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72 changes: 72 additions & 0 deletions
72
spark/src/main/scala/geotrellis/spark/buffer/CollectNeighbors.scala
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,72 @@ | ||
| /* | ||
| * Copyright 2016 Azavea | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
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| package geotrellis.spark.buffer | ||
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| import geotrellis.spark._ | ||
| import geotrellis.raster._ | ||
| import geotrellis.raster.crop._ | ||
| import geotrellis.raster.stitch._ | ||
| import geotrellis.util._ | ||
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| import org.apache.spark.rdd._ | ||
| import org.apache.spark.storage.StorageLevel | ||
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| import scala.reflect.ClassTag | ||
| import scala.collection.mutable.ArrayBuffer | ||
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| object CollectNeighbors { | ||
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| /** Collects tile neighbors by slicing the neighboring tiles to the given | ||
| * buffer size | ||
| */ | ||
| def apply[K: SpatialComponent: ClassTag, V](rdd: RDD[(K, V)]): RDD[(K, Map[Direction, (K, V)])] = { | ||
| val neighbored: RDD[(K, (Direction, (K, V)))] = | ||
| rdd | ||
| .flatMap { case (key, value) => | ||
| val SpatialKey(col, row) = key | ||
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| Seq( | ||
| (key, (CenterDirection, (key, value))), | ||
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| (key.setComponent(SpatialKey(col-1, row)), (RightDirection, (key, value))), | ||
| (key.setComponent(SpatialKey(col+1, row)), (LeftDirection, (key, value))), | ||
| (key.setComponent(SpatialKey(col, row-1)), (BottomDirection, (key, value))), | ||
| (key.setComponent(SpatialKey(col, row+1)), (TopDirection, (key, value))), | ||
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| (key.setComponent(SpatialKey(col-1, row-1)), (BottomRightDirection, (key, value))), | ||
| (key.setComponent(SpatialKey(col+1, row-1)), (BottomLeftDirection, (key, value))), | ||
| (key.setComponent(SpatialKey(col-1, row+1)), (TopRightDirection, (key, value))), | ||
| (key.setComponent(SpatialKey(col+1, row+1)), (TopLeftDirection, (key, value))) | ||
| ) | ||
| } | ||
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| val grouped: RDD[(K, Iterable[(Direction, (K, V))])] = | ||
| rdd.partitioner match { | ||
| case Some(partitioner) => neighbored.groupByKey(partitioner) | ||
| case None => neighbored.groupByKey | ||
| } | ||
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| grouped | ||
| .filter { case (_, values) => | ||
| values.find { | ||
| case (CenterDirection, _) => true | ||
| case _ => false | ||
| }.isDefined | ||
| } | ||
| .mapValues(_.toMap) | ||
| } | ||
| } |
30 changes: 30 additions & 0 deletions
30
spark/src/main/scala/geotrellis/spark/buffer/CollectNeighborsMethods.scala
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,30 @@ | ||
| /* | ||
| * Copyright 2016 Azavea | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
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| package geotrellis.spark.buffer | ||
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| import geotrellis.spark._ | ||
| import geotrellis.util.MethodExtensions | ||
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| import org.apache.spark.rdd.RDD | ||
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| import scala.reflect.ClassTag | ||
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| abstract class CollectNeighborsMethods[K: SpatialComponent: ClassTag, V](val self: RDD[(K, V)]) | ||
| extends MethodExtensions[RDD[(K, V)]] { | ||
| def collectNeighbors(): RDD[(K, Map[Direction, (K, V)])] = | ||
| CollectNeighbors(self) | ||
| } |
29 changes: 29 additions & 0 deletions
29
spark/src/main/scala/geotrellis/spark/buffer/Direction.scala
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,29 @@ | ||
| /* | ||
| * Copyright 2016 Azavea | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
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| package geotrellis.spark.buffer | ||
|
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| sealed trait Direction | ||
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| case object CenterDirection extends Direction | ||
| case object TopDirection extends Direction | ||
| case object TopRightDirection extends Direction | ||
| case object RightDirection extends Direction | ||
| case object BottomRightDirection extends Direction | ||
| case object BottomDirection extends Direction | ||
| case object BottomLeftDirection extends Direction | ||
| case object LeftDirection extends Direction | ||
| case object TopLeftDirection extends Direction |
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