Fig. 18. Mayfly Occurrence Data
Geo-referenced records of Ephemeroptera (mayfly) occurrences in the United States. The dataset includes the geographic coordinates (longitude, latitude), provider name (Global Biodiversity Information Facility [GBIF]), date reported, and month reported. This data is featured as a map in the Presence, Patterns, and Predictions: Environmental DNA and Community Science data story.
Data source:
Ephemeroptera in GBIF Secretariat (2017). GBIF Backbone Taxonomy. Checklist dataset https://doi.org/10.15468/39omei accessed via GBIF.org on 2019-06-26.
Data dictionary
Field definitions supplied by the publishing agency in CKAN.
| Column | Type | Label | Description |
|---|---|---|---|
| name | text | name | — |
| longitude | numeric | longitude | — |
| latitude | numeric | latitude | — |
| provider | text | provider | — |
| date | date | date | — |
| key | numeric | key | — |
| dtime | date | dtime | — |
| month | text | month | — |
Resource details
| Format | CSV |
|---|---|
| Size | 129 KB |
| Rows | 1,964 |
| Last updated | Sep 29, 2026 |
| Part of | 2019 California Water Quality Status Report |
Other resources in this dataset
- Fig. 1. California's Groundwater
- Fig. 2. 1,2,3,-Trichloropropane
- Fig. 3. Toxicity and Urban Land Use
- Fig. 4-5. Sum Pyrethroid Toxic Units
- Fig. 7. Elk River Sediment Loads
- Fig. 10. FHABs Illnesses by County (2018)
- Fig. 11. Sampling stations for long-term bass lake monitoring.
- Fig. 20. Stream Quality Index Map
CKAN Data API
Access resource data through the CKAN DataStore API. The examples below use this resource's ID.
Endpoints
The Data API provides these actions. Creating or updating records requires appropriate permissions; the query actions read public DataStore records.
| Create | https://ckan.cdt.dev.datopian.com/api/3/action/datastore_create |
|---|---|
| Update / insert | https://ckan.cdt.dev.datopian.com/api/3/action/datastore_upsert |
| Query | https://ckan.cdt.dev.datopian.com/api/3/action/datastore_search |
| Query via SQL | https://ckan.cdt.dev.datopian.com/api/3/action/datastore_search_sql |
Query examples
"https://ckan.cdt.dev.datopian.com/api/3/action/datastore_search?resource_id=3b0cea45-09e0-4517-9d50-684ae2dc1606&limit=5""https://ckan.cdt.dev.datopian.com/api/3/action/datastore_search?resource_id=3b0cea45-09e0-4517-9d50-684ae2dc1606&q=jones""https://ckan.cdt.dev.datopian.com/api/3/action/datastore_search_sql?sql=SELECT%20%2A%20FROM%20%223b0cea45-09e0-4517-9d50-684ae2dc1606%22%20LIMIT%205"SQL queries depend on whether SQL search is enabled by the portal.
OData query
Use the resource's OData URL and its field names for paging, selecting columns, or filtering rows.
ODATA_RESOURCE_URL?$top=5
ODATA_RESOURCE_URL?$skip=5&$top=5
ODATA_RESOURCE_URL?$select=FIELD_NAME&$filter=FIELD_NAME eq 'VALUE'Replace ODATA_RESOURCE_URL, FIELD_NAME, and VALUE with the details for the selected resource. See the OData query options guide (opens in a new tab) for more examples.
Use the API in code
JavaScript (JSONP)
var data = { resource_id: '3b0cea45-09e0-4517-9d50-684ae2dc1606', limit: 5, q: 'jones' };
$.ajax({
url: 'https://ckan.cdt.dev.datopian.com/api/3/action/datastore_search',
data: data,
dataType: 'jsonp',
success: function (response) {
console.log(response.result.total, response.result.records);
}
});Python
import json
from urllib.request import urlopen
url = 'https://ckan.cdt.dev.datopian.com/api/3/action/datastore_search?resource_id=3b0cea45-09e0-4517-9d50-684ae2dc1606&limit=5'
with urlopen(url) as response:
result = json.load(response)['result']
print(result['total'], result['records'])For parameters and response fields, see the CKAN DataStore documentation (opens in a new tab).