How to mask a raster using a shapefile?

How to mask a raster using a shapefile?

Using rasterio with fiona, it is simple to open a shapefile, read geometries, and mask out regions of a raster that are outside the polygons defined in the shapefile. This shapefile contains a single polygon, a box near the center of the raster, so in this case, our list of features is one element long.

How to mask netCDF data from shapefile in Python?

You may need to adjust how you grab the transform information if your dataset does not have a ds.geobox attribute (an open data cube query object will have this attribute) How to mask NetCDF time series data from a shapefile in Python?

How to create a geopandas mask from a shapefile?

I think from your code snippet above sf is a geopandas dataframe. If that’s the case, then you need to grab just the polygon you want to apply as the mask (as per sf.iloc [0] above).

How to create a plot with shapefile outlines?

plot_shapefile – creates a basic map plot with the shapefile outlines added shapefile_mask_data – masks your own data against outlines in a shapefile Important note: The shapefile_mask_data function is a powerful function used by many scripts on this page.

How to replace small polygons in rasterio source?

Replace small polygons in source with value of their largest neighbor. Polygons are found for each set of neighboring pixels of the same value. source ( array or dataset object opened in ‘r’ mode or Band or tuple(dataset, bidx)) – Must be of type rasterio.int16, rasterio.int32, rasterio.uint8, rasterio.uint16, or rasterio.float32

What happens if there are no valid shapes in rasterio?

Return an image array with input geometries burned in. Warnings will be raised for any invalid or empty geometries, and an exception will be raised if there are no valid shapes to rasterize. shapes (iterable of ( geometry, value) pairs or iterable over) – geometries.

Where are the polygons in a shapefile?

This shapefile contains a single polygon, a box near the center of the raster, so in this case, our list of features is one element long. Using plot and imshow from matplotlib, we can see the region defined by the shapefile in red overlaid on the original raster.

What does the spatial extent of a shapefile represent?

The spatial extent of a shapefile represents the geographic “edge” or location that is the furthest north, south east and west. Thus is represents the overall geographic coverage of the spatial object. Image Source: Colin Williams, NEON. Now that you have imported the shapefile. Plot the two layers together to ensure the overlap each other.

Can You crop if shapefile does not overlap?

Plot the two layers together to ensure the overlap each other. If the shapefile does not overlap the raster, then you can not use it to crop! The clipping extent overlayed on top of your raster. When you crop the raster, all of the data outside of the clipping extent will be removed.

How to rasterize a shapefile with geopandas?

Both Fiona and GeoPANDAS use shapely geometries so you are in luck there. In this example a generator is used to iterate through the (geometry,value) pairs which were extracted from the GeoDataFrame and joined together using zip (). Make sure you open the out_fn file in w+ mode, because it will have to be used for reading and writing.

Which is the best raster for shapely geometry?

I found a piece of code from rasterio which seems to be able to take a shapely geometry and burn it into a new raster http://tinyurl.com/op49uek You are on the right track and the geopandas GeoDataFrame is a good choice for rasterization over Fiona.

How to integrate vector geographic data with raster files?

You will learn how to integrate vector geographic data with raster files using rasterio and geopandas. Intermediate python knowledge. Basic rasterio and geopandas knowledge. This is a small project project of geographic data exploration. The main tools for this task are: Rasterio and Geopandas.

How to calculate impervious surfaces from spectral imagery?

In the Contents pane, click the Louisville_Neighborhood.tif layer to select it. On the ribbon, click the Imagery tab. In the Analysis group, click Raster Functions. The Raster Functions pane appears. Raster functions apply an operation to a raster image on the fly, meaning that the original data is unchanged and no new dataset is created.

What can be stored in a Shapefile File?

Only the three vector types (points, lines, and polygons) can be stored in shapefiles. These are simple wrapper functions around readOGR and writeOGR (rgdal package). A shapefile should consist of at least four files: .shp (the geometry), .dbf (the attributes), .shx (the index that links the two, and .prj (the coordinate reference system).

Applying the features in the shapefile as a mask on the raster sets all pixels outside of the features to be zero. Since crop=True in this example, the extent of the raster is also set to be the extent of the features in the shapefile.

How to convert mask binary image to polygon format?

@waspinator I modified your code to read a file path of mask binary images, and it worked for me. Thank you very much! @waspinator I was wondering why you would use np.flip on a contour?

How to make shapely shapes in OpenCV visions?

As far as this pre-processing step goes, cv2.convertScaleAbs converts the image to an 8-bit unsigned integer with 1 channel, essentially flattening it and getting it ready to create some polygons (actually MultiPolygon s in this case). With this result: Now let’s let our functions do the real work!

How to extract polygons from a raster file?

I am new to R and using the raster package. I have a problem extracting polygons from an existing raster file. If I use function on the raster it always creates a list with the data. What I really want is to extract another raster file that I can load with ArcGIS again. After reading a bit more I think the crop function is what I really need.

How to extract cells from a mask in ArcGIS?

The output raster containing the cell values extracted from the input raster. This example extracts cells from a raster within a mask defined by an input polygon shapefile feature class. This example extracts cells from a raster within a mask defined by an input polygon shapefile feature class.

How to delete polygons based on a field?

For more information, refer to ArcGIS Help: Eliminate Polygon Part. However, at the Basic and Standard licensing level, the Eliminate Polygon Part tool is not available, use the Dissolve tool instead. The following steps describe how to delete overlapping sections of polygons based on a field using the Dissolve tool:

How to get rid of overlapping polygons in ArcGIS?

For example, attempting to isolate specific polygons from a shapefile containing many overlapping polygons. At the Advanced license level, the Eliminate Polygon Part tool is available. For more information, refer to ArcGIS Help: Eliminate Polygon Part.