PROBA-V 1Km, 333m, and 100m products (Level 1C & 3)

PROBA-V Vegetation
PROBA-V processing chain (image credits: VITO).
  • 1km and 300m products: data available from Oct 2013 onward 
  • 100m products: data is available from March 2014 onward, the geometric accuracy for the data before March 2014 was sub-optimal and not adequate for 100m resolution due to an issue with the star tracker on-board SW (the issue was solved on March 2014 with the update of the on-board SW).

A full reprocessing of the PROBA-V archive was launched during the summer of 2016 to further improve the PROBA-V datasets. The Collection 1 (C1) dataset includes significant quality improvements with respect to the previous data version Collection 0 (C0):

  • Updated Cloud detection
  • Re-fined radiometric calibration parameters
  • Release of the intermediate L2a products
  • Meta data compliancy to Climate and Forecasting conventions (v1.6)

The new C1 dataset is identified by the version number "V101", replacing the old "V001" used previously. Online access to the current collection (C0) will be discontinued by the end of February 2017.

Algorithm Theoretical Baseline Document (ATBD)

The PROBA-V ATBD for the geometric and radiometric processing are available here:

The values of the different radiometric and geometric parameters are stored in the Instrument Calibration Parameters (ICP) files. The latest information on Radiometric and Geometric Quality is given in the Quarterly Image quality reports.

Reference Scientific paper

The following scientific paper provides relevant information about PROBA-V products content and quality:

W. Dierckx, et al. "PROBA-V mission for global vegetation monitoring: standard products and image quality", IJRS, 2014 

 

Products Content Overview

PROBA-V products are available to the users as:

  • Segment products (Level 1c): similar to SPOT-VGT P-products, they consist of raw data, which is geo-located and radiometrically calibrated to TOA (Top Of Atmosphere) reflectance values. 
  • TOA products (Level 2a): Top Of Atmosphere reflectance in the 4 bands: Blue, Red, NIR and SWIR radiometrically and geometrically corrected, projected to a Plate Carrée grid, provided as full segments (not tiled) and resampled to the chosen spatial resolution .
  • Synthesis products (Level 3): 1 and 10 days synthesis for 1 km and 300m, 1 and 5 days synthesis for the 100m products, they are similar to SPOT-VGT S-products and consist on L1c data, which have been further processed with the following processing steps:
    • Mapping into lat/lon WGS84 projection
    • Mosaicking for the SWIR band
    • Detection of clouds, clouds shadows and snow/ice
    • Compositing procedure (using a Max NDVI method with constraints on SZA for 1km and SZA+VZA for 300m and 100m)
    • Atmospheric Correction (using SMAC method) for TOC (Top Of Canopy) products

Access to PROBA-V products is available through the Product Distribution Portal.

The PROBA-V Vegetation Raw products (L1C/P) and synthesis products (S1 = daily, S5 = 5 days, S10 = decade) ensure coverage of all significant landmasses worldwide with, in the case of a 10-day synthesis product, a minimum effect of cloud cover, resulting from selection of cloud-free acquisitions during the 10-day period. It ensures a daily coverage between Lat. 35°N and 75°N, and between 35°S and 56°S, and a full coverage every two days at the equator.

The Vegetation instrument is pre-programmed with an indefinite repeated sequence of acquisitions. This nominal acquisition scenario allows a continuous series of identical products to be generated, aiming to map land cover and vegetation growth across the entire planet every two days.

The PROBA-V Vegetation synthesis products are divided into so- called granules, each measuring 10 degrees x 10 degrees, each granule being delivered as a single file.

PROBA-V Products generation/processing level:

 

Processing
level

Products Content Description

Delivered
products

Raw

Communication frames, as delivered by the Data Reception Station (DRS)

 

Level 0

- Instrument Source packets, sorted by time, duplicated packets removed, wrong packets taken out, etc
- Housekeeping packets, i.e. temperatures, pressures, orbit, attitude, time correlation; sorted by time, duplicated packets removed, wrong packets taken out, etc

 

Level 1A

Instrument data annotated with instrument and platform housekeeping as well as ancillary (position, velocity, pointing) information. All meta data needed for the following processing step towards Level 1B included. Instrument data is unprocessed, at full resolution, time-referenced.

