Google Earth Engine JavaScript API ee.Feature
Sivarajah Mylevaganamvisibility
…
description
17 pages
link
1 file
Google Earth Engine
JavaScript
API
ee.Feature
Prepared By: Sivarajah Mylevaganam
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Table of Contents
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ee.Feature(geometry, properties)
area(maxError, proj)
bounds(maxError, proj)
buffer(distance, maxError, proj)
centroid(maxError, proj)
containedIn(right, maxError, proj)
contains(right, maxError, proj)
convexHull(maxError, proj)
copyProperties(source, properties, exclude)
cutLines(distances, maxError, proj)
difference(right, maxError, proj)
disjoint(right, maxError, proj)
dissolve(maxError, proj)
distance(right, maxError, proj)
get(property)
getInfo(callback)
getMap(visParams, callback)
id()
intersection (right, maxError, proj)
intersects(right, maxError, proj)
length (maxError, proj)
perimeter(maxError, proj)
propertyNames()
select(propertySelectors, newProperties, retainGeometry)
set(var_args)
setGeometry(geometry)
setMulti(properties)
simplify(maxError, proj)
symmetricDifference(right, maxError, proj)
toArray(properties)
toDictionary(properties)
transform(proj, maxError)
union(right, maxError, proj)
withinDistance(right, distance, maxError, proj)
References
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1) ee.Feature(geometry, properties)
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var COLOR = {
RED: 'ff0000',
BLACK:'000000',
GREEN:'00ff00'
};
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var filteredRecord=statesData.filter(ee.Filter.gt("high_record", 44.4));
var firstRecord=filteredRecord.first();
var pFeaturefromComputedObject=ee.Feature(firstRecord);
var pRectangle1 = ee.Geometry.Rectangle(-84.46, 39.71, -82.18, 41.12);
var pRectangle2 = ee.Geometry.Rectangle(-82.18, 39.71, -81.18, 41.12);
var pFeaturefromGeometry=ee.Feature(pRectangle1);
var pGeoJSON=pRectangle2.toGeoJSON();
print(pGeoJSON);
var pFeaturefromGeoJSON=ee.Feature(pGeoJSON);
var statesData = ee.FeatureCollection('ft:1dZ78QI6P_HrZ6oabSKitytOhWM__fI9O1ayP4AoI');
Map.addLayer(pFeaturefromGeometry, {'color': COLOR.RED});
Map.addLayer(pFeaturefromGeoJSON, {'color': COLOR.BLACK});
Map.addLayer(pFeaturefromComputedObject, {'color': COLOR.GREEN});
Map.setCenter(-84.46, 39.71, 8);
2) area(maxError, proj)
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var COLOR = {
RED: 'ff0000',
BLACK:'000000'
};
var pPolygon = ee.Geometry.Polygon(-107.49, 36.04, -106.49, 36.84, -108.2, 36.9);
var pFeaturefromGeometry=ee.Feature(pPolygon);
//Coordinate system
var areaGeometry=pFeaturefromGeometry.area();
print(areaGeometry);
Map.addLayer(pFeaturefromGeometry, {'color': COLOR.RED});
Map.setCenter(-107.49, 36.04, 8);
3) bounds(maxError, proj)
1. var COLOR = {
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RED: 'ff0000',
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BLACK:'000000'
4. };
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6. var pPolygon = ee.Geometry.Polygon(-107.49, 36.04, -106.49, 36.84, -108.2, 36.9);
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var pFeaturefromGeometry=ee.Feature(pPolygon);
var pBounds=pFeaturefromGeometry.bounds();
Map.addLayer(pPolygon, {'color': COLOR.BLACK});
Map.addLayer(pBounds, {'color': COLOR.RED});
Map.setCenter(-107.49, 36.04, 8);
4) buffer(distance, maxError, proj)
1. var COLOR = {
2.
