This repo contains code and tutorials for the TerraVibes Tech Session at the 2022 Digital Ag Hackathon by Cornell. TerraVibes is a research platform/tool for obtaining unique and deep insights from curated earth observation data and build models by combining them with other earth observation modalities.
Details on how to set up your vitual machine and download the available data from blob storage are provided in the azure_tutorial.pdf document.
You can download the data from blob storage using the links below. We recommend using azcopy (for more information check azure_tutorial.pdf). To get access, add the provided SAS token in the <SAS-TOKEN> placeholder in the commands below. Change the <DATA-DIR> placeholder below to the local directory of your preference.
- To download the preprocessed NDVI data use following command:
azcopy copy "https://digitalag22.blob.core.windows.net/ndvi?<SAS-TOKEN>" <DATA-DIR> --recursive
- To download the SpaceEye data use following command:
azcopy copy "https://digitalag22.blob.core.windows.net/spaceeye-data?<SAS-TOKEN>" <DATA-DIR> --recursive
We recommend downloading the data before going through the notebooks.
We recommend using conda to manage the packages required on this project. The dependencies are defined in the file environment.yaml. A conda environment can be created using the command below:
conda env create -f environment.yaml
You should then activate the environment to have access to all the installed requirements.
conda activate crop
There are two notebooks included in this tutorial. The first notebook is an exploration of the provided SpaceEye and NDVI data, where we demonstrate how to load and visualize the provided multispectral images, as well as how to compute vegetation indices such as the Normalized Difference Vegeration Index (NDVI). NDVI is a vegetation index widely used for environmental impact assessment, agricultural evaluation, and land use change metrics. It evaluates vegetation by estimating the contrast between near infrared (which vegetation strongly reflects) and red light (which vegetation absorbs).
The second notebook demonstrates how to train a UNet to segment crops using NDVI timeseries from SpaceEye and CDL as ground-truth data. The network is trained on chips/patches of NDVI values over the whole year. Targets come from CDL at 30m resolution and are upsampled to 10m resolution via nearest neighbor interpolation.
We provide two years (2019 and 2020) of daily cloud-free Sentinel 2 images computed via SpaceEye and preprocessed NDVI values at a 10-day interval for a 10800km² area in Washington state. This data can be used with the provided code or for other activities in the hackathon.
NDVI data is provided as two tiff files (for 2019 and 2020, respectively), each with 37 bands. Each band provides NDVI values for one day (starting at Jan. 1st), with a 10-day interval between successive bands.
Each day of SpaceEye data is separated in a grid, with each cell being a separate tiff file. We provide the regions covered by each grid cell (and the total region of interest) in GeoJSON files with two different coordinate systems (CRSs): grid_epsg_5070.geojson (EPSG:5070, the same CRS as CDL rasters), or grid_epsg_4326.geojson (EPSG:4326, WGS84, lat-long). The grid is shown in the image below.
You can read the files using geopandas
import geopandas as gpd
df = gpd.read_file("grid_epsg_4326.geojson").set_crs("epsg:4326")
The tutorial showcases SpaceEye, which is a neural-network-based solution to recover pixels occluded by clouds in satellite images. SpaceEye leverages radio frequency (RF) signals in the ultra/super-high frequency band that penetrate clouds to help reconstruct the occluded regions in multispectral images. We introduce the first multi-modal multi-temporal cloud removal model that uses publicly available satellite observations and produces daily cloud-free images.
[1] M. Zhao, P. A. Olsen, and R. Chandra, “Seeing Through Clouds in Satellite Images,” arXiv:2106.08408, Jun. 2021, Accessed: Mar. 07, 2022. [Online]. Available: http://arxiv.org/abs/2106.08408
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