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Temporal Evolution in Spectral Indexes

After conexion, this service provides the enduser with statistics calculated on demand, characterising the evolution of spectral temporal composites for a chosen index in a chosen date-to-date time period.

The statistics are calculated in uploaded or on-screen plotted polygons or transects.

The enduser can:

  • Upload his/her own area(s) of interest into the platform: polygon(s) or transect(s)
  • Plot his/her own area(s) of interest on screen: polygon(s) or transect(s)
  • Set a date-to-date calculation period
  • Set the temporal composite (periodicity) spectral index of his/her choice as input

Statistics in Polygons

Instructions

  • Upload or plot one or more polygons on screen
  • Select one or more of the uploaded or plotted polygons
  • Activate the "Statistics" function
  • Select a spectral index
  • Select the statistic to be calculated: mean, standard deviation, minimum, 1st quartile, median, 3rd quartile and maximum
  • Select the periodicity of the temporal composite: monthly, quarterly, half-yearly, annual
  • Set the start date (month and year): the statistics will be calculated between the chosen date and the most recent available temporal composite
  • Run computation

As a result, this MangMap service offers:

  1. A table of values for each polygon
  2. An on-screen graph showing the variation of values over time
  3. The option of selecting a curve and reading along the curve: statistical value of the polygon (ordinate) over time (abcissa)
  4. Download the table of calculated statistical values in .csv format and the graph displayed in PNG, JPEG and PDF formats

Illustration :

Evol_NDVI_polygone_Monthly_2018_EN
Screenshot of the evolution of monthly NDVI synthesis, from January 2018 to April 2023 (user polygon)

Statistics along Transects

Instructions

  • Import or plot on screen one or more transect(s)
  • Select one or more transects
  • Select a spectral index
  • Select the statistic to be calculated: mean, standard deviation, minimum, 1st quartile, median, 3rd quartile and maximum
  • Select the periodicity of the temporal composite: monthly, quarterly, half-yearly, annual
  • Set the start date (month and year): the statistics will be calculated between the chosen date and the most recent available temporal composite
  • Run computation

As a result, this MangMap service offers:

  1. A table of values for each transect
  2. An on-screen graph showing the variation of values in space along the transect
  3. The option of selecting a curve and reading along the curve: distance from transect start point (abcissa) over statistical pixel value (ordinate)
  4. Download the table of calculated statistical values in .csv format and the graph displayed in PNG, JPEG and PDF formats

Illustration :

Evol_NDVI_transect_Monthly_01_2022_EN
Screenshot of the evolution of monthly NDVI synthesis, January 2022 to July 2023 (user transect) - 3 dates displayed