More problems with spTransform
Dear Manuel, What is it about the map that looks wrong? What do you mean it has a "longitud 0" (the projected coordinates do not refer to longitude). Perhaps it is shifted in EW direction? Google (CRTM05) suggests that you need to use a false easting, +x_0=500000. Robert
On Thu, Oct 21, 2010 at 3:50 PM, Manuel Sp?nola <mspinola10 at gmail.com> wrote:
Dear list members,
I know that this is not a problem with the function, but I am trying to work
with CRTM05 (for Costa Rica) with these parameters ("+proj=tmerc +lon_0=-84
+lat_0=0 +k=0.9999 +datum=WGS84") . ?I am trying to project a map in
geographic coordinates to CRTM05 but the projected map doesn't look right,
it has a longitud 0.
corr = readOGR(dsn="C:/ProyectoRespacial/EvalHab_reporte",
layer="corredor05unico") # en coordenadas geogr?ficas OGR data source with driver: ESRI Shapefile Source: "C:/ProyectoRespacial/EvalHab_reporte", layer: "corredor05unico" with 1 features and 4 fields Feature type: wkbPolygon with 2 dimensions
corr.transf = spTransform(corr, CRS("+proj=tmerc +lon_0=-84 +lat_0=0
+k=0.9999 +datum=WGS84")) # para CRTM05
writeOGR(corr.transf,
dsn="C:/ProyectoRespacial/CBSS/Shapefiles_proyectados", layer="corredorCRTM05", driver="ESRI Shapefile") # para escribir el shape
corre = readOGR(dsn="C:/ProyectoRespacial/CBSS/Shapefiles_proyectados",
layer="corredorCRTM05") OGR data source with driver: ESRI Shapefile Source: "C:/ProyectoRespacial/CBSS/Shapefiles_proyectados", layer: "corredorCRTM05" with 1 features and 4 fields Feature type: wkbPolygon with 2 dimensions
proj4string(corre)
[1] " +proj=tmerc +lat_0=0 +lon_0=-84 +k=0.9999 +x_0=0 +y_0=0 +ellps=WGS84 +datum=WGS84 +units=m +no_defs +towgs84=0,0,0" Am I missing some parameter to do the right projection? Best, Manuel ? ? ? ?[[alternative HTML version deleted]]
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