GeoMesa Kudu Quick Start
========================
This tutorial is the fastest and easiest way to get started with GeoMesa using Apache Kudu.
It is a good stepping-stone on the path to the other tutorials, that present increasingly
involved examples of how to use GeoMesa.
About this Tutorial
-------------------
In the spirit of keeping things simple, the code in this tutorial only
does a few small things:
1. Establishes a new (static) SimpleFeatureType
2. Prepares the Kudu tables to store this type of data
3. Creates a few thousand example SimpleFeatures
4. Writes these SimpleFeatures to Kudu
5. Queries for a given geographic rectangle, time range, and attribute
filter, writing out the entries in the result set
6. Uses GeoServer to visualize the data (optional)
Prerequisites
-------------
Before you begin, you must have the following installed and configured:
- `Java <http://java.oracle.com/>`__ JDK 1.8
- Apache `Maven <http://maven.apache.org/>`__ |maven_version|
- a GitHub client
- a Kudu cluster
Download and Build the Tutorial
-------------------------------
Pick a reasonable directory on your machine, and run:
.. code-block:: bash
$ git clone https://github.com/geomesa/geomesa-tutorials.git
$ cd geomesa-tutorials
.. warning::
Make sure that you download or checkout the version of the tutorials project that corresponds to
your GeoMesa version. See :ref:`tutorial_versions` for more details.
To ensure that the quick start works with your environment, modify the ``pom.xml``
to set the appropriate versions for Kudu, etc.
For ease of use, the project builds a bundled artifact that contains all the required
dependencies in a single JAR. To build, run:
.. code-block:: bash
$ mvn clean install -pl geomesa-tutorials-kudu/geomesa-tutorials-kudu-quickstart -am
Running the Tutorial
--------------------
On the command line, run:
.. code-block:: bash
$ java -cp geomesa-tutorials-kudu/geomesa-tutorials-kudu-quickstart/target/geomesa-tutorials-kudu-quickstart-$VERSION.jar \
org.geomesa.example.kudu.KuduQuickStart \
--kudu.master <master> \
--kudu.catalog <table>
where you provide the following arguments:
- ``<master>`` the Kudu master server
- ``<table>`` the name of the destination table that will be used for the
quickstart records. This table should either not exist or should be empty
Optionally, you can also specify that the quick start should delete its data upon completion. Use the
``--cleanup`` flag when you run to enable this behavior.
Once run, you should see the following output:
.. code-block:: none
Loading datastore
Creating schema: GLOBALEVENTID:String,Actor1Name:String,Actor1CountryCode:String,Actor2Name:String,Actor2CountryCode:String,EventCode:String,NumMentions:Integer,NumSources:Integer,NumArticles:Integer,ActionGeo_Type:Integer,ActionGeo_FullName:String,ActionGeo_CountryCode:String,dtg:Date,geom:Point:srid=4326
Generating test data
Writing test data
Wrote 2356 features
Running test queries
Running query BBOX(geom, -120.0,30.0,-75.0,55.0) AND dtg DURING 2017-12-31T00:00:00+00:00/2018-01-02T00:00:00+00:00
01 719027236=719027236|UNITED STATES|USA|INDUSTRY||012|1|1|1|3|Central Valley, California, United States|US|2018-01-01T00:00:00.000Z|POINT (-119.682 34.0186)
02 719027005=719027005|UNITED STATES|USA|||172|2|2|2|3|Long Beach, California, United States|US|2018-01-01T00:00:00.000Z|POINT (-118.189 33.767)
03 719026204=719026204|JUDGE||||0214|6|1|6|3|Los Angeles, California, United States|US|2018-01-01T00:00:00.000Z|POINT (-118.244 34.0522)
04 719025745=719025745|KING||||051|4|2|4|2|California, United States|US|2018-01-01T00:00:00.000Z|POINT (-119.746 36.17)
05 719026858=719026858|UNITED STATES|USA|||010|20|2|20|2|California, United States|US|2018-01-01T00:00:00.000Z|POINT (-119.746 36.17)
06 719026964=719026964|UNITED STATES|USA|||081|2|2|2|2|California, United States|US|2018-01-01T00:00:00.000Z|POINT (-119.746 36.17)
07 719026965=719026965|CALIFORNIA|USA|||081|8|1|8|2|California, United States|US|2018-01-01T00:00:00.000Z|POINT (-119.746 36.17)
08 719025635=719025635|PARIS|FRA|||010|2|1|2|3|Las Vegas, Nevada, United States|US|2018-01-01T00:00:00.000Z|POINT (-115.137 36.175)
09 719026918=719026918|UNITED STATES|USA|||042|20|5|20|3|Las Vegas, Nevada, United States|US|2018-01-01T00:00:00.000Z|POINT (-115.137 36.175)
10 719027141=719027141|ALABAMA|USA|JUDGE||172|8|1|8|2|Nevada, United States|US|2018-01-01T00:00:00.000Z|POINT (-117.122 38.4199)
Returned 669 total features
Running query BBOX(geom, -120.0,30.0,-75.0,55.0) AND dtg DURING 2017-12-31T00:00:00+00:00/2018-01-02T00:00:00+00:00
