We apply this method to along-track oversampled scene FRT00021C92 over Gale Crater within Glen Torridon, where the Curiosity rover has traversed the retrieved values are then analyzed along with remote sensing and in-situ observations by Curiosity to characterize surface properties in and around Glen Torridon. We have developed an approach to estimate apparent thermal inertias (ATI) from observations from the Mars Reconnaissance Orbiter's Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) at a much higher spatial resolution than is available from any other orbital data set. Orbital estimates of thermal inertia are especially useful in conjunction with rover-based observations to provide additional constraints on material properties and to interpret the broader region surrounding the traverse. If you use the measure function Analyze › Measure or ^ Ctrl+ M, the results will be spatially calibrated.Thermal inertia is a key summary property describing the thermophysical characteristics of geologic materials. That means calibration is being set the same for all open images. In the info bar at the top of the image, the numbers have spatial units! Notice the (G) in the name bar of both the images. Now you will see that the test image is spatially calibrated.(If not then only the image with the line selection is calibrated. Now turn on the "Global" option by clicking the check box, so all open images will take the same spatial calibration when you click OK.Set the units of the measurement (um, mm, whatever).The tool knows how many pixels long the line you drew was! Set the known distance of the line you drew in the "Know Distance" Field.Use the Line Selection tool to draw a selection line of a known length on the stage micrometer image.Notice that the images are not spatially calibrated, and their scale is reported in the top info bar in pixels, not real spatial units. Open the stage micrometer image, and the uncalibrated test image.We want to measure the distance between the spots and the area of the spots. The same magnification was used to take the image on the right, a stopped spinning disk confocal scan head. Here's an example: The stage micrometer image on the left shows 100 micrometers.
This assumes, of course, that both images are at the same magnification. The process of spatial calibration involves calibrating a single image against known values, then applying that calibration to your uncalibrated image. If that is so, then you need to spatially calibrate the image before you can measure distances and areas in it! If the image is NOT spatially calibrated already then the dimension will be labelled "pixels". You can see that in the info bar at the top of the image, as there will be micro meters or some other spatial unit next to the numbers. If your image data was in a format that contained spatial calibration meta data, and Fiji (maybe using bio-formats) was able to read it, then your image might already be spatially calibrated. Suppose you wish to gather measurements from an image using real spatial units (µm, miles, etc), rather than just in "pixels".
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