Opasnet map: Difference between revisions

Revision as of 14:37, 23 December 2013

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Question

How should GIS data be handled and visualised in Opasnet?

Answer

Original GIS data is stored in a PostgreSQL database.
Data is accessed by R using the RGDAL package and ?? connection.
Data in manipulated in R.
Ovariables are converted to SpatialPointsDataFrame objects using ova2spat function.
Data is displayed by producing a KML file with ?? package.
- The KML file is created with MyPointKML function, if pins are shown.
- The KML file is saved at the R-tools server.
- Google Maps is used to show the KML file on a web page.

Currently, ova2spat and MyPointKML functions are located in OpasnetUtils/Drafts. Therefore, you need this command:

objects.latest("Op_en6007", code_name = "answer") # OpasnetUtils/Drafts. We need MyPointsKML and ova2spat.

This is the projection that the National Land Survey Finland uses: [1].

Key guidance:

rgdal package for R
- GDAL - Geospatial Data Abstraction Library
sp package for R: contains descriptions about the key spatial objects.
Changing the coordinate system of Spatial objects

Rationale

Calculations

Kuopio buildings with Google pin map

+ Show code - Hide code


library(rgdal)
library(maptools)
library(RColorBrewer)
library(classInt)
library(OpasnetUtils)
library(OpasnetUtilsExt)

objects.latest("Op_en6007", code_name = "answer") # [[OpasnetUtils/Drafts]]; we need MyPointsKML and ova2spat.

shp<-readOGR('PG:host=localhost user=postgres dbname=spatial_db','kuopio_house')

shp <- shp[1:100 , ] # Save only 100 buildings for demonstration

plotvar	<- shp@data$ika
nclr	<- 8
plotclr	<- brewer.pal(nclr,"BuPu")
class	<- classIntervals(plotvar,nclr,style="quantile")
colcode	<- findColours(class,plotclr)

epsg4326String <- CRS("+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs")
proj4string(shp)<-("+init=epsg:3067")
shp2	<- spTransform(shp, epsg4326String)

kmlname	<- "Kuopio house data"
kmldescription <- "Random stuff about here"
icon	<- "http://maps.google.com/mapfiles/kml/pal2/icon18.png"
name	<- paste("ika value: ", shp2$ika)
description <- paste("<b>Value:</b>",shp2$ika,"<br><b>Description:</b>",shp2$kayttotark)

dat <- MyPointKML(shp2, kmlname, kmldescription, name, description, icon, colcode)

google.show_kml_data_on_maps(dat)

GoogleMaps Sorvi MML

⇤--#: . Something wrong with sorvi. --Jouni (talk) 12:54, 23 December 2013 (EET) (type: truth; paradigms: science: attack)

+ Show code - Hide code


library(OpasnetUtils)
library(OpasnetUtilsExt)
library(sorvi)
library(rgdal)

data(MML)

shp <- MML[["1_milj_Shape_etrs_shape"]][["kunta1_p"]]

#epsg3857String <- CRS("+proj=merc +lon_0=0 +k=1 +x_0=0 +y_0=0 +a=6378137 +b=6378137 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs")
epsg4326String <- CRS("+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs")
proj4string(shp)<-("+init=epsg:3047")
shp2<-spTransform(shp,epsg4326String)

out<-sapply(slot(shp2,"polygons"),function(x
	{kmlPolygon(
		x,
		name="nimi",
		col='#df0000aa',
		lwd=1,
		border='black',
		description="selite"
	)}
)

data <- paste(
	paste(
		kmlPolygon(
			kmlname =" This will be layer name", 
			kmldescription = "<i>More info about layer here</i>"
		)$header, 
		collapse="\n"
	),
	paste(unlist(out["style",]), collapse="\n"),
	paste(unlist(out["content",]), collapse="\n"),
	paste(kmlPolygon()$footer, collapse="\n"),
	sep=''
)

google.show_kml_data_on_maps(data)

