|USING ADOBE PhotoShop TO
MEASURE EarthKAM IMAGES
Part 2 - Linear Measurements
When visible, rulers appear along the top and left side of the active window. Markers in the ruler display the pointers position when you move it. The numbers on the ruler now reflects km in the image.
Choose View > Show Rulers or Hide Rulers.
Select the measure tool
The measure tool has a miniature ruler icon located as the eight tool down on the left hand side of the standard Adobe PhotoShop Tool Bar. The measure tool calculates the distance between any two points in the work area. When you measure from one point to another, a non-printing line is drawn and the Info palette shows the following information:
| The starting location (X and Y).
The horizontal (W) and vertical (H) distances traveled from the x and y axes.
The total distance traveled (D).
The angle measured relative to the axis (A).
| Optionally set a second measuring line to create a protractor. This lets you measure angles separated from the x and y axes, and view two distances traveled (D1 and D2). Click on the line start-point while holding down the ALT key. The angle between the two base lines is measured. This method could be used to measure a direction compared to the Look Direction angle from the detailed data page.|
All measurements except the angle are calculated in the unit of measure currently set in the Units & Rulers preference dialog box (In this case pixels) but remember that 1 pixel = 1 km.