Get satellite data for polygon


The "Satellite imagery" functionality allows you to monitor the level of vegetation or crop health of your fields.
You can get the following data for the selected polygon:

Satellite imagery for polygon

  1. Go to the "Satellite imagery" section.

    • In this section, on the right side of the screen, you can see a vertical menu with a list of your polygons as on the pic below.
      If you want to know how to create a polygon, read here.

    • On the map you get the most recent satellite imagery for one of your polygons.

  2. Click on the selected polygon.

    • On the "Imagery" tab you get all available satellite imagery for your polygon. See on the pic below.

    • On the map you get the most recentlast satellite imagery for your polygon.

  3. Click on some satellite imagery.

    • Selected satellite imagery will be displayed on the map.

    • The value of statistical by NDVI and EVI indices for this satellite imagery will be displayed under the map in the statistics block.


Legend

  1. For each polygon in the right menu displays the following information:

    • Name

    • Square (ha)

    • Preview

  2. For each satellite imagery in the right menu displays the following information:

    • Create date

    • Source (Landsat-8, Sentinel-2)

    • Cloudless

    • Resolution (m/px)

NVDI and EVI statistics for satellite imagery

  1. Go to the "Satellite imagery" section.

    • In this section, on the right side of the screen, there is a menu with a list of all your polygons.
      If you want to know how to create a polygon, read here.

  2. Click on the selected polygon.

    • On the "Imagery" tab you find all available satellite imagery for your polygon.

  3. Click on the any of satellite imagery.

    • The statistics of NDVI and EVI indices for this image are displayed under the map in the statistics block as on the pic below.


Legend

    For each satellite imagery the statistics provides the following parameters:

    • Max - the maximum value of the index (the third quartile value of the index)

    • Mean - the average value of the index

    • Min - the minimum value of the index (the first quartile value of the index)

    • Deviation - the standard deviation of the index

    • Num - the number of pixels for which the index is caluclated

NDVI history chart

  1. Go to the "Satellite imagery" section.

    • In this section, on the right side of the screen, there is a vertical menu with a list of your polygons.
      If you want to know how to create a polygon, read here.

  2. Click on the selected polygon.

    • The historical NDVI chart for the selected polygon is shown under the map as on the pic below.

    • The chart displays the three curves:

      • Max - the maximum value for the index (the third quartile value of the index)

      • Mean - the average value of the index

      • Min - the minimum value of the index (the first quartile value of the index)

  3. To select or remove curves from the chart just click on their names on the right side of the chart.

  4. By default, the chart is built for the current season. To select other dates for display a historical NDVI chart, use the calendar underneath.


Legend

  1. The Y-axis is the numerical value of NDVI.

  2. The X-axis shows dates for which NDVI data is caluclated.

    • These dates match the available satellite images on the right menu in the Imagery tab. If you click on any image from the list of satellite imagery, you get detailed statistics and see the image on the map.







Read more in our Blog. If you have any questions or comments, please contact us at info@openweathermap.org!