2DIA_projectDesign - 1 GIS 4037c Digital Image Analysis Dr....

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1 GIS 4037c Digital Image Analysis Dr. Charles Roberts Digital Image Analysis Project Design Considerations Designing a Remote Sensing Project - Identify goals: This is the most important part of the project. The goal must be clear. The non- remote sensing community has no idea what we do, or how we do it. Typically, they think we can: * Turn the satellite "on" and look at the earth at any time. * We can see through walls, underground and underwater with crystal clarity and that we can read the writing on a tennis ball from 500 miles in space. * Make extremely detailed maps of large areas in a few seconds. It is necessary for the image analyst to pin down the definition of the project, or else it will become undo-able and unmanageable. The image analysis must firmly set the limits on what will be done. - Formulate hypothesis: Usually, the analyst designs a question to be answered. This step is important because there are may options in digital image processing, and the analyst must be able to choose the appropriate option for each project. - What GIS or image processing system is appropriate?- In unit 1 we discussed many different systems. But in addition, the considerations are budget, space on the machine or network, the system in which the final product will be utilized, etc. Given the great rift between vector and raster oriented functions, you will need to consider exactly how they plan to use the product, and you will be expected to know more about this than the client you are providing the product for. Remember that you have more raster GISystems training than about 70% of the people in the field of GISystems. - Data Acquisition: The image analyst must consider: * What is needed for analysis- Aerial photographs, topographic maps, SPOT or Landsat or DOP, what date, what time of year, etc. * What is needed for ground truthing- sampling strategy, what information will be gathered, how it will be used
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2 to evaluate the accuracy of the image product, how the site will be visited, when, etc. Approximately 60% of the project man-hour budget should be reserved for ground truthing. * Preprocessing- What preprocessing is done by the image company, and what will be done after image acquisition? - Feature extraction- What bands are necessary for the project, and what ones might be left out to speed up data processing time and lessen data storage demands. - Image Enhancement- What graphic image products are necessary for image classification, and for visual display to groups of people? - Image Classification- What classification routine will be used, and why? This question must precede all others because it has an effect on most of the other questions. - Accuracy Assessment- How will the accuracy of the final classified map be checked? How will the ground truthing information be compared to the classified map? This is also a step that must be worked out prior to making other decisions: it is the second most important consideration next to image classification.
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This note was uploaded on 12/21/2010 for the course GIS 4037c taught by Professor Roberts during the Fall '10 term at FAU.

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2DIA_projectDesign - 1 GIS 4037c Digital Image Analysis Dr....

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