# Reanalysis

Query reanalysis data from models like ARCO ERA5 for historical weather analysis.

## Query reanalysis data

> Query reanalysis data from models like ARCO ERA5.\
> \
> Reanalysis data provides historical weather analysis at a specific time (unlike forecasts\
> which have init\_time + prediction\_timedelta dimensions). This is useful for:\
> \- Historical weather analysis\
> \- Training and validating machine learning models\
> \- Comparing forecasts against actuals\
> \
> \*\*Query Dimensions:\*\*\
> \- \`models\`: Reanalysis model(s) to query (e.g., \["arco\_era5"])\
> \- \`geo\`: Location filter (point, bounding\_box, polygon, market\_zone, country\_key)\
> \- \`time\`: Time(s) to query - "latest", single datetime, list of datetimes, or time range\
> \- \`variables\`: Weather variables to retrieve\
> \
> \*\*Response Formats:\*\*\
> \- \`json\`: Columnar JSON format \`{column: \[values], ...}\`\
> \- \`arrow\`: Apache Arrow IPC stream for efficient processing\
> \
> \*\*Authentication\*\*: Requires API key.\
> \
> For more information, see \[docs.jua.ai]\(<https://docs.jua.ai>).

````json
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The id and label are optional\nmetadata - id can be used by data sources that need identifiers (e.g., station IDs),\nand label provides a human-readable name for display purposes."},"TimeSlice":{"properties":{"start":{"type":"string","format":"date-time","title":"Start","description":"Start datetime (inclusive)"},"end":{"type":"string","format":"date-time","title":"End","description":"End datetime (inclusive) in ISO 8601 format"}},"type":"object","required":["start","end"],"title":"TimeSlice","description":"Time range for querying forecasts between two datetime values."},"PreferredHours":{"properties":{"type":{"type":"string","title":"Type","default":"preferred_hours"},"selections":{"items":{"$ref":"#/components/schemas/PreferredHoursSelection"},"type":"array","title":"Selections","description":"List of {hour, offset} pairs to select"}},"type":"object","title":"PreferredHours","description":"Select specific forecast runs by UTC hour and per-hour offset.\n\nEach selection picks the Nth most recent available run at a given UTC hour.\nExample: selections=[{hour:6, offset:0}, {hour:6, offset:2}, {hour:18, offset:0}]\nresolves to today's 6am, day-before-yesterday's 6am, and today's 6pm."},"PreferredHoursSelection":{"properties":{"hour":{"type":"integer","maximum":23,"minimum":0,"title":"Hour","description":"UTC hour (0-23)"},"offset":{"type":"integer","minimum":0,"title":"Offset","description":"0 = most recent run at this hour, 1 = previous, etc.","default":0}},"type":"object","required":["hour"],"title":"PreferredHoursSelection","description":"A single preferred-hour run selection.\n\nPicks the Nth most recent run at a given UTC hour."},"CustomerVariable":{"type":"string","enum":["air_temperature_at_height_level_2m","surface_temperature","dew_point_temperature_at_height_level_2m","relative_humidity_at_height_level_2m","air_pressure_at_mean_sea_level","surface_air_pressure","wind_speed_at_height_level_10m","wind_direction_at_height_level_10m","wind_speed_at_height_level_100m","wind_direction_at_height_level_100m","wind_speed_at_height_level_20m","wind_speed_at_height_level_40m","wind_speed_at_height_level_60m","wind_speed_at_height_level_80m","wind_speed_at_height_level_120m","wind_speed_at_height_level_140m","wind_speed_at_height_level_160m","wind_speed_at_height_level_180m","wind_speed_at_height_level_200m","wind_direction_at_height_level_200m","air_density_at_height_level_2m","geopotential_at_pressure_level_50000Pa","eastward_wind_at_height_level_10m","northward_wind_at_height_level_10m","eastward_wind_at_height_level_100m","northward_wind_at_height_level_100m","wind_speed_of_gust_at_height_level_10m_max","surface_direct_downwelling_shortwave_flux_sum_1h","surface_downwelling_longwave_flux_sum_1h","surface_downwelling_shortwave_flux_sum_1h","surface_downwelling_shortwave_flux_sum_30min","surface_direct_downwelling_shortwave_flux_sum_30min","toa_bidirectional_reflectance_560_710nm","toa_bidirectional_reflectance_1500_1780nm","toa_brightness_temperature_3480_4360nm","toa_brightness_temperature_9800_11800nm","surface_downwelling_longwave_flux_sum_6h","surface_downwelling_shortwave_flux_sum_6h","surface_net_downward_longwave_flux_sum_1h","surface_net_downward_shortwave_flux_sum_1h","surface_net_downward_longwave_flux_sum_6h","surface_net_downward_shortwave_flux_sum_6h","surface_direct_along_beam_shortwave_flux_sum_6h","cloud