Spatial Database Tips and Tricks Presentation

8/19/2019 Spatial Database Tips and Tricks Presentation

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2009.foss4g.org


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Spatial Database

Tips & Tricks

Paul Ramsey

[email protected]


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Housekeeping

• Copy workshop rom D!D

• Downloa" rom

http#$$%%.%%.%%.%%$%%%$sp"b''(.)ip

• *nstall or not

• *gnore me or not

• +%amples also athttp#$$%%.%%.%%.%%#,','$spatial"btips


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*mpatient People

• They try to install without rea"inginstructions

• -hen you see an error bo% "uringPost*S install/ click 0Ignore1

• Remember to create 0me"or"1

2not 0postgis13 "atabase "uringPost*S install


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*mpatient People


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It’s not dead, it’s just resting…It’s not dead, it’s just resting…


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4oti5ation

• Spatial "atabases are powerul

• o"like/ really

• 6ou "o not nee" 0*S sotware1

• 6our "atabase is 0*S sotware1

• 6ou "o not nee" 0spatialmi""leware1

• See abo5e


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Stan"ar" Database

• Has data types7 5archar

7 integer

7 real

7 "ate


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Spatial Database

• Has spatial data types7 point

7 linestring

7 polygon

7 multipoint

7 multilinestring7 multipolygon


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Stan"ar" Database

• Has one-dimensional indexes7 btree

7 hash


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Spatial Database

• Has spatial indexes7 rtree

7 8ua"tree

7 gri"


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9in" intersecting shapes:


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Start with all bo%es/


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;n" intersecting bo%es/


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then ;n" intersecting

shapes.


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Stan"ar" Database

• Has functions

• -ork against stan"ar" types7 lower23

7 roun"23

7 substring23

7 trim23

7 "ayoweek 23


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Spatial Database

• Has spatial functions

• -ork against spatial types

7 ST


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Open Geospatial Consortium (OGC)

Simple Features for SQL (SFSQL)


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Locator

Spatial


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•No buffer operation

•No union operation•No intersection operation

•No centroid point

•No area or length calculation

L O C A T O R


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• ?inear reerencing system 2?RS3 support

• Spatial analysis an" mining unctions

an" proce"ures 2SD


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• S9SB? compliant

• Aew release/ not as many eatures• Ao coor"inate reerence system

transorms

• -in"ows only• ri" in"e%


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SELECT * FROM the_table

WHERE the_geom.STIntersects(

geometry::STGeomFromText('POINT(0 0)',0) );

SELECT * FROM the_table

WHERE ST_Intersects( the_geom,

ST_GeomFromText('POINT(0 0)',0)

);


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• PostgreSB? $ Post*S

• S9SB? compliant

• pen source 2P?3

• Proprietary $ open source clients

•0geographic1 coor"inates re8uirecare


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• ST


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*nstallation


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*nstallation


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*nstallation


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*nstallation


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Data


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Tomcat

• IAD* con;gure"o PostgreSB? IDJC

o

Connection to 0me"or"1 "atabase IS?T installe"

o Kc#L Ks8l#L

eoSer5er installe"

o Connections to 0me"or"1 tableso Styles or 0me"or"1 tables


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Tomcat


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Workshop


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M' Jase 4ap with -4S


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!

"


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!

"


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#ttp$%%local#ost$&'&'%geoserer%


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var lon = -122.8450;


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var lat = 42.3438;

var zoom = 18;

var map;

function initMap() { map = new OpenLayers.Map( 'map' ,

{controls:[new OpenLayers.Control.MouseDefaults(),

new OpenLayers.Control.LayerSwitcher(),

new OpenLayers.Control.PanZoomBar()],

numZoomLevels:20});

var gmap = new OpenLayers.Layer.Google(

"Google Streets" // the default

);

var gsat = new OpenLayers.Layer.Google(

"Google Satellite",

{type: G_SATELLITE_MAP} );

map.addLayers([gmap, gsat]);

map.setCenter(new OpenLayers.LonLat(lon, lat), zoom);

}


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// Initialize WMS layer from our local

// GeoServer var bwms = new OpenLayers.Layer.WMS(

"Medford Buildings",

"http://localhost:8080/geoserver/wms?",

{ "transparent":"true",

"layers":"medford:buildings", "format":"image/png" },

{ "reproject":"true" }

);

// Add WMS layer to our map

map.addLayer(bwms);


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M

E7Clic k

to

Bu

e

ry


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ME 7 Click to Buery


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function queryDatabase(e) {

// Read the map coordinates from the click event

var lonlat = map.getLonLatFromViewPortPx(e.xy);

// Read the table we are going to query from page

var table = document.getElementById("table").value;

// Construct the query URL var url = "01-click-query.jsp";

url += "?lon=" + lonlat.lon;

url += "&lat=" + lonlat.lat;

url += "&table=" + table;

// Load the URL into an iframe

document.getElementById("query").src = url;

}


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01-click-query.jsp?

lon=-122.8451943397522&

lat=42.344141057680226&

table=medford.taxlots


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. . . . . . .

