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TODO: Changing / Creating new zoom level (Upsampling / Downsampling) #13

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aklink opened this issue Dec 8, 2017 · 5 comments
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TODO: Changing / Creating new zoom level (Upsampling / Downsampling) #13

aklink opened this issue Dec 8, 2017 · 5 comments
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aklink commented Dec 8, 2017 •
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We need to be able to change resolution / zoom levels if merging (mosaicing or layer stacking) layers with different zoom levels. Current approach selects highest zoom level common to all layers, but it fails if there is no common zoom level.
Also it would be nice to be able to set resolution to a specific value (alos between two zoom levels).

We will try to use ZoomResample for it:

https://github.com/locationtech/geotrellis/blob/master/spark/src/test/scala/geotrellis/spark/resample/ZoomResampleSpec.scala

https://github.com/locationtech/geotrellis/blob/master/spark/src/main/scala/geotrellis/spark/resample/ZoomResample.scala

An other approach is using Regrid:

https://github.com/locationtech/geotrellis/blob/master/spark/src/test/scala/geotrellis/spark/regrid/RegridSpec.scala

https://github.com/locationtech/geotrellis/blob/master/spark/src/main/scala/geotrellis/spark/regrid/Regrid.scala
@aklink aklink self-assigned this Dec 8, 2017
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aklink commented Dec 12, 2017 •
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Pull request #14

Add biggis.landuse.spark.examples ZoomResampleLayer to create specific Zoom Level of Layer

ZoomResampleLayer(layerNameIn: String, zoomIn: String, layerNameOut: String, zoomOut: String)(implicit catalogPath: String, sc: SparkContext)

Usage (external call):
ZoomResampleLayer layerNameIn zoomIn layerNameOut zoomOut /path/to/catalog

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aklink commented Dec 12, 2017

See also Geotrellis Pull Request: locationtech/geotrellis#2511

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aklink commented Jan 18, 2018

For now, issue closed

Uses a wrapper resampleLayerToZoom around geotrellis.spark.resample.ZoomResampleMultibandMethods (not yet in Geotrellis master, pull request pending, using local copy):

  implicit def resampleLayerToZoom(rdd: MultibandTileLayerRDD[SpatialKey], zoomLevelIn: Int, zoomLevelOut: Int)(implicit sc: SparkContext): MultibandTileLayerRDD[SpatialKey] = {
    geotrellis.spark.resample.Implicits.withZoomResampleMultibandMethods(rdd).resampleToZoom(zoomLevelIn, zoomLevelOut)
  }

Combined with Pyramid.up for 'both way' resampling:

    val outputRdd : SpatialMultibandRDD = 
      if(zoomOut > zoomIn) resampleLayerToZoom(inputRdd, zoomIn.toInt, zoomOut.toInt)   // UpSample (DownLevel) using ZoomResample
      else if(zoomOut < zoomIn) Pyramid.up( inputRdd, ZoomedLayoutScheme(inputRdd.metadata.crs), zoomOut.toInt)._2  // DownSample (UpLevel) using Pyramid.up
      else inputRdd

@aklink aklink closed this as completed Jan 18, 2018
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aklink commented Feb 26, 2018

MultibandTile Support added to Geotrellis:
locationtech/geotrellis@3dbcc4f

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aklink commented Feb 26, 2018

see locationtech/geotrellis#2569

aklink added a commit that referenced this issue Feb 27, 2018
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update ZoomResampleLayer example #13
40953b9
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