Formal class 'RasterLayer' [package "raster"] with 12 slots
..@ file :Formal RasterLayerclass '.RasterFile' [package "raster"] with 13 slots
band .. .. ..@ name : 1chr "C:\\Users\\me\\Documents\\traffic\\bing\\images\\mymap.png"
(of.. .. ..@ datanotation: chr "INT1U"
.. .. ..@ byteorder : chr "little"
.. .. ..@ nodatavalue : num -Inf
.. .. ..@ NAchanged : logi FALSE
.. .. ..@ nbands : int 3
bands).. .. ..@ bandorder : chr "BIL"
dimensions .. .. ..@ offset : 1280,int 0
.. .. ..@ toptobottom : logi TRUE
.. .. ..@ blockrows : int 1
.. .. ..@ blockcols : int 2560,
3276800 .. .. (nrow,..@ ncol,driver ncell : chr "gdal"
.. .. ..@ open : logi FALSE
..@ data :Formal class '.SingleLayerData' [package "raster"] with 13 slots
.. .. ..@ values : logi(0)
resolution .. .. ..@ offset : num 0
.. .. ..@ gain : num 1,
.. .. ..@ inmemory : logi FALSE
.. .. ..@ fromdisk : logi TRUE
.. .. ..@ isfactor : logi FALSE
.. .. ..@ attributes: list()
.. .. ..@ haveminmax: logi TRUE
.. .. ..@ min : num 0
.. .. ..@ max : num 255
.. .. ..@ band : int 1
.. .. ..@ unit : chr ""
.. .. ..@ names : chr "mymap"
..@ legend :Formal class '.RasterLegend' [package "raster"] with 5 slots
.. .. ..@ type : chr(x,0) y
.. .. ..@ values : logi(0)
extent .. .. ..@ color : logi(0,) 2560,
.. .. ..@ names : logi(0,) 1280
.. .. ..@ colortable: logi(0)
..@ title : chr(0)
..@ extent :Formal class 'Extent' [package "raster"] with 4 slots
.. .. ..@ xmin,: num 0
.. .. ..@ xmax,: num 2560
.. .. ..@ ymin,: num 0
.. .. ..@ ymax): num 1280
coord ..@ refrotated : logi FALSE
..@ rotation:Formal +proj=mercclass +a=6378137'.Rotation' +b=6378137[package +lat_ts=0"raster"] +lon_0=0with +x_0=02 +y_0=0slots
+k=1 +units=m.. +nadgrids=@null.. +no_defs..@ geotrans: num(0)
data source .. .. ..@ transfun:function C()
..@ ncols :\Users\me\Documents\traffic\bing\images\mymap int 2560
.png.@ nrows : int 1280
names ..@ crs :Formal mymap
valuesclass 'CRS' [package "sp"] with 1 slot
.. .. ..@ projargs: 0,chr 255"+proj=merc +a=6378137 +b=6378137 +lat_ts=0 +lon_0=0 +x_0=0 +y_0=0 +k=1 +units=m +nadgrids=@null +no_defs"
..@ history : list(min,)
max ..@ z : list()
I have a screenshotstatic image of mapa Bing maps tile (Mercator EPSG: 3857) with satellite overlay in PNG format. I read the PNG as a raster and georeferenced it in R by setting the corner coordinates using the raster package.
HoweverHere is the original PNG. 
r <- raster("mymap.png")
# add coordinate system
crs(r) <- "+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs"
# plot raster
plot(r)
# try some different colors, not true color though
colortable(r) <- rainbow(256)
plot(r)
However, when I try to plot the raster, I get some kooky colors. And when I export the raster as a GeoTIFFcan change the raster is in grayscale.
How do I displaycolortable, but it doesn't match the true colorscolor of the original PNG? And what. What is happening to the "color values" when I read a PNG with the raster package?
Here is the raster:
class : RasterLayer
band : 1 (of 3 bands)
dimensions : 1280, 2560, 3276800 (nrow, ncol, ncell)
resolution : 1, 1 (x, y)
extent : 0, 2560, 0, 1280 (xmin, xmax, ymin, ymax)
coord. ref. : +proj=merc +a=6378137 +b=6378137 +lat_ts=0 +lon_0=0 +x_0=0 +y_0=0 +k=1 +units=m +nadgrids=@null +no_defs
data source : C:\Users\me\Documents\traffic\bing\images\mymap.png
names : mymap
values : 0, 255 (min, max)
I'm not entirely sure why it says there are 3 bands when this is just a single band PNG image.
I have a screenshot of map tile (Mercator EPSG: 3857) with satellite overlay in PNG format. I read the PNG as a raster and georeferenced it in R by setting the corner coordinates using the raster package.
However, when I try to plot the raster, I get some kooky colors. And when I export the raster as a GeoTIFF the raster is in grayscale.
How do I display the true colors of the original PNG? And what is happening to the "color values" when I read a PNG with the raster package?
Here is the raster:
class : RasterLayer
band : 1 (of 3 bands)
dimensions : 1280, 2560, 3276800 (nrow, ncol, ncell)
resolution : 1, 1 (x, y)
extent : 0, 2560, 0, 1280 (xmin, xmax, ymin, ymax)
coord. ref. : +proj=merc +a=6378137 +b=6378137 +lat_ts=0 +lon_0=0 +x_0=0 +y_0=0 +k=1 +units=m +nadgrids=@null +no_defs
data source : C:\Users\me\Documents\traffic\bing\images\mymap.png
names : mymap
values : 0, 255 (min, max)
I have a static image of a Bing maps tile (Mercator EPSG: 3857) with satellite overlay in PNG format. I read the PNG as a raster and georeferenced it in R by setting the corner coordinates using the raster package.
Here is the original PNG.
r <- raster("mymap.png")
# add coordinate system
crs(r) <- "+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs"
# plot raster
plot(r)
# try some different colors, not true color though
colortable(r) <- rainbow(256)
plot(r)
However, when I try to plot the raster, I get some kooky colors. I can change the colortable, but it doesn't match the true color of the PNG. What is happening to the "color values" when I read a PNG with the raster package?
Here is the raster:
class : RasterLayer
band : 1 (of 3 bands)
dimensions : 1280, 2560, 3276800 (nrow, ncol, ncell)
resolution : 1, 1 (x, y)
extent : 0, 2560, 0, 1280 (xmin, xmax, ymin, ymax)
coord. ref. : +proj=merc +a=6378137 +b=6378137 +lat_ts=0 +lon_0=0 +x_0=0 +y_0=0 +k=1 +units=m +nadgrids=@null +no_defs
data source : C:\Users\me\Documents\traffic\bing\images\mymap.png
names : mymap
values : 0, 255 (min, max)
I'm not entirely sure why it says there are 3 bands when this is just a single band PNG image.