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1. From
the Scenario Menu, click on "Constraint Manager". |
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2. Click
on "Upload Constraint" |
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3. To
upload a new constraint, first enter the
name of the constraint. Second, click "Browse" and select
the constraint zip file you want to upload. Third, click
on "Upload Selected Shapefile".
- Rules for the shapefile being uploaded:
- The
shapefile must be in the Geographic NAD83 coordinate
system.
- The
shapefile must be zipped with a program such as WinZip.
- The
zip file should include the .shp, .shx and .dbf for the
shapefile.
- There
must be a field ending in "_CODE" in your DBF file.
For example, if you ware using a wetlands layer as a
constraint,
you
could
name the field WET_CODE. Put a value of "1" in the field
for all applicable constraint polygons.
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4. You will
see a window with a bar showing the progress of your upload.
Once the upload is done, you will see the constraint just
uploaded on the list of constraints. If you have more than
one constraint layer, click upload constraint to upload an
additional constraint. If this is the only constraint you
have, click on "Click Here to Process These Constraints".
In this tutorial, we will be uploading four separate constraint
layers before processing the constraints. |
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5. Follow
the same steps as before to upload the additional constraint. |
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6. You would
repeat steps 3 and 4 for as many constraints as you have
before clicking the link to process the constraints. |
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7. Now that
all of the constraints have been uploaded, click on the link
to process the constraints. |
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8. As the
constraints are processed, you will see this message. The
page will refresh every 10 seconds until the constraints
have finished processing. |
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9. You will
see this page when the constraints have finished processing.
Click on the link to continue. |
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10. Click
on "Edit Constraint Details" to edit the constraint priorities
and percentages. |
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11.
Set the priority and the percent for each constraint.
- The
priority determines the order that constraints are applied
if constraint polygons from separate constraint layers
overlap. This
only applies if the Constraint Method (see step 13) that
is chosen is "Apply Constraints Using Constraint Priority".
- The
percentage represents the constrained percentage (i.e.
for portions of parcels overlapped by the constraint,
what percent of the parcel portion cannot be developed
on)
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12. Now
that the constraint details have been filled out, you must
"synchronize" the constraints with the scenario. Note the red warning message
box near the top of the window.
On this
page, you
also have the option to not
constrain
developed parcels (where DEVELOPED=X).
When
this is checked, parcels overlapped by constraints that
are developed will not be constrained.
Click on
"Synchronize Constraints with Scenario". |
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13. The
red warning message no longer displays. You should now see
the number of acres affected by the constraints under "Acres
Affected". |
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14. There
are three different methods that constraints can be applied
when there is more than one constraint layer:
- Apply
Constraints Using Constraint Priority - The priority
entered on the "Edit Constraint" link determines which
constraint percentage is used when more than one constraint
field is marked as "1" for a given constraint polygon.
For example, say Wetlands and Vernal Pools have polygons
that overlap (and both are marked as "1" in the "_CODE"
field). If Wetlands has a priority of 2, and Vernal Pools
has a priority
of 1, portions of scenario
parcels that fall within the constraint polygon will
be constrained by the percentage entered for Vernal Pools.
- Apply
Constraints Using Max Constraint Percentage - If more
than one constraint field is marked as "1" for a given
constraint polygon, the portions of parcels that fall
within the constraint polygon will be constrained by
whichever constraint has the higher percentage. For example,
say WET_CODE and VER_CODE are marked as "1" for a given
constraint polygon. If WET_CODE has a constraint percentage
of 30%, and VER_CODE has a constraint percentage of 60%,
portions of scenario parcels that fall within the constraint
polygon will be constrained by 60%.
- Apply
Constraints Using Product of Constraint Percentages -
If more than one constraint field is marked as "1" for
a given constraint polygon, the portions of parcels that
fall within the constraint polygon will be constrained
by the 100% minus the product of the two percentages.
For example, say WET_CODE and VER_CODE are marked as "1" for
a given constraint polygon. If WET_CODE has a constraint
percentage of 30%, and VER_CODE has a constraint percentage
of 60%, portions of scenario parcels that fall within
the constraint polygon will be constrained by 82%.
Changing
the "Constraint Method" requires you to click "Save Changes"
and then follow up by clicking "Synchronize Constraints
with Scenario". |