_area_fraction_at_entire_atmosphere","cloud_area_fraction_at_entire_atmosphere_high_type","cloud_area_fraction_at_entire_atmosphere_medium_type","cloud_area_fraction_at_entire_atmosphere_low_type","precipitation_amount_sum_1h","precipitation_amount_sum_3h","precipitation_amount_sum_6h","precipitation_amount_sum_12h","precipitation_amount_sum_24h","atmosphere_convective_available_potential_energy","predominant_precipitation_type_at_surface","sea_surface_temperature","snowfall_sum_1h","surface_runoff_sum_1h","sub_surface_runoff_sum_1h","surface_sensible_heat_flux_sum_1h","surface_latent_heat_flux_sum_1h","maximum_temperature_at_height_level_2m_24h","minimum_temperature_at_height_level_2m_24h","snow_depth","temperature_in_ground_at_layer_below_ground_0.00m","volume_fraction_of_condensed_water_in_soil_at_layer_below_ground_0.00m","volume_fraction_of_condensed_water_in_soil_at_layer_below_ground_0.07m","volume_fraction_of_condensed_water_in_soil_at_layer_below_ground_0.28m","volume_fraction_of_condensed_water_in_soil_at_layer_below_ground_1.00m"],"title":"CustomerVariable","description":"Weather variable name with units:\n  • air_temperature_at_height_level_2m: K\n  • surface_temperature: K\n  • dew_point_temperature_at_height_level_2m: K\n  • relative_humidity_at_height_level_2m: %\n  • air_pressure_at_mean_sea_level: Pa\n  • surface_air_pressure: Pa\n  • wind_speed_at_height_level_10m: m/s\n  • wind_direction_at_height_level_10m: degrees\n  • wind_speed_at_height_level_100m: m/s\n  • wind_direction_at_height_level_100m: degrees\n  • wind_speed_at_height_level_20m: m/s\n  • wind_speed_at_height_level_40m: m/s\n  • wind_speed_at_height_level_60m: m/s\n  • wind_speed_at_height_level_80m: m/s\n  • wind_speed_at_height_level_120m: m/s\n  • wind_speed_at_height_level_140m: m/s\n  • wind_speed_at_height_level_160m: m/s\n  • wind_speed_at_height_level_180m: m/s\n  • wind_speed_at_height_level_200m: m/s\n  • wind_direction_at_height_level_200m: degrees\n  • air_density_at_height_level_2m: kg/m³\n  • geopotential_at_pressure_level_50000Pa: m²/s²\n  • eastward_wind_at_height_level_10m: m/s\n  • northward_wind_at_height_level_10m: m/s\n  • eastward_wind_at_height_level_100m: m/s\n  • northward_wind_at_height_level_100m: m/s\n  • wind_speed_of_gust_at_height_level_10m_max: m/s\n  • surface_direct_downwelling_shortwave_flux_sum_1h: J/m²\n  • surface_downwelling_longwave_flux_sum_1h: J/m²\n  • surface_downwelling_shortwave_flux_sum_1h: J/m²\n  • surface_downwelling_shortwave_flux_sum_30min: J/m²\n  • surface_direct_downwelling_shortwave_flux_sum_30min: J/m²\n  • toa_bidirectional_reflectance_560_710nm: \n  • toa_bidirectional_reflectance_1500_1780nm: \n  • toa_brightness_temperature_3480_4360nm: \n  • toa_brightness_temperature_9800_11800nm: \n  • surface_downwelling_longwave_flux_sum_6h: J/m²\n  • surface_downwelling_shortwave_flux_sum_6h: J/m²\n  • surface_net_downward_longwave_flux_sum_1h: J/m²\n  • surface_net_downward_shortwave_flux_sum_1h: J/m²\n  • surface_net_downward_longwave_flux_sum_6h: J/m²\n  • surface_net_downward_shortwave_flux_sum_6h: J/m²\n  • surface_direct_along_beam_shortwave_flux_sum_6h: J/m²\n  • cloud_area_fraction_at_entire_atmosphere: fraction (0-1)\n  • cloud_area_fraction_at_entire_atmosphere_high_type: fraction (0-1)\n  • cloud_area_fraction_at_entire_atmosphere_medium_type: fraction (0-1)\n  • cloud_area_fraction_at_entire_atmosphere_low_type: fraction (0-1)\n  • precipitation_amount_sum_1h: mm\n  • precipitation_amount_sum_3h: mm\n  • precipitation_amount_sum_6h: mm\n  • precipitation_amount_sum_12h: mm\n  • precipitation_amount_sum_24h: mm\n  • atmosphere_convective_available_potential_energy: J/kg\n  • predominant_precipitation_type_at_surface: categorical\n  • sea_surface_temperature: K\n  • snowfall_sum_1h: mm\n  • surface_runoff_sum_1h: mm\n  • sub_surface_runoff_sum_1h: mm\n  • surface_sensible_heat_flux_sum_1h: W/m²\n  • surface_latent_heat_flux_sum_1h: W/m²\n  • maximum_temperature_at_height_level_2m_24h: K\n  • minimum_temperature_at_height_level_2m_24h: K\n  • snow_depth: m\n  • temperature_in_ground_at_layer_below_ground_0.00m: K\n  • volume_fraction_of_condensed_water_in_soil_at_layer_below_ground_0.00m: m³/m³\n  • volume_fraction_of_condensed_water_in_soil_at_layer_below_ground_0.07m: m³/m³\n  • volume_fraction_of_condensed_water_in_soil_at_layer_below_ground_0.28m: m³/m³\n  • volume_fraction_of_condensed_water_in_soil_at_layer_below_ground_1.00m: m³/m³"},"GroupByKey":{"properties":{"field":{"type":"string","enum":["model","init_time","time","prediction_timedelta","ensemble_member","market_zone","country_key","point","latitude","longitude","day_of_year","hour"],"title":"Field"},"transformation":{"anyOf":[{"type":"string","const":"to_start_of"},{"type":"null"}],"title":"Transformation"},"parameters_list":{"anyOf":[{"items":{"type":"string"},"type":"array"},{"type":"null"}],"title":"Parameters List"}},"type":"object","required":["field"],"title":"GroupByKey","description":"Structured representation of a group-by key.