Returning attributes [GLOBALEVENTID, dtg, geom]
01 719027208=719027208|2018-01-01T00:00:00.000Z|POINT (-89.6812 32.7673)
02 719026313=719026313|2018-01-01T00:00:00.000Z|POINT (-84.388 33.749)
03 719026419=719026419|2018-01-01T00:00:00.000Z|POINT (-84.388 33.749)
04 719026316=719026316|2018-01-01T00:00:00.000Z|POINT (-83.6487 32.9866)
05 719027132=719027132|2018-01-01T00:00:00.000Z|POINT (-81.2793 33.4968)
06 719026819=719026819|2018-01-01T00:00:00.000Z|POINT (-81.9296 33.7896)
07 719026952=719026952|2018-01-01T00:00:00.000Z|POINT (-81.9296 33.7896)
08 719026881=719026881|2018-01-01T00:00:00.000Z|POINT (-82.0193 34.146)
09 719026909=719026909|2018-01-01T00:00:00.000Z|POINT (-82.0193 34.146)
10 719026951=719026951|2018-01-01T00:00:00.000Z|POINT (-82.0193 34.146)
Returned 669 total features
Running query EventCode = '051'
01 719024909=719024909|||MELBOURNE|AUS|051|10|1|10|4|Melbourne, Victoria, Australia|AS|2018-01-01T00:00:00.000Z|POINT (144.967 -37.8167)
02 719025178=719025178|AUSTRALIA|AUS|COMMUNITY||051|20|2|20|4|Sydney, New South Wales, Australia|AS|2018-01-01T00:00:00.000Z|POINT (151.217 -33.8833)
03 719025965=719025965|MIDWIFE||||051|10|1|10|4|Sydney, New South Wales, Australia|AS|2018-01-01T00:00:00.000Z|POINT (151.217 -33.8833)
04 719025509=719025509|COMMUNITY||AUSTRALIA|AUS|051|2|1|2|1|Australia|AS|2018-01-01T00:00:00.000Z|POINT (135 -25)
05 719025742=719025742|KING||||051|22|3|22|3|San Diego, California, United States|US|2018-01-01T00:00:00.000Z|POINT (-117.157 32.7153)
06 719025745=719025745|KING||||051|4|2|4|2|California, United States|US|2018-01-01T00:00:00.000Z|POINT (-119.746 36.17)
07 719025743=719025743|AUTHORITIES||||051|60|12|60|3|Wichita, Kansas, United States|US|2018-01-01T00:00:00.000Z|POINT (-97.3375 37.6922)
08 719027205=719027205|UNITED STATES|USA|SIOUX||051|4|1|4|3|Sioux City, Iowa, United States|US|2018-01-01T00:00:00.000Z|POINT (-96.4003 42.5)
09 719025111=719025111|||UNITED STATES|USA|051|2|1|2|3|Pickens County, South Carolina, United States|US|2018-01-01T00:00:00.000Z|POINT (-82.7165 34.9168)
10 719026938=719026938|PITTSBURGH|USA|||051|5|1|5|3|York County, Pennsylvania, United States|US|2018-01-01T00:00:00.000Z|POINT (-77 40.1254)
Returned 138 total features
Running query EventCode = '051' AND dtg DURING 2017-12-31T00:00:00+00:00/2018-01-02T00:00:00+00:00
Returning attributes [GLOBALEVENTID, dtg, geom]
01 719024909=719024909|2018-01-01T00:00:00.000Z|POINT (144.967 -37.8167)
02 719025178=719025178|2018-01-01T00:00:00.000Z|POINT (151.217 -33.8833)
03 719025965=719025965|2018-01-01T00:00:00.000Z|POINT (151.217 -33.8833)
04 719025509=719025509|2018-01-01T00:00:00.000Z|POINT (135 -25)
05 719025742=719025742|2018-01-01T00:00:00.000Z|POINT (-117.157 32.7153)
06 719025745=719025745|2018-01-01T00:00:00.000Z|POINT (-119.746 36.17)
07 719025743=719025743|2018-01-01T00:00:00.000Z|POINT (-97.3375 37.6922)
08 719027205=719027205|2018-01-01T00:00:00.000Z|POINT (-96.4003 42.5)
09 719025111=719025111|2018-01-01T00:00:00.000Z|POINT (-82.7165 34.9168)
10 719026938=719026938|2018-01-01T00:00:00.000Z|POINT (-77 40.1254)
Returned 138 total features
Cleaning up test data
Done
Looking at the Code
-------------------
The source code is meant to be accessible for this tutorial. The main logic is contained in
the generic ``org.geomesa.example.quickstart.GeoMesaQuickStart`` in the ``geomesa-tutorials-common`` module,
which is datastore agnostic. Some relevant methods are:
- ``createDataStore`` get a datastore instance from the input configuration
- ``createSchema`` create the schema in the datastore, as a pre-requisite to writing data
- ``writeFeatures`` use a ``FeatureWriter`` to write features to the datastore
- ``queryFeatures`` run several queries against the datastore
- ``cleanup`` delete the sample data and dispose of the datastore instance
The quickstart uses a small subset of GDELT data. Code for parsing the data into GeoTools SimpleFeatures is
contained in ``org.geomesa.example.data.GDELTData``:
- ``getSimpleFeatureType`` creates the ``SimpleFeatureType`` representing the data
- ``getTestData`` parses an embedded TSV file to create ``SimpleFeature`` objects
- ``getTestQueries`` illustrates several different query types, using CQL (GeoTools' Contextual Query Language)
Visualize Data (optional)
-------------------------
There are two options to visual the data ingested by this quick start. The easiest option is to use the
``export`` command of the GeoMesa Kudu tools distribution. For a more production ready example, you
can alternatively stand up a GeoServer and connect it to your Kudu instance.
