Remote Sensing Lab exercise _1 by malj


									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

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

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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