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Registering and Using Imagery within a GIS - Answer Key Author: Joseph J. Kerski, USGS, jjkerski@usgs.gov, 303-202-4315
1)
[ The image file is evidently not registered ] 2)
[ The angle would cause some distortion of the image ] 3) image
file name
world file name ------------------------------------------------------------------------------- rosebud.tif
rosebud.tfw sheboygan.jpg
sheboygan.jgw southdakota.bil
southdakota.blw
4)
[ no ] 5)
[ -97.26 W 49.43 N ] 6)
[.0107 degrees ] 7)
[ .0087 degrees 8)
[ 742 ] 9)
[ 695 ] 10)
[ no ] 11)
[ the image file is not registered ] 12)
[ In the Atlantic 13)
[ Upper Right hand: -89.60 W 47.92 N ] [
Upper Left hand: -97.21 W 48.93 N ] 14)
LINE1
= [ .0103234 ] LINE2
= [ 0 ]
LINE3
= [ 0 ] LINE4
= [ -.0084748 ] LINE5
= [ -97.24 ] LINE6
= [ 48.94 ] 15)
[ 16)
[ Should be close ] 17)
[ Geographic coordinates ] 18)
[ The image was displaying a little bit lower than the state
outline. It required some adjustments to the latitude and longitude
lines. ] 19)
.01077457122
0
0 -.00871105121 -97.260 49.428 20)
[ no ] 21)
[ The St Francis fire image file is not georegistered ] 22)
[ Visible on the image are some roads and streams ] 23)
[ stfrancisfire.jgw ] 24)
[0.000098
0.0000
0.0000
-0.000077
-101.0655
43.23 ] 25)
[ First it was important to try to get proportions close (distances
between
features. Then the image can be moved up and down to line up with the
vector features ] 26)
The image file covers a larger area ] 27)
[ 415.53 sq km ] 28)
[ 58.3 sq km ] 29)
[ Used the pointer tool to size the graphics ] 30)
[ smoke is visible in the image ]
[ Special camera was used to “color code” water (green) and
also to determine temperature ( warmer areas are in the red
spectrum ] 31)
[ The resolution is much greater in the aerial photos ] 32) [ center - pivot irrigated fields ] 33) [ With a GIS, an aerial view photo alone can be displayed in the correct location and scale on a map by creating an appropriate world file. ] [
With a GIS, the image can be moved and “stretched” by adjusting the values in the image’s World file ] 34)
[ In ArcView, image data and vector data can be displayed together. The
image data can be adjusted to “fit” the vector data ]
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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/imageregistrationlesson_answers.html Last modified: 26 August 2004 |