ESA SNAP 9 docker images

Docker images of ESA Sentinel Application Platform (SNAP) from http://step.esa.int/main/toolboxes/snap/

The related docker images are created and available for download from here:

https://hub.docker.com/r/mundialis/esa-snap

Tag	Description	GitHub branch	Base image	Size	docker pull command
s1tbx	Only s1tbx toolbox	s1tbx	Alpine 3.18 based	1.4 GB	docker pull mundialis/esa-snap:s1tbx
latest	Only s1tbx toolbox	s1tbx	Alpine 3.18 based	1.4 GB	docker pull mundialis/esa-snap:latest
ubuntu	All SNAP toolboxes	ubuntu	Ubuntu 18.04 based	2 GB	docker pull mundialis/esa-snap:ubuntu

Installation

Pull the Alpine Linux based image (only SNAP Sentinel-1 toolbox):

docker pull mundialis/esa-snap:latest

Tutorial

We recommend the following tutorial:

http://step.esa.int/docs/tutorials/SNAP_CommandLine_Tutorial.pdf

Usage examples

SNAP Graphical User Interface - GUI

Using the GUI, among other functionality the GraphBuilder is available.

Start of GUI, with volume mapping of current directory (pwd; may be set to a different directory) to /data/ within docker:

docker run -it --rm --volume="$(pwd)/:/data" \
    --volume="/tmp/.X11-unix:/tmp/.X11-unix:rw" \
    --env DISPLAY=$DISPLAY --device="/dev/dri/card0:/dev/dri/card0" \
    mundialis/esa-snap:latest \
    /usr/local/snap/bin/snap

SNAP Graph Processing Tool - command line

Using the SNAP Graph Processing Tool (GPT):

# show help of gpt tool
docker run -it --rm mundialis/esa-snap:latest /usr/local/snap/bin/gpt -h

One can pass the required processing settings in an XML-encoded graph file which is passing this graph as parameter to the gpt tool:

docker run -it --rm mundialis/esa-snap:latest /usr/local/snap/bin/gpt <GraphFile.xml> [options] [<source-file-1> <source-file-2> ...]

For further gpt usage please refer to the official documentation.

Background info

This docker image is based on Alpine Linux and only contains the s1tbx toolbox. Furthermore,

• the original installer provided by ESA ships its own oracle java
• Alpine is based on musl libc and busybox. As Oracle JAVA depends on glibc, it doesn't work smoothly. With https://github.com/sgerrand/alpine-pkg-glibc this can be workarounded to a certain way but in our case not sufficient (conflicting dependencies).
• From SNAP Version 8, oracle java > 8 and openjdk in general will be supported officially (https://forum.step.esa.int/t/problems-running-tests-in-intellij/9350/8)

Where is the Ubuntu based docker image?

Find the Ubuntu based docker image related files in branch ubuntu (see here). See there for related instructions.

Alpine dev stuff

Alternatively, a build approach was tried out. Kept here if needed further. As the stable SNAP version 7.0.2 needs maven 3.6.0 (while alpine offers 3.6.3), so SNAP 8 was built for testing.

FROM alpine:edge

<!-- ARG SNAP_ENGINE_TAG=8.0.0 -->
ENV JAVA_HOME "/usr/lib/jvm/java-1.8-openjdk"

RUN apk add git openjdk8 maven
RUN git clone https://github.com/senbox-org/snap-engine.git /src/snap/snap-engine
WORKDIR /src/snap/snap-engine
<!-- RUN git checkout $SNAP_ENGINE_TAG -->
RUN sed -i 's+<module>snap-classification</module>+<!--<module>snap-classification</module>-->+g' pom.xml
RUN mvn clean install -DskipTests

WORKDIR /src/snap/s1tbx
git clone https://github.com/senbox-org/s1tbx.git /src/snap/s1tbx
cd s1tbx
mvn clean install

WORKDIR /src/snap/snap-enginge
java -cp snap-runtime/target/snap-runtime.jar org.esa.snap.runtime.BundleCreator ../snap.zip "/src/snap/snap-engine" "/src/snap/s1tbx"