Grab It! Graph Digitizer

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Grab It!Guide - Data Types

Linear data
Linear data has a constant scale that applies to the axis. i.e. moving 1 inch in a particular direction always changes the x or y value by a constant amount. This scanned image has linear x and y axes. Click here for generic instructions.
linear.gif (2349 bytes)
Log data
Log data has axes in a logarithmic scale. Moving in a particular direction by 1 inch does not always change the x or y value by a constant, however the change in log(x) or log(y) IS constant. Log axis labels can be scientific (x-axis) or numeric (y-axis), as shown below. Click here for generic instructions.
log.gif (2059 bytes)
Dates are common graph types for stock market charts. Below is a graph showing Dell share prices, as quoted by Yahoo! It has a date-format x-axis, and a log y-axis. Click here for generic instructions.
date.gif (4413 bytes)

Time charts are common for data acquisition, intra-day stock charts and scheduling graphs. Below is a generic candle chart of intra-day option prices. This chart has a time x-axis, and a linear y-axis. Click here for generic instructions.

time.gif (5223 bytes)
Point-to-Point measurements
Point to point measurements are useful for sizing features on pictures. The following picture shows grains inside a superalloy at high magnification. Width and length measurements of the needle shaped grains would be a point-to-point measurement application. A scale bar, or some reference feature is required if exact dimensions are needed.
example3.jpg (47429 bytes)
Angle measurements
Angle measurements can be made on any photo. The image below shows a calibration-test image. Angle measurements do not require scale bars.
angle.gif (1375 bytes)
Special Graph Styles
Click here for instructions on taking data from special graph styles.

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