File:Kyllikki saari murder site cost atob btoa neg exp 1 1 1 1.png
Original file (730 × 732 pixels, file size: 221 KB, MIME type: image/png)
Captions
Captions
Summary
[edit]
| Description |
English: Kyllikki Saari murder site - negative exponent of minimum cost. Input data: grave and bike. |
| Date | |
| Source | Own work |
| Author | Merikanto |
| Camera location |   | View this and other nearby images on: OpenStreetMap |  |
|---|
This image uses OpenStreetMap
Open Database Licence
https://www.openstreetmap.org/copyright
"R" script to calculate raster from distance raster.
Distance raster must done separately with QGIS etc utility
- attempt to make walk cost analysis
- ## input sites A, B and distance from roads
- 29.9.2023 0000.0000.0001
library(raster)
library(gdistance)
library(sp)
library(leaflet)
library(htmlwidgets)
library(mapview)
library(utils)
- input roads geojson
- if you gan get like this to work
-
- gdal_rasterize -a id -sql "select id, * from ways4" -ot Byte -ts 1024 1024 ways4.geojson www0.tif
- gdal_calc.py --calc='A>0' --outfile=www.tif -A www0.tif
- gdal_proximity.py -srcband 1 -distunits GEO -values 1 -maxdist 50000 -nodata 0 -ot UInt16 -of GTiff www.tif dista.tif
- points A, B
A=c(21.95747269428545, 62.149641560706669 )
B=c( 21.957268833940159, 62.133740877230359 )
C=(A+B)/2
C=c(21.95737,62.14169)
- print(A)
- print(B)
- print(C)
- stop(-1)
- distance from roac coeff
coeff_distance_input_1=10
r <- raster("dista.tif")
r<-r*coeff_distance_input_1
altDiff <- function(x){x[2] - x[1]}
hd <- transition(r, altDiff, 8, symm=FALSE)
slope <- geoCorrection(hd)
adj <- adjacent(r, cells=1:ncell(r), pairs=TRUE, directions=8)
speed <- slope
speed[adj] <- 6 * exp(-3.5 * abs(slope[adj] + 0.05))
Conductance <- geoCorrection(speed)
AtoB <- shortestPath(Conductance, A, B, output="SpatialLines")
BtoA <- shortestPath(Conductance, B, A, output="SpatialLines")
AtoBacc <- accCost(Conductance, A)
BtoAacc <- accCost(Conductance, B)
par(mfrow=c(1,3))
- plot(AtoBacc, main="A to B")
- plot(BtoAacc, main="B to A")
atob_btoa=(AtoBacc+BtoAacc)/2
r2<-atob_btoa
rout1=exp(-r2/255)
- e = extent(c(xmax = 73.4, xmin = 74, ymin = 18.3, ymax = 18.72))
- clip raster to the bounding box
- data = crop(data,e)
crs(rout1) <- "+proj=longlat +datum=WGS84 +no_defs +ellps=WGS84 +towgs84=0,0,0"
plot(rout1)
writeRaster(rout1, "kosto1", format = "GTiff", overwrite=TRUE)
- pal<-colorNumeric(ras@legend@colortable,0:255,na.color = "transparent")
- pal <- colorBin("Reds", domain = 0:10)
pal = leaflet::colorNumeric(palette ="YlOrRd", values(rout1),
na.color = "transparent")
m <- leaflet() %>%
addTiles() %>%
setView(lng=21.95737, lat=62.14169, zoom =12)%>%
## addMarkers(lng=21.95747269428545, lat=62.149641560706669, popup="Hauta") %>%
## addMarkers(lng=21.957268833940159, lat=62.133740877230359, popup="Pyörä") %>%
addCircleMarkers(lng=21.95747269428545, lat=62.149641560706669, radius=6, color='#000',stroke = FALSE, fillOpacity = 1.0, popup="Hauta") %>%
addCircleMarkers(lng=21.957268833940159, lat=62.133740877230359, radius=6, color='#003',stroke = FALSE, fillOpacity = 1.0, popup="Pyörä") %>%
#addRasterImage(rout1,opacity = 0.5)
addPolylines(data = rasterToContour(rout1, nlevels=30), weight = 0.5, color = "#00F", opacity=0.33) %>%
addRasterImage(rout1,opacity = 0.33, colors=pal)
m
saveWidget(m, file = "./out.html", selfcontained = FALSE, libdir = 'leafletwidget_libs')
mapshot(m, file ="./out.png", selfcontained=FALSE)
Sites
{
"type": "FeatureCollection",
"name": "sites1",
"crs": { "type": "name", "properties": { "name": "urn:ogc:def:crs:OGC:1.3:CRS84" } },
"features": [
{ "type": "Feature", "properties": { "id": 1 }, "geometry": { "type": "Point", "coordinates": [ 21.95747269428545, 62.149641560706669 ] } },
{ "type": "Feature", "properties": { "id": 2 }, "geometry": { "type": "Point", "coordinates": [ 21.957268833940159, 62.133740877230359 ] } }
]
}
Roads geojson data
{
"type": "FeatureCollection",
"name": "ways4",
"crs": { "type": "name", "properties": { "name": "urn:ogc:def:crs:OGC:1.3:CRS84" } },
"features": [
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 12:44, 29 August 2023 | | 730 × 732 (221 KB) | Merikanto (talk | contribs) | Update on layout: contours, spots |
| 09:57, 29 August 2023 |  | 992 × 744 (193 KB) | Merikanto (talk | contribs) | Uploaded own work with UploadWizard |
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