Difference between revisions of "Demonstrating tools in SAGA GIS to analyze Burned areas from Forest Fires"
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==Downloading Imagery from USGS== |
==Downloading Imagery from USGS== |
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+ | The first thing we will do to start off the tutorial will be finding data to run our analysis on. This tutorials imagery is found through USGS Earth Explorer. To actually download the data you have to make an account which is sound on the top right hand corner of the page, click login and it will bring you to a sign in page. At the Bottom it will ask if you want to Create New Account? This only requires a Username and Password of your choice. Once completed your able to start downloading imagery. |
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[[File:USGS search coordinates.png|400px]] |
[[File:USGS search coordinates.png|400px]] |
Revision as of 08:41, 22 December 2022
Contents
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. Being able to manipulate raster files in many open source software will allow you as a user to to be able to pick and choose what software is better suited for your needs.
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
The first thing we will do to start off the tutorial will be finding data to run our analysis on. This tutorials imagery is found through USGS Earth Explorer. To actually download the data you have to make an account which is sound on the top right hand corner of the page, click login and it will bring you to a sign in page. At the Bottom it will ask if you want to Create New Account? This only requires a Username and Password of your choice. Once completed your able to start downloading imagery.
Converting Files
Downloading the file you will have to also download winzip:
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.
Downloading Files into SAGA
Geoprocessing > Imagery > Landsat > Landsat Import with Options
Mosaicking Two Rasters Together
Mosaic two rasters together for both before and after fire.
Geoprocessing > Grid > Grid Systems > Mosaicking
Fire Extent
Difference of Before and After Fire
Geoprocessing > Grid > Calculus > Grid Difference
Object Based Image Segmentation
Geoprocessing > Imagery > Segmentation > OBIA > Object Based Image Segmentation