\n\n- field: one of supported base fields\n- transformation: optional transformation name (currently only 'to_start_of')\n- parameters_list: optional list of parameters for the transformation"},"OrderByItem_Union_ReanalysisCoordinates__CustomerVariable__":{"properties":{"field":{"anyOf":[{"$ref":"#/components/schemas/ReanalysisCoordinates"},{"$ref":"#/components/schemas/CustomerVariable"}],"title":"Field","description":"Field to sort by"},"direction":{"$ref":"#/components/schemas/SortDirection","description":"Sort direction: 'asc' (default) or 'desc'","default":"asc"},"aggregation":{"anyOf":[{"type":"string","enum":["avg","std","min","max","sum","count","median","quantile","argmin","argmax"]},{"type":"null"}],"title":"Aggregation","description":"Aggregation function when ordering by variable"}},"type":"object","required":["field"],"title":"OrderByItem[Union[ReanalysisCoordinates, CustomerVariable]]"},"ReanalysisCoordinates":{"type":"string","enum":["model","time","latitude","longitude","point","market_zone","country_key"],"title":"ReanalysisCoordinates","description":"Coordinate dimensions available for reanalysis queries."},"SortDirection":{"type":"string","enum":["asc","desc"],"title":"SortDirection","description":"Sort direction for ORDER BY clauses."},"Aggregation":{"properties":{"aggregation":{"type":"string","enum":["avg","std","min","max","sum","count","median","quantile","argmin","argmax"],"title":"Aggregation","description":"Aggregation function name."},"parameters":{"anyOf":[{"items":{},"type":"array"},{"type":"null"}],"title":"Parameters","description":"Parameters for parameterized aggregations.Example: 'quantile': [0.5] for median, [0.95] for 95th percentile, etc."},"variables":{"anyOf":[{"items":{"$ref":"#/components/schemas/CustomerVariable"},"type":"array"},{"type":"null"}],"title":"Variables","description":"Specific variables to aggregate. If None, applies to all variables in the query"}},"type":"object","required":["aggregation"],"title":"Aggregation","description":"Aggregation function to apply when grouping forecast data.\n\nSupported aggregations:\n- Basic: avg, std, min, max, sum, count, median\n- Parameterized: quantile_(p), argmin_(col), argmax_(col)\n\nFor argmin/argmax, the parameter is the column to return, and the variable\nis the column to find the min/max of. Example:\n    argmin_(time)__temperature -> returns time when temperature is minimum\n\nCan be applied to specific variables or all variables in the query."},"Weighting":{"properties":{"type":{"type":"string","enum":["wind_capacity","wind_capacity_combined","solar_capacity","population"],"title":"Type","description":"Weighting type for geographic aggregation. 'wind_capacity': Weight by installed wind power capacity. 'solar_capacity': Weight by installed solar power capacity. 'population': Weight by population density"},"unit":{"type":"string","enum":["weather","mw"],"title":"Unit","description":"Output unit. 'weather': return capacity-weighted raw weather values E[wu]. 'mw': apply power curves in ClickHouse and return predicted MW.","default":"weather"}},"type":"object","required":["type"],"title":"Weighting","description":"Weighting scheme for aggregating forecast data over geographic areas.\n\nApplies weighted averages based on capacity or population distribution within\nthe queried area."},"Pagination":{"properties":{"limit":{"type":"integer","title":"Limit","default":100},"offset":{"type":"integer","title":"Offset","default":0}},"type":"object","title":"Pagination"},"HTTPValidationError":{"properties":{"detail":{"items":{"$ref":"#/components/schemas/ValidationError"},"type":"array","title":"Detail"}},"type":"object","title":"HTTPValidationError"},"ValidationError":{"properties":{"loc":{"items":{"anyOf":[{"type":"string"},{"type":"integer"}]},"type":"array","title":"Location"},"msg":{"type":"string","title":"Message"},"type":{"type":"string","title":"Error Type"},"input":{"title":"Input"},"ctx":{"type":"object","title":"Context"}},"type":"object","required":["loc","msg","type"],"title":"ValidationError"}}}}
````

