Data Products

This chapter describes the VanderSat data products. This a technical description. Background documentation including scientific papers describing the algorithm can be obtained on request. Information can also be found on the FAQs and Background pages.

Product data flags

Most VanderSat products have an associated file with a quality indicator or data flag. These are stored as separate products in our system. See How to retrieve the data flags? and Flags data file description for LST, VOD, and SM for information on how to retrieve and interpret the flags.

Product naming convention

VanderSat data products follow a simple three-part naming convention: {product-name}_{version-string}_{pixel-size}.

product-name

The name of the product. This name itself usually consists of several parts separated by hyphens (-). The first part is the actual product (eg.e SM, TEFF etc), the other (usually three) parts give the product attributes, e.g.: SM-{SAT}-{BAND}-{TIME}. Here {SAT} will be replaced by the satellite/instrument {BAND} will be replaced by the frequency band the product has been derived from, {TIME} will be replaced by the part of the orbit (ASC or DESC). For example SM-SMAP-LN-DESC specifies soil moisture for the SMAP satellite using L band without vegetation correction (see Vegetation correction) derived from the descending orbit and QF-AMSR2-SM-C1V-DESC specifies the quality flags for soil moisture derived from the AMSR2 instrument descending C band with vegetation correction.

version-string

The version string is made up of 4 positions. It always starts with a V and the remaining three positions denote a integer number padded with zeros (e.g. V001 or V034 are describing version 1 and version 34, respectively). Minor version information can be found in the meta data of the actual data products.

pixel-size

Pixel size is given as a number in meters. This is an approximate size as the data itself is stored in decimal degrees (WGS84). The actual size in decimal degrees is given in the description of each data product.

Vegetation correction

In certain cases a vegetation correction is applied to the soil moisture (SM) and vegetation optical depth (VOD) products. This is denoted in the product name such that SM-C1N is the normal product and SM-C1V is the vegetation corrected version of the product. In the majority of cases, the normal product will be used. If the vegetation corrected product is required, we will let you know.

Volumetric soil moisture L band (SM)

Description

Satellite observed volumetric soil moisture derived from L band microwave data in combination with other bands. It is based on VanderSat’s patented high resolution technology and provides soil moisture of the top 5 cm of the soil, depending on moisture conditions. VanderSat’s L band data is retrieved from the SMAP satellite.

Volumetric_Soil_Moisture L band

Key Specification

Name

Soil Moisture (L band)

API name

SM-SMAP-LN-DESC_V003_100

Abbreviation

SM-SMAP-LN-DESC_V003_100

Versions

Version 0.9: Noordwijk, Version 1.0: Haarlem, Version 3.0: Champaign

Unit

\(m^3/m^3\)

Sensing depth

5 cm

Pixel size

100x100m, 0.000888888888889 degree

Temporal resolution

230 observations per year at 52 degree latitude

Local overpass time

6:00 AM

Coverage

Global

Data availability

April 2015 - Present

Satellites used

AMSR-2, SMAP

Available to user

12 hours after overpass of the satellites

File format

GeoTIFF, NetCDF (images), CSV (time series)

Data delivery

VanderSat API, VanderSat Viewer

Image properties

GeoTIFF properties:

Parameter

Value

Data type

uint16

Compression

LZW

Scale

0.001

Offset

0

Band 1

Soil moisture

Band 2

Data marked as unreliable

NoData

65535

NetCDF properties:

Parameter

Value

Data type

uint16

Compression

Zip 6

Scale

0.001

Offset

0

Band 1

Soil moisture

Band 2

Data marked as unreliable

NoData

65535

Data for areas with critical flags is automatically removed from the first band but may be retrieved from the second band. A full description of the data flags is given in Data Flags.

Terms of use

Data is property of VanderSat B.V and may only be used for the purpose specified in the service/data contract.

Contains modified Copernicus Sentinel data.

Volumetric Soil Moisture C band (SM)

Description

Satellite observed volumetric soil moisture derived from C band microwave data in combination with other bands. It is based on VanderSat’s patented high resolution technology and provides soil moisture of the top 2 cm of the soil, depending on moisture conditions. VanderSat’s C band soil moisture is derived from the Advanced Microwave Scanning Radiometer 2 (AMSR2) on board the GCOM-W1 satellite as well as the Advanced Microwave Scanning Radiometer - EOS (AMSRE) on board the AQUA satellite.

