Emergence Delay¶
📖 Overview¶
This analytic compares the current season emergence to the average historical emergence at the field level. The result is the number of days of difference.
Baseline data¶
- NDVI MR/LR Time Series
API¶
Input Parameters¶
| Parameter | Variable Name | Description | Type |
|---|---|---|---|
| id | id(optional) |
Earthdaily Agro internal ID of the area of interest | string |
| geometry | geometry |
Geometry of the area of interest (WKT format) | string |
| crop | crop (optional) |
Crop code of the area of interest (must match available crop list) | string |
| seasonDuration | seasonDuration |
Duration of the season, in days | integer |
| seasonStartDay | seasonStartDay |
Start day of the season (1–31) | integer |
| seasonStartMonth | seasonStartMonth |
Start month of the season (1–12) | integer |
| year | year (optional) |
Year of the first date of the season (used to retrieve past 5 years of data) | integer |
| dataSource | dataSource (optional) |
Data resolution: LR (Low Resolution) or MR (Medium Resolution); default is LR | string |
Output Variables¶
| Parameter | Variable Name | Description | Type |
|---|---|---|---|
| Emergence Date | EmergenceDate |
Detected emergence date (can be null if not detected) | datetime |
| Average Emergence Date | AverageEmergenceDate |
Average emergence date of the past five seasons | datetime |
| Emergence Delay | EmergenceDelay |
Days differences between the current emergence date and the average emergence date | string |
📊 Performance and Accuracy¶
-
Tested Crops:
- Soybeans
- Corn
- Wheat
- Malting Barley
-
Tested Regions:
- Brazil
- United States
- Ireland
- Russia
- France
-
Average Generation Time: < 1 second per field
💼 Use Case and Product Integration¶
This analytic is used in: - Portfolio -
📚 Glossary¶
| Term | Description |
|---|---|
| NDVI (Normalized Difference Vegetation Index) | A vegetation index derived from visible and near-infrared reflectance. Values range from -1 to 1, with higher values indicating healthier vegetation. |
| MR / LR | Image resolutions used in analysis: MR (Medium Resolution) and LR (Low Resolution). |
| Season Duration | Total number of days in the crop season, used to calculate cumulative NDVI. |
| Season Start Day / Month | Day and month marking the beginning of the crop season, used to define the NDVI accumulation period. |
| WKT (Well-Known Text) | A standard text format for representing spatial geometries such as points, lines, and polygons. |
| AOI (Area of Interest) | A user-defined geographic area selected for analysis. |