RED: 'ff0000',
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BLACK:'000000'
4. };
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6. var statesData = ee.FeatureCollection('ft:1dZ78QI6P_HrZ6oabSKitytOhWM__fI9O1ayP4AoI');
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print(statesData);
Map.addLayer(statesData);
var filteredRecord=statesData.filter(ee.Filter.gt("high_record", 44.4));
if (filteredRecord!= null){
var firstRecord=filteredRecord.first();
var bufferedFeature=ee.Feature(firstRecord).buffer(100000);
print(firstRecord);
print(bufferedFeature);
Map.addLayer(bufferedFeature, {'color': COLOR.RED});
5) centroid(maxError, proj)
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var COLOR = {
RED: 'ff0000',
BLACK:'000000'
};
var pPolygon = ee.Geometry.Polygon(-107.49, 36.04, -106.49, 36.84, -108.2, 36.9);
var pFeaturefromGeometry=ee.Feature(pPolygon);
var pCentroid=pFeaturefromGeometry.centroid();
print(pCentroid);
Map.addLayer(pFeaturefromGeometry, {'color': COLOR.RED});
Map.addLayer(pCentroid, {'color': COLOR.BLACK});
Map.setCenter(-107.49, 36.04, 8);
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6) containedIn(right, maxError, proj)
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var COLOR = {
RED: 'ff0000',
BLACK:'000000',
GREEN:'00ff00'
};
var pRectangle1 = ee.Geometry.Rectangle(-107.49, 36.04, -106.49, 36.84);
var pRectangle2 = ee.Geometry.Rectangle(-107.19, 36.04, -106.49, 36.84);
var pRectangle3 = ee.Geometry.Rectangle(-107.19, 36.24, -107.29, 36.64);
var pFeaturefromGeometry1=ee.Feature(pRectangle1);
var pFeaturefromGeometry2=ee.Feature(pRectangle2);
var pFeaturefromGeometry3=ee.Feature(pRectangle3);
var pRec2ContainedInRec1=pFeaturefromGeometry2.containedIn(pFeaturefromGeometry1);
print(pRec2ContainedInRec1);
var pRec3ContainedInRec1=pFeaturefromGeometry3.containedIn(pFeaturefromGeometry1);
print(pRec3ContainedInRec1);
Map.addLayer(pFeaturefromGeometry1, {'color': COLOR.RED});
Map.addLayer(pFeaturefromGeometry2, {'color': COLOR.BLACK});
Map.addLayer(pFeaturefromGeometry3, {'color': COLOR.GREEN});
Map.setCenter(-107.49, 36.04, 8);
7) contains(right, maxError, proj)
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var COLOR = {
RED: 'ff0000',
BLACK:'000000',
GREEN:'00ff00'
};
var pRectangle1 = ee.Geometry.Rectangle(-107.49, 36.04, -106.49, 36.84);
var pRectangle2 = ee.Geometry.Rectangle(-107.19, 36.04, -105.49, 36.84);
var pRectangle3 = ee.Geometry.Rectangle(-107.19, 36.24, -107.29, 36.64);
var pFeaturefromGeometry1=ee.Feature(pRectangle1);
var pFeaturefromGeometry2=ee.Feature(pRectangle2);
var pFeaturefromGeometry3=ee.Feature(pRectangle3);
var pRec1ContainsRec2=pFeaturefromGeometry1.contains(pFeaturefromGeometry2);
print(pRec1ContainsRec2);
var pRec1ContainsRec3=pFeaturefromGeometry1.contains(pFeaturefromGeometry3);
print(pRec1ContainsRec3);
Map.addLayer(pFeaturefromGeometry1, {'color': COLOR.RED});
Map.addLayer(pFeaturefromGeometry2, {'color': COLOR.BLACK});
Map.addLayer(pFeaturefromGeometry3, {'color': COLOR.GREEN});
Map.setCenter(-107.49, 36.04, 8);
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8) convexHull(maxError, proj)
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var COLOR = {
BLACK:'000000',
GREEN:'00ff00'
};
var pPolygon = ee.Geometry.Polygon(-107.49, 36.04, -106.49, 36.84, -108.2, 36.9);
