MSLSP 30 m EVIMax image over the Mississippi River flood plain in northeastern Louisiana, 2019.
View full-size imageThe Multi-Source Land Surface Phenology (LSP) Yearly North America 30 meter (m) Version 1.1 product (MSLSP) provides a Land Surface Phenology product for North America derived from Harmonized Landsat Sentinel-2 (HLS) data. Data from the combined Landsat 8 Operational Land Imager (OLI) and Sentinel-2A and 2B Multispectral Instrument (MSI) provides the user community with dates of phenophase transitions, including the timing of greenup, maturity, senescence, and dormancy at 30 meter spatial resolution. These data sets are useful for a wide range of applications, including ecosystem and agro-ecosystem modeling, monitoring the response of terrestrial ecosystems to climate variability and extreme events, crop-type discrimination, and land cover, land use, and land cover change mapping.
Provided in the MSLSP product are layers for percent greenness, onset greenness dates, Enhanced Vegetative Index (EVI2) amplitude, and maximum EVI2, and data quality information for up to two phenological cycles per year. For areas where the data values are missing due to cloud cover or other reasons, the data gaps are filled with good quality values from the year directly preceding or following the product year. A low resolution browse image representing maximum EVI is also available for each MSLSP30NA granule.
Modest changes were made to the spline fitting algorithm used to estimate the MSLSP30NA product in V011. Only gaps greater than 20 days were filled using observations from the outside of the target year to reduce the computational burden. Sensitivity analyses demonstrated that this change had negligible impact on product results.
The Quality Assurance (QA) fields were updated to reflect the changes in the gap-filling. Version 1 included QA values from 1-7, whereas Version 1.1 includes QA values from 1-6, 9, and 10.
Peak date corresponding to the maximum EVI2 value in a growth cycle (Peak and Peak_2) and number of days with clear observations in calendar year (numObS) layers were added.
| Characteristic | Description |
|---|---|
| Collection | MuSLI |
| DOI | 10.5067/Community/MuSLI/MSLSP30NA.011 |
| File Size | ~100 MB |
| Temporal Resolution | Yearly |
| Temporal Extent | 2016-01-01 to 2019-12-31 |
| Spatial Extent | North America |
| Coordinate System | Universal Transverse Mercator (UTM) |
| Datum | World Geodetic System (WGS84) |
| File Format | netCDF-4 |
| Geographic Dimensions | 110 km x 110 km |
| Characteristic | Description |
|---|---|
| Number of Science Dataset (SDS) Layers | 26 |
| Columns/Rows | 3660 x 3660 |
| Pixel Size | 30 m |
| SDS Name | Description | Units | Data Type | Fill Value | No Data Value | Valid Range | Scale Factor |
|---|---|---|---|---|---|---|---|
| 50PCGD¹ | 50 Percent Greenness Decrease (Date of 50% greenness decrease) | Day | 16-bit signed integer | 32767 | N/A | -181 to 548 | N/A |
| 50PGCD_2¹ | Cycle 2 - 50 Percent Greenness Decrease (Date of 50% greenness decrease) | Day | 16-bit signed integer | 32767 | N/A | -181 to 548 | N/A |
| 50PCGI¹ | 50 Percent Greenness Increase (Date of 50% greenness increase) | Day | 16-bit signed integer | 32767 | N/A | -181 to 548 | N/A |
| 50PCGI_2¹ | Cycle 2 - 50 Percent Greenness Increase (Date of 50% greenness increase) | Day | 16-bit signed integer | 32767 | N/A | -181 to 548 | N/A |
| EVIamp | EVI2 Amplitutde during vegetation cycle | N/A | 16-bit signed integer | 32767 | N/A | 0 to 10000 | 0.0001 |
| EVIamp_2 | Cycle 2 - EVI2 Amplitutde during vegetation cycle | N/A | 16-bit signed integer | 32767 | N/A | 0 to 10000 | 0.0001 |
