This Data Processing Library Java example shows how to use the HERE Data SDK to build a compiler pipeline that extracts all pedestrian topologies for a particular input catalog.
In this example, the incremental RefTreeCompiler functional pattern is used, since this pattern covers use cases when some input partitions have references to other input partitions that should be resolved to process the subjects fully.
The implemented compiler takes HERE Map Content input data from the road-attributes
and topology-geometry
layer, finds all pedestrian topologies, and produces output
tiles in GeoJSON Format. The output of this compiler is the pedestriansegments
layer GeoJSON
HEREtile format.
For more information about RefTreeCompiler
functional pattern, see the Data Processing Library Developer Guide
.
To run this example, you need two sets of credentials:
- Platform credentials: To get access to the platform data and resources, including HERE Map Content data for your pipeline input.
- Repository credentials: To download HERE Data SDK for Java & Scala libraries and Maven archetypes to your environment.
For more details on how to set up your credentials, see the Identity & Access Management Developer Guide.
For more details on how to verify that your platform credentials are configured correctly, see the Verify Your Credentials tutorial.
In the commands that follow, replace the variable placeholders with the following values:
$CATALOG_ID
is your output catalog's ID.$CATALOG_HRN
is your output catalog'sHRN
(returned by theolp catalog create
command).$PROJECT_HRN
is your project'sHRN
(returned by theolp project create
command).$CATALOG_RIB
is the HRN of the public HERE Map Content catalog in your pipeline configuration (HERE environment.
Note: We recommend that you set values to variables, so that you can easily copy and execute the following commands.
As mentioned above, we will use the public HERE Map Content input catalog, however, we need to create our own output catalog to store the pedestrian topologies generated by the compiler.
To run this compiler locally, use a local output catalog as described below. For more information about local catalogs, see the SDK tutorial about local development and testing and the OLP CLI documentation.
- Use the
olp local catalog create
command to create a local catalog.
olp local catalog create pedestrian-topologies-scala "Pedestrian Topologies Catalog" \
--summary "Pedestrian topologies extracted from HERE Map Content" \
--description "Pedestrian topologies extracted from HERE Map Content"
The local catalog will have the HRN hrn:local:data:::pedestrian-topologies-scala
.
- Use the
olp local catalog layer add
command to add twoversioned
layers to your catalog:
Layer ID | Layer Type | Partitioning | Zoom Level | Content Type | Content Encoding |
---|---|---|---|---|---|
pedestriansegments | Versioned | HEREtile | 14 | application/vnd.geo+json | uncompressed |
state | Versioned | Generic | N.A. | application/octet-stream | uncompressed |
olp local catalog layer add hrn:local:data:::pedestrian-topologies-scala pedestriansegments pedestriansegments --versioned --summary "pedestrian segments" \
--description "pedestrian segments" --partitioning heretile:14 \
--content-type application/vnd.geo+json
olp local catalog layer add hrn:local:data:::pedestrian-topologies-scala state state --versioned --summary "state" \
--description "state" --partitioning Generic \
--content-type application/octet-stream
To build the compiler, run the following command in the pedestrian-topologies-extraction-geojson
directory:
sbt package
To run the compiler locally, you will need to run the entry point to the compiler:
com.here.platform.data.processing.example.java.pedestrian.geojson.Main
As arguments, you must provide the -Dspark.master
parameter with the address of the Spark server
master to connect to, and any configuration parameters you want to override. Alternatively, you
can add those parameters to the application.conf
file.
Additionally, you also need to specify the -Dpipeline-config.file
and -Dpipeline-job.file
parameters
to define the location of a configuration file that contains the catalogs as well as job-specific versions
of the catalogs, to read and write to.
For local runs, a bounding box filter is provided in the
config/here/local-application.conf
to
limit the number of partitions to be processed. This speeds up the compilation process. In this
example, we use a bounding box around the cities of Berlin. You can edit the bounding box coordinates to compile a different
partition of HERE Map Content. Make sure you update the layer coverage to reflect the different
geographical region. In order to use this configuration file, you need to use the -Dconfig.file
parameter.
Set the environment variable $PATH_TO_CONFIG_FOLDER
to ./config/here
.
Finally, execute the following command in the pedestrian-topologies-extraction-geojson
directory
to run the Pedestrian Topologies Compiler.
For the HERE platform environment:
sbt run \
-Dpipeline-config.file=./config/here/local-pipeline-config.conf \
-Dpipeline-job.file=./config/here/pipeline-job.conf \
-Dconfig.file=./config/here/local-application.conf \
-Dspark.master=local[*]
After one run, in the HERE platform environment, you can inspect the local catalog with the OLP CLI:
olp local catalog inspect hrn:local:data:::pedestrian-topologies-scala
You should see the following result:
To follow this example, you will need a project. A project is a collection of platform resources (catalogs, pipelines, and schemas) with controlled access. You can create a project through the HERE platform portal.
Alternatively, use the OLP CLI olp project create
command to create the project:
olp project create $PROJECT_ID $PROJECT_NAME
The command returns the HERE Resource Name (HRN) of your new project. Note down this HRN as you will need it later in this tutorial.
You do not have to provide a
--scope
parameter if your app has a default scope. For details on how to set a default project scope for an app, see the Specify a default Project for Apps chapter of the Identity & Access Management Developer Guide.
For more information on how to work with projects, see the Organize your work in projects tutorial.
The catalog you need to create is used to store the pedestrian topologies generated by the compiler.