var pFeaturefromPolygon=ee.Feature(pPolygon);
var pConvexHullfromPolygon=pFeaturefromPolygon.convexHull();
print(pFeaturefromPolygon);
print(pConvexHullfromPolygon);
Map.addLayer(pFeaturefromPolygon, {'color': COLOR.BLACK});
Map.addLayer(pConvexHullfromPolygon, {'color': COLOR.GREEN});
Map.setCenter(-107.49, 36.04, 8);
9) copyProperties(source, properties, exclude)
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var COLOR = {
RED: 'ff0000',
BLACK:'000000',
GREEN:'00ff00'
};
var pRectangle1 = ee.Geometry.Rectangle(-107.49, 36.04, -106.49, 36.84);
var pRectangle2 = ee.Geometry.Rectangle(-107.19, 36.04, -105.49, 36.84);
var pFeature1=ee.Feature(pRectangle1);
var pFeature2=ee.Feature(pRectangle2);
print(pFeature1);
print(pFeature2);
var pFeature1Modified=ee.Feature(pFeature1).set("high_record",40);
var pFeature2Modified=pFeature2.copyProperties(pFeature1Modified);
print(pFeature1Modified);
print(pFeature2Modified);
Map.addLayer(pFeature1Modified, {'color': COLOR.RED});
Map.addLayer(ee.Feature(pFeature2Modified), {'color': COLOR.BLACK});
Map.setCenter(-107.49, 36.04, 8);
10) cutLines(distances, maxError, proj)
1. var COLOR = {
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RED: 'ff0000',
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BLACK:'000000',
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GREEN:'00ff00'
5. };
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var pLineString = ee.Geometry.LineString(-107.49, 36.04, -106.49, 36.84);
var pFeaturefromGeometry=ee.Feature(pLineString);
print(pFeaturefromGeometry);
var pLength=pFeaturefromGeometry.length();
print(pLength);//126171.93754653326
var pCutLines=pLineString.cutLines([pLength.multiply(0.5)]);
print(pCutLines);
print(pCutLines.length());
print(pCutLines.geometries());
print(pCutLines.geometries().get(0));
print(pCutLines.geometries().get(1));
Map.addLayer(pFeaturefromGeometry, {'color': COLOR.RED});
Map.addLayer(pCutLines, {'color': COLOR.BLACK});
Map.setCenter(-107.49, 36.04, 8);
11) difference(right, maxError, proj)
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var COLOR = {
RED: 'ff0000',
BLACK:'000000',
GREEN:'00ff00'
};
var pRectangle1 = ee.Geometry.Rectangle(-107.49, 36.04, -106.49, 36.84);
var pRectangle2 = ee.Geometry.Rectangle(-107.19, 36.04, -105.49, 36.84);
var pFeaturefromGeometry1=ee.Feature(pRectangle1);
var pFeaturefromGeometry2=ee.Feature(pRectangle2);
var pDifference=pFeaturefromGeometry1.difference(pFeaturefromGeometry2);
print(pDifference);
Map.addLayer(pFeaturefromGeometry1, {'color': COLOR.RED});
Map.addLayer(pFeaturefromGeometry2, {'color': COLOR.BLACK});
Map.addLayer(pDifference, {'color': COLOR.GREEN});
Map.setCenter(-107.49, 36.04, 8);
12) disjoint(right, maxError, proj)
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var COLOR = {
RED: 'ff0000',
BLACK:'000000',
GREEN:'00ff00'
};
var pRectangle1 = ee.Geometry.Rectangle(-107.49, 36.04, -106.49, 36.84);
var pRectangle2 = ee.Geometry.Rectangle(-106.19, 36.04, -105.49, 36.84);
var pRectangle3 = ee.Geometry.Rectangle(-107.19, 36.04, -105.49, 36.84);
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var pFeaturefromGeometry1=ee.Feature(pRectangle1);
var pFeaturefromGeometry2=ee.Feature(pRectangle2);
var pFeaturefromGeometry3=ee.Feature(pRectangle3);