 

Level 1B

L1A plus associated geometry derived information at pixel level

 

Level 1C

L1B that is radiometrically corrected at pixel level: unprojected Top Of Atmosphere (TOA) reflectance

L1c

Level 2A

L1C that is mapped and projected onto a uniform space grid, corrected for cloud, ice/snow and show artifacts (projected TOA reflectance)

L2a

Level 2B

Atmospherically corrected L2A data. Top Of Canopy (TOC) reflectance, projected and mapped on a uniform space grid scale.

 

Level 3

TOA and TOC reflectances composited over defined time frame: 1 day, 10 days, 5 days (only for 100m). 

S1, S10, S5

 

The PROBA-V Data Products are:

 

Processing level Synthesis Resolution Reflectance
Level 1C -
Level 3 S1 100m TOA
TOC
TOC NDVI
333m TOA
TOC
1Km TOA
TOC
S5 100m TOA
TOC
TOC NDVI
S10 333m TOC
TOC NDVI
1Km TOC
TOC NDVI

 

Product specifications
Projection Plate carrée
Spectral bands All 4 + NDVI
Format HDF5 & GeoTiFF

 

  • PROBA-V L1C: Radiometrically corrected Level 1B data (i.e. unprojected TOA reflectance), given per strip/camera. Pixel digital numbers are converted to radiance values. Image remains in raw sensor geometry (unprojected).
  • PROBA-V S1 TOA (at 1km and 333m): PROBA-V Level3 Top Of Atmosphere (no atmospheric corrections applied) daily synthesis product at 1KM spatial resolution containing:
    • (1) Top Of Atmosphere reflectance in the four spectral bands corresponding to the selected measurement, without atmospheric correction being performed
    • (2) Normalized Difference Vegetation Index (NDVI). This should be considered as a first example of a widely accepted surface parameter, and capabilities to include other quantities derived from surface reflectance should be preserved in the system
    • (3) Geometric viewing conditions
    • (4) Reference to date and time of selected measurement
    • (5) Information on the composite status map (containing identification of snow, ice, shadow, clouds, land/sea for every pixel)

The datasets are resampled to a fixed grid in the Plate Carrée (equidistant) projection at 1KM spatial resolution.

  • PROBA-V S1 TOC (at 1km and 333m): PROBA-V Level3 Top Of Canopy (atmospheric corrections applied) daily synthesis product at 1KM spatial resolution containing:
    • (1) Top Of Canopy (ground surface) reflectance in the four spectral bands corresponding to the selected measurement, the atmospheric correction being performed using the SMAC procedure
    • (2) Normalized Difference Vegetation Index (NDVI). This should be considered as a first example of a widely accepted surface parameter, and capabilities to include other quantities derived from surface reflectance should be preserved in the system
    • (3) Geometric viewing conditions
    • (4) Reference to date and time of selected measurement
    • (5) Information on the composite status map (containing identification of snow, ice, shadow, clouds, land/sea for every pixel)

The datasets are resampled to a fixed grid in the Plate Carrée (equidistant) projection at 1KM spatial resolution.

  • PROBA-V S10 TOC (at 1km and 333m): Decadal synthesis of S1's as Maximum Value Compositing (MVC). PROBA-V Level3 Top Of Canopy (atmospheric corrections applied) ten-daily synthesis product at 1KM spatial resolution containing:
    • (1) Top Of Canopy (ground surface) reflectance in the four spectral bands corresponding to the selected measurement, the atmospheric correction being performed using the SMAC procedure
    • (2) Normalized Difference Vegetation Index (NDVI). This should be considered as a first example of a widely accepted surface parameter, and capabilities to include other quantities derived from surface reflectance should be preserved in the system
    • (3) Geometric viewing conditions
    • (4)Reference to date and time of selected measurement
    • (5) Information on the composite status map (containing identification of snow, ice, shadow, clouds, land/sea for every pixel)