- Use the
olp catalog create
command to create the catalog. Make sure to note down the HRN returned by the following command for later use:
olp catalog create $CATALOG_ID $CATALOG_ID \
--summary "Pedestrian topologies extracted from HERE Map Content" \
--description "Pedestrian topologies extracted from HERE Map Content" \
--scope $PROJECT_HRN
- Use the
olp catalog layer add
command to add two versioned layers to your catalog:
olp catalog layer add $CATALOG_HRN pedestriansegments pedestriansegments --versioned --summary "pedestrian segments" \
--description "pedestrian segments" --partitioning heretile:14 \
--content-type application/vnd.geo+json --scope $PROJECT_HRN
olp catalog layer add $CATALOG_HRN state state --versioned --summary "state" \
--description "state" --partitioning Generic \
--content-type application/octet-stream --scope $PROJECT_HRN
If a billing tag is required in your realm, use the
--billing-tags: "YOUR_BILLING_TAG"
parameter.
- Use the
olp project resource link
command to link the HERE Map Content catalog to your project:
olp project resource link $PROJECT_HRN $CATALOG_RIB
- For more details on catalog commands, see Catalog Commands.
- For more details on layer commands, see Layer Commands.
- For more details on project commands, see Project Commands.
- For instructions on how to link a resource to a project, see Project Resource Link command.
From the SDK examples directory, open the data-processing/scala/pedestrian-topologies-extraction-geojson
project in your
Integrated Development Environment (IDE).
The compiler/config/here/pipeline-config.conf
file contains
the permanent configuration of the data sources for the compiler.
Pick the file that corresponds to your platform environment. For example, the pipeline configuration for the HERE platform environment looks like:
pipeline.config {
output-catalog {hrn = "YOUR_OUTPUT_CATALOG_HRN"}
input-catalogs {
rib {hrn = "hrn:here:data::olp-here:rib-2"}
}
}
Replace YOUR_OUTPUT_CATALOG_HRN
with the HRN of your pedestrian topologies catalog.
To find the HRN, in the HERE platform portal, navigate to your catalog. The HRN is displayed in the Catalog info section.
Alternatively, you can use the catalog's HRN from the OLP CLI output from Create a Pedestrian Topologies Catalog.
The config/here/pipeline-job.conf
file
contains the compiler's run configuration.
In this file, modify version = 1
to reflect the version of the HERE Map Content catalog you want
to process. To find the version of the HERE Map Content catalog, in the
HERE platform portal,
navigate to the HERE Map Content catalog, and view the current catalog's version in the Catalog info section.
The remainder of the configuration is specified in the application.conf
file that can be found in the
src/main/resources
directory of the compiler project. However, you do not have to modify it unless
you want to change the behavior of the compiler.
Run the sbt assembly
command in the pedestrian-topologies-extraction-geojson
directory
to generate a fat JAR file to deploy the compiler to a pipeline.
sbt assembly
Once the previous command is finished, your JAR is then available at the target
directory, and you
can upload it using the HERE pipelines UI
or the OLP CLI.
You can use the OLP CLI to create pipeline components and activate the pipeline version with the following commands:
- Create pipeline components:
For this example, a bounding box filter is provided by --runtime-config
parameter to
limit the number of partitions to be processed. This speeds up the compilation process. In this
example, we use a bounding box around the cities of Berlin. You can edit the bounding box coordinates to compile a different
partition of HERE Map Content. Make sure you update the layer coverage to reflect the different
geographical region.
olp pipeline create $COMPONENT_NAME_Pipeline --scope $PROJECT_HRN
olp pipeline template create $COMPONENT_NAME_Template batch-4.0 $PATH_TO_JAR \
com.here.platform.data.processing.example.scala.pedestrian.geojson.Main \
--workers=4 --worker-units=3 --supervisor-units=2 --input-catalog-ids=rib \
--scope $PROJECT_HRN
olp pipeline version create $COMPONENT_NAME_version $PIPELINE_ID $PIPELINE_TEMPLATE_ID \
"$PATH_TO_CONFIG_FOLDER/pipeline-config.conf" \
--runtime-config here.platform.data-processing.executors.partitionKeyFilters.0.className=BoundingBoxFilter \
here.platform.data-processing.executors.partitionKeyFilters.0.param.boundingBox.north=52.67551 \
here.platform.data-processing.executors.partitionKeyFilters.0.param.boundingBox.south=52.338261 \
here.platform.data-processing.executors.partitionKeyFilters.0.param.boundingBox.east=13.76116 \
here.platform.data-processing.executors.partitionKeyFilters.0.param.boundingBox.west=13.08835 \
--scope $PROJECT_HRN
- Activate the pipeline version:
olp pipeline version activate $PIPELINE_ID $PIPELINE_VERSION_ID \
--input-catalogs "$PATH_TO_CONFIG_FOLDER/pipeline-job.conf" \
--scope $PROJECT_HRN
You do not have to specify the input catalog's version, unless you want to. The latest version will be automatically used.
In the HERE platform portal, navigate to your pipeline to see its status.
Once the processing is finished, a new version to your pedestriansegments
layer will be added.
You can now go to the Verify the Output section to inspect the results.
In the HERE platform portal, select the Data tab and find your catalog.
- Open the
pedestriansegments
layer and select the Inspect tab. - On the map, navigate to the location of your bounding box and set the zoom to level 10.
- Finally, select any highlighted partition to view the results displayed on the map.
Results should be drawn on the map.
You should see the following result: