We'll assume that the lowest possible pixel value represents the lowest possible temperature, so a pixel with a value of 0 represents a temperature of -2 degrees Celsius. That means that we can change pixel values to degrees by simply multiplying the pixel value by a constant and adding another constant.
Since only two values are shown, we are going to assume that the relationship between pixel values and degrees Celsius is linear. The minimum temperature is -2 degrees and the maximum temperature is 45 degrees. Note that the units are degrees Celsius, and only two values are shown. What pixel value represents land? What value represents missing data?
In Part 2, you'll learn how to density calibrate an image.
In a spatially calibrated image, distances and areas in pixels are converted to real-world units of measure, like kilometers and square kilometers. In Part 1, you learned how to spatially calibrate an image. September 2008 SST GeoTIFF (TIFF 1020kB May7 10) Right-click (Win) or control-click (Mac) the link below and download it to your Day 3 folder or directory: If you have difficulty downloading the September 2008 SST image file from NEO, download and use this one instead.