Assignment 5: The Headwaters of the Rio Pecos |
| In this assignment, a map of the watershed containing the headwaters of
the Rio Pecos was created. To do this, three coverages (rivers, reservoirs,
and HUC13) in Arc/Info exchange format (.e00) were imported using the ArcView
Import from Interchange File option in ArcToolbox. The query “HUC”
= 13060001 was used to define the headwaters of the Rio Pecos.
We were asked to determine how to select all parts of the river network in the Rio Pecos basin. It wasn’t possible to do this using Select by Location, because the uppermost segment isn’t “completely within” the watershed polygon. I was able to select all of the rivers by using the Selection by Attributes and ‘Subregion’ = 06. Stream gage data was obtained from http://waterdata.usgs.gov/nm/nwis/sw
for the Pecos Headwaters. Data were downloaded in a tab-separated format,
and then imported into Excel. Cells were formatted so that latitude and
longitude would have two decimal places. The cells with data were then
selected on the Excel workshop and saved as a .dbf file. This file was
then added to ArcMap project. By right-clicking on the table icon, “Display
XY” data could be selected and the gages were then visible on the
map. |
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