User Manual - pancroma

Since we want to measure the snow pack, we will start by generating itsspectrum. We can do this by successively clicking the cursor on the snowyareas in the band file. Notice that there are areas of highly reflective snow andareas in shadow, as well as areas of thinner coverage. Click on all types thatyou are interested in measuring. You can sample as many as 50 points. Notethat the coordinates of your selection appear in the text boxes and a runningcount is kept of your selections.When you have collected your sample, click ‘OK’. The TOA reflectance form willappear. This is the same form that is described in the previous Section. Asbefore, you must enter the Acquisition Date and Solar Elevation Angle from theLandsat metadata so that TOA reflectances can be computed. When you click‘OK’ on this form, the spectrum will be generated.223