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Hello everyone, welcome to the Study Hax Institute of GIS and Remote Sensing. Today, I will discuss a very important topic: how we can easily use the SAM (Segment Anything Model) on our satellite imagery to segment different types of features. This method is extremely useful for quickly obtaining segmentation data for various features. I will show you all the steps in detail so that you can easily do it for any satellite imagery after downloading it and then work with the segmented model.
Step-by-Step Process of Segmenting Satellite Imagery using SAM:
First, identify the satellite imagery you want to use. This can be a drone image, aerial imagery, or any high-resolution satellite imagery like Maxar, Spot, or NAIP imagery. Here, I have a satellite image that I have already uploaded and cropped for my study area.
We will use Google Colab to set up our environment. Open Google Colab, and create a new notebook. Change the runtime to GPU for better performance, and then connect to it.
Here is the setup code to install necessary packages:
!pip install segment_geospatial
!pip install leafmap
Import the required libraries:
import os
import leafmap
from samgeo import SamGeo, show_annotations, download_file, overlay_images
Upload your satellite imagery:
from google.colab import files
uploaded = files.upload()
filepath = list(uploaded.keys())[0]
Visualize the image using Leafmap:
Map = leafmap.Map(center=[30, 0], zoom=2)
Map.add_raster(filepath, name="Satellite Image")
Map
Initialize the SAM model as shown below:
sam = SamGeo(
model_type="vit_b",
sam_checkpoint="sam_vit_b_01ec64.pth",
device="cuda"
)
Generate and visualize the binary mask from the segmentation:
binary_mask = sam.generate(filepath, output="mask.tif", foreground=True, unique=True)
show_annotations(binary_mask, cmap="binary_r")
Visualize the annotated segmentation with colors:
annotations = sam.generate(filepath, output="annotations.tif", foreground=True, unique=True)
show_annotations(annotations, cmap="jet")
Use Leafmap's image comparison:
Map.add_raster(filepath, name="Satellite Image")
Map.add_raster("annotations.tif", name="Annotations")
Map
After generating the segmentations, you can export the features as a shapefile:
download_file("mask.tif", "local_filepath")
## Introduction
In this article, I discussed how to work with the SAM model to segment satellite imagery. With the help of the SAM model, it is easy to segment different objects and features from satellite images, which can be useful for GIS and remote sensing applications.
SAM (Segment Anything Model) is a new artificial intelligence model developed by Meta AI that can cut out any object in any image with a single click. It is highly useful for quickly obtaining segmentation data for various features from satellite imagery.
You can set up the environment using Google Colab. Install the required packages, and initialize the SAM model using sam = SamGeo()
, configuring it with the appropriate model type and checkpoint.
Yes, SAM can work with any high-resolution imagery, including aerial photographs and drone imagery.
You can use Leafmap’s image comparison feature to visually compare the original satellite image with the segmented results.
You can export the segmentation data as a TIFF file and use GIS software like QGIS to convert that into a shapefile for further use.
These steps and tips should help you get started with segmenting satellite imagery using the SAM model effectively. Stay tuned for more insights on remote sensing and GIS applications.
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