Equal Interval Class Break Generator
Equal attribute interval boundaries; does not equalize feature counts or map areas.
Description
Divide a numerical range into equally spaced class boundaries.
Equal-interval classification divides a numerical range into bands of the same width. It preserves a direct numerical progression, even when the observations themselves are unevenly distributed.
When to use this tool
Divide a numerical range into equally spaced class boundaries. Use it when the input measurements and conventions below match the operation you need.
- Prepare minimumValue, maximumValue, classes, 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.
For ordered minimumValue and maximumValue and an integer class count from 1 to 128, break j equals minimumValue plus j times the range divided by classes. The returned list has classes plus one entries, including both endpoints.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| minimumValue | Minimum value. | Finite number |
| maximumValue | Maximum value. | Finite number |
| classes | Classes. | Integer; from 1 to 128 inclusive |
| Output field | Interpretation |
|---|---|
| result | Object containing the following named result fields. |
| result.breaks | Breaks list, in the ordering described in the calculation. |
{
"input": {
"minimumValue": -10,
"maximumValue": 10,
"classes": 2
},
"output": {
"result": {
"breaks": [
-10,
0,
10
]
}
}
}Limitations and assumptions
- No observation distribution is examined. Equal minimum and maximum produce repeated boundaries, and outliers can make most observations fall in very few classes.
- 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
- Equal Area Class Break Generator
Cumulative feature-area weighted class upper boundaries; indivisible features and tied values cannot guarantee equal physical areas.
- Bathymetric Depth Contour Interval Selector
Qualified caller-reference registry: actual survey depth range, scale, charting standard and independently reviewed contour interval. Requires independently applicable source/context/date evidence; not an authoritative table, omitted predictive model, diagnosis, permission, safety or compliance determination.