Volumetric_Soil_Moisture C band

Key Specification

Name

Soil Moisture (C band)

API name

SM-AMSR2-C1N-DESC_V003_100, SM-AMSRE-C1N-DESC_V003_100

Abbreviation

SM-AMSR2-C1N-DESC_V003_100, SM-AMSRE-C1N-DESC_V003_100

Versions

Version 0.9: Noordwijk, Version 1.0: Haarlem, Version 3.0: Champaign

Unit

\(m^3/m^3\)

Sensing depth

2 cm

Pixel size

100x100m, 0.000888888888889 degree

Temporal resolution

320 observations per year at 52 degree latitude

Local overpass time

01:30 LST (DESC) – 13:30 LST (ASC) +/- 40 minutes (variable timing for GMI, separated into day and night)

Coverage

Global

Data availability

April 2002 - Present; gap in 2012

Satellites used

AMSR-E, AMSR-2, TMI (on request), GPM-GMI (used as backup only)

Available to user

12 hours after overpass of the satellites

File format

GeoTIFF, NetCDF (images), CSV (time series)

Data delivery

VanderSat API, VanderSat Viewer

Image properties

GeoTIFF properties:

Parameter

Value

Data type

uint16

Compression

LZW

Scale

0.001

Offset

0

Band 1

Soil moisture

Band 2

Data marked as unreliable

NoData

65535

NetCDF properties:

Parameter

Value

Data type

uint16

Compression

Zip 6

Scale

0.001

Offset

0

Band 1

Soil moisture

Band 2

Data marked as unreliable

NoData

65535

Data for areas with critical flags is automatically removed from the first band but may be retrieved from the second band. A full description of the data flags is given in Data Flags.

Terms of use

Data is property of VanderSat B.V and may only be used for the purpose specified in the service/data contract.

Contains modified Copernicus Sentinel data.

Volumetric Soil Moisture X band (SM)

Description

Satellite observed volumetric soil moisture derived from X band microwave data in combination with other bands. It is based on VanderSat’s patented high resolution technology and provides soil moisture of the top 1 cm of the soil, depending on moisture conditions. VanderSat’s X band soil moisture is derived from the Advanced Microwave Scanning Radiometer 2 (AMSR2) on board the GCOM-W1 satellite, the Advanced Microwave Scanning Radiometer - EOS (AMSRE) on board the AQUA satellite, and the GMI sensor on board the Global Precipitation Measurement (GPM) satellite.

Volumetric_Soil_Moisture X band

Key Specification

Name

Soil Moisture (X band)

API name

SM-AMSR2-XN-DESC_V003_100, SM-AMSRE-XN-DESC_V003_100

Abbreviation

SM-AMSR2-XN-DESC_V003_100, SM-AMSRE-XN-DESC_V003_100

Versions

Version 0.9: Noordwijk, Version 1.0: Haarlem, Version 3.0: Champaign

Unit

\(m^3/m^3\)

Sensing depth

1 cm

Pixel size

100x100m, 0.000888888888889 degree

Temporal resolution

320 observations per year at 52 degree latitude

Local overpass time

01:30 (DESC) – 13:30 (ASC) (variable timing for GMI, separated into day and night)

Coverage

Global

Data availability

April 2002 - Present; gap in 2012

Satellites used

AMSR-E, AMSR-2, TMI (on request), GPM-GMI (used as backup only)

Available to user

12 hours after overpass of the satellites

File format

GeoTIFF, NetCDF (images), CSV (time series)

Data delivery

VanderSat API, VanderSat Viewer

Image properties

GeoTIFF properties:

Parameter

Value

Data type

uint16

Compression

LZW

Scale

0.001

Offset

0

Band 1

Soil moisture

Band 2

Data marked as unreliable

NoData

65535

NetCDF properties:

Parameter

Value

Data type

uint16

Compression

Zip 6

Scale

0.001

Offset

0

Band 1

Soil moisture

Band 2

Data marked as unreliable

NoData

65535

Data for areas with critical flags is automatically removed from the first band but may be retrieved from the second band. A full description of the data flags is given in Data Flags.

Terms of use

Data is property of VanderSat B.V and may only be used for the purpose specified in the service/data contract.

Contains modified Copernicus Sentinel data.

Derived Root Zone Soil Moisture (DRZSM)

Derived Root Zone Soil Moisture is calculated from one of the direct soil moisture products (Volumetric soil moisture L band (SM), Volumetric Soil Moisture C band (SM), Volumetric Soil Moisture X band (SM)) using the method described by Albergel et al., 2008. (https://doi.org/10.5194/hess-12-1323-2008) and Paulik et. al. 2014, https://www.sciencedirect.com/science/article/pii/S0303243414000099). The characteristic time T is part of the product name. In case of single point time series retrieved via the API, it can be calculated on the fly (see Requesting point time series with point-time-series). For gridded data, the maps are pre-calculated using a number of pre-defined T values. DRZSM is also calculated for periods with missing input data. If data is missing, this will be reflected in the quality flag that is stored in a separate file (see DRZSM quality indicator).

