Analyzing Watersheds With GIS - Answer Key Author: Joseph J. Kerski, USGS, jjkerski@usgs.gov, 303-202-4315 1)
[ 2)
[ 2,801,789.8 ] 3)
[ Fourth ] 4)
[ 917,648.1 ] 5)
[
Sort table on field “acres” descending. Could have queried on
“Indian Reservation first , but wasn’t necessary since the desired
data appears near the top of the table ]
6)
[ 5 ] 7)
[ Lower White, Middle
White, Little White, Keya Paha, Middle 8)
[ 5 ] 9)
[ 5 records were selected
in the intersection above and used to create 5 polygons
when converted to a new shapefile ] 10)
[ Middle White ] 11)
[ Little White ] 12)
[
147 rivers and creeks] 13)
[
Most water flows into the
[
[ In the SouthEast of the Study Area,
water flows into the 14)
[ 15)
[ No, since it displays
as a much wider river on the map ] 16)
[ 90 cubic feet per second ] 17)
[ 20 minutes ] 18)
[ They show equal acreage
] 19)
[ The two values are very
different now, and reflect the true acreage. ] 20)
[ Rosebud Indian
Reservation ] 21)
[ Tertiary ( silt,
sandstone, clay ) and Upper
Cretaceous (shale, chalk) ] 22)
[ 17 cities ] 23)
[ Rosebud CDP
with population = 1538 ] 24)
[ 11,781 ] 25)
[ In the table, highlight
field “Pop100”. Bring up Field -->
Statistics ] 26)
[ 2 whole counties ] 27)
[ 8 partial counties ] 28)
[
Rosebud cities ] 29)
[ unit ] 30)
[
Keya Paha ] 31)
[
Little White ] 32)
[
No ] 33)
[ visual examination of
the map after selection of cities from the table ] 34)
[
In the next window, 1)
Select theme to assign data to =
RosebudCities.shp 2)
Select theme
to assign data from = RosebudWatersheds.shp 3)
Finish. ] 35)
[ This operation appended
to each RosebudCities record, the watershed fields for the
watershed that contained that city ] 36)
[ 3 cities ] 37)
[ Little White contains 8
cities ] 38)
[
2.47 km ] 39)
[ Gregory county= 053 ] 40) [ RosebudAgri table ] 41)
[
42)
[There
is a lot of missing data (indicated by value = -99 ) and some duplicate
entries. ] 43)
[Recalculate based on
shape.returnarea again, as above. ] 44)
[ Theme Agriculture.shp
has the same problem since the above table was created from this table ] Layout example:
45) [ Watersheds cut across political boundaries and are key to the health of the region; they are affected by urban areas, climate, agriculture, and other factors. ]
46)
[ GIS can be used to study
watershed areas and their relationships to populated areas,
agriculture, geology, and land ownership.
I
learned
how
to Intersect and clip data themes to a specific shapefile using the
Geoprocessing
Wizard.
]
|
U.S.
Department of the Interior
U.S. Geological Survey Rocky Mountain Mapping Center Maintainer:webmaster@rockyweb.cr.usgs.gov URL:http://rockyweb.cr.usgs.gov /public/outreach/sgu/watershedssdlesson_answers.html Last modified: 3 March 2004 |