var p1Disjoint2=pFeaturefromGeometry1.disjoint(pFeaturefromGeometry2);
var p1Disjoint3=pFeaturefromGeometry1.disjoint(pFeaturefromGeometry3);
print(p1Disjoint2);
print(p1Disjoint3);
Map.addLayer(pFeaturefromGeometry1, {'color': COLOR.RED});
Map.addLayer(pFeaturefromGeometry2, {'color': COLOR.BLACK});
Map.addLayer(pFeaturefromGeometry3, {'color': COLOR.GREEN});
Map.setCenter(-107.49, 36.04, 8);
13) dissolve(maxError, proj)
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var COLOR = {
RED: 'ff0000',
BLACK:'000000',
GREEN:'00ff00'
};
var pLineString = ee.Geometry.LineString(-107.49, 36.04, -106.49, 36.84);
var pFeaturefromGeometry=ee.Feature(pLineString);
var pLength=pFeaturefromGeometry.length();
var pCutLines=pLineString.cutLines([pLength.multiply(0.5)]);
var pDissolvedGeometries=pCutLines.dissolve();
print(pCutLines);
print(pDissolvedGeometries);
Map.addLayer(pFeaturefromGeometry, {'color': COLOR.RED});
Map.addLayer(pCutLines, {'color': COLOR.BLACK});
Map.addLayer(pDissolvedGeometries, {'color': COLOR.GREEN});
Map.setCenter(-107.49, 36.04, 8);
14) distance(right, maxError, proj)
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var COLOR = {
RED: 'ff0000',
BLACK:'000000',
GREEN:'00ff00'
};
var pRectangle1 = ee.Geometry.Rectangle(-107.49, 36.04, -106.49, 36.84);
var pRectangle2 = ee.Geometry.Rectangle(-106.19, 36.04, -105.49, 36.84);
var pRectangle3 = ee.Geometry.Rectangle(-107.19, 36.04, -105.49, 36.84);
var pFeaturefromGeometry1=ee.Feature(pRectangle1);
var pFeaturefromGeometry2=ee.Feature(pRectangle2);
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var pFeaturefromGeometry3=ee.Feature(pRectangle3);
var pDistance1to2=pFeaturefromGeometry1.distance(pFeaturefromGeometry2);
var pDistance1to3=pFeaturefromGeometry1.distance(pFeaturefromGeometry3);
print(pDistance1to2);
print(pDistance1to3);
Map.addLayer(pFeaturefromGeometry1, {'color': COLOR.RED});
Map.addLayer(pFeaturefromGeometry2, {'color': COLOR.BLACK});
Map.addLayer(pFeaturefromGeometry3, {'color': COLOR.GREEN});
Map.setCenter(-107.49, 36.04, 8);
15) get(property)
1. var statesData = ee.FeatureCollection('ft:1dZ78QI6P_HrZ6oabSKitytOhWM__fI9O1ayP4AoI');
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print(statesData);
Map.addLayer(statesData);
var filteredRecord=statesData.filter(ee.Filter.gt("high_record", 51.4));
print(filteredRecord);
if(filteredRecord!=null){
print(ee.Feature(filteredRecord.first()).get("high_record"));
}
16) getInfo(callback)
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var statesData = ee.FeatureCollection('ft:1dZ78QI6P_HrZ6oabSKitytOhWM__fI9O1ayP4AoI');
//Not Ajaxified
print(ee.Feature(statesData.first()).getInfo());
print(ee.Feature(statesData.first()).getInfo().properties);
print(ee.Feature(statesData.first()).getInfo().properties.low_record);
print(ee.Feature(statesData.first()).getInfo().id);
print(ee.Feature(statesData.first()).getInfo().type);
print(ee.Feature(statesData.first()).getInfo().geometry);
print(ee.Feature(statesData.first()).getInfo().geometry.coordinates);
print(ee.Feature(statesData.first()).getInfo().geometry.coordinates[0]);
17) getMap(visParams, callback)
1. var statesData = ee.FeatureCollection('ft:1dZ78QI6P_HrZ6oabSKitytOhWM__fI9O1ayP4AoI');
2. var firstRecord=ee.Feature(statesData.first());
3.
