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Contents

Introduction

UW Geospatial Data Analysis
CEE498/CEWA599
David Shean

Overview

This week, we are going to cover raster basics. We will introduce and use gdal and rasterio to process, analyze and visualize Landsat-8 satellite images over Washington state.

Reading and Tutorials

Please review the following material (especially if you have limited GIS or remote sensing experience), and come to lecture/lab with questions on topics that are unclear, so we can discuss together. There is some overlap in content, but different presentation of the essential material, so hopefully one or more will work for you:

Raster basics

• ESRI Documentation (~15 min)

  • https://desktop.arcgis.com/en/arcmap/latest/manage-data/raster-and-images/what-is-raster-data.htm

  • https://desktop.arcgis.com/en/arcmap/latest/manage-data/raster-and-images/cell-size-of-raster-data.htm

  • https://desktop.arcgis.com/en/arcmap/latest/manage-data/raster-and-images/raster-bands.htm

• Data Carpentry Introduction to Raster Data (~15 min)

  • https://datacarpentry.org/organization-geospatial/01-intro-raster-data/index.html

Multispectral Image and Landsat background

• EarthLab Section 5: https://www.earthdatascience.org/courses/use-data-open-source-python/multispectral-remote-sensing/

  • Suggested (can skim/read, no need for interactive):

    • Chapter 7: Introduction to Multispectral Remote Sensing Data in Python

    • Chapter 9: Work with Landsat Remote Sensing Data in Python

    • Chapter 11: Calculate Vegetation Indices in Python

  • Optional:

    • Chapter 8

    • Chapter 10

• https://landsat.gsfc.nasa.gov/landsat-8/landsat-8-overview

Rasterio

• https://rasterio.readthedocs.io/en/latest/quickstart.html

• Automating GIS Processes

  • Reading raster files with Rasterio

  • Visualizing raster layers

  • Masking / clipping raster

  • Raster map algebra

GDAL

• Parts 1, 2 and 4 of Rob Simmons’ “A Gentle Introduction to GDAL”:

  • https://medium.com/planet-stories/a-gentle-introduction-to-gdal-part-1-a3253eb96082

  • https://medium.com/planet-stories/a-gentle-introduction-to-gdal-part-2-map-projections-gdalwarp-e05173bd710a

  • https://medium.com/planet-stories/a-gentle-introduction-to-gdal-part-4-working-with-satellite-data-d3835b5e2971

• Optional

  • https://live.osgeo.org/en/quickstart/gdal_quickstart.html

  • https://trac.osgeo.org/gdal/wiki/UserDocs/RasterProcTutorial

Other resources

• GeoHackWeek: https://geohackweek.github.io/raster/

• EarthLab Section 3: https://www.earthdatascience.org/courses/use-data-open-source-python/intro-raster-data-python/fundamentals-raster-data/

  • Note: The EarthLab material recently migrated from rasterio to rioxarray. We will start with rasterio, then come back to xarray and rioxarray later in the quarter.

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