Using GeoScript Groovy

1. Using GeoScript
Groovy
Jared Erickson
CUGOS February 2014

2. What is GeoScript?
• Geospatial Swiss Army Knife
• One scripting API Many Languages

3. What is Groovy?
• Yes, there is a language called Groovy
• Dynamic JVM Language
• Strong Java Integration
• Closures, MetaProgramming, Scripting

4. Uses
• Scripts
• Shell
• Console
• GeoServer
• uDig
• Apps (GeoScript as a Library)

5. How do I install it?
• Install Java
• Install Groovy
• Download GeoScript Groovy and put the
bin directory on your path
• https://github.com/jericks/geoscript-groovy/
releases

6. How do I learn it?
http://geoscript.org
http://geoscript.org/groovy/api/

7. Command line tools
geoscript-groovy = run scripts
geoscript-groovysh = interactive shell
geoscript-groovyConsole = mini ide
!

8. Inline Scripts
(geoscript-groovy)
geoscript-groovy -e "println new
geoscript.layer.Shapefile('states.shp').toJSONString()" |
mapfart
!
geoscript-groovy -e "println new
geoscript.layer.Shapefile('states.shp').bounds.geometry"
!
geoscript-groovy -e "println new
geoscript.layer.Shapefile('states.shp').count"

9. Inline Scripts
(geoscript-groovy)
geoscript-groovy -e "geoscript.render.Draw.draw(new
geoscript.layer.Shapefile('states.shp'), out: 'image.png')"
!
geoscript-groovy -e "new
geoscript.layer.Shapefile('states.shp').eachFeature{ println
it.geom.centroid}" | geom combine | geom buffer -d 1.5
!
echo "POINT (1 1)" | geom buffer -d 10 | geoscriptgroovy -e "println
geoscript.geom.Geometry.fromWKT(System.in.text).kml"

10. Inline Scripts
(geoscript-groovy)
• One liners
• Interact with other command line tools
• geom, mapfart, ogr, ect…
• Read Standard Input (System.in.text)
• Write to Standard Output (println)

11. Scripts
web.groovy
(geoscript-groovy)
1 import com.sun.grizzly.http.embed.GrizzlyWebServer!
2 import com.sun.grizzly.http.servlet.ServletAdapter!
3 !
4 @Grab(group='com.sun.grizzly', module='grizzly-servlet-webserver',
version='1.9.10')!
5 def start() {!
6
println("Starting web server...")!
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def server = new GrizzlyWebServer(8080, "web")!
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def servlet = new ServletAdapter()!
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servlet.contextPath = "/geoscript"!
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servlet.servletInstance = new groovy.servlet.GroovyServlet()!
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server.addGrizzlyAdapter(servlet, ["/geoscript"] as String[])!
12
server.start()!
13 }!
14 start()

12. Scripts
(geoscript-groovy)
web/buffer.groovy
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import geoscript.geom.*!
!
def geom = Geometry.fromWKT(request.getParameter("geom"))!
def distance = request.getParameter("d") as double!
println(geom.buffer(distance).wkt)
web/draw.groovy
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import geoscript.geom.*!
import geoscript.viewer.Viewer!
!
def geom = Geometry.fromWKT(request.getParameter("geom"))!
def image = Viewer.drawToImage(geom, size: [400, 400])!
response.contentType = "image/png"!
javax.imageio.ImageIO.write(image, "png", response.outputStream)

13. Scripts
(groovy)
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@GrabResolver(name="opengeo", root="http://repo.opengeo.org")!
@Grab("org.geoscript:geoscript-groovy:1.1")!
import geoscript.geom.Point!
!
p = new Point(1,1)!
println p.geoJSON!
• Use GeoScript without installing GeoScript
• Just need Java and Groovy
• @GrabResolver and @Grab can download
dependencies

14. Scripts
(geoscript-groovy)
• Larger multiline scripts
• Good for complex processing
• Record your workflow
• Can create command line tools, web
services, or desktop apps
• Use @Grab to get dependencies

15. Shell
(geoscript-groovysh)
Groovy Shell (2.1.9, JVM: 1.7.0_45)
Type 'help' or 'h' for help.
-------------------------------------------------------------------------------
groovy:000> import geoscript.workspace.PostGIS
===> [import geoscript.workspace.PostGIS]
groovy:000> postgis = new PostGIS("states",user: "jericks")
===> geoscript.workspace.PostGIS@7840df80
groovy:000> postgis.layers
===> [states]
groovy:000> states = postgis.get("states")
===> states
groovy:000> states.bounds
===> (-124.731422,24.955967,-66.969849,49.371735,EPSG:4326)
groovy:000> states.count
===> 49
groovy:000> states.eachFeature{ println it.geom.centroid }
POINT (-89.20368628698026 40.06397152717181)
POINT (-77.01592888814594 38.90248929357207)
POINT (-75.50090936853277 38.994999876971384)
POINT (-80.61424804312078 38.64111336139042)

