Download Spatial Database Tips & Tricks - Pennsylvania State University

Survey
yes no Was this document useful for you?
   Thank you for your participation!

* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project

page
1
page
2
page
3
page
4
page
5
page
6
page
7
page
8
page
9
page
10
page
11
page
12
page
13
page
14
page
15
page
16
page
17
page
18
page
19
page
20
page
21
page
22
page
23
page
24
page
25
Document related concepts
no text concepts found
Transcript 
Spatial Database
Tips & Tricks
Paul Ramsey
[email protected]
It’s not dead, it’s just resting…
Motivation
•
•
•
•
•
•
Spatial databases are powerful
Godlike, really
You do not need “GIS software”
Your database is “GIS software”
You do not need “spatial middleware”
See above
Standard Database
• Has data types
–
–
–
–
varchar
integer
real
date
Spatial Database
• Has spatial data types
–
–
–
–
–
–
point
linestring
polygon
multipoint
multilinestring
multipolygon
Standard Database
• Has one-dimensional indexes
– b-tree
– hash
Spatial Database
• Has spatial indexes
– r-tree
– quad-tree
– grid
Find intersecting shapes…
Start with all boxes,
find intersecting boxes,
then find intersecting shapes.
Standard Database
• Has functions
• Work against standard types
–
–
–
–
–
lower()
round()
substring()
trim()
dayofweek ()
Spatial Database
• Has spatial functions
• Work against spatial types
–
–
–
–
–
ST_Area(geometry)
ST_Distance(geometry,geometry)
ST_Intersects(geometry,geometry)
ST_DWithin(geometry,geometry,radius)
ST_Union(geometry,geometry)
Spatial
Locator
LOCATOR
•
•
•
•
•
No buffer operation
No union operation
No intersection operation
No centroid point
No area or length calculation
SPATIAL
• Linear referencing system (LRS) support
• Spatial analysis and mining functions and
procedures (SDO_SAM package)
• Geocoding support (SDO_GCDR package)
• GeoRaster support
• Topology data model
• Network data model
• SFSQL compliant
• New release, not as many features
• No coordinate reference system
transforms
• Windows only
• Grid index
SELECT * FROM the_table
WHERE ST_Intersects(
the_geom,
ST_GeomFromText('POINT(0 0)',0)
);
SELECT * FROM the_table
WHERE the_geom.STIntersects(
geometry::STGeomFromText('POINT(0 0)',0)
);
•
•
•
•
•
PostgreSQL / PostGIS
SFSQL compliant
Open source (GPL)
Proprietary / open source clients
“geographic” coordinates require care
Related documents