The scale factor method applies scale factors to calculate SCAMIN for area, line, and point features using one of the following files, depending on the product:
• assignscamin.xml: ENC and AML products.
• assignEUIENCSCAMIN.xml: European IENC products, based on the IENC Encoding Guide 1.3.1.
• assignUSIENCSCAMIN.xml: US IENC products, based on the IENC Encoding Guide 1.3.1.
These files are located in:
C:\Program Files\CARIS\<application>\<version>\modules\S‑57 Composer\support
The files are mapping files and follow the same structure and syntax as other mapping files.
This is an example from assignscamin.xml:
<Object Acronym="LNDMRK"> |
<Filter> |
<AttributeAcronymIsEqualTo Acronym="SCAMIN" /> |
</Filter> |
<MapObject> |
<SetScaminAttribute ScaleFactor="4" /> |
</MapObject> |
</Object> |
In this example, a scale factor of 4 is used to calculate the SCAMIN value for the LNDMRK (land mark) feature.
The following formula is used:
SCAMIN = (compilation scale ÷ divisor) × scale factor.
For the LNDMRK feature, SCAMIN is calculated as:
(compilation scale ÷ divisor) × 4
The compilation scale can be derived from either the S-57 product or a meta-compilation scale area feature (M_CSCL). If a feature falls within the boundaries of a meta-compilation scale area, the CSCALE attribute overrides the product compilation scale.
If the data set has a scale of 0, SCAMIN is undefined. When the compilation scale is derived from a meta-compilation scale object, the divisor is 1.0. When the compilation scale is derived from the product, the divisor is 2.0.
If a feature overlaps more than one meta-compilation scale area, the scale of the first area is used.
An alternate method of calculating SCAMIN is to use the CSCLMultiplier. The CSCLMultiplier is a user-defined value that overrides the divisor. This method gives you greater control over SCAMIN calculation. For example, to calculate SCAMIN using the product compilation scale without a divisor, you can set CSCLMultiplier to 1.0.
The following formula is used when calculating SCAMIN using the CSCLMultiplier:
SCAMIN = (compilation scale × CSCLMultiplier) × scale factor
The CSCLMultiplier value is not included in any of the product-specific files distributed with S-57 Composer. You must edit the file to add the multiplier.
This example shows the LNDMRK feature with CSCLMultiplier.
<Object Acronym="LNDMRK"> |
<Filter> |
<AttributeAcronymIsEqualTo Acronym="SCAMIN" /> |
</Filter> |
<MapObject> |
<SetScaminAttribute CSCLMultiplier="2.0" ScaleFactor="4" /> |
</MapObject> |
</Object> |
Here CSCLMultiplier is set to 2 and the scale factor is set to 4. For the LNDMRK feature, SCAMIN is calculated as follows:
SCAMIN = (compilation scale × 2.0) × 4
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