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From Apache Wiki <>
Subject [Incubator Wiki] Update of "SpatialProposal" by PatrickOLeary
Date Fri, 05 Feb 2010 16:07:17 GMT
Dear Wiki user,

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The "SpatialProposal" page has been changed by PatrickOLeary.
The comment on this change is: Initial Apache Spatial Proposal.


New page:
== Apache SIS, A toolkit for constructing spatial information systems. ==
=== Abstract ===
Spatial information systems (SIS) (akin to Geographic Information Systems, or GIS) are rapidly
growing as information has taken on a sense of location. This location context has allowed
people to start exploring different ways of searching, clustering, and displaying information.
Spatial queries such as:

 * '''point-radius''', e.g., show me all objects within X miles of point P, typically a lat/lon;
 * '''bounding box''', e.g., show me all objects within a box defined by south, east, north,
west bounding coordinates; and
 * '''polygon''', an extension of bounding box to arbitrary shapes defined by arbitrary points

are becoming a part of everyday life, where some combination of the above is used to find
a restaurant, determine sites of interest for climate research, for data reduction and subsetting,
or demographic profiling, social networking, and a host of other applications. There exist
a number of libraries, and frameworks written in Java, C/C++, and other P/Ls that deal with
the aforementioned issues, however the one consistent homogeneity is that most of these software
do not include ASF-friendly licensing. On the contrary, most of these software systems and
tools are LGPL licensed, as their use is primarily to produce GIS software, which is then
sold for a profit. What's more, even the standards organization the Open Geospatial Consortium
(OGC) promotes the use of LGPL SIS/GIS software to implements its interfaces and specifications,
leaving those interested in a more ASL-friendly solution with a major hole to fill, or having
to deal with the license implications of leveraging LGPL open source software in their applications.

We propose to construct Apache SIS, an ASL 2.0 licensed toolkit that spatial information system
builders or users can leverage to support the aforementioned activities, alleviating much
of the software and potentially legal difficulties in implementing SIS/GIS systems. This project
will look to expand on those concepts and serve as a place to store reference implementations
of spatial algorithms, utilities, services, etc. as well as serve as a sandbox to explore
new ideas. Further, the goal is to have Apache SIS grow into a thriving Apache top-level community,
where a host of SIS/GIS related software (OGC datastores, REST-ful interfaces, data standards,
etc.) can grow from and thrive under the Apache umbrella.

=== Proposal ===
The Internet is changing to the "local world" wide web, where information no longer exists
in a digital vapor, but contains real world context. From news stories to tweets, location
is a very powerful concern, evidenced by the proliferation of popular websites offering geo-referenced
information for all relevant content ([[|Flickr]],
[[|Twitter]], [[|Google
Maps]], etc). Besides the social utility of spatial data, there are also national interest
related uses of prime importance. For example, from a national policy perspective, and federal
agency perspective (e.g., NASA, NOAA, DoD), global climate concerns have underscored the importance
of science data collected about our planet, all of which is location based. So-called "operational"
and "actionable" data including climate models, weather forecasts as well as scientific, "offline"
data (measurements of CO2 in the atmosphere, measurements of sea surface temperature, etc.)
all provide some sense of where the data was created, where currently resides, and/or what
it references. These are just a sampling of the spatially relevant information available --
the list is growing as scientists, policy-makers and decision makers develop new downstream
activities that leverage spatial data. As we move forward there is also no reason to restrict
the focus of SIS/GIS to ''just this planet'' as a point of reference; other sciences (astrophysics,
planetary science) have been collecting information about our universe and other celestial
bodies for years, information that could be "spatial"-enabled. There has been a growing recent
interest in data collected about the Earth's moon as in the case of NASA's [[|Lunar
Reconnaissance Orbiter]], its [[|Lunar
CRater Observation and Sensing Satellite (LCROSS)]] and its [[|Lunar
Mapping and Modeling Project (LMMP)]], as well as [[|Google Moon]]
and other such projects. Spatial data can offer substantial value added for consumers of data
through the use of location-rich metadata, as well as through the use of layering, allowing
users of spatial data to explore layers of data (points of interest, elevation and other parameters)
in an interactive fashion. What's more, the algorithms that drive SIS/GIS can be leveraged
to represent data which is not just geographical based, such as bio-informatics, fingerprints
search, facial search etc., providing substantial reuse benefits if an ASF-friendly software
system that provided SIS/GIS functionality existed. Apache SIS will provide a manner in which
spatial data such as that described above can be represented and used with existing technologies.
The proposed founders of Apache SIS all have relevant and experience either developing spatial
software that can easily perform the above tasks, or have experience working on the domains
containing the georeferenced data of interest. We will leverage this experience and data expertise
to deliver an Apache SIS system of use to a broad community of interest, making Apache an
ideal home for this important software.