16. Shell
(geoscript-groovysh)
groovy:000> states.schema.fields
===> [the_geom: MultiPolygon(EPSG:4326), STATE_NAME: String, STATE_FIPS: String,
SUB_REGION: String, STATE_ABBR: String, LAND_KM: Double, WATER_KM: Double, PERSONS:
Double, FAMILIES: Double, HOUSHOLD: Double, MALE: Double, FEMALE: Double, WORKERS:
Double, DRVALONE: Double, CARPOOL: Double, PUBTRANS: Double, EMPLOYED: Double,
UNEMPLOY: Double, SERVICE: Double, MANUAL: Double, P_MALE: Double, P_FEMALE: Double,
SAMP_POP: Double]
groovy:000> state_centroids = states.transform("state_centroids", [the_geom:
"centroid(the_geom)", name: "STATE_NAME", abbreviation: "STATE_ABBR"])
===> state_centroids
groovy:000> state_centroids.count
===> 49
groovy:000> postgis
===> geoscript.workspace.PostGIS@7840df80
groovy:000> postgis.add(state_centroids)
===> state_centroids
groovy:000> postgis.names
===> [state_centroids, states]
groovy:000> postgis["state_centroids"].schema
===> state_centroids the_geom: Point(EPSG:4326), name: String, abbreviation: String

17. Shell
(geoscript-groovysh)
• Good for trying things out
• Interact and explore all things geospatial

18. Console
(geoscript-groovyConsole)

19. Console
(geoscript-groovyConsole)

20. Console
geoscript-groovyConsole

21. Console
• Good for longer scripts (but not too long)
• Excellent preview (View -> Visualize Script
Results)
• Use it when rendering images, maps,
geometries

22. uDig

23. uDig
•
•
•
Done by Andrea Antonello and the UDig crew
•
http://prezi.com/wyopic4sinhg/geographic-scripting-inudig-user-friendly-desktop-internet-gis/
Part of the Spatial Toolbox
http://udig.github.io/docs/user/getting_started/GeoScript
%20Introduction.html
• http://www.slideshare.net/moovida/04-geographic-
scripting-in-udig-halfway-between-user-and-developer

24. GeoServer
• Web services
• Web Processing Services (WPS)
• Filter Functions (used in SLDs for styling your maps)
• Download groovy plugin from http://
ares.opengeo.org/geoserver/2.4.x/community-latest/
• Extract jars to geoserver/WEB-INF/lib
• http://www.slideshare.net/JaredErickson/scriptinggeoserver

25. GeoServer
$DATA_DIR/scripts/wps/buffer.groovy
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import geoscript.geom.Geometry!
!
title = 'Buffer'!
description = 'Buffers a geometry'!
!
inputs = [!
geom: [name: 'geom', title: 'The geometry to buffer', type: Geometry.class],!
distance: [name: 'distance', title: 'The buffer distance', type: Double.class]!
]!
!
outputs = [!
result: [name: 'result', title: 'The buffered geometry', type: Geometry.class]!
]!
!
def run(input) {!
[result: input.geom.buffer(input.distance as double)]!
}!

26. GeoServer

27. As a library
Geoscript is just another jar
<repositories>!
<repository>!
<id>opengeo</id>!
<name>OpenGeo Maven Repository</name>!
<url>http://repo.opengeo.org</url>!
<snapshots>!
<enabled>true</enabled>!
</snapshots>!
</repository>!
</repositories>
<dependency>!
<groupId>org.geoscript</groupId>!
<artifactId>geoscript-groovy</artifactId>!
<version>1.2</version>!
</dependency>

28. Gradle - App
$ mkdir geo-gradle
$ cd geo-gradle/
$ touch build.gradle
$ vi build.gradle
$ mkdir -p src/main/groovy/org/jce/geo
$ touch src/main/groovy/org/jce/geo/App.groovy
$ vi src/main/groovy/org/jce/geo/App.groovy
$ gradle build

29. Gradle - build.gradle
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apply plugin: "groovy"!
apply plugin: "application"!
!
version = 0.1!
mainClassName = "org.jce.geo.App"!
!
repositories {!
maven {!
url "http://repo.opengeo.org"!
}!
maven {!
url "http://download.osgeo.org/webdav/geotools/"!
}!
mavenCentral()!
}!
!
dependencies {!
compile "org.codehaus.groovy:groovy-all:2.1.9"!
compile "org.geoscript:geoscript-groovy:1.2"!
}

30. Gradle - Code
src/main/groovy/org/jce/geo/App.groovy
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package org.jce.geo!
!
import geoscript.geom.Geometry!
import geoscript.proj.Projection!
!
class App {!
static void main(String[] args) {!
Geometry geom = Geometry.fromString(args[0])!
Projection fromProj = new Projection(args[1])!
Projection toProj = new Projection(args[2])!
Geometry transformedGeom = fromProj.transform(geom, toProj)!
println transformedGeom.wkt!
}!
}

31. Using GeoScript Groovy
Functionality
• Geometry
• Projection
• Layer
• Raster
• Style
• Render
Usages
• Scripts
• Shell
• Console
• GeoServer
• uDig
• Apps

32. Thank you!