Derived Root Zone Soil Moisture

Key Specification

Name

Derived Root Zone Soil Moisture

API name

DRZSM-AMSR2-C1N-DESC-T10_V003_100

Abbreviation

DRZSM-AMSR2-C1N-DESC-T10_V003_100

Versions

Version 0.9: Noordwijk, Version 1.0: Haarlem, Version 3.0: Champaign

Unit

\(m^3/m^3\)

T value

10, 20

Pixel size

100x100m, 0.000888888888889 degree

Temporal resolution

365 images/yr

Coverage

Global

Data availability

April 2002 - Present; gap in 2012

Satellites used

AMSR-E, AMSR-2, SMAP

Available to user

12 hours after overpass of the satellites

File format

GeoTIFF, NetCDF (images), CSV (time series)

Data delivery

VanderSat API, VanderSat Viewer

The name of the DRZSM also includes the top soil soil moisture from which it is derived and the T value used in the creation of the DRZSM. For example, DRZSM-AMSR2-C1N-DESC-T10_V003_100 contains root zone soil moisture derived from C band data using a T value of 10 and DRZSM-SMAP-LN-DESC-T20_V003_100 contains root zone soil moisture derived from L band data using a T value of 20.

Image properties

GeoTIFF properties:

Parameter

Value

Data type

uint16

Compression

LZW

Scale

0.001

Offset

0

Band 1

Derived Root Zone Soil Moisture

NoData

65535

NetCDF properties:

Parameter

Value

Data type

uint16

Compression

Zip 6

Scale

0.001

Offset

0

Band 1

Derived Root Zone Soil Moisture

NoData

65535

Terms of use

Data is property of VanderSat B.V and may only be used for the purpose specified in the service/data contract.

Contains modified Copernicus Sentinel data.

Land Surface Temperature (LST, TEFF)

Satellite observed land surface temperature (effective temperature) using multi-frequency microwave sensor technology and VanderSat’s patented methodology.

Land Surface Temperature

Key Specification

Name

Land Surface Temperature

API name

TEFF-AMSR2-DESC_V003_100, TEFF-AMSRE-DESC_V003_100

Abbreviation

TEFF-AMSR2-DESC_V003_100, TEFF-AMSRE-DESC_V003_100

Versions

Version 0.9: Noordwijk, Version 1.0: Haarlem, Version 3.0: Champaign

Unit

K

Sensing depth

surface

Pixel size

100x100m, 0.000888888888889 degree

Temporal resolution

320 observations per year at 52 degree latitude

Local overpass time

01:30 (DESC) – 13:30 (ASC)

Coverage

Global

Data availability

April 2002 - Present; gap in 2012

Number of critical flags

5

Satellites used

AMSR-E, AMSR-2

Available to user

12 hours after overpass of the satellites

File format

GeoTIFF, NetCDF (images), CSV (time series)

Data delivery

VanderSat API, VanderSat Viewer

Image properties

GeoTIFF properties:

Parameter

Value

Data type

uint16

Compression

LZW

Scale

0.01

Offset

0

Band 1

LST

Band 2

Data marked as unreliable

NoData

65535

NetCDF properties:

Parameter

Value

Data type

uint16

Compression

Zip 6

Scale

0.01

Offset

0

Band 1

LST

Band 2

Data marked as unreliable

NoData

65535

Terms of use

Data is property of VanderSat B.V and may only be used for the purpose specified in the service/data contract.

Contains modified Copernicus Sentinel data.

Vegetation Optical Depth L band (VOD)

Satellite observed vegetation optical depth (VOD) using multi-frequency microwave sensor technology and VanderSat’s patented methodology.

