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configuring marsh datasets
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WeathermanTrent authored Nov 8, 2024
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---
id: marsh-ida
name: "Salt Marsh Distribution from UNEP-WCMC (WILL ADD MORE INFO)"
description: "ADD INFO"
media:
src: ::file ../stories/ian_goes_cover.jpg
alt: Hurricane Ian as seen from space as it makes landfall with the state of Florida. NASA Earth Observatory image.
author:
name: Joshua Stevens, using GOES 16 imagery courtesy of NOAA and the National Environmental Satellite, Data, and Information Service (NESDIS)
url: https://visibleearth.nasa.gov/images/150408/hurricane-ian-reaches-florida
taxonomy:
- name: Topics
values:
- Natural Disasters
- Tropical
- name: Source
values:
- Community Contributed
layers:
- id: marsh-ida
stacCol: marsh-ida
name: Salt Marsh
type: raster
description: "Salt Marsh Classification Pre-Ida (Southern Louisiana)"
zoomExtent:
- 0
- 20
sourceParams:
colormap_name: binary-salt-marsh
rescale: 0,1 # Assuming binary data (0 for non-salt marsh, 1 for salt marsh)
legend:
type: discrete
items:
- color: "#FF0000" # Red for Salt Marsh
label: "Salt Marsh"
- color: "#0000FF" # Blue for Non-Salt Marsh
label: "Non-Salt Marsh"
compare:
datasetId: marsh-ida
layerId: marsh-ida
layers:
- id: marsh-difference
stacCol: marsh-difference
name: Salt Marsh Difference
type: raster
description: "Difference in Salt Marshes Pre- and Post-Ida"
initialDatetime: newest
zoomExtent:
- 0
- 20
sourceParams:
colormap_name: binary-difference-salt-marsh
rescale: -1,1 # -1 for loss, 0 for no change, 1 for gain
legend:
type: discrete
items:
- color: "#FF0000" # Red for Loss of Salt Marsh
label: "Loss of Salt Marsh"
- color: "#FFFFFF" # White for No Change
label: "No Change"
- color: "#0000FF" # Blue for Gain of Salt Marsh
label: "Gain of Salt Marsh"
---

<Block type='wide'>
<Prose>
Harmonized Landsat Sentinel-2 (HLS) project from NASA is designed to integrate and harmonize data from multiple satellite sources, specifically the Operation Land Imager (OLI) on Landsat-8/9 and the Mult-Spectral Instrument (MSI) on Sentinel-2A/B satellites. This project aims to create a seamless surface reflectance record that is essential for various Earth Observation and monitoring tasks.

- **Temporal Extent:** Landsat-9 2021-10-31; Sentinel-2B 2017-07-06
- **Temporal Resolution:** ~3 days
- **Spatial Extent:** Global with the exception of Antarctica
- **Spatial Resolution:** 30 m x 30 m
- **Data Units:** Surface Reflectance
- **Data Type:** Research
- **Data Latency:** 2 to 3 days


**Scientific Details:**
HLS project incorporates several advanced scientific methodologies and technologies to harmonize data from the Landsat and Sentinel-2 satellites such as atmospheric correction, geographic co-registration and common gridding, bidirectional reflectance distribution normalization, and cloud-shadow masking. To calculate the Normalized Difference Vegetation Index (NDVI) from the HLS-2 Dataset, we utilize the red and near-infrared bands to assess vegetation health by applyin the formula NDVI = NIR - Red / NIR + Red, where 'NIR' refers to the near-infrared surface reflectance, and 'Red' denotes the red light surface reflectance, both harmonized from the Landsat and Sentinel satellites.
</Prose>
</Block>

<Block>
<Prose>
## Source Data Product Citation
Claverie, M., Ju, J., Masek, J. G., Dungan, J. L., Vermote, E. F., Roger, J.-C., Skakun, S. V., & Justice, C. (2018). The Harmonized Landsat and Sentinel-2 surface reflectance data set. Remote Sensing of Environment, 219, 145-161.
## Disclaimer
All data provided in VEDA has been transformed from the original format (TIFF) into Cloud Optimized GeoTIFF ([COG](https://www.cogeo.org/)). Careful quality checks are used to ensure data transformation has been performed correctly.

## Key Publications
Su Ye, John Rogan, Zhe Zhu, J. Ronald Eastman, A near-real-time approach for monitoring forest disturbance using Landsat time series: stochastic continuous change detection, Remote Sensing of Environment, Volume 252, 2021,112167, ISSN 0034-4257, (https://doi.org/10.1016/j.rse.2020.112167)[https://doi.org/10.1016/j.rse.2020.112167].


Su Ye, Zhe Zhu, Guofeng Cao, Object-based continuous monitoring of land disturbances from dense Landsat time series, Remote Sensing of Environment, Volume 287, 2023, 113462, ISSN 0034-4257, (https://doi.org/10.1016/j.rse.2023.113462)[https://doi.org/10.1016/j.rse.2023.113462].

### Other Relevant Publications
Ye, S., Zhu, Z., & Suh, J. W. (2024). Leveraging past information and machine learning to accelerate land disturbance monitoring. Remote Sensing of Environment, 305, 114071.

## Acknowledgment
This work has been supported by the USGS-NASA Landsat Science Team (LST) Program for Toward Near Real-time Monitoring and Characterization of Land Surface Change for the Conterminous US (140G0119C0008)

## License
[Creative Commons Attribution 1.0 International](https://creativecommons.org/publicdomain/zero/1.0/legalcode) (CC BY 1.0)

</Prose>
</Block>

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