## Get reanalysis dataset metadata

> Get metadata about available reanalysis models including:\
> \- Model names and display names\
> \- Grid resolution and temporal resolution\
> \- Available variables\
> \
> \*\*Authentication\*\*: Requires API key.

```json
{"openapi":"3.1.0","info":{"title":"Jua Query Engine API","version":"0.1.0"},"tags":[{"name":"reanalysis","description":"Query reanalysis data from models like ARCO ERA5 for historical weather analysis."}],"security":[{"HTTPBearer":[]}],"paths":{"/v1/reanalysis/meta":{"get":{"tags":["reanalysis"],"summary":"Get reanalysis dataset metadata","description":"Get metadata about available reanalysis models including:\n- Model names and display names\n- Grid resolution and temporal resolution\n- Available variables\n\n**Authentication**: Requires API key.","operationId":"get_reanalysis_meta_v1_reanalysis_meta_get","responses":{"200":{"description":"Successfully retrieved metadata","content":{"application/json":{"schema":{"$ref":"#/components/schemas/ReanalysisMetaResult"}}}},"401":{"description":"Authentication required"}}}}},"components":{"schemas":{"ReanalysisMetaResult":{"properties":{"models":{"items":{"$ref":"#/components/schemas/ReanalysisModelInfo"},"type":"array","title":"Models"}},"type":"object","required":["models"],"title":"ReanalysisMetaResult","description":"Metadata about available reanalysis models."},"ReanalysisModelInfo":{"properties":{"name":{"type":"string","title":"Name"},"display_name":{"type":"string","title":"Display Name"},"grid_resolution":{"type":"string","title":"Grid Resolution"},"temporal_resolution_minutes":{"type":"integer","title":"Temporal Resolution Minutes"},"variables":{"items":{"type":"string"},"type":"array","title":"Variables"},"variable_units":{"additionalProperties":{"type":"string"},"type":"object","title":"Variable Units","default":{}}},"type":"object","required":["name","display_name","grid_resolution","temporal_resolution_minutes","variables"],"title":"ReanalysisModelInfo","description":"Information about a reanalysis model."}}}}
```