=== Background ===
There are several projects of different spatial capabilities available today, the two most
common are:

 * GeoTools
 * PostGIS

Apache SIS goal is not aiming to compete with these tools but, instead, to provide a spatial
framework that enables better representation of coordinates for searching, data clustering,
archiving, or any other relevant spatial needs. By developing a toolkit framework that is
independent of underlying implementation we hope to also reduce duplication of both software
and effort with a published interface which other software projects can simply tie it into
their own frameworks. The initial concept behind Apache SIS comes from [[|LocalLucene]],
an extension to [[|Apache Lucene]] that provided a Geographical filter
on top of the Lucene search library. LocalLucene went on to become [[|LocalSolr]],
and has since been included in many frameworks from [[|Spring]]
to [[|Hibernate]], to [[|Hbase]],
and to [[|Compass]]. The LocalLucene framework has also been
contributed to Apache Lucene under the moniker "Spatial Lucene", and currently exists as a
contrib module within the Lucene project, version 2.9 and later. From January 2009-Dec 2009,
while working on building out spatial capabilities in Apache SOLR for oceans-data and lunar-data
related projects at NASA JPL, Chris Mattmann stumbled across LocalLucene and LocalSOLR, and
eventually discussed its limitations and benefits with Patrick O'Leary, along with the rest
of the proposed committers in this effort. The consensus was there was a significant lack
of a generic spatial data focused library out there in Apache land, and if present, such a
library would present a unique contribution to the folks who were working with GIS data, that
weren't only interested in search. In other words, there are a host of activities besides
search (visualization, data reduction, statistical analysis) where a generic SIS/GIS library
would be of prime importance. Both Chris, and Patrick, as well as the other committers had
been stung by the issues in dealing with LGPL libraries and there was a difficult time finding
any SIS library that was useful, and also ASL licensed. From these conversations, Patrick
and Chris approached Ian Holsman, and asked for his support in championing this proposal and
helping to get this effort started. From there, we all agreed that the general community at
large would be best served by establishing a top level project that focused primarily on solving
spatial problems including search, visualization, data reduction and the aforementioned use

 . Apache SIS will also be the first known spatial project of this nature to be licensed under
Apache License v2.0, [[|the vast majority of other GIS projects are
LGPL]]. Further Apache SIS will be the first known (to our knowledge) Apache top level project
focused on implementing spatial standards, and focused on building an Apache-based community
in this thriving area.

=== Initial Goals ===
 . The initial goals of the proposed project are:

 * Viable community around the Apache SIS codebase
 * Active relationships and possible cooperation with related projects and communities such
as OGC
 * Provide a geo-spatial coordinate system, with planetary plugins.
 * Provide a polygon and line string coordinate comparison system.
 * Build a Java framework to start out, but look to develop other P/L support (Python, Ruby,
as a start).

== Current Status ==
=== Meritocracy ===
All the initial committers are familiar with the meritocracy principles of Apache, and have
already worked on the various source code bases (incl. Lucene Contrib, Tika, Nutch, and SOLR),
providing issue comments, patches, and in some cases, committing (O'Leary & Mattmann)
and participating as PMC members (Mattmann). We will follow the normal meritocracy rules also
with other potential contributors.

=== Community ===
That Apache SIS community will be a co-mingling of several other communities that depend on
Spatial & Geo Spatial solutions for their projects, the expectation is there will be members
from the original LocalLucene project, the strong LocalSolr project, as well as Compass, Lucene
and Solr at very early if not immediate stages. We will also look to garner support and contributions
from other projects that are working in spatial, e.g., PostGIS, and other OGC efforts as well.
There is already a growing number of folks at NASA who are also interested in spatial systems
and work in the area. We will approach those people as well and attempt to bring them into
the Apache SIS community. The idea would be for Apache SIS to grow into a top-level project
that allows for sub projects based on SIS focus (visualization, data reduction/algorithms,
OGC standards, etc.)

=== Core Developers ===
The initial developers come from a diverse set of backgrounds ranging from software architecture,
search, academic, research/practice, to data mining. All of the proposed initial developers
require the functionality of Apache SIS (Ramirez - LMMP, McCleese - oceans data, Mattmann
-lunar/oceans, O'Leary - local search) in a compatible way.

