These should help with the completion of the map in ArcMap.
This page, on making map layouts, may be helpful: http://courses.washington.edu/gis250/lessons/map_layouts/exercise/index.html
- You don't need to map any drives (those instructions are specific to the
ESRM 250 materials).
- Once you have your coordinates in a text file or Excel spreadsheet in this
form (where the ellipses indicate additional data columns you might want
stored with each
point):
sta,x,y,measured_interior_angle,corrected_interior_angle,...
1,x1,y1,ma1,ca1,...
2,x2,y2,ma2,ca2,...
3,x3,y3,ma3,ca3,...
4,x4,y4,ma4,ca4,...
you
can create an event layer.
To create an event layer see this:
http://courses.washington.edu/gis250/lessons/arcmap_basics/exercise/index.html#add_event_theme
if your data are stored on a USB thumb drive you will probably need to
connect to the drive as shown.
This event layer should draw in the
correct location atop the campus aerial photo.
Once you have created
the event layer you will need to export the event layer to a shapefile or
geodatabase feature class in order to use it in the GIS.
To export the
event layer as a regular GIS data source see this:
http://courses.washington.edu/gis250/lessons/create_f_datasets/exercise/index.html#conv_set_to_shapefile
you
don't need to make a selection as the instructions show, just right click and
then Data > Export Data to create a new shapefile.
- You will need to create a line and polygon data set. See
http://courses.washington.edu/gis250/lessons/create_f_datasets/exercise/index.html#create_new_poly_theme
If
you create geodatabase feature classes, their tabular records will
automatically contain the fields "shape_area" and "shape_length" which will
contain the area (in sq ft) and the length or perimeter (in ft) of each
feature. That way you can get the GIS-processed measurements of the area of
the traversed area and length of each side easily.
It will help to set
the snapping environment to use the point feature vertices, so that when you
create line or polygon features, the vertices of these new features will
"snap" to the existing points.
Also, because we are asking to display
the lines with some measurements, it will help to add fields and calculate
values for the lines (e.g., I have a field called meas_len
that contains the measured lengths of each side. That, with the automatic
shape_length field can be used for labeling the
sides.
I added a field to the polygon table, area_ac
to contain the area in acres, also for display of a label in the center of the
polygon.
- Finally, once you have created the point, line, and polygon data, you will
create two maps. In the first map we are asking for you to display measured
data and in the second, corrected data, or data calculated from the
GIS.
For example, to display the points with labels as I have in the
example (http://gis.washington.edu/phurvitz/courses/esrm304/lectures/2009/Hurvitz/example/images/map1.gif),
the label expression was
[sta] & vbNewLine & round([x],1)
& vbNewLine & round([y],1) & vbNewLine &
[measured_interior_angle]
which translates to "display the station
number, then a return (to display on the next line), then the X value rounded
to 1 decimal place, then another return, then the Y value rounded to 1 decimal
place, then another return, then the measured interior angle." We did not
specifically say to show only 1 decimal place of precision, but it makes the
map less crowded.
This shows how to label points, and labeling the
polygon or lines is about identical:
http://courses.washington.edu/gis250/lessons/arcmap_basics/exercise/index.html#label_cities
Following
what you see in the labeling instructions above, you can click the
"Expression" button to enter similar code in the sample label
expression.
For the sides, an expression like this shows the measured
lengths:
round([meas_len], 1)
and this shows lengths
calculated automatically by the GIS:
round( [SHAPE_Length] ,
1)
and this shows the area of the survey course at the center of
the polygon:
round([area_ac],3) & " ac"