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fixed CRS errors, added epsg for future

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Jeremy Kidwell 2019-01-30 15:25:50 +00:00
parent 6177c0d2ae
commit 20b756c57d
1 changed files with 13 additions and 6 deletions
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mapping_draft.Rmd
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@ -38,6 +38,7 @@ knitr::opts_chunk$set(fig.path='figures/', warning=FALSE, echo=FALSE, message=FA
```{r load_packages, message=FALSE, warning=FALSE, include=FALSE} ```{r load_packages, message=FALSE, warning=FALSE, include=FALSE}
## Default repo ## Default repo
# setwd("/Users/jeremy/gits/mapping_environmental_action") # setwd("/Users/jeremy/gits/mapping_environmental_action")
# setwd("/Users/kidwellj/OneDrive\ -\ bham.ac.uk/writing/201708_mapping_environmental_action")
# Set repository to be new standard, e.g. cloud server. # Set repository to be new standard, e.g. cloud server.
# This will avoid a dialogue box if packages are to be installed for below on first run. # This will avoid a dialogue box if packages are to be installed for below on first run.
@ -82,10 +83,15 @@ if (dir.exists("derivedData") == FALSE) {
# it is falling out of use in many cases, so will be defaulting to WGS84 in future # it is falling out of use in many cases, so will be defaulting to WGS84 in future
# data-sets and papers. # data-sets and papers.
# TODO: make canonical CRS definitions and use consistently; remove proj4string(admin_lev1) and other similar instances below # TODO: make canonical CRS definitions and use consistently; remove proj4string(admin_lev1) and other similar instances below.
wgs84 <- "+proj=longlat +datum=WGS84"
bng <- "+proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717 +x_0=400000 +y_0=-100000 +datum=OSGB36 +units=m +no_defs +ellps=airy +towgs84=446.448,-125.157,542.060,0.1502,0.2470,0.8421,-20.4894"
# Note, shifting to EPSG codes given the usage of this approach with sf()
bng_epsg <- CRS("+init=epsg:27700")
osgb36 <- CRS("+init=epsg:7405")
wgs84_epsg <- CRS("+init=epsg:4326")
wgs84 = '+proj=longlat +datum=WGS84'
bng = "+proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717 +x_0=400000 +y_0=-100000 +datum=OSGB36 +units=m +no_defs +ellps=airy +towgs84=446.448,-125.157,542.060,0.1502,0.2470,0.8421,-20.4894"
``` ```
# Introduction[^15541312] # Introduction[^15541312]
@ -166,9 +172,10 @@ unzip("data/Scotland_parlcon_2011.zip", exdir = "data")
admin_lev2 <- readOGR("./data", "scotland_parlcon_2011") admin_lev2 <- readOGR("./data", "scotland_parlcon_2011")
# read in Transition Towns data and turn it into a SpatialPointsDataFrame # read in Transition Towns data and turn it into a SpatialPointsDataFrame
transition <- read.csv(text=getURL("https://zenodo.org/record/165519/files/SCCAN_1.4.csv")) transition_wgs <- read.csv(text=getURL("https://zenodo.org/record/165519/files/SCCAN_1.4.csv"))
coordinates(transition) <- c("X", "Y") coordinates(transition_wgs) <- c("X", "Y")
proj4string(transition) <- CRS(wgs84) proj4string(transition_wgs) <- CRS(wgs84)
transition <- spTransform(transition_wgs, bng)
# read in all_churches data and turn it into a SpatialPointsDataFrame # read in all_churches data and turn it into a SpatialPointsDataFrame
# TODO: need to remove all data points which are outside BNG area to # TODO: need to remove all data points which are outside BNG area to