Visualize Data With Leaflet
~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. warning::
To successfully run this command you must have a computer that is connected to the internet
in order to access external Leaflet resources.
The ``export`` command is a part of the GeoMesa Kudu command-line tools. In order to use the command,
ensure you have the command-line tools installed as described in :ref:`setting_up_kudu_commandline`.
The ``export`` command provides the ``leaflet`` format which will export the features to a Leaflet map
that you can open in your web browser. To produce the map, run the following command from the GeoMesa
Kudu tools distribution directory:
.. code:: bash
bin/geomesa-kudu export \
--output-format leaflet \
--feature-name gdelt-quickstart \
--master <master> \
--catalog <table>
Where the connection parameters are the same you used above during the quickstart. To view the map simply
open the url provided by the command in your web browser. If you click the menu in the upper right of the
map you can enable and disable the heatmap and feature layers as well as the two provided base layers.
.. figure:: _static/geomesa-quickstart-gdelt-data/leaflet-layer-preview.png
:alt: Visualizing quick-start data with Leaflet
Visualizing quick-start data with Leaflet
Visualize Data With GeoServer
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
You can use GeoServer to access and visualize the data stored in GeoMesa. In order to use GeoServer,
download and install version |geoserver_version|. Then follow the instructions in
:ref:`install_kudu_geoserver` to enable GeoMesa.
Register the GeoMesa Store with GeoServer
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Log into GeoServer using your user and password credentials. Click
"Stores" and "Add new Store". Select the ``Kudu (GeoMesa)`` vector data
source, and fill in the required parameters.
Basic store info:
- ``workspace`` this is dependent upon your GeoServer installation
- ``data source name`` pick a sensible name, such as ``geomesa_quick_start``
- ``description`` this is strictly decorative; ``GeoMesa quick start``
Connection parameters:
- these are the same parameter values that you supplied on the
command line when you ran the tutorial; they describe how to connect
to the Kudu instance where your data reside
Click "Save", and GeoServer will search your Kudu table for any
GeoMesa-managed feature types.
Publish the Layer
~~~~~~~~~~~~~~~~~
GeoServer should recognize the ``gdelt-quickstart`` feature type, and
should present that as a layer that can be published. Click on the
"Publish" link.
You will be taken to the "Edit Layer" screen. You will need to enter values for the data bounding
boxes. In this case, you can click on the link to compute these values from the data.
Click on the "Save" button when you are done.
Take a Look
~~~~~~~~~~~
Click on the "Layer Preview" link in the left-hand gutter. If you don't
see the quick-start layer on the first page of results, enter the name
of the layer you just created into the search box, and press
``<Enter>``.
Once you see your layer, click on the "OpenLayers" link, which will open
a new tab. You should see a collection of red dots similar to the following image:
.. figure:: _static/geomesa-quickstart-gdelt-data/geoserver-layer-preview.png
:alt: Visualizing quick-start data with GeoServer
Visualizing quick-start data with GeoServer
Tweaking the display
~~~~~~~~~~~~~~~~~~~~
Here are just a few simple ways you can play with the visualization:
- Click on one of the red points in the display, and GeoServer will
report the detail records underneath the map area.
- Shift-click to highlight a region within the map that you would like
to zoom into.
- Click on the "Toggle options toolbar" icon in the upper-left corner
of the preview window. The right-hand side of the screen will include
a "Filter" text box. Enter ``EventCode = '051'``, and press on the
"play" icon. The display will now show only those points matching
your filter criterion. This is a CQL filter, which can be constructed
in various ways to query your data. You can find more information
about CQL from `GeoServer's CQL
tutorial <http://docs.geoserver.org/2.9.1/user/tutorials/cql/cql_tutorial.html>`__.
Generating Heatmaps
~~~~~~~~~~~~~~~~~~~
- You can install the Heatmap SLD from the :doc:`geomesa-examples-gdelt` tutorial to try out an optimized
heatmap query.
- After configuring the SLD, in the URL, change ``styles=`` to be
``styles=heatmap``. Once you press ``<Enter>``, the display will
change to a density heat-map.
.. note::
For this to work, you will have to first install the WPS module for GeoServer
as described in :doc:`/user/geoserver`.