Historical NDVI by polygon
Daily updating of NDVI for prompt monitoring of vegetation.
Description:
Detailed historical data for analysis and comparison vegetation of one season to another.
Archive since the 2001 year (only for the Corporate account).
NDVI is calculated based on a combination of imageries from Landsat, Sentinel and MODIS with daily updating.
NDVI (Normalized Difference Vegetation Index), EVI (Enhanced Vegetation Index) are the most common indicators for assessing vegetation progress over time.
API call:
http://api.agromonitoring.com/agro/1.0/ndvi/history?start={start date}&end={end date}&polyid={ID of polygon}&appid={API key}
Parameters of API call:
Necessary parameters
appid
Personal API key
polygon_id
ID of a polygon
start
Start date (unix time, UTC), e.g. start=1483218000n
end
End date (unix time, UTC), e.g. end=1504213200
Optional parameters
type
Name of datasourse Landsat-8 (l8), Sentinel-2 (s2)
zoom
Number of zoom level
coverage_max
%
coverage_min
%
clouds_max
%
clouds_min
%
Examples of API calls:
Example of API response:
{ { "dt": 1534723200, "source": "l8", "zoom": 13, "dc": 100, "cl": 0.16, "data": { "std": 0.1558458159825856, "p75": 0.7262991514983845, "min": 0.17311303041682313, "max": 0.8387096774193549, "median": 0.60759000472567, "p25": 0.474027202361513, "num": 8374, "mean": 0.5979920916568334 }, .... }
Parameters of API response:
dt
Acquisition date (unix time, UTC)source
Satellite name (Landsat 8, Sentinel 2)zoom
Number of zoom leveldc
Approximate useful area (What percentage of the polygon is filled with the available satellite images)cl
Approximate percentage of cloudsdata
Data for the current polygonstd
The standard deviation of the indexp25
The first quartile value of the indexnum
The number of pixels in the current polygonmin
The minimum value of the indexmax
The maximum value of the indexmedian
The median value of the indexp75
The third quartile value of the indexmean
The average value of the index