Divisão de Observação da Terra e Geoinformática

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geodma [2025/08/21 16:00] – [Load Raster and Apply Segmentation] thalesgeodma [2025/08/21 17:56] (atual) – [Load Raster and Apply Segmentation] thales
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 {{:thales:geodma-2-instalation.mp4?800|}} {{:thales:geodma-2-instalation.mp4?800|}}
  
-==== Quick Tutorial - From Raster to Land Cover Map using GeoDMA ====+===== Quick Tutorial - From Raster to Land Cover Map using GeoDMA =====
  
-===== Load Raster and Apply Segmentation =====+==== Load Raster and Apply Segmentation ====
  
-The first step is to use TerraView software to load and visualize image. We selected the True Color composition for our 4 bands image (Blue, Green, Red, Nir), using bands 2, 1 and 0. +The first step is to use TerraView software to load and visualize image (download [[https://github.com/tkorting/remote-sensing-images/raw/refs/heads/master/pan-2025-03-04.tif| using this link]]). We selected the True Color composition for our 4 bands image (Blue, Green, Red, Nir), using bands 2, 1 and 0. 
  
 We also applied the 2% image stretching to provide a fast visualization with high contrast. With the image on the screen, we selected the Image Segmentation method to produce regions according. We have selected the minimum number of pixels as 25 to avoid very small regions, and defined a similarity threshold of 0.01, based on the minimum euclidean distance of pixels with 4 bands to be considered homogeneous. We also applied the 2% image stretching to provide a fast visualization with high contrast. With the image on the screen, we selected the Image Segmentation method to produce regions according. We have selected the minimum number of pixels as 25 to avoid very small regions, and defined a similarity threshold of 0.01, based on the minimum euclidean distance of pixels with 4 bands to be considered homogeneous.
  
-|{{ :thales:terraview-load-raster-rgb-2p.mp4?400 |1. Load Raster, 2. Define True Color composition, 3. Apply high contrast}} | {{ :thales:terraview-segmentation.mp4?400 |Apply segmentation using Region Growing method}} |+|Loading Raster in TerraView {{ :thales:terraview-load-raster-rgb-2p.mp4?400 |1. Load Raster, 2. Define True Color composition, 3. Apply high contrast}} | Apply image segmentation in TerraView {{ :thales:terraview-segmentation.mp4?400 |Apply segmentation using Region Growing method}} |
  
 ==== Extract Features and Select Samples ==== ==== Extract Features and Select Samples ====
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 Based on the regions obtained by the segmentation, we call GeoDMA Feature Extraction tool that produces a table full of features. **This process can take several minutes** (~15 minutes in this case). We also select samples from the images to train a Decision Tree Algorithm. Based on the regions obtained by the segmentation, we call GeoDMA Feature Extraction tool that produces a table full of features. **This process can take several minutes** (~15 minutes in this case). We also select samples from the images to train a Decision Tree Algorithm.
  
-|{{ :thales:geodma-feature-extraction.mp4?400 |Feature Extraction (slow process)}}|{{ :thales:geodma-sampling.mp4?400 |Sample selection, based on Land Cover classes expected to be present on the image}}|+|Feature Extraction in GeoDMA {{ :thales:geodma-feature-extraction.mp4?400 |Feature Extraction (slow process)}}|Sample Selection in GeoDMA{{ :thales:geodma-sampling.mp4?400 |Sample selection, based on Land Cover classes expected to be present on the image}}|
  
 ==== Classify and Visualize Results ==== ==== Classify and Visualize Results ====
geodma.1755792032.txt.gz · Última modificação: 2025/08/21 16:00 por thales