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GeoTrellis

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Maven Central Snapshots

GeoTrellis is a Scala library and framework that provides APIs for reading, writing and operating on geospatial raster and vector data. GeoTrellis also provides helpers for these same operations in Spark and for performing MapAlgebra operations on rasters. It is released under the Apache 2 License.

Please visit the project site for more information as well as some interactive demos.

You're also welcome to ask questions and talk to developers (let us know what you're working on!) via Gitter.

Getting Started

GeoTrellis is currently available for Scala 2.12 and 2.13, using Spark 3.3.x.

To get started with SBT, simply add the following to your build.sbt file:

libraryDependencies += "org.locationtech.geotrellis" %% "geotrellis-raster" % "<latest version>"

To grab the latest SNAPSHOT, RC or milestone build, add these resolvers:

// maven central snapshots
resolvers ++= Seq(
  "sonatype-snapshot" at "https://oss.sonatype.org/content/repositories/snapshots/"
)

// or eclipse snapshots
resolvers ++= Seq(
  "eclipse-releases" at "https://repo.eclipse.org/content/groups/releases",
  "eclipse-snapshots" at "https://repo.eclipse.org/content/groups/snapshots"
)

If you are just getting started with GeoTrellis, we recommend familiarizing yourself with the geotrellis-raster package, but it is just one of the many available. The complete list of published GeoTrellis packages includes:

A more complete feature list can be found on the Module Hierarchy page of the GeoTrellis documentation. If you're looking for a specific feature or operation, we suggest searching there or reaching out on Gitter.

For older releases, check the complete list of packages and versions available at locationtech-releases.

Hello Raster

scala> import geotrellis.raster._
import geotrellis.raster._

scala> import geotrellis.raster.render.ascii._
import geotrellis.raster.render.ascii._

scala> import geotrellis.raster.mapalgebra.focal._
import geotrellis.raster.mapalgebra.focal._

scala> val nd = NODATA
nd: Int = -2147483648

scala> val input = Array[Int](
     nd, 7, 1, 1,  3, 5, 9, 8, 2,
      9, 1, 1, 2,  2, 2, 4, 3, 5,
      3, 8, 1, 3,  3, 3, 1, 2, 2,
      2, 4, 7, 1, nd, 1, 8, 4, 3)
input: Array[Int] = Array(-2147483648, 7, 1, 1, 3, 5, 9, 8, 2, 9, 1, 1, 2,
2, 2, 4, 3, 5, 3, 8, 1, 3, 3, 3, 1, 2, 2, 2, 4, 7, 1, -2147483648, 1, 8, 4, 3)

scala> val iat = IntArrayTile(input, 9, 4)  // 9 and 4 here specify columns and rows
iat: geotrellis.raster.IntArrayTile = IntArrayTile([I@278434d0,9,4)

// The renderAscii method is mostly useful when you're working with small tiles
// which can be taken in at a glance.
scala> iat.renderAscii(AsciiArtEncoder.Palette.STIPLED)
res0: String =
∘█  ▚▜██▖
█  ▖▖▖▜▚▜
▚█ ▚▚▚ ▖▖
▖▜█ ∘ █▜▚

scala> val focalNeighborhood = Square(1)  // a 3x3 square neighborhood
focalNeighborhood: geotrellis.raster.op.focal.Square =
 O  O  O
 O  O  O
 O  O  O

scala> val meanTile = iat.focalMean(focalNeighborhood)
meanTile: geotrellis.raster.Tile = DoubleArrayTile([D@7e31c125,9,4)

scala> meanTile.getDouble(0, 0)  // Should equal (1 + 7 + 9) / 3
res1: Double = 5.666666666666667

Documentation

Documentation is available at geotrellis.io/documentation.

Scaladocs for the the master branch are available here.

Further examples and documentation of GeoTrellis use-cases can be found in the docs/ folder.

Contributing

Feedback and contributions to the project, no matter what kind, are always very welcome. A CLA is required for contribution, see Contributing for more information. Please refer to the Scala style guide for formatting patches to the codebase.

Where is our commit history and contributor list prior to Nov 2016?

The entire old history is available in the _old/master branch.

Why?

In November 2016, GeoTrellis moved it's repository from the GeoTrellis GitHub Organization to it's current home in the LocationTech GitHub organization. In the process of moving our repository, we went through an IP review process. Because the Eclipse foundation only reviews a snapshot of the repository, and not all of history, we had to start from a clean master branch.

Unfortunately, we lost our commit and contributor count in the move. These are significant statistics for a repository, and our current counts make us look younger than we are. GeoTrellis has been an open source project since 2011. This is what our contributor and commit count looked like before the move to LocationTech:

Commit and contributor count before LocationTech move

Along with counts, we want to make sure that all the awesome people who contributed to GeoTrellis before the LocationTech move can still be credited on a contributors page. For posterity, I will leave the following contributors page to what it was before the move:

https://github.com/lossyrob/geotrellis-before-locationtech/graphs/contributors

Tie Local History to Old History

You can also tie your local clone's master history to the old history by running

> git fetch origin refs/replace/*:refs/replace/*

if origin points to https://github.com/locationtech/geotrellis. This will allow you to see the old history for commands like git log.