AI-generated Key Takeaways
-
This tutorial demonstrates how to combine two
ee.FeatureCollections into a newee.FeatureCollection. -
The process involves creating two distinct
ee.FeatureCollectionobjects, merging them, and then visualizing the results on a map. -
The example uses random points within the boundary of Utah to illustrate the combination of feature collections.
ee.FeatureCollection
s into
a new ee.FeatureCollection
. Create two ee.FeatureCollection
objects
Let's begin by generating two sets of random points within the boundary of Utah state in the USA. First, define the boundary of Utah as a geometry.
var
utahGeometry
=
ee
.
Geometry
.
Polygon
([
[
-
114.05
,
37
],
[
-
109.05
,
37
],
[
-
109.05
,
41
],
[
-
111.05
,
41
],
[
-
111.05
,
42
],
[
-
114.05
,
42
]
]);
Then, generate two sets of different random points containing 25 points each. We ensure that the points are different by using a different seed, namely 12 and 1, to generate each set.
var
newFeatures
=
ee
.
FeatureCollection
.
randomPoints
(
utahGeometry
,
25
,
12
);
var
moreNewFeatures
=
ee
.
FeatureCollection
.
randomPoints
(
utahGeometry
,
25
,
1
);
Combine the ee.FeatureCollection
objects
Next, create a new ee.FeatureCollection
by merging newFeatures
and moreNewFeatures
.
var
combinedFeatureCollection
=
newFeatures
.
merge
(
moreNewFeatures
);
Visualize the Results
Let's add all the ee.FeatureCollection
s to the map. First, we set the center
of the map to the coordinates defined below and set the zoom level to 6.
Map
.
setCenter
(
-
111.445
,
39.251
,
6
);
Now, we add all the layers, specifying the layer labels as text strings (for
example, 'New Features'
) and colors to display each layer in. We will also
print the results.
Map
.
addLayer
(
newFeatures
,
{},
'New Features'
);
Map
.
addLayer
(
moreNewFeatures
,
{
color
:
'red'
},
'More New Features'
);
Map
.
addLayer
(
combinedFeatureCollection
,
{
color
:
'yellow'
},
'Combined FeatureCollection'
);
print
(
newFeatures
,
moreNewFeatures
,
combinedFeatureCollection
);
Bonus Points
- What happens if you change the zoom level in
Map.setCenterto 3 or to 12? - Try changing the layer label of
'More New Features'to'Red Points'. Run the script again to see if it worked.
