def transCRS(xy, src_prj, trt_prj):
'''
Re-project a 2D array of xy coordinates from one prj file to another
...
Arguments
---------
xy : ndarray
nx2 array with coordinates to be reprojected. First column
is X axis, second is Y axis
src_prj : str
Path to .prj file of the source Coordinate Reference System
(CRS) of `xy`
trt_prj : str
Path to .prj file of the target Coordinate Reference System
(CRS) to reproject `xy`
Returns
-------
xyp : ndarray
nx2 array with reprojected coordinates. First column
is X axis, second is Y axis
'''
orig = osr.SpatialReference()
orig.ImportFromWkt(open(src_prj).read())
target = osr.SpatialReference()
target.ImportFromWkt(open(trt_prj).read())
trCRS = osr.CoordinateTransformation(orig, target)
return np.array(trCRS.TransformPoints(xy))[:, :2]
def get_image_wkt(product):
src = gdal.Open(product)
ulx, xres, xskew, uly, yskew, yres = src.GetGeoTransform()
max_x = ulx + (src.RasterXSize * xres)
min_y = uly + (src.RasterYSize * yres)
min_x = ulx
max_y = uly
source = osr.SpatialReference()
source.ImportFromWkt(src.GetProjection())
target = osr.SpatialReference()
target.ImportFromEPSG(4326)
transform = osr.CoordinateTransformation(source, target)
result_wkt = box(
transform.TransformPoint(min_x, min_y)[0],
transform.TransformPoint(min_x, min_y)[1],
transform.TransformPoint(max_x, max_y)[0],
transform.TransformPoint(max_x, max_y)[1]).wkt
return result_wkt
def transCRS(db, prj_link, lat='lat', lon='lon'):
'''
Re-project 'lon' and 'lat' columns from WGS84 to prj_link and put it in
'x' and 'y' columns
...
Arguments
---------
db : DataFrame
DataFrame with coordinates to be reprojected
prj_link : str
Path to .prj to project lon/lat data
lat : str
Column name in db for lattitude
lon : str
Column name in db for longitude
Returns
-------
db : DataFrame
Original DataFrame to which columns 'x' and 'y' have been
added with projected coordinates
'''
orig = osr.SpatialReference()
orig.SetWellKnownGeogCS("WGS84")
target = osr.SpatialReference()
#See link for this hack
#http://forum.osgearth.org/Proj4-error-No-translation-for-lambert-conformal-conic-to-PROJ-4-format-is-known-td7579032.html
wkt = (open(prj_link).read()).replace('Lambert_Conformal_Conic', \
'Lambert_Conformal_Conic_2SP')
target.ImportFromWkt(wkt)
#target.ImportFromWkt(open(prj_link).read()) #original
trCRS = osr.CoordinateTransformation(orig, target)
prjd_xys = db[['lon', 'lat']].values.tolist()
prjd_xys = np.array(trCRS.TransformPoints(prjd_xys))[:, :2]
db['x'] = prjd_xys[:, 0]
db['y'] = prjd_xys[:, 1]
return db