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generate_agc_map_ui.js
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generate_agc_map_ui.js
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/**** Start of imports. If edited, may not auto-convert in the playground. ****/
var eeL8SrAgcModel = ee.FeatureCollection("projects/thicket-agc/assets/ee_l8_sr_agc_model_v3"),
stepAridAndValleyThicket = ee.FeatureCollection("projects/thicket-agc/assets/step_arid_and_valley_thicket");
/***** End of imports. If edited, may not auto-convert in the playground. *****/
/*
Concept demonstration for extension of local aboveground carbon model to the thicket biome
Copyright Leftfield Geospatial
Email: info@leftfield.online
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
var cloudMasking = require("users/dugalh/extend_thicket_agc:extend_thicket_agc/cloud_masking.js");
var thicketBoundary = stepAridAndValleyThicket; // STEP derived thicket boundaries
// obtain Landsat 8 SR image collection of thicket around time of GEF-5 SLM WV3 acquisition
var eeAgcModel = eeL8SrAgcModel;
var images = ee.ImageCollection("LANDSAT/LC08/C02/T1_L2")
.filterDate("2017-09-01", "2017-12-30")
.filterMetadata("GEOMETRIC_RMSE_MODEL", "less_than", 10)
.filterBounds(thicketBoundary)
.map(cloudMasking.landsat8SrCloudMask);
// composite the image collection
var image = images.median();
var model = {
m: ee.Number(eeAgcModel.first().get("m")),
c: ee.Number(eeAgcModel.first().get("c")),
};
// apply EE AGC model to image
function findAgc(image) {
var rnImage = image.expression("(R / (R + G + B + RE))", {
R: image.select("SR_B4"),
G: image.select("SR_B3"),
B: image.select("SR_B2"),
RE: image.select("SR_B5"),
});
return ee.Image(rnImage.log10()
.multiply(model.m)
.add(model.c)
.set("system:time_start", image.get("system:time_start"))
).rename("AGC");
}
// Apply the model to find the EE AGC image
var agcImage = findAgc(image).uint8();
var agcMaskedImage = agcImage.clipToCollection(thicketBoundary);
// Create the map panel with AGC overlay
var mapPanel = ui.Map();
mapPanel.setControlVisibility({
all: false,
zoomControl: true,
mapTypeControl: true,
});
mapPanel.setOptions("HYBRID");
mapPanel.centerObject(thicketBoundary);
var vis = {
min: 0,
max: 50,
palette: "red,yellow,green",
opacity: 1.0,
};
mapPanel.addLayer(agcMaskedImage, vis, "AGC");
// Create side tool panel
// title and description
var titleLabel = ui.Label("Thicket Aboveground Carbon (AGC)", {
fontWeight: "bold",
fontSize: "24px",
color: "SteelBlue",
});
var summaryLabel = ui.Label(
"Concept demonstration of extended AGC mapping in thicket",
{ fontSize: "14px" }
);
var detailLabel = ui.Label(
"A localised AGC model is calibrated to coarser resolution Landsat 8 imagery and applied to the biome.",
{ fontSize: "11px" }
);
var noteLabel = ui.Label(
"Note that AGC accuracy outside the localised model study area has not been established.",
{ fontSize: "11px" }
);
var linkLabel = ui.Label(
"See the GitHub repository for more information.",
{ fontSize: "11px" },
"https://github.com/leftfield-geospatial/extend-thicket-agc"
);
var toolPanel = ui.Panel({
widgets: [titleLabel, summaryLabel, detailLabel, noteLabel, linkLabel],
layout: ui.Panel.Layout.Flow("vertical"),
style: { width: "20%" },
});
// legend and its controls
var legendTitleLabel = ui.Label("Legend", {
fontWeight: "bold",
fontSize: "20px",
color: "SteelBlue",
});
toolPanel.add(legendTitleLabel);
var legendDetailLabel = ui.Label("AGC (tC/ha)", {
fontWeight: "bold",
fontSize: "14px",
color: "black",
});
var legendCheckbox = ui.Checkbox({
label: null,
value: true,
onChange: function (value) {
mapPanel.layers().get(0).setShown(value);
},
});
var legendOpacitySlider = ui.Slider({
min: 0,
max: 1,
value: 1,
step: 0.01,
});
legendOpacitySlider.onSlide(function (value) {
mapPanel.layers().forEach(function (element, index) {
element.setOpacity(value);
});
});
var legendHeaderPanel = ui.Panel(
[legendCheckbox, legendDetailLabel, legendOpacitySlider],
ui.Panel.Layout.Flow("horizontal")
);
toolPanel.add(legendHeaderPanel);
legendOpacitySlider.setValue(0.6, true);
function makeColourBarParams(palette) {
return {
bbox: [0, 0, 1, 0.1],
dimensions: "100x10",
format: "png",
min: 0,
max: 1,
palette: palette,
};
}
var colourBarThumbnail = ui.Thumbnail({
image: ee.Image.pixelLonLat().select(0),
params: makeColourBarParams(vis.palette),
style: { stretch: "horizontal", margin: "0px 8px", maxHeight: "24px" },
});
// value labels for colour bar
var legendValuesPanel = ui.Panel({
widgets: [
ui.Label(vis.min, { margin: "4px 8px" }),
ui.Label(vis.max / 2, {
margin: "4px 8px",
textAlign: "center",
stretch: "horizontal",
}),
ui.Label(vis.max, { margin: "4px 8px" }),
],
layout: ui.Panel.Layout.flow("horizontal"),
});
toolPanel.add(colourBarThumbnail);
toolPanel.add(legendValuesPanel);
// make credits panel
var creditsTitleLabel = ui.Label("Acknowledgements", {
fontWeight: "bold",
fontSize: "20px",
color: "SteelBlue",
});
var stepDescrLabel = ui.Label(
"Thicket boundaries derived from the",
{ fontSize: "11px", margin: "4px 4px 4px 8px" }
);
var stepLinkLabel = ui.Label(
"STEP vegetation map",
{ fontSize: "11px", margin: "4px 0px" },
"https://bgis.sanbi.org/STEP/project.asp"
);
var stepPanel = ui.Panel(
[stepDescrLabel, stepLinkLabel],
ui.Panel.Layout.Flow("horizontal")
);
var gefDescrLabel = ui.Label(
"Localised AGC model produced as part of the",
{ fontSize: "11px", margin: "4px 4px 4px 8px" }
);
var gefLinkLabel = ui.Label(
"GEF-5 SLM project",
{ fontSize: "11px", margin: "4px 0px" },
"https://github.com/leftfield-geospatial/map-thicket-agc"
);
var gefPanel = ui.Panel(
[gefDescrLabel, gefLinkLabel],
ui.Panel.Layout.Flow("horizontal")
);
var creditsPanel = ui.Panel(
[creditsTitleLabel, stepPanel, gefPanel],
ui.Panel.Layout.Flow("vertical")
);
toolPanel.add(creditsPanel);
// add map and tool panels to ui
ui.root.clear();
ui.root.add(ui.SplitPanel(toolPanel, mapPanel));