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\[ \newcommand\si[1]{\mathrm{#1}}\newcommand\SI[2]{#1\,\si{#2}} \newcommand\matr[1]{\mathbf{#1}} \renewcommand{\epsilon}{\varepsilon} \renewcommand{\theta}{\vartheta} \renewcommand{\kappa}{\varkappa} \renewcommand{\rho}{\varrho} % remember my teacher and friend Adalberto! \renewcommand{\phi}{\varphi} \]

GIS data analysis 2

Dr. Huidae Cho
Institute for Environmental and Spatial Analysis...University of North Georgia

1   Reclassification

Reassigns pixel values in raster to simplify the raster.

For example, cells with values = forestry (value 10) should take a new value of 1.

Cells with values not equal to forestry should take a new value of 0.

Creates a newly coded simple raster.

2   Zonal statistics

zonal-statistics.png

Raster GIS filter operations

3   Moving average

moving-average.png

(a) Moving average in vector; (b) Moving average in raster

4   Slope

slope.png

5   Aspect

aspect.png

6   Hillshade

hillshade-1.png

hillshade-2.png

hillshade-3.png

Example of cartographic hillshading techniques

Image source: (a) and (b) from the Institute of Cartography, ETH Zurich, Switzerland, used by permission

7   Solar radiation

solar-radiation.png

Modelling incoming solar radiation in Happy Valley (a–d) representing morning to evening during a winter’s day

8   Line of sight

line-of-sight.png

Ray tracing for visibility analysis

9   Viewshed

viewshed.png

Results of viewshed analyses for single point and linear feature

10   Suitability analysis for a nuclear waste repository

suitability-analysis.png

11   Exercises

Find some sample layers from nc_spm_08_grass7_exercise.gdb.zip.

11.1   Exercise: NLCD reclassification

Keywords: reclassify

Download the NLCD data and reclassify subtly different subclasses of the same class into their parent classes.

11.2   Exercise: DEM reclassification

Keywords: reclassify

Reclassify the elevation raster in nc_spm_08_grass7_exercise.gdb.zip into lower (0–1/3 of the elevation range), medium (1/3–2/3), and higher (2/3–1).

11.3   Exercise: Major NLCD classes within a radius

Keywords: focal statistics

Find major NLCD classes within a 100-meter radius of each cell

11.4   Exercise: Major NLCD classes by census block

Keywords: zonal statistics

Find major NLCD classes by census block in nc_spm_08_grass7_exercise.gdb.zip.

11.5   Exercise: Slope

Keywords: slope

Calculate the slope of the elevation raster in nc_spm_08_grass7_exercise.gdb.zip.

11.6   Exercise: Aspect

Keywords: aspect

Calculate the aspect of the elevation raster in nc_spm_08_grass7_exercise.gdb.zip.

11.7   Exercise: Hillshade

Keywords: aspect

Calculate the aspect of the elevation raster in nc_spm_08_grass7_exercise.gdb.zip.

Overlay the hillshade layer over the elevation layer and adjust its transparency.

12   Exercise: Solar radiation

Keywords: area solar radiation

Model incoming solar radiation (insolation) into the elevation raster in nc_spm_08_grass7_exercise.gdb.zip.

13   Exercise: Line of sight

Keywords: line of sight

Calculate the light of sight on the the elevation raster in nc_spm_08_grass7_exercise.gdb.zip.

Any issues? I have one.

14   Exercise: Viewshed

Keywords: viewshed

Calculate the viewshed on the the elevation raster in nc_spm_08_grass7_exercise.gdb.zip.