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Taming Rich GML with Stetl
-
A lightweight Python Framework
for Geospatial ETL
Just van den Broecke
FOSS4G Nottingham 2013
Sept 21, 2013
www.justobjects.nl
1
About Me
Independent Open Source Geospatial Professional
Secretary OSGeo Dutch Local Chapter
Member of the Dutch OpenGeoGroep
Just van den Broecke
just@justobjects.nl
www.justobjects.nl
2
We have a
Problem
3
The Rich GML
Problem
4
Rich GML = Complex Mess
5
INSPIRE
Dutch National Datasets
Germany:AFIS-ALKIS-ATKIS
UK: OS Mastermap
.
.
6
“Semi GML”
e.g. Dutch Addresses & Buildings (BAG)
Arbitrary
Nesting
7
The Street Name!
A Street Element in an INSPIRE Annex I Address..
8
Complex
Model
Transformations
9
100+ MB
GML Files
10
11
Millions
of
Objects
12
10s of Millions
of
<Elements>
13
Multiple
Transformation
Steps
14
Solution is
Spatial ETL
15
But How ?
16
FOSS ETL - DIY ? Maybe
17
FOSS ETL - High Level
18
FOSS ETL - Lower Level
Each powerful individually but
cannot do the entire ETL
ogr2ogr
19
FOSS ETL - How to Combine?
=+ + ?
ogr2ogr
20
Example - 2011 INSPIRE-FOSS
http://inspire.kademo.nl/doc/design-etl.html
Good ideas but
hard to scale and reuse.
Need Framework
21
FOSS ETL - Add Python to Equation
=+ + ?( )
ogr2ogr
22
=+ +
Stetl
( )
ogr2ogr
23
Stetl
=
Simple
Streaming
Spatial
Speedy
ETL
24
GML1
GML2
Stetl
From Barrels of GML to Maps
25
26
Stetl
Concepts
27
Process Chain
Input Filter OutputFilter
Stetl concepts
Source Target
28
Process Chain
Input Filter Output
gml
Filter
Stetl concepts
29
Example: GML to PostGIS
Reader ogr2ogr
gml
Stetl concepts
30
Example: INSPIRE Model Transform
ogr2ogr XSLT Writer
gml
Stetl concepts
Simple
Features
Complex
Features
31
Example: deegree Store
ogr2ogr XSLT
deegree
Writer
Stetl concepts
Or via
WFS-T
32
Process Chain - How?
Input Filters Output
Stetl concepts
33
Example: XML to Shape
XML
Input
XSLT
Filter
ogr2ogr
Output
34
Example: XML to Shape
The Source
35
Example: XML to Shape
XML
Input
36
Example: XML to Shape
XML
Input
XSLT
Filter
37
Example: XML to Shape
Prepare XSLT Script
38
Example: XML to Shape
XSLT GML Output
39
Example: XML to Shape
XML
Input
XSLT
Filter
ogr2ogr
Output
40
Example: XML to Shape
The Stetl Config File
Process
Chain
XML
InputXSLT
Filter
ogr2ogr
Output
41
Running Stetl
stetl -c etl.cfg
42
Result Shapefile viewed in QGIS
43
Installing Stetl
via PyPi
Deps
•GDAL+Python bindings
•lxml (xml proc)
•psycopg2 (Postgres)
sudo pip install stetl
44
Speed: Streaming
Input Filter Output
gml
Stetl concepts
45
Speed: Going Native
Input Filter Output
gml
ogr2ogr StetlStetl
Native C Libs/Progs
Calls
Stetl concepts
46
Example Components
Input Filters Output
Stetl concepts
XMLFile XSLT GMLFile
ogr2ogr XMLAssembler ogr2ogr
LineStream XMLValidator WFS-T
deegree* FeatureExtractor deegree*
YourInput YourFilter YourOutput
47
Example: XsltFilter Python
from util import Util, etree
from filter import Filter
from packet import FORMAT
log = Util.get_log("xsltfilter")
class XsltFilter(Filter):
# Constructor
def __init__(self, configdict, section):
Filter.__init__(self, configdict, section, consumes=FORMAT.etree_doc, produces=FORMAT.etree_doc)
self.xslt_file_path = self.cfg.get('script')