Google with shapefiles

+ Show code - Hide code


library(rgdal)
library(maptools)
library(RColorBrewer)
library(classInt)
library(OpasnetUtils)
library(OpasnetUtilsExt)

shp	<- readOGR('PG:host=localhost user=postgres dbname=spatial_db','watson_wkt')

plotvar	<- shp@data$value_inhalation
nclr	<- 8
plotclr	<- brewer.pal(nclr,"BuPu")
class	<- classIntervals(plotvar,nclr,style="quantile")
colcode	<- findColours(class,plotclr)
epsg4326String <- CRS("+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs")
proj4string(shp)<-("+init=epsg:3035")
shp2	<- spTransform(shp,epsg4326String)


out<-sapply(
	slot(shp2,"polygons"),
	function(x){
		kmlPolygon(
			x,
			name = as(shp2,"data.frame")[slot(x,"ID"),"country_code"], 
			col = colcode[[((as.numeric(slot(x,"ID"))+1))]],
			lwd = 1,
			border = 'black',
			description = paste("Value:",as(shp2,"data.frame")[slot(x,"ID"),"value_inhalation"])
		) 
	}
)

data <- paste(
	paste(
		kmlPolygon(
			kmlname = "This will be layer name", 
			kmldescription = "<i>More info about layer here</i>")$header, 
			collapse="\n"
		),
	paste(unlist(out["style",]), collapse="\n"),
	paste(unlist(out["content",]), collapse="\n"),
	paste(kmlPolygon()$footer, collapse="\n"),
	sep=''
)

cat("PostgreSQL test with coloured data areas.\n")

google.show_kml_data_on_maps(data)

cat("PostgreSQL Test with default data\n")

google.show_data_on_maps()

Google show data from url on map

+ Show code - Hide code

library(OpasnetUtils)
library(OpasnetUtilsExt)
google.show_kml_on_maps(url='http://api.flickr.com/services/feeds/geo/?g=322338@N20&lang=en-us&format=feed-georss')

Google circles

+ Show code - Hide code

library(OpasnetUtilsExt)

data = list()
data[[1]] = c(62.8925, 27.678333, 9683, '#ff0000', 'kuopio') 
data[[2]] = c(65.016667, 25.466667, 14398, '#00ff00', 'oulu') 
data[[3]] = c(60.170833, 24.9375, 59623, '#0000ff', 'helsinki') 

google.circles(data)

Static GoogleMaps

+ Show code - Hide code


library(RgoogleMaps)
library(rgdal)
library(maptools)
library(RColorBrewer)
library(classInt)
library(OpasnetUtils)
library(OpasnetUtilsExt)

objects.latest("Op_en6007", code_name = "answer") # [[OpasnetUtils/Drafts]]. We need MyRmap.

shp	<- readOGR('PG:host=localhost user=postgres dbname=spatial_db','kuopio_house')
proj4string(shp) <- ("+init=epsg:3067") # The map projection of NLS Finland.

#oprint(shp@data[1:100 , ])

epsg4326String <- CRS("+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs")
shp2	<- spTransform(shp,epsg4326String) # Convert to longitude-latitude projection.

MyRmap(shp2, plotvar = "ika", legend_title = "Ikä", numbins = 8, pch = 19, cex = 0.3) # Draw the map.

Keywords

References

Related files

@@ Line 31: / Line 31: @@
 == Rationale ==
-All pieces of the puzzle exist already.
-=== Dependencies ===
 === Calculations ===
@@ Line 79: / Line 74: @@
-==== GoogleMaps Sorvi MML TEST ====
+==== GoogleMaps Sorvi MML ====
 {{attack|#|Something wrong with sorvi.|--[[User:Jouni|Jouni]] ([[User talk:Jouni|talk]]) 12:54, 23 December 2013 (EET)}}
@@ Line 210: / Line 205: @@
 </rcode>
-==== Static GoogleMaps test ====
+==== Static GoogleMaps ====
 <rcode name='staticmapstest' graphics=1 embed=1>

Opasnet map: Difference between revisions

Revision as of 14:37, 23 December 2013

Contents

Question

Answer

Rationale

Calculations

Kuopio buildings with Google pin map

GoogleMaps Sorvi MML

Google with shapefiles

Google show data from url on map

Google circles

Static GoogleMaps

See also

Keywords

References

Related files

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