Vegetation Optical Depth

Key Specification

Name

Vegetation Optical Depth (L band)

API name

VOD-SMAP-LN-DESC_V003_100

Abbreviation

VOD-SMAP-LN-DESC_V003_100

Versions

Version 0.9: Noordwijk, Version 1.0: Haarlem, Version 3.0: Champaign

Unit

Sensing depth

Pixel size

100x100m, 0.000888888888889 degree

Temporal resolution

320 observations per year at 52 degree latitude

Local overpass time

06:00 (DESC) – 18:00 (ASC)

Coverage

Global

Data availability

April 2002 - Present; gap in 2012

Number of critical flags

5

Satellites used

AMSR-2, SMAP

Available to user

12 hours after overpass of the satellites

File format

GeoTIFF, NetCDF (images), CSV (time series)

Data delivery

VanderSat API, VanderSat Viewer

Image properties

GeoTIFF properties:

Parameter

Value

Data type

uint16

Compression

LZW

Scale

0.001

Offset

0

Band 1

VOD

Band 2

Data marked as unreliable

NoData

65535

NetCDF properties:

Parameter

Value

Data type

uint16

Compression

Zip 6

Scale

0.001

Offset

0

Band 1

VOD

Band 2

Data marked as unreliable

NoData

65535

Terms of use

Data is property of VanderSat B.V and may only be used for the purpose specified in the service/data contract.

Contains modified Copernicus Sentinel data.

Vegetation Optical Depth C band (VOD)

Satellite observed vegetation optical depth (VOD) using multi-frequency microwave sensor technology and VanderSat’s patented methodology.

Vegetation Optical Depth

Key Specification

Name

Vegetation Optical Depth (C band)

API name

VOD-AMSR2-C1N-DESC_V003_100, VOD-AMSRE-C1N-DESC_V003_100

Abbreviation

VOD-AMSR2-C1N-DESC_V003_100, VOD-AMSRE-C1N-DESC_V003_100

Versions

Version 0.9: Noordwijk, Version 1.0: Haarlem, Version 3.0: Champaign

Unit

Sensing depth

Pixel size

100x100m, 0.000888888888889 degree

Temporal resolution

320 observations per year at 52 degree latitude

Local overpass time

01:30 (DESC) – 13:30 (ASC)

Coverage

Global

Data availability

April 2002 - Present; gap in 2012

Satellites used

AMSR-E, AMSR-2

Available to user

12 hours after overpass of the satellites

File format

GeoTIFF, NetCDF (images), CSV (time series)

Data delivery

VanderSat API, VanderSat Viewer

Image properties

GeoTIFF properties:

Parameter

Value

Data type

uint16

Compression

LZW

Scale

0.001

Offset

0

Band 1

VOD

Band 2

Data marked as unreliable

NoData

65535

NetCDF properties:

Parameter

Value

Data type

uint16

Compression

Zip 6

Scale

0.001

Offset

0

Band 1

VOD

Band 2

Data marked as unreliable

NoData

65535

Terms of use

Data is property of VanderSat B.V and may only be used for the purpose specified in the service/data contract.

Contains modified Copernicus Sentinel data.

Vegetation Optical Depth X band (VOD)

Satellite observed vegetation optical depth (VOD) using multi-frequency microwave sensor technology and VanderSat’s patented methodology.

Vegetation Optical Depth

Key Specification

Name

Vegetation Optical Depth (X band)

API name

VOD-AMSR2-XN-DESC_V003_100, VOD-AMSRE-XN-DESC_V003_100

Abbreviation

VOD-AMSR2-XN-DESC_V003_100, VOD-AMSRE-XN-DESC_V003_100

Versions

Version 0.9: Noordwijk, Version 1.0: Haarlem, Version 3.0: Champaign

Unit

Sensing depth

Pixel size

100x100m, 0.000888888888889 degree

Temporal resolution

320 observations per year at 52 degree latitude

Local overpass time

01:30 (DESC) – 13:30 (ASC)

Coverage

Global

Data availability

April 2002 - Present; gap in 2012

Satellites used

AMSR-E, AMSR-2

Available to user

12 hours after overpass of the satellites

File format

GeoTIFF, NetCDF (images), CSV (time series)

Data delivery

VanderSat API, VanderSat Viewer

Image properties

GeoTIFF properties:

Parameter

Value

Data type

uint16

Compression

LZW

Scale

0.001

Offset

0

Band 1

VOD

Band 2

Data marked as unreliable

NoData

65535

NetCDF properties:

Parameter

Value

Data type

uint16

Compression

Zip 6

Scale

0.001

Offset

0

Band 1

VOD

Band 2

Data marked as unreliable

NoData

65535

Terms of use

Data is property of VanderSat B.V and may only be used for the purpose specified in the service/data contract.

Contains modified Copernicus Sentinel data.

Inundation classes (INU-CLASSES)

Inundation derived from Sentinel-1 data. Based on open water detection in combination with change detection and thresholding.

