Update raster.py

Author: robertohuru

raster.py

@@ -56,7 +56,7 @@ def __init__(self, gdal_dataset=None, **kwargs):
             if len(kwargs) == 0:
                 extent = [-180, 180, -90, 90]
                 xres = 1
-                yres = 1
+                yres = -1
                 crs = 4326
                 self.data_type = gdal.GDT_Float32
             else:
@@ -1357,4 +1357,4 @@ def terrain(x, opt="slope"):
     pass
     """gdal.DEMProcessing(destName=output_raster, srcDS=elevation_raster, processing=opt, format="GTiff")
     if os.path.exists(output_raster):
-        return Raster(gdal.Open(output_raster))"""
+        return Raster(gdal.Open(output_raster))"""