ArcGIS Model Builder Inline Variable in Raster Calculator

Build valid inline variable expressions, preview transformed raster values, and generate a ModelBuilder-friendly naming pattern for batch raster analysis workflows.

Inline Variable Raster Calculator Builder

Use this tool to create a sample Raster Calculator expression with ArcGIS ModelBuilder inline variable syntax, estimate output values for sample cells, and generate an output name pattern you can adapt inside your model.

Raster variable name

Inline iterator variable name

Current inline variable value

Raster operation

Constant or threshold value

Output raster prefix

Sample raster cell values, comma-separated

Optional custom expression template

" + constant + ", 1, 0)";
      case "less":
        return 'Con(' + rasterToken + " < " + constant + ", 1, 0)";
      default:
        return rasterToken;
    }
  }

function wpcRenderChart(labels, beforeValues, afterValues) {
    var canvas = document.getElementById("wpc-chart");
    var ctx = canvas.getContext("2d");

if (wpcChartInstance) {
      wpcChartInstance.destroy();
    }

wpcChartInstance = new Chart(ctx, {
      type: "line",
      data: {
        labels: labels,
        datasets: [
          {
            label: "Original values",
            data: beforeValues,
            borderColor: "#2563eb",
            backgroundColor: "rgba(37, 99, 235, 0.12)",
            tension: 0.3,
            fill: false,
            pointRadius: 4,
            pointHoverRadius: 5
          },
          {
            label: "Calculated values",
            data: afterValues,
            borderColor: "#0f172a",
            backgroundColor: "rgba(15, 23, 42, 0.12)",
            tension: 0.3,
            fill: false,
            pointRadius: 4,
            pointHoverRadius: 5
          }
        ]
      },
      options: {
        responsive: true,
        maintainAspectRatio: false,
        plugins: {
          legend: {
            labels: {
              color: "#0f172a"
            }
          },
          tooltip: {
            callbacks: {
              label: function (context) {
                return context.dataset.label + ": " + wpcFormatNumber(context.raw);
              }
            }
          }
        },
        scales: {
          x: {
            ticks: {
              color: "#334155"
            },
            grid: {
              color: "#e2e8f0"
            }
          },
          y: {
            ticks: {
              color: "#334155"
            },
            grid: {
              color: "#e2e8f0"
            }
          }
        }
      }
    });
  }

function wpcCalculate() {
    var rasterVar = document.getElementById("wpc-raster-variable").value.trim() || "InputRaster";
    var inlineVariable = document.getElementById("wpc-inline-variable").value.trim() || "Name";
    var inlineValue = document.getElementById("wpc-inline-value").value.trim() || "sample_raster";
    var operation = document.getElementById("wpc-operation").value;
    var constant = parseFloat(document.getElementById("wpc-constant").value);
    var outputPrefix = document.getElementById("wpc-output-prefix").value.trim() || "calc";
    var sampleText = document.getElementById("wpc-sample-values").value;
    var customTemplate = document.getElementById("wpc-custom-template").value;
    var results = document.getElementById("wpc-results");

if (isNaN(constant)) {
      results.innerHTML = "<div class='wpc-result-block'><div class='wpc-result-title'>Input error</div><p>Please enter a valid constant or threshold value.</p></div>";
      return;
    }

var samples = wpcParseSamples(sampleText);
    if (samples.length === 0) {
      results.innerHTML = "<div class='wpc-result-block'><div class='wpc-result-title'>Input error</div><p>Please enter at least one valid numeric sample value.</p></div>";
      return;
    }

var afterValues = wpcComputeValues(samples, operation, constant);
    var validAfterValues = afterValues.filter(function (num) {
      return !isNaN(num) && isFinite(num);
    });

var outputPattern = outputPrefix + "_%" + inlineVariable + "%";
    var resolvedOutput = outputPrefix + "_" + inlineValue;
    var expression = wpcBuildExpression(rasterVar, operation, constant, customTemplate);

var mean = 0;
    if (validAfterValues.length > 0) {
      mean = validAfterValues.reduce(function (sum, num) {
        return sum + num;
      }, 0) / validAfterValues.length;
    }

var min = validAfterValues.length ? Math.min.apply(null, validAfterValues) : NaN;
    var max = validAfterValues.length ? Math.max.apply(null, validAfterValues) : NaN;

var samplePairs = samples.map(function (before, index) {
      var after = afterValues[index];
      return "<li>" + wpcFormatNumber(before) + " → " + wpcFormatNumber(after) + "</li>";
    }).join("");

results.innerHTML =
      "<div class='wpc-result-block'>" +
        "<div class='wpc-result-title'>Raster Calculator expression</div>" +
        "<span class='wpc-inline-code'>" + expression.replace(/</g, "<").replace(/>/g, ">") + "</span>" +
      "</div>" +
      "<div class='wpc-result-block'>" +
        "<div class='wpc-result-title'>ModelBuilder naming pattern</div>" +
        "<span class='wpc-inline-code'>" + outputPattern + "</span>" +
        "<p><strong>Resolved example output:</strong> " + resolvedOutput + "</p>" +
      "</div>" +
      "<div class='wpc-result-block'>" +
        "<div class='wpc-result-title'>Sample transformation preview</div>" +
        "<ul>" + samplePairs + "</ul>" +
        "<p><strong>Output min:</strong> " + wpcFormatNumber(min) + " | <strong>Output max:</strong> " + wpcFormatNumber(max) + " | <strong>Output mean:</strong> " + wpcFormatNumber(mean) + "</p>" +
      "</div>";

document.getElementById("wpc-kpi-type").textContent = wpcOperationLabel(operation);
    document.getElementById("wpc-kpi-mean").textContent = wpcFormatNumber(mean);
    document.getElementById("wpc-kpi-output").textContent = outputPattern;
    document.getElementById("wpc-kpi-count").textContent = String(samples.length);

var labels = samples.map(function (_, index) {
      return "Cell " + (index + 1);
    });
    wpcRenderChart(labels, samples, afterValues);
  }

function wpcReset() {
    document.getElementById("wpc-raster-variable").value = "InputRaster";
    document.getElementById("wpc-inline-variable").value = "Name";
    document.getElementById("wpc-inline-value").value = "dem_tile_01";
    document.getElementById("wpc-operation").value = "multiply";
    document.getElementById("wpc-constant").value = "1.5";
    document.getElementById("wpc-output-prefix").value = "calc";
    document.getElementById("wpc-sample-values").value = "12, 24, 35, 47, 58, 71";
    document.getElementById("wpc-custom-template").value = "";
    wpcCalculate();
  }

document.getElementById("wpc-calc-btn").addEventListener("click", wpcCalculate);
  document.getElementById("wpc-reset-btn").addEventListener("click", wpcReset);

wpcCalculate();
})();
</script>
		</div>

</article>

</div>

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