is located.

            '
          title: Country name
          type: string
        style: form
      - description: 'The code for the county or county equivalent (parish, borough, etc.) in which the monitoring location is located. A list of codes is available at [https://api.waterdata.usgs.gov/ogcapi/v0/collections/counties/items](https://api.waterdata.usgs.gov/ogcapi/v0/collections/counties/items).

          '
        explode: false
        in: query
        name: county_code
        required: false
        schema:
          description: 'The code for the county or county equivalent (parish, borough, etc.) in which the monitoring location is located. A list of codes is available at [https://api.waterdata.usgs.gov/ogcapi/v0/collections/counties/items](https://api.waterdata.usgs.gov/ogcapi/v0/collections/counties/items).

            '
          title: County code
          type: string
        style: form
      - description: 'The name of the county or county equivalent (parish, borough, etc.) in which the monitoring location is located. [A list of codes is available at [https://api.waterdata.usgs.gov/ogcapi/v0/collections/counties/items](https://api.waterdata.usgs.gov/ogcapi/v0/collections/counties/items).

          '
        explode: false
        in: query
        name: county_name
        required: false
        schema:
          description: 'The name of the county or county equivalent (parish, borough, etc.) in which the monitoring location is located. [A list of codes is available at [https://api.waterdata.usgs.gov/ogcapi/v0/collections/counties/items](https://api.waterdata.usgs.gov/ogcapi/v0/collections/counties/items).

            '
          title: County name
          type: string
        style: form
      - description: 'A code indicating the source of water-level data.

          '
        explode: false
        in: query
        name: depth_source_code
        required: false
        schema:
          description: 'A code indicating the source of water-level data.

            '
          title: Depth source code
          type: string
        style: form
      - description: 'The Water Science Centers (WSCs) across the United States use the FIPS state code as the district code. In some case, monitoring locations and samples may be managed by a water science center that is adjacent to the state in which the monitoring location actually resides. For example a monitoring location may have a district code of 30 which translates to Montana, but the state code could be 56 for Wyoming because that is where the monitoring location actually is located.

          '
        explode: false
        in: query
        name: district_code
        required: false
        schema:
          description: 'The Water Science Centers (WSCs) across the United States use the FIPS state code as the district code. In some case, monitoring locations and samples may be managed by a water science center that is adjacent to the state in which the monitoring location actually resides. For example a monitoring location may have a district code of 30 which translates to Montana, but the state code could be 56 for Wyoming because that is where the monitoring location actually is located.

            '
          title: District code
          type: string
        style: form
      - description: 'The area enclosed by a topographic divide from which direct surface runoff from precipitation normally drains by gravity into the stream above that point.

          '
        explode: false
        in: query
        name: drainage_area
        required: false
        schema:
          description: 'The area enclosed by a topographic divide from which direct surface runoff from precipitation normally drains by gravity into the stream above that point.

            '
  

# --- truncated at 32 KB (81 KB total) ---
# Full source: https://raw.githubusercontent.com/api-evangelist/u-s-geological-survey/refs/heads/main/openapi/u-s-geological-survey-latest-field-measurements-api-openapi.yml