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7yl4r/gee-script.js

Created July 21, 2026 02:17
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Florida Keys seagrass mapping 2026-03 in Google Earth Engine.
Raw
gee-script.js
var sandPoly =
/* color: #c9d604 */
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{
"class": 6,
"system:index": "33"
}),
ee.Feature(
ee.Geometry.Point([-81.20795364732923, 25.096870675393085]),
{
"class": 6,
"system:index": "34"
}),
ee.Feature(
ee.Geometry.Point([-81.26237030382337, 25.073239208923333]),
{
"class": 6,
"system:index": "35"
}),
ee.Feature(
ee.Geometry.Point([-81.0876190220851, 25.069818487169538]),
{
"class": 6,
"system:index": "36"
}),
ee.Feature(
ee.Geometry.Point([-81.11319656725111, 25.104643186631872]),
{
"class": 6,
"system:index": "37"
}),
ee.Feature(
ee.Geometry.Point([-81.13379593248548, 25.115679303801166]),
{
"class": 6,
"system:index": "38"
}),
ee.Feature(
ee.Geometry.Point([-81.28865455281765, 25.14148749640379]),
{
"class": 6,
"system:index": "39"
}),
ee.Feature(
ee.Geometry.Point([-81.27595161092312, 25.19431151979862]),
{
"class": 6,
"system:index": "40"
}),
ee.Feature(
ee.Geometry.Point([-81.30393241536648, 25.188874809490667]),
{
"class": 6,
"system:index": "41"
}),
ee.Feature(
ee.Geometry.Point([-81.32899497640163, 25.147703277269603]),
{
"class": 6,
"system:index": "42"
}),
ee.Feature(
ee.Geometry.Point([-81.37036536824733, 25.12252741989801]),
{
"class": 6,
"system:index": "43"
}),
ee.Feature(
ee.Geometry.Point([-81.39182304036648, 25.114911477911388]),
{
"class": 6,
"system:index": "44"
}),
ee.Feature(
ee.Geometry.Point([-81.41019080770046, 25.15050027432275]),
{
"class": 6,
"system:index": "45"
}),
ee.Feature(
ee.Geometry.Point([-81.38358329427273, 25.181418357449353]),
{
"class": 6,
"system:index": "46"
}),
ee.Feature(
ee.Geometry.Point([-81.06619302879294, 25.012562692721094]),
{
"class": 6,
"system:index": "47"
}),
ee.Feature(
ee.Geometry.Point([-81.09846536766013, 24.957170092888667]),
{
"class": 6,
"system:index": "48"
}),
ee.Feature(
ee.Geometry.Point([-81.16472665916403, 24.980201507692353]),
{
"class": 6,
"system:index": "49"
}),
ee.Feature(
ee.Geometry.Point([-81.23716776023825, 24.953123588414254]),
{
"class": 6,
"system:index": "50"
})]);
/*
This script builds on the works of the SIMM Seagrass project
and seagrass mapping of Belize from
Carolina Peralta, Digna Rueda, Tylar Murray et alli [^1].
[^1] https://code.earthengine.google.com/27d6791da181408b3a232c41dd951227
*/
// Define the date range
var startDate = '2025-01-01';
var endDate = '2025-08-01';
// ===================================================================================
// === Ground Truth data feature collection.
// ===================================================================================
// Requires a "class" property on each feature with an integer that represents each class.
// var groundTruthCollection = require("users/tylarmurray/rois:FKNMS").LizcanoSeagrass2021;
// The LizcanoSeagrass2021 ground truth collection includes only the classes:
// 0 : softbottom (aka sand)
// 1 : unused (used for hardcover (aka coral) in related collections)
// 2 : seagrass
// We add class 3: deep water to improve the accurracy of the classifier.
var groundTruthCollection = SAV2025_4_dense
.merge(SAV2025_5_sparse)
.merge(SAV2025_turbid_shallow_sand)
;
// sand points sampled from polygons
var sandSampledPoints = ee.FeatureCollection.randomPoints({
region: sandPoly,
points: 150, // adjust to be similar in number to other classes
seed: 42 // any random number. Hard-coded for reproducibility.
}).map(function(feature) {
return feature.set('class', 0);
});
groundTruthCollection = groundTruthCollection.merge(sandSampledPoints);
// === add deep water points from deep water polygon
// Sample points from deepWater polygon with class property = 3
var deepWaterSampledPoints = ee.FeatureCollection.randomPoints({
region: deepWater,
points: 150, // adjust to be similar in number to other classes
seed: 42 // any random number. Hard-coded for reproducibility.
}).map(function(feature) {
return feature.set('class', 3);
});
groundTruthCollection = groundTruthCollection.merge(deepWaterSampledPoints);
// summary of final classes:
// 0 : softbottom (aka sand)
// 1 : hardcover (aka coral)
// 2 : seagrass
// 3 : deep water
//
// ===================================================================================
// === Prepare Image Collection
// ===================================================================================
// Filter the collection based on the defined filters
var imageCollection = ee.ImageCollection('COPERNICUS/S2_SR_HARMONIZED')
.filterBounds(require("users/tylarmurray/rois:FKNMS").bb)
.filterDate(startDate, endDate)
.filter(ee.Filter.lte('CLOUDY_PIXEL_PERCENTAGE',30))
;
// ===================================================================================
// === Create the Seagrass Layer
// ===================================================================================
var getSeagrass = require("users/tylarmurray/simm-seagrass:getSeagrass_sentinel_2").getSeagrass;
var result = getSeagrass({
imageCollection: imageCollection,
sandPoly: sandPoly,
groundTruthCollection: groundTruthCollection,
samplingBands: [
'B2','B3','B4','B5','B8','B2B3','bathymetry'
]
});
Map.addLayer(
result.classifiedSVM,
{
min: 0,
max: 6,
palette: [
"#FFF5E1", // 0 white sand
"#FF6F61", // 1 orange coral
"#8E44AD", // 2 purple seagrass
"#3498DB", // 3 blue deepwater
"#1E5631", // 4 dark green dense SAV
"#7FB77E", // 5 light green sparse SAV
"#8c8962" // 6 cloudy water over shallow sand
]
},
"SVM Classification",
true
)
print("NOTE: these accuracy measurements re-use training points, not a separate collection of validation points. These are only for assessing how well the classifier fits the given points.")
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