utton and click on both links of 3rd St to join them into one. Ensure that the H_DIST of this combined link is 1.00. Using the same process as before, split the section of Coast Highway between 1st St and 3rd St. The split should be located about 1.5 miles from 1st and 0.5 miles from 3rd, just below the location of centroid 4. Then add a line from the split point to about 0.25 miles above the split. Using the info tool, edit this new line so that it contains the same properties as the other centroid connectors. The new node at the end of this link will be assigned an ID by
transcad (ie, 351.) Again using the info tool, change the number of this node to 3. As this node is the centroid, it must be named to correspond with it's zone.
1.2.4 Edit Link Attributes
To change attributes of network links, use the info tool and follow the way you edit H_DIST described above.
1.3 TAZ Updates
The TAZ.* files contain information regarding the traffic analysis zones in Miasma Beach, including demographic data. The zonal information stored in this transcad network is incomplete, you must fill in a few entries. Set TAZ as your working layer, and open the dataview. For zone 2, change the POP (population) value from 0 to 1550. For zone 5, change the EOTH (other employment) value from 0 to 50, and the ETOT (total employment) from 0 to 150. For Zone 6, change the Household Income from 3800 to 38,000.
GIS Concepts
Editing in a GIS
A GIS usually does not let you undo the editing you do. This is because managing geographic information is more complicated than managing just texts and numbers. To prevent users from changing the database accidentally, most G上一页 [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] ... 下一页 >>
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