The relationship between variables in experiments are often shown using graphs. Before the 20th century, graphs were hand-drawn. The advancement in technology made the presentation of experimental data easier. Graphs can now be generated with a click of a button. The challenge that scientists and researchers faced is to convert the old hand-drawn graphs and charts into digital charts and data. In this activity, I used ratio and proportion to compute the numerical data and convert a certain graph, taken from a 1940 Botany journal, into digital data.
A graph was first selected and photocopied from the vast array of journals and publications in the College of Science Library. The photocopied graph was then digitally scanned in order to convert it into a digital image. After scanning the graph, the image of the graph was then viewed and edited using the Nero PhotoSnap Viewer Essential in order to remove the unwanted parts and to remove the tilt of the image. The edited image was then opened using Microsoft Paint in order to determine the pixel coordinates of the points in the graph. The measured pixel coordinates was then tabulated using the OpenOffice Calc program. The pixel coordinates was then converted into the physical values of the data presented in the graph. The conversion factor used for the x-axis is 2 units/ 70 pixels while a conversion factor of 10 units/ 71 pixels was used for the y-axis. The original, edited and the two converted graphs are presented in the figures below, respectively.
The first two images show the scanned image of the graph. The third image presented shows the XY scatter of the converted data points. The square marks in the third image are the computed value of the data points while the circle marks are the data points of the original graph. The graph shows that the data points presented in the original graph closely match those of the converted graph. The last image shows the converted fit and the original fit of the graph. The blue line represents the converted fit while the black line is the fit of the original graph. The image also show that there is a very close resemblance between the original graph and the converted graph. The data points used in generating the last 2 graphs are shown in the tables below.
The first table shows the data points of the XY scatter while the second table shows the data points of the fit of the graph.
In summary, a hand-drawn graph was successfully converted into a digital graph. The values presented by the original graph was also measured and computed using ratio and proportion.
I will grade myself 10/10 for completing the assigned tasks in the activity and getting a converted graph that closely fits the original graph.
***Raffy's and Gilbert's tips really helped a lot.
A graph was first selected and photocopied from the vast array of journals and publications in the College of Science Library. The photocopied graph was then digitally scanned in order to convert it into a digital image. After scanning the graph, the image of the graph was then viewed and edited using the Nero PhotoSnap Viewer Essential in order to remove the unwanted parts and to remove the tilt of the image. The edited image was then opened using Microsoft Paint in order to determine the pixel coordinates of the points in the graph. The measured pixel coordinates was then tabulated using the OpenOffice Calc program. The pixel coordinates was then converted into the physical values of the data presented in the graph. The conversion factor used for the x-axis is 2 units/ 70 pixels while a conversion factor of 10 units/ 71 pixels was used for the y-axis. The original, edited and the two converted graphs are presented in the figures below, respectively.
The first two images show the scanned image of the graph. The third image presented shows the XY scatter of the converted data points. The square marks in the third image are the computed value of the data points while the circle marks are the data points of the original graph. The graph shows that the data points presented in the original graph closely match those of the converted graph. The last image shows the converted fit and the original fit of the graph. The blue line represents the converted fit while the black line is the fit of the original graph. The image also show that there is a very close resemblance between the original graph and the converted graph. The data points used in generating the last 2 graphs are shown in the tables below.
The first table shows the data points of the XY scatter while the second table shows the data points of the fit of the graph.In summary, a hand-drawn graph was successfully converted into a digital graph. The values presented by the original graph was also measured and computed using ratio and proportion.
I will grade myself 10/10 for completing the assigned tasks in the activity and getting a converted graph that closely fits the original graph.
***Raffy's and Gilbert's tips really helped a lot.
Great Work!
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