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wrapper.js
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wrapper.js
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// File: S1_ARD_TEST/wrapper.js
// Version: v1.2
// Date: 2021-04-01
// Authors: Mullissa A., Vollrath A., Braun, C., Slagter B., Balling J., Gou Y., Gorelick N., Reiche J.
//****************************
// ALL PREPROCESSING
//****************************
var speckle_filter = require('users/corfobbppciren2023/Areas_Regadas_Auxiliares:speckle_filter.js');
var terrain_flattening = require('users/corfobbppciren2023/Areas_Regadas_Auxiliares:terrain_flattening.js');
var border_noise_correction = require('users/corfobbppciren2023/Areas_Regadas_Auxiliares:border_noise_correction.js');
exports.s1_preproc = function(params) {
/************************
* 0. CHECK PARAMETERS
************************/
if (params.ORBIT === undefined) params.ORBIT = 'BOTH';
if (params.SPECKLE_FILTER === undefined) params.SPECKLE_FILTER = "GAMMA MAP";
if (params.SPECKLE_FILTER_KERNEL_SIZE===undefined) params.SPECKLE_FILTER_KERNEL_SIZE = 7;
if (params.TERRAIN_FLATTENING_MODEL === undefined) params.TERRAIN_FLATTENING_MODEL = 'VOLUME';
if (params.TERRAIN_FLATTENING_ADDITIONAL_LAYOVER_SHADOW_BUFFER === undefined) params.TERRAIN_FLATTENING_ADDITIONAL_LAYOVER_SHADOW_BUFFER = 0;
if (params.FORMAT === undefined) params.FORMAT = 'DB';
if (params.DEM === undefined) params.DEM = ee.Image('USGS/SRTMGL1_003');
if (params.POLARIZATION === undefined) params.POLARIZATION = 'VVVH';
if (params.APPLY_ADDITIONAL_BORDER_NOISE_CORRECTION === undefined) params.APPLY_ADDITIONAL_BORDER_NOISE_CORRECTION = true;
if (params.APPLY_TERRAIN_FLATTENING===undefined) params.APPLY_TERRAIN_FLATTTENING = true;
if (params.APPLY_SPECKLE_FILTERING===undefined) params.APPLY_SPECKLE_FILTERING = true;
if (params.SPECKLE_FILTER_FRAMEWORK===undefined) params.SPECKLE_FILTER_FRAMEWORK = 'MULTI';
function notContains(list, value) {return list.indexOf(value) == -1;}
var orbit_required = ['ASCENDING', 'DESCENDING', 'BOTH']
if (notContains(orbit_required, params.ORBIT)) {
throw new Error("Parameter ORBIT not correctly defined")
}
var pol_required = ['VV', 'VH', 'VVVH']
if (notContains(pol_required, params.POLARIZATION)) {
throw new Error("Parameter POLARIZATION not correctly defined")
}
var model_required = ['DIRECT', 'VOLUME']
if (notContains(model_required, params.TERRAIN_FLATTENING_MODEL)) {
throw new Error("Parameter TERRAIN_FLATTENING_MODEL not correctly defined")
}
var format_required = ['LINEAR', 'DB']
if (notContains(format_required, params.FORMAT)) {
throw new Error("Parameter FORMAT not correctly defined")
}
var frame_required = ['MONO', 'MULTI']
if (notContains(frame_required, params.SPECKLE_FILTER_FRAMEWORK)) {
throw new Error("Parameter SPECKLE_FILTER_FRAMEWORK not correctly defined")
}
var sfilter_required = ['BOXCAR', 'LEE', 'GAMMA MAP'
, 'REFINED LEE', 'LEE SIGMA']
if (notContains(sfilter_required, params.SPECKLE_FILTER)) {
throw new Error("Parameter SPECKLE_FILTER not correctly defined")
}
if (params.TERRAIN_FLATTENING_ADDITIONAL_LAYOVER_SHADOW_BUFFER < 0) {
throw new Error("The TERRAIN_FLATTENING_ADDITIONAL_LAYOVER_SHADOW_BUFFER should be GREATER or EQUAL to 0")}
if (params.SPECKLE_FILTER_KERNEL_SIZE <= 0) {
throw new Error("The SPECKLE_FILTER_KERNEL_SIZE should be a positive integer")}
/************************
* 1. Data Selection
************************/
// Select S1 GRD ImageCollection
var s1 = ee.ImageCollection('COPERNICUS/S1_GRD_FLOAT')
.filter(ee.Filter.eq('instrumentMode', 'IW'))
.filter(ee.Filter.eq('resolution_meters', 10))
.filter(ee.Filter.listContains('transmitterReceiverPolarisation', 'VH'))
.filterDate(params.START_DATE, params.STOP_DATE)
.filterBounds(params.GEOMETRY);
//select orbit
if (params.ORBIT !== 'BOTH'){s1 = s1.filter(ee.Filter.eq('orbitProperties_pass', params.ORBIT))}
//select polarization
if (params.POLARIZATION=='VV') { s1 = s1.select(['VV','angle'])}
else if (params.POLARIZATION=='VH') {s1 = s1.select(['VH','angle'])}
else if (params.POLARIZATION=='VVVH') {s1 = s1.select(['VV', 'VH', 'angle'])}
//print('Number of images in collection: ', s1.size());
/************************************
* 2. Additional Border Noise Correction
****************************** ******/
if (params.APPLY_ADDITIONAL_BORDER_NOISE_CORRECTION) {
var s1_1 = s1.map(border_noise_correction.f_mask_edges)
//print('ADDITIONAL BORDER NOISE CORRECTION COMPLETED')
}
else {s1_1 = s1}
/*************************
* 3. Speckle Filtering
*************************/
if (params.APPLY_SPECKLE_FILTERING) {
if (params.SPECKLE_FILTER_FRAMEWORK == 'MONO') {
s1_1 = ee.ImageCollection(speckle_filter.MonoTemporal_Filter(s1_1, params.SPECKLE_FILTER_KERNEL_SIZE, params.SPECKLE_FILTER ))
//print('MONO-TEMPORAL SPECKLE FILTERING COMPLETED')
}
else {
s1_1 = ee.ImageCollection(speckle_filter.MultiTemporal_Filter(s1_1, params.SPECKLE_FILTER_KERNEL_SIZE, params.SPECKLE_FILTER,params.SPECKLE_FILTER_NR_OF_IMAGES ));
//print('MULTI-TEMPORAL SPECKLE FILTERING COMPLETED')
}
}
/***************************************
* 4. Radiometric Terrain Normalization
****************************************/
if (params.APPLY_TERRAIN_FLATTENING) {
s1_1 = ee.ImageCollection(terrain_flattening.slope_correction(s1_1, params.TERRAIN_FLATTENING_MODEL, params.DEM, params.TERRAIN_FLATTENING_ADDITIONAL_LAYOVER_SHADOW_BUFFER));
//print('RADIOMETRIC TERRAIN NORMALIZATION COMPLETED')
}
//Clip to roi (input)
if (params.CLIP_TO_ROI) {s1 = s1.map(function(image) {
return image.clip(params.GEOMETRY)})}
//Clip to roi (processed)
if (params.CLIP_TO_ROI) {s1_1 = s1_1.map(function(image) {
return image.clip(params.GEOMETRY)})}
return [s1, s1_1]
};