Arcedit : editcoverage contlines Arcedit : editfeature labels Arcedit : select box *
I then used the cursor to draw out a box covering the whole area (selecting all the labels ). I then used the delete command to remove them. Next I removed the arcs that provided the boundary of the area. These arcs were necessary to provide polygon closure in the last case but are not actually contour lines. Now that I had the contour arcs only , I saved and quit from arcedit. I then built an arc attribute table for the coverage using the build command.
Arc: build contlines line
Note the use of the line option this time. This option results in ARC-INFO creating arc attribute table (.AAT) and not a polygon attribute table (.PAT). I then went into INFO.
Arc: info INFO EXCHANGE CALL 12/07/1994 10:39:01 INFO 9.42 11/11/86 52.74.63* COPYRIGHT 1986 HENCO SOFTWARE, INC. PROPRIETARY TO HENCO SOFTWARE, INC. US GOVT AGENCIES SEE USAGE RESTRICTIONS IN HELP FILES (HELP RESTRICTIONS) ENTER USER NAME>arc ENTER COMMAND >
I selected the contlines table and looked at the items.
ENTER COMMAND >SELECT CONTLINE.AAT
19 RECORD(S) SELECTED
ENTER COMMAND >ITEMS
DATAFILE NAME: CONTLINE.AAT 07/12/1994
7 ITEMS: STARTING IN POSITION 1
COL ITEM NAME WDTH OPUT TYP N.DEC ALTERNATE NAME
1 FNODE# 4 5 B -
5 TNODE# 4 5 B -
9 LPOLY# 4 5 B -
13 RPOLY# 4 5 B -
17 LENGTH 4 12 F 3
21 CONTLINE# 4 5 B -
25 CONTLINE-ID 4 5 B -
As in the last section, I created a data file to hold the heights so I could merge it with contlines.AAT.
ENTER COMMAND >DEFINE SPOT.DAT
ITEM NAME,WIDTH [,OUTPUT WIDTH] ,TYPE [,DECIMAL PLACES] [,PROT.LEVEL]
1
ITEM NAME>CONTLINE-ID
ITEM WIDTH>4
ITEM OUTPUT WIDTH>5
ITEM TYPE>B
5
ITEM NAME>SPOT
ITEM WIDTH>4
ITEM OUTPUT WIDTH>4
ITEM TYPE>I
9
ITEM NAME>
ENTER COMMAND >Q STOP
Arc: joinitem
Usage: JOINITEM
{LINEAR | ORDERED | LINK}
Arc: joinitem contline.aat spot.dat contline.aat contline-id contline-id
Joining contline.aat and spot.dat to create contline.aat
** Item "CONTLINE-ID" duplicated, Join File version dropped **
Arc:
I then checked that the new item had been added. Notice I had not actually entered any heights into the data file, in fact it was easier to do it interactively in ARCEDIT as will be seen later.
Arc: items contlines.aat
DATAFILE NAME: CONTLINE.AAT 07/12/1994
8 ITEMS: STARTING IN POSITION 1
COL ITEM NAME WDTH OPUT TYP N.DEC ALTERNATE NAME
1 FNODE# 4 5 B -
5 TNODE# 4 5 B -
9 LPOLY# 4 5 B -
13 RPOLY# 4 5 B -
17 LENGTH 4 12 F 3
21 CONTLINE# 4 5 B -
25 CONTLINE-ID 4 5 B -
29 SPOT 4 4 I -
I then entered ARCEDIT and edited the arc features of the contlines coverage.
Arcedit: editcoverage contline The edit coverage is now /SUNGIS3/LANDUSE/GISCOURSE/CONTLINE Arcedit: &stat 9999 WARNING the Map extent is not defined Defaulting the mapextent to BND of /SUNGIS3/LANDUSE/GISCOURSE/CONTLINE Arcedit: drawenvironment all on Arcedit: editfeature arcs 19 element(s) for edit feature ARCS Coverage has no COGO attributes Arcedit: draw
You can update values in ARCEDIT and I used this feature to enter the height data. Initially I updated the spot record of the arcs which made up the 0m contours.
Arcedit: update spot 0 SPOT = 0 1 = Select 2 = Next 3 = Who 4 = Skip 9 = Quit Enter point
Figure 4: Updating the height of one of the 0m arcs.
I moved the cursor over the first arc and entered '1', then moved it over the second arc and entered '1' , there were no more arcs of 0m in altitude so I entered '9' to finish this update. During this process the following messages come up :
POT = 0 1 = Select 2 = Next 3 = Who 4 = Skip 9 = Quit Enter point Arc 2 User-ID: 5 with 19 points SPOT = 0 1 = Select 2 = Next 3 = Who 4 = Skip 9 = Quit Enter point Arc 1 User-ID: 4 with 19 points SPOT = 0 1 = Select 2 = Next 3 = Who 4 = Skip 9 = Quit Enter point
I then repeated the process for each of the heights and finally saved the coverage. The following message appears.
Arcedit: save Saving changes for /SUNGIS3/LANDUSE/GISCOURSE/CONTLINE Saving arcs... ** NOTE ** Only arc attribute(s) updated Reopening arcs... Saving labels... ** NOTE ** Label(s) unchanged Reopening labels... Saving tics... ** NOTE ** Tic(s) unchanged Reopening tics... BND replaced into /SUNGIS3/LANDUSE/GISCOURSE/CONTLINE Saving set tolerances to TOL file... Re-establishing edit feature
I then listed the contents of contlines.aat to check that all the arcs had been updated properly. To do this I used the list command.
Arcedit: list contline.aat
Record FNODE# TNODE# LPOLY# RPOLY# LENGTH CONTLINE# CONTLINE-ID SPOT
1 4 5 0 0 21843.598 1 4 0
2 5 2 0 0 22646.461 2 5 0
3 6 7 0 0 54425.746 3 7 200
4 8 9 0 0 91922.109 4 10 400
5 10 11 0 0 39833.703 5 13 600
6 12 13 0 0 27995.510 6 15 800
7 14 15 0 0 20020.670 7 18 1000
8 17 18 0 0 46015.527 8 23 600
9 19 20 0 0 32066.268 9 25 800
10 21 22 0 0 22696.230 10 28 1000
11 23 24 0 0 10649.475 11 31 1200
12 26 27 0 0 63650.066 12 36 600
13 28 29 0 0 63534.285 13 39 800
14 30 31 0 0 63144.336 14 42 1000
15 32 33 0 0 61143.621 15 45 1200
16 34 35 0 0 60122.773 16 48 1400
17 37 37 0 0 67231.102 17 52 1600
18 38 38 0 0 48862.109 18 53 1800
19 39 39 0 0 20117.861 19 54 200
As you can see it was all in order. If there were any mistakes I could always go back and re-update those arcs.
That completes all the coverages bar the ASCII data file forest.dat . The ASCII file was created by entering in to a text file the values of each cell in the grid. A standard ARC header was added so that ARC-INFO could import the ascii data into an ARC-INFO grid.
Thats it. Simple (NOT!).
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