4. print(firstRecord.getMap());
5. print(firstRecord.getMap().mapid);
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6. print(firstRecord.getMap().token);
7. print(firstRecord.getMap().image);
18) id()
1. var statesData = ee.FeatureCollection('ft:1dZ78QI6P_HrZ6oabSKitytOhWM__fI9O1ayP4AoI');
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print(statesData);
Map.addLayer(statesData);
var filteredRecord=statesData.filter(ee.Filter.gt("high_record", 44.4));
if (filteredRecord!= null){
var firstRecord=filteredRecord.first();
var firstRecordID=ee.Feature(firstRecord).id();
print(firstRecord);
print(firstRecordID);
}
19) intersection (right, maxError, proj)
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var COLOR = {
RED: 'ff0000',
BLACK:'000000',
GREEN:'00ff00'
};
var pRectangle1 = ee.Geometry.Rectangle(-107.49, 36.04, -106.49, 36.84);
var pRectangle2 = ee.Geometry.Rectangle(-106.99, 36.04, -105.49, 36.84);
var pFeaturefromGeometry1=ee.Feature(pRectangle1);
var pFeaturefromGeometry2=ee.Feature(pRectangle2);
var pIntersectedRegion=pFeaturefromGeometry1.intersection(pFeaturefromGeometry2);
print(pIntersectedRegion);
Map.addLayer(pFeaturefromGeometry1, {'color': COLOR.RED});
Map.addLayer(pFeaturefromGeometry2, {'color': COLOR.BLACK});
Map.addLayer(pIntersectedRegion, {'color': COLOR.GREEN});
Map.setCenter(-107.49, 36.04, 8);
20) intersects(right, maxError, proj)
1. var COLOR = {
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RED: 'ff0000',
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BLACK:'000000',
4.
GREEN:'00ff00'
5. };
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var pRectangle1 = ee.Geometry.Rectangle(-107.49, 36.04, -106.49, 36.84);
var pRectangle2 = ee.Geometry.Rectangle(-106.19, 36.04, -105.49, 36.84);
var pFeaturefromGeometry1=ee.Feature(pRectangle1);
var pFeaturefromGeometry2=ee.Feature(pRectangle2);
var pIntersects=pFeaturefromGeometry1.intersects(pFeaturefromGeometry2);
print(pIntersects);
Map.addLayer(pFeaturefromGeometry1, {'color': COLOR.RED});
Map.addLayer(pFeaturefromGeometry2, {'color': COLOR.BLACK});
Map.setCenter(-107.49, 36.04, 8);
21) length (maxError, proj)
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var COLOR = {
RED: 'ff0000',
BLACK:'000000',
BLUE:'0000ff',
GREEN:'00ff00'
};
var pLineString = ee.Geometry.LineString(-107.49, 36.04, -106.49, 36.84);
var pFeaturefromLineString=ee.Feature(pLineString);
var pLengthLineString=pFeaturefromLineString.length();
var pCutLines=pFeaturefromLineString.cutLines([pLengthLineString.multiply(0.5)]);
var pLengthMultiLineString=pCutLines.length();
var pRectangle = ee.Geometry.Rectangle(-107.49, 36.04, -106.49, 36.84);
var pFeaturefromRectangle=ee.Feature(pRectangle);
var pLengthRectangle=pFeaturefromRectangle.length();
var pLinearRing = ee.Geometry.LinearRing(-107.49, 36.04, -106.49, 36.84, 107.1, 36.5);
20. var pFeaturefromLinearRing=ee.Feature(pLinearRing);
21. var pLengthLinearRing=pFeaturefromLinearRing.length();
22.
23. print(pLengthLineString);
24. print(pLengthMultiLineString);
25. print(pLengthRectangle);
26. print(pLengthLinearRing);
27.
28.