INU-CLASSES

Classified files using classes 0-6 based on the following input maps as a first step:

W

Water detected using histogram method (0, 1)

V

Change detection in VV (0,1,2)

VH

Change detection in VH (0,1,2)

In the second step these maps are combined into one final maps using the following lookup table:

0

VV = 0, VH = 0 W = 0 - no color

1

W = 0, VV >=1, VH >= 0 - white

2

W = 1, VV = 1, VH = 0 - blue

3

W = 1, VV = 2, VH = 0 - blue

4

W = 1, VV = 1, VH >= 1 - blue

5

W = 1, VV = 2, VH = 1 - blue

6

W = 1, VV = 2, VH = 2 - dark blue

Inundation Classes

Key Specification

Name

Inundation

API name

INU-S1-CLASSES_V001_10

Abbreviation

INU-S1-CLASSES_V001_10

Versions

Version 0.9: Noordwijk, Version 3.0: Champaign

Unit

Classes (7) or RGB

Pixel size

10x10m, 8.9831528412e-05 degree

Temporal resolution

3-6 days (location dependent)

Coverage

Global

Data availability

October 2014 - Present

Satellites used

Sentinel-1a/b

Available to user

12 hours after overpass of the satellites

File format

GeoTIFF, NetCDF (images), CSV (time series)

Data delivery

VanderSat API, VanderSat Viewer

Image properties

GeoTIFF properties:

Parameter

Value

Data type

Byte

Compression

LZW

Scale

1

Offset

0

Band 1

Inundation classes

NoData

255

NetCDF properties:

Parameter

Value

Data type

Byte

Compression

Zip 6

Scale

1

Offset

0

Band 1

Inundation classes

NoData

255

Terms of use

Data is property of VanderSat B.V and may only be used for the purpose specified in the service/data contract.

Contains modified Copernicus Sentinel data.

Inundation RGB (INU-RGB)

Inundation is derived from Sentinel-1 data using an approach based on histogram matching of know open water and grassland histograms in combination with change detection and thresholding.

INU-RGB

A false colour file in which the Red channel is taken from the VV polarisation and the Green and Blue Channel the VH polarisation.

Inundation Classes

Key Specification

Name

Inundation

API name

INU-S1-RGB_V001_10

Abbreviation

INU-S1-RGB_V001_10

Versions

Version 0.9: Noordwijk, Version 0.9: Noordwijk

Unit

Classes (7) or RGB

Pixel size

10x10m, 8.9831528412e-05 degree

Temporal resolution

3-6 days (location dependent)

Coverage

Global

Data availability

October 2014 - Present

Satellites used

Sentinel-1a/b

Available to user

12 hours after overpass of the satellites

File format

GeoTIFF, NetCDF (images), CSV (time series)

Data delivery

VanderSat API, VanderSat Viewer

Image properties

GeoTIFF properties:

Parameter

Value

Data type

Byte

Compression

LZW

Scale

1

Offset

0

Band 1

Inundation classes

NoData

255

NetCDF properties:

Parameter

Value

Data type

Byte

Compression

Zip 6

Scale

1

Offset

0

Band 1

Inundation classes

NoData

255

Terms of use

Data is property of VanderSat B.V and may only be used for the purpose specified in the service/data contract.

Contains modified Copernicus Sentinel data.

Inundation rolling mean (INU-RM)

Inundation is derived from Sentinel-1 data using an approach based on histogram matching of know open water and grassland histograms in combination with change detection and thresholding.

rolling mean of VV and VH

30 image rolling mean of the VV an VH images used as a base for the change detection.

Inundation Classes

Key Specification

Name

Inundation

API name

INU-S1-RM-VV_V001_10

Abbreviation

INU-S1-RM-VV_V001_10

Versions

Version 0.9: Noordwijk, Version 3.0: Champaign

Unit

Classes (7) or RGB

Pixel size

10x10m, 8.9831528412e-05 degree

Temporal resolution

3-6 days (location dependent)

Coverage

Global

Data availability

October 2014 - Present

Satellites used

Sentinel-1a/b

Available to user

12 hours after overpass of the satellites

File format

GeoTIFF, NetCDF (images), CSV (time series)

Data delivery

VanderSat API, VanderSat Viewer

Image properties

GeoTIFF properties:

Parameter

Value

Data type

Byte

Compression

LZW

Scale

1

Offset

0

Band 1

Inundation classes

NoData

255

NetCDF properties:

Parameter

Value

Data type

Byte

Compression

Zip 6

Scale

1

Offset

0

Band 1

Inundation classes

NoData

255

Terms of use

Data is property of VanderSat B.V and may only be used for the purpose specified in the service/data contract.

Contains modified Copernicus Sentinel data.