self.xslt_file = open(self.xslt_file_path, 'r')
# Parse XSLT file only once
self.xslt_doc = etree.parse(self.xslt_file)
self.xslt_obj = etree.XSLT(self.xslt_doc)
self.xslt_file.close()
def invoke(self, packet):
if packet.data is None:
return packet
return self.transform(packet)
def transform(self, packet):
packet.data = self.xslt_obj(packet.data)
log.info("XSLT Transform OK")
return packet
48
[etl]
chains = input_xml_file|my_filter|output_std
[input_xml_file]
class = inputs.fileinput.XmlFileInput
file_path = input/cities.xml
# My custom component
[my_filter]
class = my.myfilter.MyFilter
[output_std]
class = outputs.standardoutput.StandardXmlOutput
class MyFilter(Filter):
# Constructor
def __init__(self, configdict, section):
Filter.__init__(self, configdict, section, consumes=FORMAT.etree_doc,
produces=FORMAT.etree_doc)
def invoke(self, packet):
log.info("CALLING MyFilter OK!!!!")
return packet
Your Own Components
Stetl concepts
Step 1- Define Class
Step 2- Config Class
49
Data Structures
Stetl concepts
• Components exchange Packets
• Packet contains data and status
• Data formats, e.g. :
xml_line_stream
etree_doc
etree_element (feature)
etree_element_array
string
any
.
.
50
deegree Integration
Stetl concepts
•Input
DeegreeBlobstoreInput
•Output
DeegreeBlobstoreInput
DeegreeFSLoaderOutput
WFSTOutput
51
Cases - The Netherlands
•INSPIRE Download Services
publish to deegree store (WFS)
generate GML files (for Atom Feed)
•National GML Datasets
GML to PostGIS (Top10NL, BGT)
52
[etl]
chains = input_sql_pre|schema_name_filter|output_postgres,
input_big_gml_files|xml_assembler|transformer_xslt|output_ogr2ogr,
input_sql_post|schema_name_filter|output_postgres
# Pre SQL file inputs to be executed
[input_sql_pre]
class = inputs.fileinput.StringFileInput
file_path = sql/drop-tables.sql,sql/create-schema.sql
# Post SQL file inputs to be executed
[input_sql_post]
class = inputs.fileinput.StringFileInput
file_path = sql/delete-duplicates.sql
# Generic filter to substitute Python-format string values like {schema} in string
[schema_name_filter]
class = filters.stringfilter.StringSubstitutionFilter
# format args {schema} is schema name
format_args = schema:{schema}
[output_postgres]
class = outputs.dboutput.PostgresDbOutput
database = {database}
host = {host}
port = {port}
user = {user}
password = {password}
schema = {schema}
# The source input file(s) from dir and produce gml:featureMember elements
[input_big_gml_files]
class = inputs.fileinput.XmlElementStreamerFileInput
file_path = {gml_files}
element_tags = featureMember
Top10NL Extract
Parameter
Substitution
53
Top10NL+BAG (Dutch Topo + Buildings)
54
BGT - Dutch Large Scale Topo
55
Case: INSPIRE DL Services -
Dutch Addresses
Source
<GML>
NLExtract
Stetl
deegree
WFS
INSPIRE
<GML>
Atom
Feed
INSPIRE
Addresses
Dutch
Addresses+
Buildings
deegree
blobstore
Stetl
56
Project Status - Sept 21, 2013
• v1.0.4 installable via PyPi
• Documentation on www.stetl.org
• Real world transforms done
• Seeking feedback, support and
contributors
57
Rich GML
Problem Solved?
58
ThankYou !
www.stetl.org
github.com/justb4/stetl
59

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