## Get latest available timestamp

> Get the latest available timestamp for each specified reanalysis model.\
> \
> This is useful for knowing what data is currently available without making a full query.\
> \
> \*\*Authentication\*\*: Requires API key.

```json
{"openapi":"3.1.0","info":{"title":"Jua Query Engine API","version":"0.1.0"},"tags":[{"name":"reanalysis","description":"Query reanalysis data from models like ARCO ERA5 for historical weather analysis."}],"security":[{"HTTPBearer":[]}],"paths":{"/v1/reanalysis/latest-timestamp":{"get":{"tags":["reanalysis"],"summary":"Get latest available timestamp","description":"Get the latest available timestamp for each specified reanalysis model.\n\nThis is useful for knowing what data is currently available without making a full query.\n\n**Authentication**: Requires API key.","operationId":"get_latest_timestamp_v1_reanalysis_latest_timestamp_get","parameters":[{"name":"models","in":"query","required":false,"schema":{"type":"array","items":{"type":"string"},"description":"List of reanalysis models to check","default":["arco_era5"],"title":"Models"},"description":"List of reanalysis models to check"}],"responses":{"200":{"description":"Successfully retrieved latest timestamps","content":{"application/json":{"schema":{"$ref":"#/components/schemas/LatestTimestampResult"}}}},"401":{"description":"Authentication required"},"422":{"description":"Validation Error","content":{"application/json":{"schema":{"$ref":"#/components/schemas/HTTPValidationError"}}}}}}}},"components":{"schemas":{"LatestTimestampResult":{"properties":{"timestamps":{"additionalProperties":{"type":"string","format":"date-time"},"type":"object","title":"Timestamps"}},"type":"object","required":["timestamps"],"title":"LatestTimestampResult","description":"Result containing latest timestamps per model."},"HTTPValidationError":{"properties":{"detail":{"items":{"$ref":"#/components/schemas/ValidationError"},"type":"array","title":"Detail"}},"type":"object","title":"HTTPValidationError"},"ValidationError":{"properties":{"loc":{"items":{"anyOf":[{"type":"string"},{"type":"integer"}]},"type":"array","title":"Location"},"msg":{"type":"string","title":"Message"},"type":{"type":"string","title":"Error Type"},"input":{"title":"Input"},"ctx":{"type":"object","title":"Context"}},"type":"object","required":["loc","msg","type"],"title":"ValidationError"}}}}
```

## Get available timestamps

> Get a list of available timestamps for each specified reanalysis model within an optional\
> time range.\
> \
> \*\*Authentication\*\*: Requires API key.

```json
{"openapi":"3.1.0","info":{"title":"Jua Query Engine API","version":"0.1.0"},"tags":[{"name":"reanalysis","description":"Query reanalysis data from models like ARCO ERA5 for historical weather analysis."}],"security":[{"HTTPBearer":[]}],"paths":{"/v1/reanalysis/available-timestamps":{"get":{"tags":["reanalysis"],"summary":"Get available timestamps","description":"Get a list of available timestamps for each specified reanalysis model within an optional\ntime range.\n\n**Authentication**: Requires API key.","operationId":"get_available_timestamps_v1_reanalysis_available_timestamps_get","parameters":[{"name":"models","in":"query","required":false,"schema":{"type":"array","items":{"type":"string"},"description":"List of reanalysis models to check","default":["arco_era5"],"title":"Models"},"description":"List of reanalysis models to check"},{"name":"since","in":"query","required":false,"schema":{"anyOf":[{"type":"string","format":"date-time"},{"type":"null"}],"description":"Only return timestamps >= this time (inclusive)","title":"Since"},"description":"Only return timestamps >= this time (inclusive)"},{"name":"before","in":"query","required":false,"schema":{"anyOf":[{"type":"string","format":"date-time"},{"type":"null"}],"description":"Only return timestamps < this time (exclusive)","title":"Before"},"description":"Only return timestamps < this time (exclusive)"},{"name":"limit","in":"query","required":false,"schema":{"type":"integer","maximum":1000,"minimum":1,"description":"Maximum number of timestamps to return","default":100,"title":"Limit"},"description":"Maximum number of timestamps to return"}],"responses":{"200":{"description":"Successfully retrieved available timestamps","content":{"application/json":{"schema":{"$ref":"#/components/schemas/AvailableTimestampsResult"}}}},"401":{"description":"Authentication required"},"422":{"description":"Validation Error","content":{"application/json":{"schema":{"$ref":"#/components/schemas/HTTPValidationError"}}}}}}}},"components":{"schemas":{"AvailableTimestampsResult":{"properties":{"timestamps":{"additionalProperties":{"items":{"type":"string","format":"date-time"},"type":"array"},"type":"object","title":"Timestamps"}},"type":"object","required":["timestamps"],"title":"AvailableTimestampsResult","description":"Result containing available timestamps per model."},"HTTPValidationError":{"properties":{"detail":{"items":{"$ref":"#/components/schemas/ValidationError"},"type":"array","title":"Detail"}},"type":"object","title":"HTTPValidationError"},"ValidationError":{"properties":{"loc":{"items":{"anyOf":[{"type":"string"},{"type":"integer"}]},"type":"array","title":"Location"},"msg":{"type":"string","title":"Message"},"type":{"type":"string","title":"Error Type"},"input":{"title":"Input"},"ctx":{"type":"object","title":"Context"}},"type":"object","required":["loc","msg","type"],"title":"ValidationError"}}}}
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.jua.ai/api-v2/query-engine/open-api-reference/reanalysis.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.