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

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===Dataset===
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===Data Set===
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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.
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Because this tutorial is being written to demonstrate the ability of GRASS GIS to assess changes in landscapes, a data set 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 data set 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, making it an ideal location for commuters to reside, which means that [https://renx.ca/kemptville-building-boom-retail-residential/ further development is also expected].
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{| class="wikitable"
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!colspan="2"|Landscape Change Assessment Data Set
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|colspan="1"|'''Data Information'''
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|colspan="1"|'''Data File'''
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|AOI shapefile for data used in this tutorial
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|[[Media:LT_AOI_Shapefile.shp|AOI Shapefile]]
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|GeoTiff file for raster imagery from September 7, 2000 (Landsat 7)
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|LinkGeoTiff2000
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|GeoTiff file for raster imagery from September 23, 2017 (Landsat 8)
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|LinkGeoTiff2017
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==References==
  
==References==
   
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https://renx.ca/kemptville-building-boom-retail-residential/
   
 
Earth Observing System (EOS) Landviewer [https://eos.com/lv/]
  
Earth Observing System (EOS) Landviewer [https://eos.com/lv/]

Revision as of 13:00, 6 December 2019

Purpose

The purpose of this tutorial is:

Introduction to GRASS GIS

Methods

Software Download and Installation

Data Set

Because this tutorial is being written to demonstrate the ability of GRASS GIS to assess changes in landscapes, a data set 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 data set 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, making it an ideal location for commuters to reside, which means that further development is also expected.

Landscape Change Assessment Data Set
Data Information Data File
AOI shapefile for data used in this tutorial AOI Shapefile
GeoTiff file for raster imagery from September 7, 2000 (Landsat 7) LinkGeoTiff2000
GeoTiff file for raster imagery from September 23, 2017 (Landsat 8) LinkGeoTiff2017


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

https://renx.ca/kemptville-building-boom-retail-residential/

Earth Observing System (EOS) Landviewer [2]

GRASS GIS Software [3]

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