History NDVI


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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 request:
Necessary parameters:
  • appid

Personal API key

  • polygon_id

ID of a polygon

  • start

Start date of the data search (unix time, UTC), e.g. start=1483218000

  • end

End date of the data search (unix time, UTC), e.g. end=1504213200

Optional parameters:
  • type

Name of data source Landsat-8 (l8), Sentinel-2 (s2)

  • zoom

Number of zoom level

  • coverage_max

%

  • coverage_min

%

  • clouds_max

%

  • clouds_min

%

Example of API Calls:

https://samples.agromonitoring.com/agro/1.0/ndvi/history?polyid=5aaa8052cbbbb5000b73ff66&start=1530336000&end=1534976000&appid=b1b15e88fa797225412429c1c50c122a1

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 response:
  • dt

Acquisition date (Unix time, UTC)

  • source

Satellite name (Landsat 8, Sentinel 2)

  • zoom

Number of zoom level

  • dc

Approximate useful area (what percentage of the polygon is filled with the available satellite images)

  • cl

Approximate percentage of clouds

  • data

Data for the current polygon

  • num — The number of pixels in the current polygon
  • min — The minimum value of the index
  • max — The maximum value of the index
  • median — The median value of the index
  • mean — The average value of the index

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