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Remote Sensing Lab exercise #1. Understanding Thermal Images For this project you will work together in a small group using the small thermal scanner. Part 1. Take the temperature of the members of your group using the digital thermometer (thermal scanner). Record these values. DO NOT SHINE THE LASER TARGETING DEVICE INTO ANYONE”S EYES!! Take a standard thermometer and record the temperature of the same individuals. (keep the thermometer out of any orifices!… just tuck it beneath your chin) Are there differences? Explain the difference between radiant temperature and kinetic temperature. Create a correction factor for your radiant temp. and kinetic temp. figures. How does the ‘heat’ of the individuals measured compare with the generally accepted social conventions regarding ‘hot’ individuals? Part 2. The Thermal ‘Still Life’ You are going to create a thermal image of a group of objects using the digital thermometer. The Image will be constructed by recording a value for every square inch of the objects. In order to control this, a simple 1” grid has been constructed. Each group will be responsible for creating at least 1 ‘scan line’, share your data with the other groups to complete the data collection required to make an image. From approximately 6” shoot through each grid cell and record the temperature. A couple of the targets are metal containers; compare the external temperature of the bowl with a reading of the contents, how do these compare? Why? Use your observations to explain the concept of emissivity. Creating a digital image: Initially, you have a grid array with radiant temperatures; the next task is to create an image using an 8 bit digital number. ‘Eight bits’ indicates a binary number of 1X108 possible values. In integer terms the value range for an 8 bit number is 0-255 (256 possible values). 8 bit data are very common in many remote sensing applications. Create a scale for your radiant temperatures with the maximum reading being 255 and the minimum reading being 0. Construct a histogram showing the distribution of DN values for the image. Create 3 versions of the same ‘Image’ where each grid cell (pixel) has the radiant temp. where each grid cell (pixel) has a digital number value and finally interpolate a gray shade image where full black is 0 and full white is 255. Your write up should have the following structure: The purpose of the exercise (in this case to gain insights into thermal imaging and the creation of digital images) The Data and Methods used for the investigation. Your analysis, which will include answers to any questions posed, figures/diagrams as appropriate with a full explanation. This will be the first document in your remote sensing ‘notebook’.
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