WeatherValueTimeseriesInterpolation.java

src/main/java/edu/ie3/datamodel/io/factory/timeseries/ValueWithWeight.java

@@ -0,0 +1,16 @@
+/*
+ * © 2021. TU Dortmund University,
+ * Institute of Energy Systems, Energy Efficiency and Energy Economics,
+ * Research group Distribution grid planning and operation
+*/
+package edu.ie3.datamodel.io.factory.timeseries;
+
+import javax.measure.Quantity;
+
+public record ValueWithWeight<V extends Quantity<V>>(Quantity<V> value, long weight) {
+
+  @Override
+  public String toString() {
+    return "ValueWithWeight{" + "value=" + value + ", weight=" + weight + '}';
+  }
+}

src/main/java/edu/ie3/datamodel/io/factory/timeseries/WeatherValueTimeseriesInterpolation.java

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+/*
+ * © 2021. TU Dortmund University,
+ * Institute of Energy Systems, Energy Efficiency and Energy Economics,
+ * Research group Distribution grid planning and operation
+*/
+package edu.ie3.datamodel.io.factory.timeseries;
+
+import edu.ie3.datamodel.models.timeseries.individual.IndividualTimeSeries;
+import edu.ie3.datamodel.models.value.WeatherValue;
+import java.time.ZonedDateTime;
+import java.time.temporal.ChronoUnit;
+import java.util.*;
+import java.util.stream.Collectors;
+import javax.measure.Quantity;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class WeatherValueTimeseriesInterpolation {
+
+  private static final Logger logger =
+      LoggerFactory.getLogger(WeatherValueTimeseriesInterpolation.class);
+
+  public static <V extends Quantity<V>> Quantity<V> interpolate(
+      IndividualTimeSeries<WeatherValue> timeSeries,
+      ZonedDateTime dateTime,
+      String typeString,
+      Quantity<V> defaultValue) {
+    Optional<ValueSet<V>> valueSet = getValueOptions(timeSeries, dateTime, typeString);
+
+    if (valueSet.isPresent()) {
+      ValueSet<V> vs = valueSet.get();
+      long interval = vs.weight1 + vs.weight2;
+
+      Quantity<V> weighted1 = vs.value1.multiply(vs.weight1);
+      Quantity<V> weighted2 = vs.value2.multiply(vs.weight2);
+
+      return weighted1.add(weighted2).divide(interval);
+    } else {
+      logger.warn(
+          "Interpolating value for timestamp {} failed. Using default: {}", dateTime, defaultValue);
+      return defaultValue;
+    }
+  }
+
+  private static <V extends Quantity<V>> Optional<ValueSet<V>> getValueOptions(
+      IndividualTimeSeries<WeatherValue> timeSeries, ZonedDateTime dateTime, String typeString) {
+    if (timeSeries.getEntries().size() < 3) {
+      logger.info(
+          "Not enough entries to interpolate. Need at least 3, got {}",
+          timeSeries.getEntries().size());
+      return Optional.empty();
+    }
+
+    ZonedDateTime intervalStart = dateTime.minusHours(2);
+    ZonedDateTime intervalEnd = dateTime.plusHours(2);
+
+    Optional<ValueWithWeight<V>> previous =
+        getValue(timeSeries, dateTime, intervalStart, dateTime, typeString);
+    Optional<ValueWithWeight<V>> next =
+        getValue(timeSeries, dateTime, dateTime, intervalEnd, typeString);
+
+    if (previous.isPresent() && next.isPresent()) {
+      return Optional.of(
+          new ValueSet<>(
+              previous.get().value(),
+              previous.get().weight(),
+              next.get().value(),
+              next.get().weight()));
+    } else {
+      return Optional.empty();
+    }
+  }
+
+  private static <V extends Quantity<V>> Optional<ValueWithWeight<V>> getValue(
+      IndividualTimeSeries<WeatherValue> timeSeries,
+      ZonedDateTime timestamp,
+      ZonedDateTime intervalStart,
+      ZonedDateTime intervalEnd,
+      String typeString) {
+    List<ValueWithWeight<V>> values =
+        (List<ValueWithWeight<V>>)
+            timeSeries.getEntries().stream()
+                .map(
+                    entry -> {
+                      ZonedDateTime time = entry.getTime();
+                      long weight = Math.abs(ChronoUnit.SECONDS.between(time, timestamp));
+                      if (time.isAfter(intervalStart) && time.isBefore(intervalEnd)) {
+                        return getTypedValue(entry.getValue(), typeString)
+                            .map(v -> new ValueWithWeight<>(v, weight));
+                      }
+                      return Optional.<ValueWithWeight<V>>empty();
+                    })
+                .filter(Optional::isPresent)
+                .map(Optional::get)
+                .sorted(Comparator.comparingLong(ValueWithWeight::weight))
+                .collect(Collectors.toList());
+
+    return values.stream().findFirst();
+  }
+
+  private static <V extends Quantity<V>> Optional<Quantity<V>> getTypedValue(
+      WeatherValue weatherValue, String typeString) {
+    switch (typeString) {
+      case "diffIrr":
+        return (Optional<Quantity<V>>)
+            (Optional<?>) weatherValue.getSolarIrradiance().getDiffuseIrradiance();
+      case "dirIrr":
+        return (Optional<Quantity<V>>)
+            (Optional<?>) weatherValue.getSolarIrradiance().getDirectIrradiance();
+      case "temp":
+        return (Optional<Quantity<V>>) (Optional<?>) weatherValue.getTemperature().getTemperature();
+      case "windVel":
+        return (Optional<Quantity<V>>) (Optional<?>) weatherValue.getWind().getVelocity();
+      default:
+        return Optional.empty();
+    }
+  }
+
+  private static class ValueSet<V extends Quantity<V>> {
+    final Quantity<V> value1;
+    final long weight1;
+    final Quantity<V> value2;
+    final long weight2;
+
+    public ValueSet(Quantity<V> value1, long weight1, Quantity<V> value2, long weight2) {
+      this.value1 = value1;
+      this.weight1 = weight1;
+      this.value2 = value2;
+      this.weight2 = weight2;
+    }
+  }
+}

src/test/groovy/edu/ie3/datamodel/models/timeseries/WeatherValueTimeseriesInterpolationTest.groovy

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+/*
+ * © 2025. TU Dortmund University,
+ * Institute of Energy Systems, Energy Efficiency and Energy Economics,
+ * Research group Distribution grid planning and operation
+ */
+package edu.ie3.datamodel.models.timeseries
+
+import edu.ie3.datamodel.io.factory.timeseries.WeatherValueTimeseriesInterpolation
+
+class WeatherValueTimeseriesInterpolationTest {
+}