HOT - [Zone 42N, Row 40 to 49] Robust trends of landscape dynamics in the permafrost region with temporally dense Landsat time-series stacks

Nitze, Ingmar; Grosse Guido

The robust Theil-Sen regression algorithm was used to calculate trend parameters (slope, intercept, confidence intervals) on Landsat time-series stack in large parts of the permafrost region. The trend calculation was applied to different widely used multi-spectral indices (Landsat Tasseled Cap, NDVI, NDWI, NDMI), which serve as proxies for land surface conditions. Analysis was carried over the entire Landsat archive for the peak summer season (July, August) between years 1999 and 2014. The dataset is split up into 30x30 km tiles. Each tile contains 8 raster files, projected in UTM (the zones are file name indicated). There are three different data product types with following properties:

  • Trends

Trend components for each multi-spectral index with 4 bands. Band 1: Slope (linear change) per decade; Band 2: Intercept (interpolated value on July 1st 2014); Band 3: Lower Confidence Interval of Slope (alpha=0.05); Band 4: Upper Confidence Interval of Slope (alpha=0.05).

  • Raster metadata

Raster file with the Number of valid Observations (NObs), First Observation (FObs), and Last Observation (LObs) during the observation period.

  • Visual representation of Tasseled Cap slopes

A visual representation of the trend components of tasseled cap indices (as shown in the publication) is provided as a georeferenced PNG-image, which can be used in any image viewer, GIS or remote sensing software. The Red-Green-Blue-Composite is the visualisation of the trends of Tasseled Cap Brightness (TCBR) on Red, Tasseled Cap Greeness (TCGR) on Green and Tasseled Cap Wetness (TCWE) on Blue.

To request access to data please contact GlobPermafrost.

Interested parties will be granted the user password.

Data and Resources

Additional Info

Field Value
Identifier
Project(s) ESA GlobPermafrost; ERC PETACARB
Institute AWI Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung
Source
Publication Date
Version 0.1
Product group Hotspot Region of Permafrost Change HOT
Product Land Surface Change
Sensor Landsat
Bands/Layers
  • Trend file [4 bands: Slope (SL), Intercept (IC), Upper and Lower Confidence Intervals (CIL, CIU) ]
  • Metadata file [1 band: Number of Observations (NObs)]
  • Red-Green-Blue-Composite of Trends of TCBR, TCGR and TCWE
Variables [Units]
  • Trend of Tasseled Cap Brightness (TCBR)
  • Trend of Tasseled Cap Greenness (TCGR)
  • Trend of Tasseled Cap Wetness (TCWE)
  • Trend of NDVI (Normalized Difference Vegetation Index)
  • Trend of NDMI (Normalized Difference Moisture Index)
  • Trend of NDWI (Normalized Difference Water Index)
Region Western Siberia
Spatial Reference EPSG:32642 WGS 84 / UTM zone 42N
Spatial Resolution 30 m
Spatial Coverage
Temporal Coverage
Temporal Resolution
Format Geotiff
end_time 2014-08
keywords Hotspot Region of Permafrost Change, NDMI, NDVI, NDWI, Tasseled Cap
start_time 1999-07
units ["Slope, Upper Confidence Interval (CIU) and Lower Confidence Interval (CIL): Trend per Decade", "Intercept (IC): Index Value", "Number of Observations (NObs): Unitless", "First Observation (FObs), Last Observation (LObs): Date"]

Dataset extent

Map tiles by Stamen Design, under CC BY 3.0. Data by OpenStreetMap, under CC BY SA.