GLG410/598--Computers in Geology
Lecture 8: Simple Image processing and getting images into ArcGIS
- Learn about satellite imagery
- Learn about on line processing of imagery
- Use images in ArcMap
- Learn about how geology, topography, and imagery tell us about the earth (applied to Arizona)
Satellite imagery are those images gathered from a satellite platform of the earth.
These images come from a lecture in my Geomorphology course: http://arrowsmith362.asu.edu/Lectures/Lecture7/
We will work with ASTER imagery for this class: http://asterweb.jpl.nasa.gov/
Here is an explanation of the different bands in the ASTER data product: http://agassiz.la.asu.edu/docs/aster-white-paper.html
Online processing of imagery
This Powerpoint file explains the on line processing system that we developed: Explanation_of_IMSservlet.ppt.
Here is our site: http://aspen.asu.edu/website/Geoinformatics/viewer.htm
This tutorial explains how to use it: Tutorial-ASTER_data.htm
Link that explains how to uncompress and extract the image files that you download using Zip Genius
Using the geology and topography data that I gave you last week (GIS_DEMO.zip--hopefully you still have it downloaded on your Z: drive) and at least one set of processed images from the site, perform the following tasks:
- Part I--Geology, topography, and imagery: In a review of the geology and topography (in both your ArcMap and on the web site), choose an area you find geologically interesting
- Process and add your images to your ArcMap project. Make sure to save as a new project. Note that it get the error shown in this image, it is ok. It is just a difference in datum between the ASTER satellite image and the GIS_DEMO project that I set up for you.
- Make a nice map view (in the Layout view (remember the difference between Layout and Data Views: data_vs_layout.gif. Add a scale and a north arrow (Insert scale bar and Insert North arrow Menu choices). Zoom in to the area of interest and by turning the layers on and off, make maps of the imagery (each band combination), the geology, and the topography. Export them as gif or jpeg (experiment with the resolution)--File->Export->save as type. You may save them as PDF if you want higher resolution. Link to these maps from your assignment web site.
- Answer: What is the basic geology of the site? How do you see that the geology is manifest in the topography and imagery? Are the units resistant? Can you see the contacts? Could it have been mapped in more detail?
- Part II--Urbanization changes around Phoenix: In the area around Phoenix, choose and process images from 2000 and 2004.
This assignment is due as an organized set of images and web page linked from your assignments page on Wednesday October 10, 2007 at 5 pm. Don't wait until the last minute to do this one because the server is slow and cannot handle a heavy load!
- Add the processed images to a new ArcMap project (File->New). Make sure to Save it as a new file name.
- Zoom to an area where you note differences between 2000 and 2004. Add a north arrow and a scale in the layout.
- Export them as gif or jpeg (experiment with the resolution)--File->Export->save as type. You may save them as PDF if you want higher resolution. Link to these maps from your assignment web site.
- In the layer control window, move the 2004 image above the 2000. Experiment with transparency of 2004 and see if you can make a nice map showing both images simultaneously. Export your best as a gif or jpeg (experiment with the resolution)--File->Export->save as type. You may save them as PDF if you want higher resolution. Link to this map from your assignment web site.
- Answer: what area did you choose? What kinds of changes in urbanization do you note? Which imagery product shows the changes the best and why? How does the NDVI (measure of green vegetation) show the differences? What do you think the urban growth looks like now? Are there any other landscape changes that you see? How well do the images match geographically (use the measurement tool to measure the distance between common features)?
Web page originally by Prof. Ramón Arrowsmith
GLG410/598 Computers in Geology
Last modified: October 6, 2007