Environmental Engineering Reference
In-Depth Information
Fig. 2.17 A screenshot of the process of preparing to export the csv file into a shapefile
for maps in ESRI software. You can begin this process by right clicking on the
name of the imported file “Events” in the “Table of Contents” in the left panel and
choose the Data
Export Data (Fig.
2.17
) as a shape file. After you have exported
the data as a shape file, you will click on the folder icon and select “shapefile” in the
bottom dialog box as the file format. You must be sure that you are saving the file in
the Molera directory and as the correct named file; we used “GPSPoints” as the
shapefile name. After completing this step, you can remove the original .csv file
(by right clicking on it and selecting remove) to clean up the ArcGIS “Table of
Contents” and save your Map Document.
Now, you are ready to plot the survey points, which will also allow you to make
sure there are no data entry errors (e.g., outlier points located far away from the
cluster of survey points). If you observe outlier points, you should check the data
entry to make sure the coordinates did not include a typo. By right clicking the
database file
>
plot xy, the data will be prepared for display on the screen. The
resulting “point file” will be used in the following analyses. You can also bring up
an aerial image, which is available on the website. You should see the points match
the extent of the aerial photo. If you do not, then the projection may be incorrectly
defined. The exported map should appear as in Fig.
2.15
.
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