Fig 1.
The web application, webpic, viewed in a browser window.
Visual elements are labeled according to their associated step number. Currently supported visual elements include lines (here with endpoints marked “1a” and “1b”), points constrained to lines (“2”, “3”), unconstrained points (“4”), and counts (in darker orange). The zoom feature can be seen activated around the cursor.
Table 1.
Types of information that can currently be collected from images using webpic.
Fig 2.
Images used to compare data collection methods.
Specimens were collected from locality number TT92-3 (“Dori’s Tuff”). Specimens from top-left to bottom-right are: T827, T905, T907, T909, and X306.
Fig 3.
Photograph of an example fossil leaf specimen (T905) showing four linear measurements collected using different data collection methods.
These measurements are: a) scale bar, b) leaf length, c) leaf width and d) petiole width.
Fig 4.
Coefficients of variation (CV) obtained using each data collection method across four leaf measurements.
A: Combined CV is shown for each method. Boxes denote interquartile ranges (IQR), whiskers encompass data within 1.5 IQR beyond the first and third quartiles, and points indicate outliers. B: CV values of the four different measurements for each specimen.
Fig 5.
Measurements obtained using the three data collection methods for all five specimens following conversion from pixels to millimeters.
Asterisks indicate significant differences (p < 0.05) in means using Tukey’s HSD test with p-value adjustment.