Arctic Lake Database

Use Sentinel-2 to: (a) track variability in individual lakes' surface area, and (b) produce a lake occurrence mask across the Arctic.

Part 1: LakeScan   |   Scan the entire landscape to identify lakes while filtering out rivers, shadows, burn scars, etc.

Part 2: LakeTrack  |  Identify precise locations of individual lakes and record their changes through time.

LakeScan Description

LakeScan tells us where to point our water classification and also provides the basis for tracking lakes as objects rather than unrelated pixels. The output of LakeScan is a shapefile of buffered lakes, which is in turn the input for LakeTrack.

LakeScan Scripts:

S2bgrnExport.ipynb OR S2maskedmosaic.ipynb
      Rapidly filter, mask, visualize, and export Sentinel-2 images from GEE.
S2download.ipynb
    Batch download Sentinel-2 images
S2imStack.ipynb
    Combine the R,G,B,NIR Sentinel-2 downloads into 4-band images
Predictor.ipynb
    Use the UNET model to predict lake locations
dilate2vectorize.ipynb
    Buffer UNET lake predictions and convert to shapefile
merge_swot2unet.py
merge buffered SWOT lake shapefile to UNET outputs

LakeTrack Description:

Based on all available Sentinel-2 images, LakeTrack provides a final lake occurrence mask for customizable areas and timeframes as well as a timeseries of each lake's surface area. \

LakeTrack Scripts:

LakeOccurrence.ipynb
Process images in Earth Engine and export a lake occurrence composite image
LakeOccurrenceBatches.ipynb
Batch processing of ROIs to process images in Earth Engine and export a lake occurrence composite
OccurrenceProcessing.py
Clean lake occurrence rasters using segmentation techniques, and convert to shapefiles
mask2seed.ipynb
Create new buffered lake shapefile based on the lake occurrence raster
LakeTimeSeriesv3.ipynb
Process images in Earth Engine and export near-daily observations of water extent per lake
LakeTimeSeriesv1.ipynb
    Process images in Earth Engine and export near-daily observations of water extent
LakeTimeSeriesv2visualize.ipynb
    Process images in Earth Engine and export a lake occurrence composite image
TimeSeriesConcatv1.ipynb
    Combine Earth Engine exports into indexed timeseries for each lake.