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PyQGIS raster image shifted from vector shapefile

.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ margin-bottom:0;
}

0

I previously asked a question about my raster image being larger and shifted over from my vector image here, but now I realize that the raster image is only shifted to the left and up from the vector map (both image and map are defined in decimal degree coordinates). The vector layer is a world shapefile and the raster image is a .png image that is overlain on the shapefile.

Below I have two examples where the raster image is shifted when uploaded on the shapefile in PyQGIS:

The blue and green are part of the vector shapefile (blue being the ocean and green being the land). The purple, white grid, and green contours are part of the raster image. The larger red X represents the set of coordinates that were defined on the vector map. The smaller red X represents the same set of coordinates, but on the raster image. Here is where I can tell that the raster image is shifted compared to the vector map because the red X's represent the same coordinates (i.e. 75.23694W, 39.86N for the second image).

I am wondering how to fix this? Is there anyway to easily correct the raster location to the correct area?

My PyQGIS code to upload the raster image is below:

def addRasterImage1(self):

    x = self.lon0    

    y = self.lat0

    self.layers = []

    fileName = 'Desktop' 



    dir = os.path.dirname(fileName) if fileName is not None else "." #path of the saved raster image

    formats = ["*.%s" % "PNG"]  



    file = myfile_list[k_zt]  #raster image to load onto vector image

    print file

    if file:

        layer = QgsRasterLayer(file, fileName)

        print "layer",layer



        if not layer.isValid():

            return



        # add layer to the registry

        QgsMapLayerRegistry.instance().addMapLayer(layer)



        # # set extent to the extent of layer

        self.canvas.setExtent(layer.extent())                       

        self.layers.insert(0, QgsMapCanvasLayer(layer))



        print "layers number:",len(self.layers)

        self.canvas.setLayerSet(self.layers)

        self.canvas.refresh()

        self.MyWorldLayer(ext = False)

Where self.MyWorldLayer(ext = False) is the vector shapefile map.
Please let me know if you have any suggestions on how to fix this!

python raster pyqgis qgsmapcanvas qgsvectorlayer

share

asked 2 mins ago

user137875user137875

233

add a comment | 

0

I previously asked a question about my raster image being larger and shifted over from my vector image here, but now I realize that the raster image is only shifted to the left and up from the vector map (both image and map are defined in decimal degree coordinates). The vector layer is a world shapefile and the raster image is a .png image that is overlain on the shapefile.

Below I have two examples where the raster image is shifted when uploaded on the shapefile in PyQGIS:

The blue and green are part of the vector shapefile (blue being the ocean and green being the land). The purple, white grid, and green contours are part of the raster image. The larger red X represents the set of coordinates that were defined on the vector map. The smaller red X represents the same set of coordinates, but on the raster image. Here is where I can tell that the raster image is shifted compared to the vector map because the red X's represent the same coordinates (i.e. 75.23694W, 39.86N for the second image).

I am wondering how to fix this? Is there anyway to easily correct the raster location to the correct area?

My PyQGIS code to upload the raster image is below:

def addRasterImage1(self):

    x = self.lon0    

    y = self.lat0

    self.layers = []

    fileName = 'Desktop' 



    dir = os.path.dirname(fileName) if fileName is not None else "." #path of the saved raster image

    formats = ["*.%s" % "PNG"]  



    file = myfile_list[k_zt]  #raster image to load onto vector image

    print file

    if file:

        layer = QgsRasterLayer(file, fileName)

        print "layer",layer



        if not layer.isValid():

            return



        # add layer to the registry

        QgsMapLayerRegistry.instance().addMapLayer(layer)



        # # set extent to the extent of layer

        self.canvas.setExtent(layer.extent())                       

        self.layers.insert(0, QgsMapCanvasLayer(layer))



        print "layers number:",len(self.layers)

        self.canvas.setLayerSet(self.layers)

        self.canvas.refresh()

        self.MyWorldLayer(ext = False)

Where self.MyWorldLayer(ext = False) is the vector shapefile map.
Please let me know if you have any suggestions on how to fix this!

python raster pyqgis qgsmapcanvas qgsvectorlayer

share

asked 2 mins ago

user137875user137875

233

add a comment | 

I previously asked a question about my raster image being larger and shifted over from my vector image here, but now I realize that the raster image is only shifted to the left and up from the vector map (both image and map are defined in decimal degree coordinates). The vector layer is a world shapefile and the raster image is a .png image that is overlain on the shapefile.

Below I have two examples where the raster image is shifted when uploaded on the shapefile in PyQGIS:

The blue and green are part of the vector shapefile (blue being the ocean and green being the land). The purple, white grid, and green contours are part of the raster image. The larger red X represents the set of coordinates that were defined on the vector map. The smaller red X represents the same set of coordinates, but on the raster image. Here is where I can tell that the raster image is shifted compared to the vector map because the red X's represent the same coordinates (i.e. 75.23694W, 39.86N for the second image).

I am wondering how to fix this? Is there anyway to easily correct the raster location to the correct area?

My PyQGIS code to upload the raster image is below:

def addRasterImage1(self):

    x = self.lon0    

    y = self.lat0

    self.layers = []

    fileName = 'Desktop' 



    dir = os.path.dirname(fileName) if fileName is not None else "." #path of the saved raster image

    formats = ["*.%s" % "PNG"]  



    file = myfile_list[k_zt]  #raster image to load onto vector image

    print file

    if file:

        layer = QgsRasterLayer(file, fileName)

        print "layer",layer



        if not layer.isValid():

            return



        # add layer to the registry

        QgsMapLayerRegistry.instance().addMapLayer(layer)



        # # set extent to the extent of layer

        self.canvas.setExtent(layer.extent())                       

        self.layers.insert(0, QgsMapCanvasLayer(layer))



        print "layers number:",len(self.layers)

        self.canvas.setLayerSet(self.layers)

        self.canvas.refresh()

        self.MyWorldLayer(ext = False)

Where self.MyWorldLayer(ext = False) is the vector shapefile map.
Please let me know if you have any suggestions on how to fix this!

python raster pyqgis qgsmapcanvas qgsvectorlayer

share

asked 2 mins ago

user137875user137875

233

def addRasterImage1(self):

    x = self.lon0    

    y = self.lat0

    self.layers = []

    fileName = 'Desktop' 



    dir = os.path.dirname(fileName) if fileName is not None else "." #path of the saved raster image

    formats = ["*.%s" % "PNG"]  



    file = myfile_list[k_zt]  #raster image to load onto vector image

    print file

    if file:

        layer = QgsRasterLayer(file, fileName)

        print "layer",layer



        if not layer.isValid():

            return



        # add layer to the registry

        QgsMapLayerRegistry.instance().addMapLayer(layer)



        # # set extent to the extent of layer

        self.canvas.setExtent(layer.extent())                       

        self.layers.insert(0, QgsMapCanvasLayer(layer))



        print "layers number:",len(self.layers)

        self.canvas.setLayerSet(self.layers)

        self.canvas.refresh()

        self.MyWorldLayer(ext = False)

share

asked 2 mins ago

user137875user137875

233

share

asked 2 mins ago

user137875user137875

233

asked 2 mins ago

user137875user137875

233

asked 2 mins ago

user137875user137875

233