=== Alignment ===
Existing Apache projects currently rely on the proposed starting point for Apache SIS, such
as Lucene and Solr. We will begin by refactoring the LocalLucene contribution into a library
independent of any underlying substrate (e.g., independent of Lucene). We will then look to
add in functionality for calculating distances, functionality for persisting spatial data
(to DBMS'es, search indexes, key/value stores, to [[|Hadoop]]/etc.)
We will follow by then focusing on data models and export of spatial data, culminating in
an initial release that includes all of the basic functionality to at a minimum compute on
spatial data, and store/export it.

== Known Risks ==
=== Orphaned products ===
Several projects currently contain implementations of the initial code basis for Apache SIS,
these projects can continue with the existing code base without impact, or adopt Apache SIS
and reap the benefits of a common code base. Our goal is to provide value-added, shared ASL-licensed
spatial software that is easy to adapt and adopt in any of the existing Apache (and external
communities) developing SIS/GIS. Our initial focus will be on building a Java library but
we will look at means for extending the Java library into additional P/Ls and frameworks.

=== Inexperience with Open Source ===
All the initial developers have worked on open source before and many are committers (O'Leary,
Mattmann) and PMC members (Mattmann) within other Apache projects. McCleese and Ramirez are
recent Apache committers on the soon to be initiated [[<>|OODT
project that was accepted into the Incubator]].

=== Homogenous Developers ===
The initial developers come from a variety of backgrounds and with a variety of needs for
the proposed toolkit. Further, the developers consist of folks from at least two widely diverse
companies, AT&T Interactive and NASA's Jet Propulsion Laboratory, spanning industry and

=== Relationships with Other Apache Products ===
Apache SIS is related to the following projects, non of the projects are direct competitors,
but contain some functionality provided by Apache SIS

 * Lucene Java, contains Spatial Lucene. We will look to leverage this code, combined with
updates present at Local Lucene at Sourceforge as a starting point for the refactoring activity.
 * Apache Solr, uses functionality from Spatial Lucene and may have some inspiration for how
to perform some of the spatial computations we would like to have present in Apache SIS. Once
Apache SIS matures, Solr could rely on SIS as a library component.
 * Apache HBase - can index spatial reference id's and incorporate SIS query methodology to
extend it to providing Spatial services once Apache SIS matures.

== Initial Source ==
Apache SIS is an amalgamation of Spatial Lucene, and LocalSolr components.

 * Spatial Lucene contains the original Spatial Coordinate system
 * LocalSolr provides polygon and line string builders and comparator features.
 * Local Lucene at Sourceforge contains a number of updates that we will merge into Apache

The above code sources will serve as a basis for a fundamental generalization and refactoring
activity that will result in an Apache SIS system focused on: spatial computation, and spatial
data storage/export to start out. Activities such as visualization, reduction, and standards
will occur downstream of this initial activity once the code base becomes stable.

== Source and Intellectual Property Submission Plan ==
All seed code and other contributions will be handled through the normal Apache contribution

We will also contact other related efforts for possible cooperation and contributions. Local
Lucene is ASL-licensed, as is the other code bases (Local SOLR, and Spatial Lucene). All proposed
committers have CLAs on file and are familiar with the code contribution process in Apache.

== External Dependencies ==
At the moment, we will build Apache SIS so that is has no external dependencies, and is self
contained. If we do require common dependencies, such as libraries for computation, or for
storage/persistence, we will ensure that they leverage an ASL or compatible license. For example,
to support persistence, we may leverage other libraries (e.g., Derby, K/V stores, etc.), and
in these cases, we will focus on those libraries with a compatible license.

== Cryptography ==
There is no cryptography required in Apache SIS at present time.

== Required Resources ==
 . Mailing lists


Subversion Directory


Issue Tracking


Other Resources


== Initial Committers ==
||'''Name''' ||'''Email''' ||'''Institution''' ||'''CLA''' ||
||Patrick O'Leary ||pjaol at apache dot org ||AT&T Interactive ||yes ||
||Chris A. Mattmann ||mattmann at apache dot org ||[[|NASA Jet Propulsion
Laboratory]] ||yes ||
||Sean McCleese||smcclees at jpl dot nasa dot gov||[[|NASA Jet Propulsion
Laboratory]] ||yes ||
||Paul Ramirez||pramirez at jpl dot nasa dot gov||[[|NASA Jet Propulsion
Laboratory]] ||yes ||

== Sponsors ==
 . '''Champion '''

 * Ian Holsman (ianh at apache dot org)

'''Nominated Mentors '''

 * Ian Holsman (ianh at apache dot org)

'''Sponsoring Entity '''

Apache Incubator

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