29. Map.addLayer(pFeaturefromLineString, {'color': COLOR.RED});
30. Map.addLayer(pCutLines, {'color': COLOR.BLACK});
31. Map.addLayer(pFeaturefromRectangle, {'color': COLOR.BLUE});
32. Map.addLayer(pFeaturefromLinearRing, {'color': COLOR.GREEN});
33.
34. Map.setCenter(-107.49, 36.04, 8);
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22) perimeter(maxError, proj)
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var COLOR = {
RED: 'ff0000',
BLACK:'000000'
};
var pRectangle1 = ee.Geometry.Rectangle(-107.49, 36.04, -106.49, 36.84);
var pRectangle2 = ee.Geometry.Rectangle(-106.49, 36.04, -105.49, 36.84);
var pFeaturefromGeometry1=ee.Feature(pRectangle1);
var pFeaturefromGeometry2=ee.Feature(pRectangle2);
//Coordinate system
var perimeterGeometry1=pFeaturefromGeometry1.perimeter();
var perimeterGeometry2=pFeaturefromGeometry2.perimeter();
print(perimeterGeometry1);
print(perimeterGeometry2);
Map.addLayer(pFeaturefromGeometry1, {'color': COLOR.RED});
Map.addLayer(pFeaturefromGeometry2, {'color': COLOR.BLACK});
Map.setCenter(-107.49, 36.04, 8);
23) propertyNames()
1. var statesData = ee.FeatureCollection('ft:1dZ78QI6P_HrZ6oabSKitytOhWM__fI9O1ayP4AoI');
2. var pFeaturesPropertyList=ee.Feature(statesData.first()).propertyNames();
3.
4. print(pFeaturesPropertyList);
5. print(pFeaturesPropertyList.get(2));
24) select(propertySelectors, newProperties, retainGeometry)
1. var statesData = ee.FeatureCollection('ft:1dZ78QI6P_HrZ6oabSKitytOhWM__fI9O1ayP4AoI');
2. var filteredRecord=statesData.filter(ee.Filter.gt("high_record", 44.4));
3.
4. if(filteredRecord!= null){
5.
var firstRecord=filteredRecord.first();
6.
var pFeaturefromComputedObject=ee.Feature(firstRecord);
7.
var pElementwithSelected=pFeaturefromComputedObject.select(["high_record", "low_recor
d"], ["high", "low"]);
8.
var pFeaturewithSelected=ee.Feature(pElementwithSelected);
9.
10. print(pFeaturefromComputedObject);
11. print(pFeaturewithSelected);
12. }
12
25) set(var_args)
1. var statesData = ee.FeatureCollection('ft:1dZ78QI6P_HrZ6oabSKitytOhWM__fI9O1ayP4AoI');
2. var filteredRecord=statesData.filter(ee.Filter.gt("high_record", 35));
3.
4. if(filteredRecord!=null)
5. {
6.
var firstRecord=statesData.first();
7.
var modifiedFirstRecord=ee.Feature(firstRecord).set("high_record", ee.Number(ee.Featu
re(firstRecord).get("high_record")).multiply(1.2));
8.
print(firstRecord);
9.
print(modifiedFirstRecord);
10. }
26) setGeometry(geometry)
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
var COLOR = {
BLACK:'000000',
GREEN:'00ff00'
};
var pPolygon = ee.Geometry.Polygon(-107.49, 36.04, -106.49, 36.84, -108.2, 36.9);
var pRectangle = ee.Geometry.Rectangle(-107.49, 36.04, -106.49, 36.84);
var pFeaturefromPolygon=ee.Feature(pPolygon);
var pFeaturefromRectangle=ee.Feature(pRectangle);
var pPolygonwithAttributes=pFeaturefromPolygon.set("high_record", 40);
var pRectanglewithAttributes=pPolygonwithAttributes.setGeometry(pRectangle);
print(pFeaturefromPolygon);
print(pFeaturefromRectangle);
print(pPolygonwithAttributes);
print(pRectanglewithAttributes);
Map.addLayer(pPolygonwithAttributes, {'color': COLOR.BLACK});
Map.addLayer(ee.Feature(pRectanglewithAttributes), {'color': COLOR.GREEN});
Map.setCenter(-107.49, 36.04, 8);
27) setMulti(properties)
1. var pPolygon = ee.Geometry.Polygon(-107.49, 36.04, -106.49, 36.84, -108.2, 36.9);
2. var pFeaturefromGeometry=ee.Feature(pPolygon);
3. var pFeaturewithAttributes=pFeaturefromGeometry.setMulti({high_record:35, low_record:40});
4.
