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README.md

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This repository contains code used in a manuscript that is submitted for peer review. The code extracts albedo data from various sources, including MOD10A1.006, MYD10A1.006, Harmonized Satellite Albedo, and Sentinel-3 bare ice albedo. The data is extracted at randomly generated sampling sites over the entire Greenland Ice Sheet.
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```
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Feng, S., Wehrlé, A., Cook, J.M., Anesio, A.M., Box, J.E., Benning, L.G., Tranter, M., 2024. The apparent effect of orbital drift on time series of MODIS MOD10A1 albedo on the Greenland ice sheet. Sci. Remote Sens. 9, 100116. https://doi.org/10.1016/j.srs.2023.100116
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```
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## Albedo Extraction
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- [gee/randomSampleBuffer.js](gee/randomSampleBuffer.js)
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- [gee/randomAlbedoExtraction.js](gee/randomAlbedoExtraction.js)
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It calculates the orbital drift (d(t)) at pixel level and adjusts the $median\Delta\alpha(t)$ for each pixel individually.
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The change is made to enable users to do a quick assessement of the d(t) globally.
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The area of interest covers the entire Greenland Ice Sheet and glaciers recorded in the GLIMS database.
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It's updated to MOD10A1.061 and MYD10A1.061 now.
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<!-- Due to limitations of GEE, the map tile projection cannot be changed. A better visulization is available in a separate web map ([MOD-orbit-drift](https://code.earthengine.google.com/6a1271c481952c663a6a3a4e54ae06c2), EPSG:3411). -->
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# citation
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```
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@article{FENG2024100116,
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title = {The apparent effect of orbital drift on time series of MODIS MOD10A1 albedo on the Greenland ice sheet},
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journal = {Science of Remote Sensing},
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volume = {9},
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pages = {100116},
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year = {2024},
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issn = {2666-0172},
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doi = {https://doi.org/10.1016/j.srs.2023.100116},
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url = {https://www.sciencedirect.com/science/article/pii/S266601722300041X},
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author = {Shunan Feng and Adrien Wehrlé and Joseph Mitchell Cook and Alexandre Magno Anesio and Jason Eric Box and Liane G. Benning and Martyn Tranter},
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keywords = {Orbit drift, MODIS, Albedo, Greenland ice sheet, Time series, Google Earth Engine}}
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```
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```
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+---analysis

gee/MOD-orbit-drift-viewer.js

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@@ -21,7 +21,7 @@ var iceMask = ee.ImageCollection([
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glims.rename('ice_mask')
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]).mosaic().eq(1);
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var mod = ee.ImageCollection('MODIS/006/MOD10A1').filter(imgfilter)
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var mod = ee.ImageCollection('MODIS/061/MOD10A1').filter(imgfilter)
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.map(function(image){
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return image.select(['Snow_Albedo_Daily_Tile'])
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.rename('MODalbedo')
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// .set({date: ee.Date(image.get('system:time_start')).format('YYYY-MM-DD')});
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});
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var myd = ee.ImageCollection('MODIS/006/MYD10A1').filter(imgfilter)
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var myd = ee.ImageCollection('MODIS/061/MYD10A1').filter(imgfilter)
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.map(function(image){
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return image.select(['Snow_Albedo_Daily_Tile'])
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.rename('MYDalbedo')
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value: 'MODIS Orbit Drift Effect',
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style: {fontWeight: 'bold', fontSize: '24px', margin: '10px 5px'}
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}),
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ui.Label('This app allows you to visualize the orbit drift effect (d(t)) on time series of MOD albedo, and obtain summer time series of MOD (MOD10A1.006) and MYD (MYD10A1.006) albedo. ' +
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ui.Label('This app allows you to visualize the orbit drift effect (d(t)) on time series of MOD albedo, and obtain summer time series of MOD (MOD10A1.061) and MYD (MYD10A1.061) albedo. ' +
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'Simply click and draw a point on the map! ' ),
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ui.Label('NOTE: this web app calculates d(t) at pixel level for the entire Greenland Ice Sheet and glaciers recorded in the GLIMS database. '+
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'So the median\u0394\u03B1 is adjusted for each pixel individually.')
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panel: ui.Panel([
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ui.Label("The Deep Purple project receives funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme under grant agreement No 856416."),
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ui.Label("https://www.deeppurple-ercsyg.eu/home", {}, "https://www.deeppurple-ercsyg.eu/home"),
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ui.Label("https://github.com/fsn1995/orbit-drift-MODIS-ice-albedo", {}, "https://github.com/fsn1995/orbit-drift-MODIS-ice-albedo")
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ui.Label("https://github.com/fsn1995/orbit-drift-MODIS-ice-albedo", {}, "https://github.com/fsn1995/orbit-drift-MODIS-ice-albedo"),
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ui.Label("Feng, S., Wehrlé, A., Cook, J.M., Anesio, A.M., Box, J.E., Benning, L.G., Tranter, M., 2024. The apparent effect of orbital drift on time series of MODIS MOD10A1 albedo on the Greenland ice sheet. Sci. Remote Sens. 9, 100116. https://doi.org/10.1016/j.srs.2023.100116", {}, "https://doi.org/10.1016/j.srs.2023.100116")
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])
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};
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}

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