Closed Robinlovelace closed 3 years ago
Updated error message is clearer:
remotes::install_github("itsleeds/slopes")
#> Using github PAT from envvar GITHUB_PAT
#> Skipping install of 'slopes' from a github remote, the SHA1 (d7869d0e) has not changed since last install.
#> Use `force = TRUE` to force installation
library(slopes)
library(sf)
#> Linking to GEOS 3.9.0, GDAL 3.2.1, PROJ 7.2.1
routes = lisbon_road_segments[1:3, ]
st_crs(routes)
#> Coordinate Reference System:
#> User input: ETRS89 / Portugal TM06
#> wkt:
#> PROJCRS["ETRS89 / Portugal TM06",
#> BASEGEOGCRS["ETRS89",
#> DATUM["European Terrestrial Reference System 1989",
#> ELLIPSOID["GRS 1980",6378137,298.257222101,
#> LENGTHUNIT["metre",1]]],
#> PRIMEM["Greenwich",0,
#> ANGLEUNIT["degree",0.0174532925199433]],
#> ID["EPSG",4258]],
#> CONVERSION["Portugual TM06",
#> METHOD["Transverse Mercator",
#> ID["EPSG",9807]],
#> PARAMETER["Latitude of natural origin",39.6682583333333,
#> ANGLEUNIT["degree",0.0174532925199433],
#> ID["EPSG",8801]],
#> PARAMETER["Longitude of natural origin",-8.13310833333333,
#> ANGLEUNIT["degree",0.0174532925199433],
#> ID["EPSG",8802]],
#> PARAMETER["Scale factor at natural origin",1,
#> SCALEUNIT["unity",1],
#> ID["EPSG",8805]],
#> PARAMETER["False easting",0,
#> LENGTHUNIT["metre",1],
#> ID["EPSG",8806]],
#> PARAMETER["False northing",0,
#> LENGTHUNIT["metre",1],
#> ID["EPSG",8807]]],
#> CS[Cartesian,2],
#> AXIS["easting (X)",east,
#> ORDER[1],
#> LENGTHUNIT["metre",1]],
#> AXIS["northing (Y)",north,
#> ORDER[2],
#> LENGTHUNIT["metre",1]],
#> USAGE[
#> SCOPE["unknown"],
#> AREA["Portugal - mainland - onshore"],
#> BBOX[36.95,-9.56,42.16,-6.19]],
#> ID["EPSG",3763]]
st_crs(routes) = NA
dem = dem_lisbon_raster
(s = slope_raster(routes, dem))
#> Error in slope_raster(routes, dem): CRS of routes not known. Set the CRS, e.g. as follows:
#> sf::st_crs(routes) = 4326 # if the routes are in lon/lat coordinates
cor(routes$Avg_Slope, s)
#> Error in is.data.frame(y): object 's' not found
Created on 2021-08-17 by the reprex package (v2.0.1)
Example:
Created on 2021-08-17 by the reprex package (v2.0.1)