Symbol Size Minimum mm Legibility Rule Checker
Caller specification screen for symbolSizeMm only; not universal legibility, ADA compliance, print readiness or accessibility certification.
Description
Check a measured map-symbol size against caller-supplied millimeter bounds.
Map-symbol legibility depends on both size and context. This checker records whether a measured symbol size meets a caller-defined millimeter range, without attempting a visual assessment.
When to use this tool
Check a measured map-symbol size against caller-supplied millimeter bounds. Use it when the input measurements and conventions below match the operation you need.
- Prepare symbolSizeMm, callerMinimum, callerMaximum, respecting the measurement basis and boundaries below.
- Compare the worked example with your intended operation before reusing its result.
How to use the tool and how it works
- Enter every field in the input table using the stated units and exact supported selector spelling where applicable.
- Run the tool. Correct input errors before interpreting an output.
- Read the result fields below; use accompanying flags and the stated sign, boundary or model convention when interpreting a number.
After checking that callerMinimum does not exceed callerMaximum, the tool compares symbolSizeMm with both bounds inclusively. A value exactly on either bound returns true.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| symbolSizeMm | Symbol size mm. Millimeters. | Finite number |
| callerMinimum | Caller-supplied lower bound in the same units and measurement basis as symbolSizeMm. | Finite number |
| callerMaximum | Caller-supplied upper bound in the same units and measurement basis as symbolSizeMm. | Finite number |
| Output field | Interpretation |
|---|---|
| result | Object containing the following named result fields. |
| result.withinCallerBounds | Inclusive comparison with the ordered lower and upper bounds supplied by the caller. |
{
"input": {
"symbolSizeMm": 1,
"callerMinimum": 0.5,
"callerMaximum": 5
},
"output": {
"result": {
"withinCallerBounds": true
}
}
}Limitations and assumptions
- The supplied bounds are not authenticated design rules. Shape, crowding, contrast, viewing distance and actual user legibility are not evaluated.
- Every declared field is required and unexpected fields are rejected. Numeric inputs must be finite; input errors are distinct from a valid false result or an explicitly qualified output.
- Extremely large inputs and nonfinite or excessively large outputs are rejected. List positions reported by the tool use zero-based indices unless stated otherwise.
Alternative or Complementary methods
For a map-layout decision, inspect the rendered map at its intended size as well as its numerical dimensions. For classification or coordinate work, retain the chosen boundary and coordinate conventions with the result. Compare the scope of the nearby tools below before substituting one.
References
Similar or alternative tools
- Line Weight Print Reproduction Minimum Checker
Caller specification screen for lineWidthMm only; not universal legibility, ADA compliance, print readiness or accessibility certification.
- proportional symbol radius
Circle radius in millimetres whose area is proportional to value at a specified square-millimetres-per-unit scale.