Difference between revisions of "Landscape Change Assessment using Unsupervised Image Classification in GRASS GIS"

Revision as of 12:17, 6 December 2019

Purpose

The purpose of this tutorial is:

Introduction to GRASS GIS

Methods

Software Download and Installation

Dataset

Because this tutorial is being written to demonstrate the ability of GRASS GIS to assess changes in landscapes, a dataset has been provided for the user. There are many sources that one can find satellite data for different uses, however a data set is being provided to the user so they may follow along with this tutorial with data that has been analysed previously. This dataset consists of two GeoTiff files acquired using the Earth Observing System (EOS) Landviewer tool. These GeoTiff files contains an image obtained by Landsat 7 on September 7, 2000 and an image obtained by Landsat 8 on September 23, 2017. Both images contain imagery of the same area of interest (AOI) which consists of a 40.04 km² square area centered at 45.03001°N 75.68135°W. This area is located in Kemptville, Ontario, an area which has undergone development since the early 2000s to accommodate for increased population sizes. The population of Kemptville is expected to rise given it's close proximity to Ottawa, which makes it an ideal location for commuters to reside.

Starting GRASS GIS

Importing Landsat Rasters

r.in.gdal [(https://grass.osgeo.org/grass78/manuals/r.in.gdal.html]

d.rgb [1]

Map Swipe

Map Swipe tool

Segmentation

i.segment

Pre-Processing

i.cluster

Unsupervised Classification

i.maxlik

Landscape Change Assessment

Not Covered in this Tutorial

r.smooth.seg - image pre-processing (takes place before segmentation)

Additional Resources

Conclusion

References

Earth Observing System (EOS) Landviewer [2]

GRASS GIS Software [3]

@@ Line 1: / Line 1: @@
 ==Purpose==
+The purpose of this tutorial is:
 ==Introduction to GRASS GIS==
@@ Line 11: / Line 11: @@
-===Data Sourcing===
+===Dataset===
+Because this tutorial is being written to demonstrate the ability of GRASS GIS to assess changes in landscapes, a dataset has been provided for the user. There are many sources that one can find satellite data for different uses, however a data set is being provided to the user so they may follow along with this tutorial with data that has been analysed previously. This dataset consists of two GeoTiff files acquired using the [https://eos.com/lv/ Earth Observing System (EOS) Landviewer tool]. These GeoTiff files contains an image obtained by Landsat 7 on September 7, 2000 and an image obtained by Landsat 8 on September 23, 2017. Both images contain imagery of the same area of interest (AOI) which consists of a 40.04 km² square area centered at 45.03001°N 75.68135°W. This area is located in Kemptville, Ontario, an area which has undergone development since the early 2000s to accommodate for increased population sizes. The population of Kemptville is expected to rise given it's close proximity to Ottawa, which makes it an ideal location for commuters to reside.
-Earth Observing System (EOS) Landviewer [https://eos.com/lv/]
 ===Starting GRASS GIS===
@@ Line 18: / Line 22: @@
 ===Importing Landsat Rasters===
+r.in.gdal [(https://grass.osgeo.org/grass78/manuals/r.in.gdal.html]
+d.rgb [https://grass.osgeo.org/grass78/manuals/d.rgb.html]
-===Not Covered in this Tutorial===
+===Map Swipe===
+[https://grass.osgeo.org/grass78/manuals/wxGUI.mapswipe.html Map Swipe tool]
+===Segmentation===
+i.segment
+===Pre-Processing===
+i.cluster
+===Unsupervised Classification===
+i.maxlik
+===Landscape Change Assessment===
+=== ===
+===Not Covered in this Tutorial===
+r.smooth.seg - image pre-processing (takes place before segmentation)
 ===Additional Resources===