Demonstrating tools in SAGA GIS to analyze Burned areas from Forest Fires

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Introduction

In recent years forest fires have increased globally at a rapid rate destroying many hectares of vegetation, ecosystems and landscapes (Parajuli, 2019). Being able to analyse forest fires in multiple open source applications like SAGA GIS will benefit anyone looking to study the results of forest fires.

Downloading Saga

This tutorial uses the newest version of SAGA GIS, Version 8.4.1 64bit which can be downloaded here: https://sourceforge.net/projects/saga-gis/files/latest/download

Downloading Imagery from USGS

USGS search coordinates.png

USGS date range.png

USGS cloud cover.png

USGS Imagery selection after fire.png

USGS Imagery selection before fire.png

USGS download imagery button.png

USGS download files.png

Converting Files

Downloading the file you will have to also download winzip:

https://www.winzip.com/en/pages/download/winzip/?lang=en&hd=Download%20Zip%20Opener%20Program%20With%20Ease&x-target=ppc&promo=ppc&gclid=CjwKCAiAp7GcBhA0EiwA9U0mtndQCHoDBslB2Ano7laabRDk7K2uevxb9LbHyebSrkqR614vUW11ZxoCUpIQAvD_BwE

It is an extension because windows does not know how to open Tar files.

Once the application opens - find your tar files in your files and then drag them into the window pane. Once in WINZIP select the unzip tab shown below and then click My PC or Cloud to unzip the files to a specified location on your PC.

Unzipping to PC.png


Downloading Files into SAGA

Geoprocessing > Imagery > Landsat > Landsat Import with Options

Landsat Import with options after fire 1.png

Landsat Import with options after fire 2.png

After fire both data sets uploaded.png

Mosaicking Two Rasters Together

Mosaic two rasters together for both before and after fire.

Geoprocessing > Grid > Grid Systems > Mosaicking

Mosaicking B4 moving over.png

Mosaicking renaming.png

Rename Grid.png

Rename Titles after finishing mosaics.png

Before and After fire mosaics.png

Fire Extent

Clipping grids.png

Grid selections.png

Grid selection Okay.png

Click to clip to extent.png

Rename Clipped grid.png

Add new grid to new map.png

After Fire new Composite colouring.png

Rename clipped grid 2.png

Add new grid to after fire.png

Before Fire Final.png

After fire Final.png

Difference of Before and After Fire

Geoprocessing > Grid > Calculus > Grid Difference

Object Based Image Segmentation

Geoprocessing > Imagery > Segmentation > OBIA > Object Based Image Segmentation

First clip of smaller file.png

Change the RBG composite.png

OBAS.png

Segmentation inputs.png

Transparent after.png

Select fire areas.png

Copy the selection to a new shapes layer.png

Shapes in window pane.png

Segment shape layer.png

Shapefile file on raster.png

Calculating Area of Fire

Property selection.png

Area, extent, of shapefile.png

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