Georeferencing
You have an old road file that is georeferenced
(Fig1_georef.jpg – in .zip file). A developer builds a subdivision and gives you
a shape file that is not georeferenced Fig 2_noref.jpg
- in .zip file). You can do a Spatial
Adjustment in ArcMap to allow the use of the new file.
Click here to download the files you need (zipped). Place the files in an
appropriate folder on your zip drive then open ArcGIS and ArcCatalog. Place the
shape files in your ArcMap table of contents (georefed first)
- Click on the Tools pull-down menu and
select Customize.
- Check the box next to Spatial Adjustment
- Add the georefed and noref shape files to a new map
document
Click on Full Extent (the world icon in the main tool bar)
You should now see the shape files as specs in the
lower-left and upper-right corners.
- Begin Editing then zoom into the
lower-left map (noref) and select the New Displacement Link
tool (If you have trouble seeing the data, right-click on the noref file
name in the table of contents to get the context menu and choose
Select All
-- under Selection. Then go to
the Selection pull-down menu (main pull-down menu – top of
user interface) and use Zoom to Selected Features)
- Activate snapping (editor pull-down menu) and click on
a corner of the grid with the displacement link tool.
- Enter Full Extent (world on main tool
bar)
- Zoom to upper-right of the map view to the georefed
map and click the New Displacement Link tool on the
correlative corner
- Repeat until at least four links are made and then
save the links.
- Now go the Spatial
Adjustment pull-down menu, select set adjust data, and make
sure only noref is selected.
- Go to Spatial Adjustment and click on
Adjust.
The files should now overlay.
Export as-is to a .jpg and e-mail it to me at
gnash@egi.utah.edu
Back to Module 1
Back to Main