'Eclick8uery.Gsp


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select

st_geometrytype(the_geom) as geometrytype,

st_area(the_geom) as area, *

from ${param.table}

where

st_contains(

the_geom,

st_transform(

st_setsrid(

st_makepoint(${param.lon},${param.lat}),

4326), 2270))


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SR*DFNF

• ?ocation O Coor"inate SR*D

• Here O 2EE.Q/ (.(3 +PS#(

• ST


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MH7

Clic

kt

o

=n

aly)e


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02-click-analyze.jsp?

lon=-122.8451943397522&

lat=42.344141057680226&

radius=200

select


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select

count(*) as "Number of Lots",

round(avg(st_area(the_geom))::numeric/43560, 1) || ' acres' as

"Average Lot Area",

'$' || avg(impvalue)::integer as "Average Improvement Value", '$' || avg(landvalue)::integer as "Average Land Value",

'$' || avg(impvalue + landvalue)::integer as "Average Total

Value",

avg(yearblt)::integer as "Average Year Built"

from medford.taxlots

where st_dwithin(

taxlots.the_geom,

st_transform(

st_setsrid(

st_makepoint(${param.lon},${param.lat}),

4326), 2270),

${param.radius}

)


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• *n"e%e" "istance 8uery

•ST


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M(

7 Clic

k an

"

Ioin


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oning ta*lots


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+ert#ing is related

to eert#ing else,-ut near t#ings are

more related t#andistant t#ings.

- Waldo Tobler

S f


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Spatial relations#ips are a uniersal /e for joining

ot#er0ise disparate data.

customer ta-le

census ta-le

road ta-le

stream ta-le

oning ta-le

ta*lot ta-le


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select

count(*)

as num_lots, sum(st_area(taxlot.the_geom))

as total_lot_area,

zone.zoning as zoning,

sum(taxlot.landvalue)

as total_land_value,

sum(taxlot.landvalue) /

sum(st_area(taxlot.the_geom))as value_per_ft


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from

medford.taxlots taxlotjoin

medford.zoning zone

on (

st_contains(

zone.the_geom,

st_centroid(taxlot.the_geom)

)

)


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where

st dwithin(


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st_dwithin(

taxlot.the_geom,

st_transform(

st_setsrid(

st_makepoint(

${param.lon},

${param.lat}), 4326),

2270),

${param.radius}

)group by zone.zoning

order by total_lot_area desc


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M

7C

lic kan

"

>n

ion


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{"type":"MultiLineString",

"coordinates":[[

[4289753.869,253537.254], [4290375.489,253518.361]

]]}

eoISA eometry


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Feature

Feature

Geometr

Geometr 1roperties

1roperties

F

e a t u r e

C o

l l e c

t i o n


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${param.sql}

{"type":"FeatureCollection",

"features":[

{"type":"Feature",

"geometry":, "properties":{

"":

""

,

}}

,

]}

l t t j (


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select st_asgeojson(

st_transform(the_geom,900913)

)

from medford.taxlots

where

st_dwithin(

the_geom,

st_transform( st_setsrid(

st_makepoint(-13676108, 5212594),

900913),

2270), 100

)


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// Make a fresh vector layer, pulling features our URL

json_layer = new OpenLayers.Layer.Vector("GeoJSON", {

strategies: [new OpenLayers.Strategy.Fixed()],

protocol: new OpenLayers.Protocol.HTTP({

url: json_url,

format: new OpenLayers.Format.GeoJSON() })

});

// Add our vector layer to the map

map.addLayer(json_layer);


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M


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MX

7 =rbitr a

ry

SB?


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MT7

-a lk

a

Ae

twork


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me"or".storm


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me"or".storm


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select d.node_fm, d.node_to, d.pipe_idfrom

medford.storm_drains d,

medford.storm_drains e

where st_dwithin(d.the_geom, e.the_geom, 5)

and e.node_to = 'D371W28CN0134'

and e.gid != d.gid

and st_distance(

st_endpoint(st_geometryn(e.the_geom, 1)),

st_startpoint(st_geometryn(d.the_geom, 1)) )


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e.node_to = 'D371W28CN0134'


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ST


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ST


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e.gi" NO ".gi"

st


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st


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st


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ST?T*?*A+STR*A22' '/ E E/ 33

• To7 ?*A+STR*A2' '/ E E/ 3


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*n conclusion:


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Stan"ar"s are goo":

SFSQL

G3LGeo4SO5

63L 73S

768

7697FS

Special mi""leware is


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Special mi""leware is

unnecessary:


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2009.foss4g.org

Documents

Spatial Database Tips and Tricks Presentation