| EVIarea | Integrated EVI2 during vegetative cycle | N/A | 16-bit signed integer | 32767 | N/A | 0 to 32766 | 0.01 |
| EVIarea_2 | Cycle 2 - Integrated EVI2 during vegetative cycle | N/A | 16-bit signed integer | 32767 | N/A | 0 to 32766 | 0.01 |
| EVImax | Maximum EVI2 during vegetation cycle | N/A | 16-bit signed integer | 32767 | N/A | 0 to 10000 | 0.0001 |
| EVImax_2 | Cycle 2 - Maximum EVI2 during vegetation cycle | N/A | 16-bit signed integer | 32767 | N/A | 0 to 10000 | 0.0001 |
| NumCycles | Number of phenological cycles | Number | 16-bit signed integer | 32767 | N/A | 0 to 6 | N/A |
| OGD¹ | Onset Greenness Decrease (Date 10% greenness decrease) | Day | 16-bit signed integer | 32767 | N/A | -181 to 548 | N/A |
| OGD_2¹ | Cycle 2 - Onset Greenness Decrease (Date 10% greenness decrease) | Day | 16-bit signed integer | 32767 | N/A | -181 to 548 | N/A |
| OGI¹ | Onset Greenness Increase (Date of 15% greenness increase) | Day | 16-bit signed integer | 32767 | N/A | -181 to 548 | N/A |
| OGI_2¹ | Cycle 2 - Onset Greenness Increase (Date of 15% greenness increase) | Day | 16-bit signed integer | 32767 | N/A | -181 to 548 | N/A |
| OGMn¹ | Onset Greenness Minimum (Date of 85% greenness decrease) | Day | 16-bit signed integer | 32767 | N/A | -181 to 548 | N/A |
| OGMn_2¹ | Cycle 2 - Onset Greenness Minimum (Date of 85% greenness decrease) | Day | 16-bit signed integer | 32767 | N/A | -181 to 548 | N/A |
| OGMx¹ | Onset Greenness Maximum (Date of 90% greenness increase) | Day | 16-bit signed integer | 32767 | N/A | -181 to 548 | N/A |
| OGMx_2¹ | Cycle 2 - Onset Greenness Maximum (Date of 90% greenness increase) | Day | 16-bit signed integer | 32767 | N/A | -181 to 548 | N/A |
| Peak | Date of Cycle Peak | Day | 16-bit signed integer | 32767 | N/A | 1 to 366 | N/A |
| Peak_2 | Cycle 2 - Date of Cycle Peak | Day | 16-bit signed integer | 32676 | N/A | 1 to 366 | N/A |
| gdownQA | Quality Assurance for Greendown Segment | N/A | 16-bit signed integer | 32767 | N/A | 1 to 7 | N/A |
| gdownQA_2 | Cycle 2 - Quality Assurance for Greendown Segment | N/A | 16-bit signed integer | 32767 | N/A | 1 to 7 | N/A |
| gupQA | Quality Assurance for Greenup Segment | N/A | 16-bit signed integer | 32767 | N/A | 1 to 7 | N/A |
| gupQA_2 | Cycle 2 - Quality Assurance for Greenup Segment | N/A | 16-bit signed integer | 32767 | N/A | 1 to 7 | N/A |
| numObs | Number of days with clear observations in calendar year | Number | 16-bit signed integer | 32676 | N/A | 1 to 366 | N/A |
¹Some phenological cycles span multiple years therefore estimated phenometrics for a given year of interest can include dates that occur ~180 days prior to or beyond the year of interest. This is identified in the valid range from -181 to 548.
| QA Value | Description |
|---|---|
| 1 | High Quality |
| 2 | Moderate Quality |
| 3 | Poor Quality with Successful Fill from Alternative Years |
| 4 | Poor Quality with Unsuccessful Fill from Alternative Years |
| 5 | No Cycle Detected |
| 6 | Water, Algorithm Not Run |
| 7 | Border Pixels Masked in 2016 Due to HLS Processing Issue |
MuSLI product quality information is found on the MuSLI website.
Data are sparse in 2016 and early 2017, as Sentinel-2B was not yet launched, and Sentinel-2A was not fully operational, leading to poorer quality retrievals of phenology in 2016 and 2017. However, poor quality pixels can be masked with Quality Assurance (QA) flags.
Disturbance has not been explicitly accounted for or mapped, which can lead to premature detections of senescence and dormancy when sharp spectral changes occur.
Pixels with more than two growth cycles per year (e.g., alfalfa fields) may not be accurately characterized, especially if they occur in rapid succession.