5. print(pFeaturefromGeometry);
6. print(pFeaturewithAttributes);
13
28) simplify(maxError, proj)
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
var COLOR = {
RED: 'ff0000',
BLACK:'000000'
};
var pLineString1 = ee.Geometry.LineString(-107.49, 36.04, -106.49, 36.84);
var pLineString2 = ee.Geometry.LineString(-106.49, 36.84, -102.49, 36.14);
var pLineString3 = ee.Geometry.LineString(-102.49, 36.14, -99.49, 36.94);
var pLineString4 = ee.Geometry.LineString(-99.49, 36.94, -106.49, 36.14);
var pMultiLineString=ee.Geometry.MultiLineString([pLineString1, pLineString2, pLineStri
ng3, pLineString4]);
var pFeaturefromMultiLineString=ee.Feature(pMultiLineString);
var pSimplifiedMultiLineString=pFeaturefromMultiLineString.simplify(0.00001);
print(pFeaturefromMultiLineString);
print(pSimplifiedMultiLineString);
Map.addLayer(pFeaturefromMultiLineString, {'color': COLOR.BLACK});
Map.addLayer(pSimplifiedMultiLineString, {'color': COLOR.RED});
Map.setCenter(-107.49, 36.04, 8);
29) symmetricDifference(right, maxError, proj)
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
var COLOR = {
RED: 'ff0000',
BLACK:'000000',
GREEN:'00ff00',
BLUE:'0000ff',
PINK:'FFC0CB'
};
var pRectangle1 = ee.Geometry.Rectangle(-107.49, 36.04, -106.49, 36.84);
var pRectangle2 = ee.Geometry.Rectangle(-107.19, 36.24, -106.79, 36.64);
var pFeaturefromGeometry1=ee.Feature(pRectangle1);
var pFeaturefromGeometry2=ee.Feature(pRectangle2);
var pSymmetricDifference=pFeaturefromGeometry2.symmetricDifference(pFeaturefromGeometry
1);
16. var pDifference1from2=pFeaturefromGeometry2.difference(pFeaturefromGeometry1);
17. var pDifference2from1=pFeaturefromGeometry1.difference(pFeaturefromGeometry2);
18.
19. print(pSymmetricDifference);
20. print(pDifference1from2);
21. print(pDifference2from1);
22.
23. Map.addLayer(pFeaturefromGeometry1, {'color': COLOR.RED});
24. Map.addLayer(pFeaturefromGeometry2, {'color': COLOR.BLACK});
25. Map.addLayer(pSymmetricDifference, {'color': COLOR.GREEN});
26. Map.addLayer(pDifference1from2, {'color': COLOR.BLUE});
14
27. Map.addLayer(pDifference2from1, {'color': COLOR.PINK});
28.
29.
30. Map.setCenter(-107.49, 36.04, 8);
30) toArray(properties)
1. var statesData = ee.FeatureCollection('ft:1dZ78QI6P_HrZ6oabSKitytOhWM__fI9O1ayP4AoI');
2. var filteredRecord=statesData.filter(ee.Filter.gt("high_record", 44.4));
3.
4. if(filteredRecord!= null){
5.
var firstRecord=filteredRecord.first();
6.
var pFeaturefromComputedObject=ee.Feature(firstRecord);
7.
var pFeatureArray=pFeaturefromComputedObject.toArray(["high_record", "low_record"])
8.
