Thanks Alex, but the locations still fall in the sea when i plot them using your recommended Solution. I looked at the sites you proposed and they have other values for lat_1, lat_0, etc..
2016-02-22 11:04 GMT-07:00 Alex M <tech_...@wildintellect.com>: > On 02/22/2016 09:50 AM, Agus Camacho wrote: > > Dear all, > > > > Im trying to overlap these points: > > > https://www.dropbox.com/s/awdclg4cvsdngej/clean%20urosaurus%20records.csv?dl=0 > > > > and a wrld_simpl object: > > library(maptools) > > data(wrld_simpl) > > > > Over this raster layer > > > https://www.dropbox.com/sh/qcw174tgogpnz7s/AAByDc3TeyFe3W4nEqTFix6Oa?dl=0 > > > > This rastr comes from a .nc file without a reference system. The author > of > > that .nc file gave me the following data about the .nc. > > > > The projection is *Lambert conformal conic* projection > > CEN_LAT = 38.0 > > CEN_LON = -100.0 > > TRUELAT1 = 25. > > TRUELAT2 = 45. > > > > However, despite i have gone through many sites in the internet, i cant > > figure it out: > > > > a) if that is all the data i need to set a reference system for my points > > and the wrld_simp object. > > > > b) how to change a typical CRS object with such data > > > > Ex.CRS ("+proj=lcc+lat_0=38.0+lon0_2=-100+ellps=WGS84") > > > > Where do i enter the TRUELAT and CENLAT values? > > Are there any site that explains easily what the fields in the CRS mean > and > > how to change them? > > > > Thanks in advance. > > > > https://github.com/OSGeo/proj.4/wiki/GenParms > https://trac.osgeo.org/proj/wiki/GenParms > > I believe: > +lat_0 = CEN_LAT Latitude of origin > +lat_1 = TRUELAT1 Latitude of first standard parallel > +lat_2 = TRUELAT2 Latitude of second standard parallel > +lon_0 = CEN_LON Central meridian > > proj strings are defined by the proj4 libary. It's website listed above > and the associated mailing lists or gis stackexchange would be the > places to get help on it. > https://lists.osgeo.org/mailman/listinfo/metacrs > > It often helps to browse similar projections on > http://spatialreference.org/ > http://epsg.io/ > > Enjoy, > Alex > > -- Agustín Camacho Guerrero. Doutor em Zoologia. Laboratório de Herpetologia, Departamento de Zoologia, Instituto de Biociências, USP. Rua do Matão, trav. 14, nº 321, Cidade Universitária, São Paulo - SP, CEP: 05508-090, Brasil. [[alternative HTML version deleted]] _______________________________________________ R-sig-Geo mailing list R-sig-Geo@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-geo