9.
print(pFeaturefromComputedObject);
10. print(pFeatureArray);
11. print(pFeatureArray.get([0]));
12. print(pFeatureArray.get([1]));
13.
14. }
31) toDictionary(properties)
1. var statesData = ee.FeatureCollection('ft:1dZ78QI6P_HrZ6oabSKitytOhWM__fI9O1ayP4AoI');
2. var filteredRecord=statesData.filter(ee.Filter.gt("high_record", 44.4));
3.
4. if(filteredRecord!= null){
5.
var firstRecord=filteredRecord.first();
6.
var pFeaturefromComputedObject=ee.Feature(firstRecord);
7.
var pFeatureDictionary=pFeaturefromComputedObject.toDictionary(["high_record", "low_r
ecord"])
8.
9.
print(pFeaturefromComputedObject);
10. print(pFeatureDictionary);
11. print(pFeatureDictionary.keys());
12. print(pFeatureDictionary.values());
13. print(pFeatureDictionary.get("high_record"));
14. }
32) transform(proj, maxError)
1.
var COLOR = {
2.
BLACK:'000000',
3.
GREEN:'00ff00'
4. };
5.
6. var pPolygon = ee.Geometry.Polygon(-107.49, 36.04, -106.49, 36.84, -108.2, 36.9);
7. var pFeaturefromPolygon=ee.Feature(pPolygon);
15
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
var PTransformedPolygon=pFeaturefromPolygon.transform("EPSG:2152", 0.00001);
print(pPolygon.projection());
print(pPolygon.projection().crs());
print(ee.FeatureCollection([PTransformedPolygon]).geometry().projection().crs());
print(ee.FeatureCollection([PTransformedPolygon]).geometry().projection().wkt());
Map.addLayer(pFeaturefromPolygon, {'color': COLOR.GREEN});
Map.addLayer(PTransformedPolygon, {'color': COLOR.BLACK});
Map.setCenter(-107.49, 36.04, 8);
33) union(right, maxError, proj)
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
var COLOR = {
RED: 'ff0000',
BLACK:'000000',
GREEN:'00ff00'
};
var pRectangle1 = ee.Geometry.Rectangle(-107.49, 36.04, -106.49, 36.84);
var pRectangle2 = ee.Geometry.Rectangle(-106.49, 36.04, -105.49, 36.84);
var pFeaturefromGeometry1=ee.Feature(pRectangle1);
var pFeaturefromGeometry2=ee.Feature(pRectangle2);
var pUnion=pFeaturefromGeometry1.union(pFeaturefromGeometry2);
print(pUnion);
Map.addLayer(pFeaturefromGeometry1, {'color': COLOR.RED});
Map.addLayer(pFeaturefromGeometry2, {'color': COLOR.BLACK});
Map.addLayer(pUnion, {'color': COLOR.GREEN});
Map.setCenter(-107.49, 36.04, 8);
34) withinDistance(right, distance, maxError, proj)
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
var COLOR = {
RED: 'ff0000',
BLACK:'000000',
GREEN:'00ff00'
};
var pRectangle1 = ee.Geometry.Rectangle(-107.49, 36.04, -106.49, 36.84);
var pRectangle2 = ee.Geometry.Rectangle(-106.19, 36.04, -105.49, 36.84);
var pFeaturefromGeometry1=ee.Feature(pRectangle1);
var pFeaturefromGeometry2=ee.Feature(pRectangle2);
//The actual distance between the features is 26759.334062457332
var pWithInDistance1to2=pFeaturefromGeometry1.withinDistance(pFeaturefromGeometry2, 267
59.234062457332);
15.
16
16.
17.
18.
19.
20.
21.
print(pWithInDistance1to2);
Map.addLayer(pFeaturefromGeometry1, {'color': COLOR.RED});
Map.addLayer(pFeaturefromGeometry2, {'color': COLOR.BLACK});
Map.setCenter(-107.49, 36.04, 8);
References
Google Earth Engine Team, 2015. Google Earth Engine: A planetary-scale geospatial analysis platform.
https://earthengine.google.com
17
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